ESB ACK packet not received?

Question

Hi.

I am experimenting with using a nRF52832 to communicate with a nRF24L01+. It is almost working, the nRF52 is sending a packed to the nRF24 ok, and the NRF_ESB_EVENT_TX_SUCCESS event is triggered when the device is in range, so it must be at least detecting the ACK packet back to know the message got through ok. If I turn the nRF24 off (which is setup as RX) then the NRF_ESB_EVENT_TX_FAILED event is triggered instead.

However I am struggling to get the NRF_ESB_EVENT_RX_RECEIVED: event to trigger so I can read the ACK packet.

Basically my question is what will cause the NRF_ESB_EVENT_RX_RECEIVED event to trigger rather than the NRF_ESB_EVENT_TX_SUCCESS? Will it only be triggered when in RX mode, and not by an ACK packet. If so where would I read this ACK payload?

Thanks

void nrf_esb_event_handler(nrf_esb_evt_t const * p_event)
{
    nrf_gpio_pin_set(LED_3);
    nrf_gpio_pin_set(LED_4);
    switch (p_event->evt_id)
    {
        case NRF_ESB_EVENT_TX_SUCCESS:
            nrf_gpio_pin_clear(LED_4); //turn on LED
            
            //NRF_LOG_DEBUG("TX SUCCESS EVENT");
            break;
        case NRF_ESB_EVENT_TX_FAILED:
            nrf_gpio_pin_clear(LED_3); //turn on LED
            //NRF_LOG_DEBUG("TX FAILED EVENT");
            (void) nrf_esb_flush_tx();
            (void) nrf_esb_start_tx();
            
            break;
        case NRF_ESB_EVENT_RX_RECEIVED:
            
            //NRF_LOG_DEBUG("RX RECEIVED EVENT");
            while (nrf_esb_read_rx_payload(&rx_payload) == NRF_SUCCESS)
            {
                nrf_gpio_pin_clear(LED_2);
                if (rx_payload.length > 0)
                {
                
                    //NRF_LOG_DEBUG("RX RECEIVED PAYLOAD");
                }
            }
            break;
        
    }
    NRF_GPIO->OUTCLR = 0xFUL << 12;
    NRF_GPIO->OUTSET = (p_event->tx_attempts & 0x0F) << 12;
}

Håkon Alseth · Accepted Answer

Hi, Just wondering, if it was working would both the NRF_ESB_EVENT_TX_SUCCESS and the NRF_ESB_EVENT_RX_RECEIVED events be triggered? You'll see both. I tried to replicate your scenario, and since the "length" field is disregarded if you use a static length in nRF24L (nRF24L01+ datasheet, chapter 7.3.3.1), you have to hard-code everything to 32 bytes. Here's a rev2 that does this: Fullscreen nrf_esb_statick_ack_32b_rev2.c Download /** * Copyright (c) 2016 - 2018, Nordic Semiconductor ASA * * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * 2. Redistributions in binary form, except as embedded into a Nordic * Semiconductor ASA integrated circuit in a product or a software update for * such product, must reproduce the above copyright notice, this list of * conditions and the following disclaimer in the documentation and/or other * materials provided with the distribution. * * 3. Neither the name of Nordic Semiconductor ASA nor the names of its * contributors may be used to endorse or promote products derived from this * software without specific prior written permission. * * 4. This software, with or without modification, must only be used with a * Nordic Semiconductor ASA integrated circuit. * * 5. Any software provided in binary form under this license must not be reverse * engineered, decompiled, modified and/or disassembled. * * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ #include "nrf_error.h" #include "nrf_esb.h" #include "nrf_esb_error_codes.h" #include "nrf_gpio.h" #include #include #include "sdk_common.h" #include "sdk_macros.h" #include "app_util.h" #include "nrf_log.h" #include "nrf_delay.h" #define ALWAYS_32B_ACK #define BIT_MASK_UINT_8(x) (0xFF >> (8 - (x))) #define NRF_ESB_PIPE_COUNT 8 // Constant parameters #define RX_WAIT_FOR_ACK_TIMEOUT_US_2MBPS (48) /**< 2 Mb RX wait for acknowledgment time-out value. Smallest reliable value - 43. */ #define RX_WAIT_FOR_ACK_TIMEOUT_US_1MBPS (64) /**< 1 Mb RX wait for acknowledgment time-out value. Smallest reliable value - 59. */ #define RX_WAIT_FOR_ACK_TIMEOUT_US_250KBPS (250) /**< 250 Kb RX wait for acknowledgment time-out value. */ #define RX_WAIT_FOR_ACK_TIMEOUT_US_1MBPS_BLE (73) /**< 1 Mb RX wait for acknowledgment time-out (combined with BLE). Smallest reliable value - 68.*/ // Interrupt flags #define NRF_ESB_INT_TX_SUCCESS_MSK 0x01 /**< Interrupt mask value for TX success. */ #define NRF_ESB_INT_TX_FAILED_MSK 0x02 /**< Interrupt mask value for TX failure. */ #define NRF_ESB_INT_RX_DATA_RECEIVED_MSK 0x04 /**< Interrupt mask value for RX_DR. */ #define NRF_ESB_PID_RESET_VALUE 0xFF /**< Invalid PID value which is guaranteed to not collide with any valid PID value. */ #define NRF_ESB_PID_MAX 3 /**< Maximum value for PID. */ #define NRF_ESB_CRC_RESET_VALUE 0xFFFF /**< CRC reset value. */ // Internal Enhanced ShockBurst module state. typedef enum { NRF_ESB_STATE_IDLE, /**< Module idle. */ NRF_ESB_STATE_PTX_TX, /**< Module transmitting without acknowledgment. */ NRF_ESB_STATE_PTX_TX_ACK, /**< Module transmitting with acknowledgment. */ NRF_ESB_STATE_PTX_RX_ACK, /**< Module transmitting with acknowledgment and reception of payload with the acknowledgment response. */ NRF_ESB_STATE_PRX, /**< Module receiving packets without acknowledgment. */ NRF_ESB_STATE_PRX_SEND_ACK, /**< Module transmitting acknowledgment in RX mode. */ } nrf_esb_mainstate_t; #define DISABLE_RF_IRQ() NVIC_DisableIRQ(RADIO_IRQn) #define ENABLE_RF_IRQ() NVIC_EnableIRQ(RADIO_IRQn) #define _RADIO_SHORTS_COMMON ( RADIO_SHORTS_READY_START_Msk | RADIO_SHORTS_END_DISABLE_Msk | \ RADIO_SHORTS_ADDRESS_RSSISTART_Msk | RADIO_SHORTS_DISABLED_RSSISTOP_Msk ) #define VERIFY_PAYLOAD_LENGTH(p) \ do \ { \ if (p->length == 0 || \ p->length > NRF_ESB_MAX_PAYLOAD_LENGTH || \ (m_config_local.protocol == NRF_ESB_PROTOCOL_ESB && \ p->length > m_config_local.payload_length)) \ { \ return NRF_ERROR_INVALID_LENGTH; \ } \ }while (0) /* @brief Structure holding pipe info PID and CRC and acknowledgment payload. */ typedef struct { uint16_t crc; /**< CRC value of the last received packet (Used to detect retransmits). */ uint8_t pid; /**< Packet ID of the last received packet (Used to detect retransmits). */ bool ack_payload; /**< Flag indicating the state of the transmission of acknowledgment payloads. */ } pipe_info_t; /* @brief First-in, first-out queue of payloads to be transmitted. */ typedef struct { nrf_esb_payload_t * p_payload[NRF_ESB_TX_FIFO_SIZE]; /**< Pointer to the actual queue. */ uint32_t entry_point; /**< Current start of queue. */ uint32_t exit_point; /**< Current end of queue. */ uint32_t count; /**< Current number of elements in the queue. */ } nrf_esb_payload_tx_fifo_t; /* @brief First-in, first-out queue of received payloads. */ typedef struct { nrf_esb_payload_t * p_payload[NRF_ESB_RX_FIFO_SIZE]; /**< Pointer to the actual queue. */ uint32_t entry_point; /**< Current start of queue. */ uint32_t exit_point; /**< Current end of queue. */ uint32_t count; /**< Current number of elements in the queue. */ } nrf_esb_payload_rx_fifo_t; /**@brief Enhanced ShockBurst address. * * Enhanced ShockBurst addresses consist of a base address and a prefix * that is unique for each pipe. See @ref esb_addressing in the ESB user * guide for more information. */ typedef struct { uint8_t base_addr_p0[4]; /**< Base address for pipe 0 encoded in big endian. */ uint8_t base_addr_p1[4]; /**< Base address for pipe 1-7 encoded in big endian. */ uint8_t pipe_prefixes[8]; /**< Address prefix for pipe 0 to 7. */ uint8_t num_pipes; /**< Number of pipes available. */ uint8_t addr_length; /**< Length of the address including the prefix. */ uint8_t rx_pipes_enabled; /**< Bitfield for enabled pipes. */ uint8_t rf_channel; /**< Channel to use (must be between 0 and 100). */ } nrf_esb_address_t; // Module state static bool m_esb_initialized = false; static nrf_esb_mainstate_t m_nrf_esb_mainstate = NRF_ESB_STATE_IDLE; static nrf_esb_payload_t * mp_current_payload; static nrf_esb_event_handler_t m_event_handler; // Address parameters __ALIGN(4) static nrf_esb_address_t m_esb_addr = NRF_ESB_ADDR_DEFAULT; // RF parameters static nrf_esb_config_t m_config_local; // TX FIFO static nrf_esb_payload_t m_tx_fifo_payload[NRF_ESB_TX_FIFO_SIZE]; static nrf_esb_payload_tx_fifo_t m_tx_fifo; // RX FIFO static nrf_esb_payload_t m_rx_fifo_payload[NRF_ESB_RX_FIFO_SIZE]; static nrf_esb_payload_rx_fifo_t m_rx_fifo; // Payload buffers static uint8_t m_tx_payload_buffer[NRF_ESB_MAX_PAYLOAD_LENGTH + 2]; static uint8_t m_rx_payload_buffer[NRF_ESB_MAX_PAYLOAD_LENGTH + 2]; // Run time variables static volatile uint32_t m_interrupt_flags = 0; static uint8_t m_pids[NRF_ESB_PIPE_COUNT]; static pipe_info_t m_rx_pipe_info[NRF_ESB_PIPE_COUNT]; static volatile uint32_t m_retransmits_remaining; static volatile uint32_t m_last_tx_attempts; static volatile uint32_t m_wait_for_ack_timeout_us; // nRF52 address workaround enable #ifdef NRF52 static bool m_address_hang_fix_enable = true; #endif static uint32_t m_radio_shorts_common = _RADIO_SHORTS_COMMON; // These function pointers are changed dynamically, depending on protocol configuration and state. static void (*on_radio_disabled)(void) = 0; static void (*on_radio_end)(void) = 0; static void (*update_rf_payload_format)(uint32_t payload_length) = 0; // The following functions are assigned to the function pointers above. static void on_radio_disabled_tx_noack(void); static void on_radio_disabled_tx(void); static void on_radio_disabled_tx_wait_for_ack(void); static void on_radio_disabled_rx(void); static void on_radio_disabled_rx_ack(void); #define NRF_ESB_ADDR_UPDATE_MASK_BASE0 (1 << 0) /*< Mask value to signal updating BASE0 radio address. */ #define NRF_ESB_ADDR_UPDATE_MASK_BASE1 (1 << 1) /*< Mask value to signal updating BASE1 radio address. */ #define NRF_ESB_ADDR_UPDATE_MASK_PREFIX (1 << 2) /*< Mask value to signal updating radio prefixes. */ // Function to do bytewise bit-swap on an unsigned 32-bit value static uint32_t bytewise_bit_swap(uint8_t const * p_inp) { uint32_t inp = (*(uint32_t*)p_inp); #if __CORTEX_M == (0x04U) return __REV((uint32_t)__RBIT(inp)); //lint -esym(628, __rev) -esym(526, __rev) -esym(628, __rbit) -esym(526, __rbit) */ #else inp = (inp & 0xF0F0F0F0) >> 4 | (inp & 0x0F0F0F0F) << 4; inp = (inp & 0xCCCCCCCC) >> 2 | (inp & 0x33333333) << 2; inp = (inp & 0xAAAAAAAA) >> 1 | (inp & 0x55555555) << 1; return inp; #endif } // Internal function to convert base addresses from nRF24L type addressing to nRF51 type addressing static uint32_t addr_conv(uint8_t const* p_addr) { return __REV(bytewise_bit_swap(p_addr)); //lint -esym(628, __rev) -esym(526, __rev) */ } static ret_code_t apply_address_workarounds() { #ifdef NRF52 // Set up radio parameters. NRF_RADIO->MODECNF0 = (NRF_RADIO->MODECNF0 & ~RADIO_MODECNF0_RU_Msk) | RADIO_MODECNF0_RU_Default << RADIO_MODECNF0_RU_Pos; // Workaround for nRF52832 Rev 1 Errata 102 and nRF52832 Rev 1 Errata 106. This will reduce sensitivity by 3dB. *((volatile uint32_t *)0x40001774) = (*((volatile uint32_t *)0x40001774) & 0xFFFFFFFE) | 0x01000000; #endif return NRF_SUCCESS; } static void update_rf_payload_format_esb_dpl(uint32_t payload_length) { #if (NRF_ESB_MAX_PAYLOAD_LENGTH <= 32) // Using 6 bits for length NRF_RADIO->PCNF0 = (0 << RADIO_PCNF0_S0LEN_Pos) | (6 << RADIO_PCNF0_LFLEN_Pos) | (3 << RADIO_PCNF0_S1LEN_Pos) ; #else // Using 8 bits for length NRF_RADIO->PCNF0 = (0 << RADIO_PCNF0_S0LEN_Pos) | (8 << RADIO_PCNF0_LFLEN_Pos) | (3 << RADIO_PCNF0_S1LEN_Pos) ; #endif NRF_RADIO->PCNF1 = (RADIO_PCNF1_WHITEEN_Disabled << RADIO_PCNF1_WHITEEN_Pos) | (RADIO_PCNF1_ENDIAN_Big << RADIO_PCNF1_ENDIAN_Pos) | ((m_esb_addr.addr_length - 1) << RADIO_PCNF1_BALEN_Pos) | (0 << RADIO_PCNF1_STATLEN_Pos) | (NRF_ESB_MAX_PAYLOAD_LENGTH << RADIO_PCNF1_MAXLEN_Pos); } static void update_rf_payload_format_esb(uint32_t payload_length) { NRF_RADIO->PCNF0 = (1 << RADIO_PCNF0_S0LEN_Pos) | (0 << RADIO_PCNF0_LFLEN_Pos) | (1 << RADIO_PCNF0_S1LEN_Pos); NRF_RADIO->PCNF1 = (RADIO_PCNF1_WHITEEN_Disabled << RADIO_PCNF1_WHITEEN_Pos) | (RADIO_PCNF1_ENDIAN_Big << RADIO_PCNF1_ENDIAN_Pos) | ((m_esb_addr.addr_length - 1) << RADIO_PCNF1_BALEN_Pos) | (payload_length << RADIO_PCNF1_STATLEN_Pos) | (payload_length << RADIO_PCNF1_MAXLEN_Pos); } static void update_radio_addresses(uint8_t update_mask) { if ((update_mask & NRF_ESB_ADDR_UPDATE_MASK_BASE0) != 0) { NRF_RADIO->BASE0 = addr_conv(m_esb_addr.base_addr_p0); } if ((update_mask & NRF_ESB_ADDR_UPDATE_MASK_BASE1) != 0) { NRF_RADIO->BASE1 = addr_conv(m_esb_addr.base_addr_p1); } if ((update_mask & NRF_ESB_ADDR_UPDATE_MASK_PREFIX) != 0) { NRF_RADIO->PREFIX0 = bytewise_bit_swap(&m_esb_addr.pipe_prefixes[0]); NRF_RADIO->PREFIX1 = bytewise_bit_swap(&m_esb_addr.pipe_prefixes[4]); } } static void update_radio_tx_power() { NRF_RADIO->TXPOWER = m_config_local.tx_output_power << RADIO_TXPOWER_TXPOWER_Pos; } static bool update_radio_bitrate() { NRF_RADIO->MODE = m_config_local.bitrate << RADIO_MODE_MODE_Pos; switch (m_config_local.bitrate) { case NRF_ESB_BITRATE_2MBPS: #ifdef NRF52 case NRF_ESB_BITRATE_2MBPS_BLE: #endif m_wait_for_ack_timeout_us = RX_WAIT_FOR_ACK_TIMEOUT_US_2MBPS; break; case NRF_ESB_BITRATE_1MBPS: m_wait_for_ack_timeout_us = RX_WAIT_FOR_ACK_TIMEOUT_US_1MBPS; break; #ifdef NRF51 case NRF_ESB_BITRATE_250KBPS: m_wait_for_ack_timeout_us = RX_WAIT_FOR_ACK_TIMEOUT_US_250KBPS; break; #endif case NRF_ESB_BITRATE_1MBPS_BLE: m_wait_for_ack_timeout_us = RX_WAIT_FOR_ACK_TIMEOUT_US_1MBPS_BLE; break; default: // Should not be reached return false; } return true; } static bool update_radio_protocol() { switch (m_config_local.protocol) { case NRF_ESB_PROTOCOL_ESB_DPL: update_rf_payload_format = update_rf_payload_format_esb_dpl; break; case NRF_ESB_PROTOCOL_ESB: update_rf_payload_format = update_rf_payload_format_esb; break; default: // Should not be reached return false; } return true; } static bool update_radio_crc() { switch(m_config_local.crc) { case NRF_ESB_CRC_16BIT: NRF_RADIO->CRCINIT = 0xFFFFUL; // Initial value NRF_RADIO->CRCPOLY = 0x11021UL; // CRC poly: x^16+x^12^x^5+1 break; case NRF_ESB_CRC_8BIT: NRF_RADIO->CRCINIT = 0xFFUL; // Initial value NRF_RADIO->CRCPOLY = 0x107UL; // CRC poly: x^8+x^2^x^1+1 break; case NRF_ESB_CRC_OFF: break; default: return false; } NRF_RADIO->CRCCNF = m_config_local.crc << RADIO_CRCCNF_LEN_Pos; return true; } static bool update_radio_parameters() { bool params_valid = true; update_radio_tx_power(); params_valid &= update_radio_bitrate(); params_valid &= update_radio_protocol(); params_valid &= update_radio_crc(); update_rf_payload_format(m_config_local.payload_length); params_valid &= (m_config_local.retransmit_delay >= NRF_ESB_RETRANSMIT_DELAY_MIN); return params_valid; } static void reset_fifos() { m_tx_fifo.entry_point = 0; m_tx_fifo.exit_point = 0; m_tx_fifo.count = 0; m_rx_fifo.entry_point = 0; m_rx_fifo.exit_point = 0; m_rx_fifo.count = 0; } static void initialize_fifos() { reset_fifos(); for (int i = 0; i < NRF_ESB_TX_FIFO_SIZE; i++) { m_tx_fifo.p_payload[i] = &m_tx_fifo_payload[i]; } for (int i = 0; i < NRF_ESB_RX_FIFO_SIZE; i++) { m_rx_fifo.p_payload[i] = &m_rx_fifo_payload[i]; } } static void tx_fifo_remove_last() { if (m_tx_fifo.count > 0) { DISABLE_RF_IRQ(); m_tx_fifo.count--; if (++m_tx_fifo.exit_point >= NRF_ESB_TX_FIFO_SIZE) { m_tx_fifo.exit_point = 0; } ENABLE_RF_IRQ(); } } /** @brief Function to push the content of the rx_buffer to the RX FIFO. * * The module will point the register NRF_RADIO->PACKETPTR to a buffer for receiving packets. * After receiving a packet the module will call this function to copy the received data to * the RX FIFO. * * @param pipe Pipe number to set for the packet. * @param pid Packet ID. * * @retval true Operation successful. * @retval false Operation failed. */ static bool rx_fifo_push_rfbuf(uint8_t pipe, uint8_t pid) { if (m_rx_fifo.count < NRF_ESB_RX_FIFO_SIZE) { if (m_config_local.protocol == NRF_ESB_PROTOCOL_ESB_DPL) { if (m_rx_payload_buffer[0] > NRF_ESB_MAX_PAYLOAD_LENGTH) { return false; } m_rx_fifo.p_payload[m_rx_fifo.entry_point]->length = m_rx_payload_buffer[0]; } else if (m_config_local.mode == NRF_ESB_MODE_PTX) { // Received packet is an acknowledgment #ifdef ALWAYS_32B_ACK m_rx_fifo.p_payload[m_rx_fifo.entry_point]->length = 32; #else m_rx_fifo.p_payload[m_rx_fifo.entry_point]->length = 0; #endif } else { m_rx_fifo.p_payload[m_rx_fifo.entry_point]->length = m_config_local.payload_length; } memcpy(m_rx_fifo.p_payload[m_rx_fifo.entry_point]->data, &m_rx_payload_buffer[2], m_rx_fifo.p_payload[m_rx_fifo.entry_point]->length); m_rx_fifo.p_payload[m_rx_fifo.entry_point]->pipe = pipe; m_rx_fifo.p_payload[m_rx_fifo.entry_point]->rssi = NRF_RADIO->RSSISAMPLE; m_rx_fifo.p_payload[m_rx_fifo.entry_point]->pid = pid; m_rx_fifo.p_payload[m_rx_fifo.entry_point]->noack = !(m_rx_payload_buffer[1] & 0x01); if (++m_rx_fifo.entry_point >= NRF_ESB_RX_FIFO_SIZE) { m_rx_fifo.entry_point = 0; } m_rx_fifo.count++; return true; } return false; } static void sys_timer_init() { // Configure the system timer with a 1 MHz base frequency NRF_ESB_SYS_TIMER->PRESCALER = 4; NRF_ESB_SYS_TIMER->BITMODE = TIMER_BITMODE_BITMODE_16Bit; NRF_ESB_SYS_TIMER->SHORTS = TIMER_SHORTS_COMPARE1_CLEAR_Msk | TIMER_SHORTS_COMPARE1_STOP_Msk; } static void ppi_init() { NRF_PPI->CH[NRF_ESB_PPI_TIMER_START].EEP = (uint32_t)&NRF_RADIO->EVENTS_READY; NRF_PPI->CH[NRF_ESB_PPI_TIMER_START].TEP = (uint32_t)&NRF_ESB_SYS_TIMER->TASKS_START; NRF_PPI->CH[NRF_ESB_PPI_TIMER_STOP].EEP = (uint32_t)&NRF_RADIO->EVENTS_ADDRESS; NRF_PPI->CH[NRF_ESB_PPI_TIMER_STOP].TEP = (uint32_t)&NRF_ESB_SYS_TIMER->TASKS_STOP; NRF_PPI->CH[NRF_ESB_PPI_RX_TIMEOUT].EEP = (uint32_t)&NRF_ESB_SYS_TIMER->EVENTS_COMPARE[0]; NRF_PPI->CH[NRF_ESB_PPI_RX_TIMEOUT].TEP = (uint32_t)&NRF_RADIO->TASKS_DISABLE; NRF_PPI->CH[NRF_ESB_PPI_TX_START].EEP = (uint32_t)&NRF_ESB_SYS_TIMER->EVENTS_COMPARE[1]; NRF_PPI->CH[NRF_ESB_PPI_TX_START].TEP = (uint32_t)&NRF_RADIO->TASKS_TXEN; } static void start_tx_transaction() { bool ack; m_last_tx_attempts = 1; // Prepare the payload mp_current_payload = m_tx_fifo.p_payload[m_tx_fifo.exit_point]; switch (m_config_local.protocol) { case NRF_ESB_PROTOCOL_ESB: update_rf_payload_format(mp_current_payload->length); m_tx_payload_buffer[0] = mp_current_payload->pid; m_tx_payload_buffer[1] = 0; memcpy(&m_tx_payload_buffer[2], mp_current_payload->data, mp_current_payload->length); NRF_RADIO->SHORTS = m_radio_shorts_common | RADIO_SHORTS_DISABLED_RXEN_Msk; NRF_RADIO->INTENSET = RADIO_INTENSET_DISABLED_Msk | RADIO_INTENSET_READY_Msk; // Configure the retransmit counter m_retransmits_remaining = m_config_local.retransmit_count; on_radio_disabled = on_radio_disabled_tx; m_nrf_esb_mainstate = NRF_ESB_STATE_PTX_TX_ACK; break; case NRF_ESB_PROTOCOL_ESB_DPL: ack = !mp_current_payload->noack || !m_config_local.selective_auto_ack; m_tx_payload_buffer[0] = mp_current_payload->length; m_tx_payload_buffer[1] = mp_current_payload->pid << 1; m_tx_payload_buffer[1] |= mp_current_payload->noack ? 0x00 : 0x01; memcpy(&m_tx_payload_buffer[2], mp_current_payload->data, mp_current_payload->length); // Handling ack if noack is set to false or if selective auto ack is turned off if (ack) { NRF_RADIO->SHORTS = m_radio_shorts_common | RADIO_SHORTS_DISABLED_RXEN_Msk; NRF_RADIO->INTENSET = RADIO_INTENSET_DISABLED_Msk | RADIO_INTENSET_READY_Msk; // Configure the retransmit counter m_retransmits_remaining = m_config_local.retransmit_count; on_radio_disabled = on_radio_disabled_tx; m_nrf_esb_mainstate = NRF_ESB_STATE_PTX_TX_ACK; } else { NRF_RADIO->SHORTS = m_radio_shorts_common; NRF_RADIO->INTENSET = RADIO_INTENSET_DISABLED_Msk; on_radio_disabled = on_radio_disabled_tx_noack; m_nrf_esb_mainstate = NRF_ESB_STATE_PTX_TX; } break; default: // Should not be reached break; } NRF_RADIO->TXADDRESS = mp_current_payload->pipe; NRF_RADIO->RXADDRESSES = 1 << mp_current_payload->pipe; NRF_RADIO->FREQUENCY = m_esb_addr.rf_channel; NRF_RADIO->PACKETPTR = (uint32_t)m_tx_payload_buffer; NVIC_ClearPendingIRQ(RADIO_IRQn); NVIC_EnableIRQ(RADIO_IRQn); NRF_RADIO->EVENTS_ADDRESS = 0; NRF_RADIO->EVENTS_PAYLOAD = 0; NRF_RADIO->EVENTS_DISABLED = 0; DEBUG_PIN_SET(DEBUGPIN4); NRF_RADIO->TASKS_TXEN = 1; } static void on_radio_disabled_tx_noack() { m_interrupt_flags |= NRF_ESB_INT_TX_SUCCESS_MSK; tx_fifo_remove_last(); if (m_tx_fifo.count == 0) { m_nrf_esb_mainstate = NRF_ESB_STATE_IDLE; NVIC_SetPendingIRQ(ESB_EVT_IRQ); } else { NVIC_SetPendingIRQ(ESB_EVT_IRQ); start_tx_transaction(); } } static void on_radio_disabled_tx() { // Remove the DISABLED -> RXEN shortcut, to make sure the radio stays // disabled after the RX window NRF_RADIO->SHORTS = m_radio_shorts_common; // Make sure the timer is started the next time the radio is ready, // and that it will disable the radio automatically if no packet is // received by the time defined in m_wait_for_ack_timeout_us NRF_ESB_SYS_TIMER->CC[0] = m_wait_for_ack_timeout_us; NRF_ESB_SYS_TIMER->CC[1] = m_config_local.retransmit_delay - 130; NRF_ESB_SYS_TIMER->TASKS_CLEAR = 1; NRF_ESB_SYS_TIMER->EVENTS_COMPARE[0] = 0; NRF_ESB_SYS_TIMER->EVENTS_COMPARE[1] = 0; NRF_PPI->CHENSET = (1 << NRF_ESB_PPI_TIMER_START) | (1 << NRF_ESB_PPI_RX_TIMEOUT) | (1 << NRF_ESB_PPI_TIMER_STOP); NRF_PPI->CHENCLR = (1 << NRF_ESB_PPI_TX_START); NRF_RADIO->EVENTS_END = 0; if (m_config_local.protocol == NRF_ESB_PROTOCOL_ESB) { #ifdef ALWAYS_32B_ACK update_rf_payload_format(32); #else update_rf_payload_format(0); #endif } NRF_RADIO->PACKETPTR = (uint32_t)m_rx_payload_buffer; on_radio_disabled = on_radio_disabled_tx_wait_for_ack; m_nrf_esb_mainstate = NRF_ESB_STATE_PTX_RX_ACK; } static void on_radio_disabled_tx_wait_for_ack() { // This marks the completion of a TX_RX sequence (TX with ACK) // Make sure the timer will not deactivate the radio if a packet is received NRF_PPI->CHENCLR = (1 << NRF_ESB_PPI_TIMER_START) | (1 << NRF_ESB_PPI_RX_TIMEOUT) | (1 << NRF_ESB_PPI_TIMER_STOP); // If the radio has received a packet and the CRC status is OK if (NRF_RADIO->EVENTS_END && NRF_RADIO->CRCSTATUS != 0) { NRF_ESB_SYS_TIMER->TASKS_STOP = 1; NRF_PPI->CHENCLR = (1 << NRF_ESB_PPI_TX_START); m_interrupt_flags |= NRF_ESB_INT_TX_SUCCESS_MSK; m_last_tx_attempts = m_config_local.retransmit_count - m_retransmits_remaining + 1; tx_fifo_remove_last(); #ifdef ALWAYS_32B_ACK if (m_rx_payload_buffer[0] > 0) { if (rx_fifo_push_rfbuf((uint8_t)NRF_RADIO->TXADDRESS, m_rx_payload_buffer[0] & 0x3)) { m_interrupt_flags |= NRF_ESB_INT_RX_DATA_RECEIVED_MSK; } } #else if (m_config_local.protocol != NRF_ESB_PROTOCOL_ESB && m_rx_payload_buffer[0] > 0) { if (rx_fifo_push_rfbuf((uint8_t)NRF_RADIO->TXADDRESS, m_rx_payload_buffer[1] >> 1)) { m_interrupt_flags |= NRF_ESB_INT_RX_DATA_RECEIVED_MSK; } } #endif if ((m_tx_fifo.count == 0) || (m_config_local.tx_mode == NRF_ESB_TXMODE_MANUAL)) { m_nrf_esb_mainstate = NRF_ESB_STATE_IDLE; NVIC_SetPendingIRQ(ESB_EVT_IRQ); } else { NVIC_SetPendingIRQ(ESB_EVT_IRQ); start_tx_transaction(); } } else { if (m_retransmits_remaining-- == 0) { NRF_ESB_SYS_TIMER->TASKS_STOP = 1; NRF_PPI->CHENCLR = (1 << NRF_ESB_PPI_TX_START); // All retransmits are expended, and the TX operation is suspended m_last_tx_attempts = m_config_local.retransmit_count + 1; m_interrupt_flags |= NRF_ESB_INT_TX_FAILED_MSK; m_nrf_esb_mainstate = NRF_ESB_STATE_IDLE; NVIC_SetPendingIRQ(ESB_EVT_IRQ); } else { // There are still more retransmits left, TX mode should be // entered again as soon as the system timer reaches CC[1]. NRF_RADIO->SHORTS = m_radio_shorts_common | RADIO_SHORTS_DISABLED_RXEN_Msk; update_rf_payload_format(mp_current_payload->length); NRF_RADIO->PACKETPTR = (uint32_t)m_tx_payload_buffer; on_radio_disabled = on_radio_disabled_tx; m_nrf_esb_mainstate = NRF_ESB_STATE_PTX_TX_ACK; NRF_ESB_SYS_TIMER->TASKS_START = 1; NRF_PPI->CHENSET = (1 << NRF_ESB_PPI_TX_START); if (NRF_ESB_SYS_TIMER->EVENTS_COMPARE[1]) { NRF_RADIO->TASKS_TXEN = 1; } } } } static void clear_events_restart_rx(void) { NRF_RADIO->SHORTS = m_radio_shorts_common; update_rf_payload_format(m_config_local.payload_length); NRF_RADIO->PACKETPTR = (uint32_t)m_rx_payload_buffer; NRF_RADIO->EVENTS_DISABLED = 0; NRF_RADIO->TASKS_DISABLE = 1; while (NRF_RADIO->EVENTS_DISABLED == 0); NRF_RADIO->EVENTS_DISABLED = 0; NRF_RADIO->SHORTS = m_radio_shorts_common | RADIO_SHORTS_DISABLED_TXEN_Msk; NRF_RADIO->TASKS_RXEN = 1; } static void on_radio_disabled_rx(void) { bool ack = false; bool retransmit_payload = false; bool send_rx_event = true; pipe_info_t * p_pipe_info; if (NRF_RADIO->CRCSTATUS == 0) { clear_events_restart_rx(); return; } if (m_rx_fifo.count >= NRF_ESB_RX_FIFO_SIZE) { clear_events_restart_rx(); return; } p_pipe_info = &m_rx_pipe_info[NRF_RADIO->RXMATCH]; if (NRF_RADIO->RXCRC == p_pipe_info->crc && (m_rx_payload_buffer[1] >> 1) == p_pipe_info->pid ) { retransmit_payload = true; send_rx_event = false; } p_pipe_info->pid = m_rx_payload_buffer[1] >> 1; p_pipe_info->crc = NRF_RADIO->RXCRC; if ((m_config_local.selective_auto_ack == false) || ((m_rx_payload_buffer[1] & 0x01) == 1)) { ack = true; } if (ack) { NRF_RADIO->SHORTS = m_radio_shorts_common | RADIO_SHORTS_DISABLED_RXEN_Msk; switch (m_config_local.protocol) { case NRF_ESB_PROTOCOL_ESB_DPL: { if (m_tx_fifo.count > 0 && (m_tx_fifo.p_payload[m_tx_fifo.exit_point]->pipe == NRF_RADIO->RXMATCH) ) { // Pipe stays in ACK with payload until TX FIFO is empty // Do not report TX success on first ack payload or retransmit if (p_pipe_info->ack_payload == true && !retransmit_payload) { if (++m_tx_fifo.exit_point >= NRF_ESB_TX_FIFO_SIZE) { m_tx_fifo.exit_point = 0; } m_tx_fifo.count--; // ACK payloads also require TX_DS // (page 40 of the 'nRF24LE1_Product_Specification_rev1_6.pdf'). m_interrupt_flags |= NRF_ESB_INT_TX_SUCCESS_MSK; } p_pipe_info->ack_payload = true; mp_current_payload = m_tx_fifo.p_payload[m_tx_fifo.exit_point]; update_rf_payload_format(mp_current_payload->length); m_tx_payload_buffer[0] = mp_current_payload->length; memcpy(&m_tx_payload_buffer[2], mp_current_payload->data, mp_current_payload->length); } else { p_pipe_info->ack_payload = false; update_rf_payload_format(0); m_tx_payload_buffer[0] = 0; } m_tx_payload_buffer[1] = m_rx_payload_buffer[1]; } break; case NRF_ESB_PROTOCOL_ESB: { #ifdef ALWAYS_32B_ACK update_rf_payload_format(32); #else update_rf_payload_format(0); #endif m_tx_payload_buffer[0] = m_rx_payload_buffer[0]; m_tx_payload_buffer[1] = 0; } break; } m_nrf_esb_mainstate = NRF_ESB_STATE_PRX_SEND_ACK; NRF_RADIO->TXADDRESS = NRF_RADIO->RXMATCH; NRF_RADIO->PACKETPTR = (uint32_t)m_tx_payload_buffer; on_radio_disabled = on_radio_disabled_rx_ack; } else { clear_events_restart_rx(); } if (send_rx_event) { // Push the new packet to the RX buffer and trigger a received event if the operation was // successful. if (rx_fifo_push_rfbuf(NRF_RADIO->RXMATCH, p_pipe_info->pid)) { m_interrupt_flags |= NRF_ESB_INT_RX_DATA_RECEIVED_MSK; NVIC_SetPendingIRQ(ESB_EVT_IRQ); } } } static void on_radio_disabled_rx_ack(void) { NRF_RADIO->SHORTS = m_radio_shorts_common | RADIO_SHORTS_DISABLED_TXEN_Msk; update_rf_payload_format(m_config_local.payload_length); NRF_RADIO->PACKETPTR = (uint32_t)m_rx_payload_buffer; on_radio_disabled = on_radio_disabled_rx; m_nrf_esb_mainstate = NRF_ESB_STATE_PRX; } /**@brief Function for clearing pending interrupts. * * @param[in,out] p_interrupts Pointer to the value that holds the current interrupts. * * @retval NRF_SUCCESS If the interrupts were cleared successfully. * @retval NRF_ERROR_NULL If the required parameter was NULL. * @retval NRF_INVALID_STATE If the module is not initialized. */ static uint32_t nrf_esb_get_clear_interrupts(uint32_t * p_interrupts) { VERIFY_TRUE(m_esb_initialized, NRF_ERROR_INVALID_STATE); VERIFY_PARAM_NOT_NULL(p_interrupts); DISABLE_RF_IRQ(); *p_interrupts = m_interrupt_flags; m_interrupt_flags = 0; ENABLE_RF_IRQ(); return NRF_SUCCESS; } void RADIO_IRQHandler() { if (NRF_RADIO->EVENTS_READY && (NRF_RADIO->INTENSET & RADIO_INTENSET_READY_Msk)) { NRF_RADIO->EVENTS_READY = 0; DEBUG_PIN_SET(DEBUGPIN1); } if (NRF_RADIO->EVENTS_END && (NRF_RADIO->INTENSET & RADIO_INTENSET_END_Msk)) { NRF_RADIO->EVENTS_END = 0; DEBUG_PIN_SET(DEBUGPIN2); // Call the correct on_radio_end function, depending on the current protocol state if (on_radio_end) { on_radio_end(); } } if (NRF_RADIO->EVENTS_DISABLED && (NRF_RADIO->INTENSET & RADIO_INTENSET_DISABLED_Msk)) { NRF_RADIO->EVENTS_DISABLED = 0; DEBUG_PIN_SET(DEBUGPIN3); // Call the correct on_radio_disable function, depending on the current protocol state if (on_radio_disabled) { on_radio_disabled(); } } DEBUG_PIN_CLR(DEBUGPIN1); DEBUG_PIN_CLR(DEBUGPIN2); DEBUG_PIN_CLR(DEBUGPIN3); DEBUG_PIN_CLR(DEBUGPIN4); } uint32_t nrf_esb_init(nrf_esb_config_t const * p_config) { uint32_t err_code; VERIFY_PARAM_NOT_NULL(p_config); if (m_esb_initialized) { err_code = nrf_esb_disable(); if (err_code != NRF_SUCCESS) { return err_code; } } m_event_handler = p_config->event_handler; memcpy(&m_config_local, p_config, sizeof(nrf_esb_config_t)); m_interrupt_flags = 0; memset(m_rx_pipe_info, 0, sizeof(m_rx_pipe_info)); memset(m_pids, 0, sizeof(m_pids)); VERIFY_TRUE(update_radio_parameters(), NRF_ERROR_INVALID_PARAM); // Configure radio address registers according to ESB default values NRF_RADIO->BASE0 = 0xE7E7E7E7; NRF_RADIO->BASE1 = 0x43434343; NRF_RADIO->PREFIX0 = 0x23C343E7; NRF_RADIO->PREFIX1 = 0x13E363A3; initialize_fifos(); sys_timer_init(); ppi_init(); NVIC_SetPriority(RADIO_IRQn, m_config_local.radio_irq_priority & ESB_IRQ_PRIORITY_MSK); NVIC_SetPriority(ESB_EVT_IRQ, m_config_local.event_irq_priority & ESB_IRQ_PRIORITY_MSK); NVIC_EnableIRQ(ESB_EVT_IRQ); #ifdef NRF52 if(m_address_hang_fix_enable) { // Setup a timeout timer to start on an ADDRESS match, and stop on a BCMATCH event. // If the BCMATCH event never occurs the CC[0] event will fire, and the timer interrupt will disable the radio to recover. m_radio_shorts_common |= RADIO_SHORTS_ADDRESS_BCSTART_Msk; NRF_RADIO->BCC = 2; NRF_ESB_BUGFIX_TIMER->BITMODE = TIMER_BITMODE_BITMODE_32Bit << TIMER_BITMODE_BITMODE_Pos; NRF_ESB_BUGFIX_TIMER->PRESCALER = 4; NRF_ESB_BUGFIX_TIMER->CC[0] = 5; NRF_ESB_BUGFIX_TIMER->SHORTS = TIMER_SHORTS_COMPARE0_STOP_Msk | TIMER_SHORTS_COMPARE0_CLEAR_Msk; NRF_ESB_BUGFIX_TIMER->MODE = TIMER_MODE_MODE_Timer << TIMER_MODE_MODE_Pos; NRF_ESB_BUGFIX_TIMER->INTENSET = TIMER_INTENSET_COMPARE0_Msk; NRF_ESB_BUGFIX_TIMER->TASKS_CLEAR = 1; NVIC_SetPriority(NRF_ESB_BUGFIX_TIMER_IRQn, 5); NVIC_EnableIRQ(NRF_ESB_BUGFIX_TIMER_IRQn); NRF_PPI->CH[NRF_ESB_PPI_BUGFIX1].EEP = (uint32_t)&NRF_RADIO->EVENTS_ADDRESS; NRF_PPI->CH[NRF_ESB_PPI_BUGFIX1].TEP = (uint32_t)&NRF_ESB_BUGFIX_TIMER->TASKS_START; NRF_PPI->CH[NRF_ESB_PPI_BUGFIX2].EEP = (uint32_t)&NRF_RADIO->EVENTS_BCMATCH; NRF_PPI->CH[NRF_ESB_PPI_BUGFIX2].TEP = (uint32_t)&NRF_ESB_BUGFIX_TIMER->TASKS_STOP; NRF_PPI->CH[NRF_ESB_PPI_BUGFIX3].EEP = (uint32_t)&NRF_RADIO->EVENTS_BCMATCH; NRF_PPI->CH[NRF_ESB_PPI_BUGFIX3].TEP = (uint32_t)&NRF_ESB_BUGFIX_TIMER->TASKS_CLEAR; NRF_PPI->CHENSET = (1 << NRF_ESB_PPI_BUGFIX1) | (1 << NRF_ESB_PPI_BUGFIX2) | (1 << NRF_ESB_PPI_BUGFIX3); } #endif m_nrf_esb_mainstate = NRF_ESB_STATE_IDLE; m_esb_initialized = true; return NRF_SUCCESS; } uint32_t nrf_esb_suspend(void) { VERIFY_TRUE(m_nrf_esb_mainstate == NRF_ESB_STATE_IDLE, NRF_ERROR_BUSY); // Clear PPI NRF_PPI->CHENCLR = (1 << NRF_ESB_PPI_TIMER_START) | (1 << NRF_ESB_PPI_TIMER_STOP) | (1 << NRF_ESB_PPI_RX_TIMEOUT) | (1 << NRF_ESB_PPI_TX_START); m_nrf_esb_mainstate = NRF_ESB_STATE_IDLE; return NRF_SUCCESS; } uint32_t nrf_esb_disable(void) { // Clear PPI NRF_PPI->CHENCLR = (1 << NRF_ESB_PPI_TIMER_START) | (1 << NRF_ESB_PPI_TIMER_STOP) | (1 << NRF_ESB_PPI_RX_TIMEOUT) | (1 << NRF_ESB_PPI_TX_START); m_nrf_esb_mainstate = NRF_ESB_STATE_IDLE; reset_fifos(); memset(m_rx_pipe_info, 0, sizeof(m_rx_pipe_info)); memset(m_pids, 0, sizeof(m_pids)); // Disable the radio NVIC_DisableIRQ(ESB_EVT_IRQ); NRF_RADIO->SHORTS = RADIO_SHORTS_READY_START_Enabled << RADIO_SHORTS_READY_START_Pos | RADIO_SHORTS_END_DISABLE_Enabled << RADIO_SHORTS_END_DISABLE_Pos; return NRF_SUCCESS; } bool nrf_esb_is_idle(void) { return m_nrf_esb_mainstate == NRF_ESB_STATE_IDLE; } void ESB_EVT_IRQHandler(void) { ret_code_t err_code; uint32_t interrupts; nrf_esb_evt_t event; event.tx_attempts = m_last_tx_attempts; err_code = nrf_esb_get_clear_interrupts(&interrupts); if (err_code == NRF_SUCCESS && m_event_handler != 0) { if (interrupts & NRF_ESB_INT_TX_SUCCESS_MSK) { event.evt_id = NRF_ESB_EVENT_TX_SUCCESS; m_event_handler(&event); } if (interrupts & NRF_ESB_INT_TX_FAILED_MSK) { event.evt_id = NRF_ESB_EVENT_TX_FAILED; m_event_handler(&event); } if (interrupts & NRF_ESB_INT_RX_DATA_RECEIVED_MSK) { event.evt_id = NRF_ESB_EVENT_RX_RECEIVED; m_event_handler(&event); } } } uint32_t nrf_esb_write_payload(nrf_esb_payload_t const * p_payload) { VERIFY_TRUE(m_esb_initialized, NRF_ERROR_INVALID_STATE); VERIFY_PARAM_NOT_NULL(p_payload); VERIFY_PAYLOAD_LENGTH(p_payload); VERIFY_FALSE(m_tx_fifo.count >= NRF_ESB_TX_FIFO_SIZE, NRF_ERROR_NO_MEM); VERIFY_TRUE(p_payload->pipe < NRF_ESB_PIPE_COUNT, NRF_ERROR_INVALID_PARAM); DISABLE_RF_IRQ(); memcpy(m_tx_fifo.p_payload[m_tx_fifo.entry_point], p_payload, sizeof(nrf_esb_payload_t)); m_pids[p_payload->pipe] = (m_pids[p_payload->pipe] + 1) % (NRF_ESB_PID_MAX + 1); m_tx_fifo.p_payload[m_tx_fifo.entry_point]->pid = m_pids[p_payload->pipe]; if (++m_tx_fifo.entry_point >= NRF_ESB_TX_FIFO_SIZE) { m_tx_fifo.entry_point = 0; } m_tx_fifo.count++; ENABLE_RF_IRQ(); if (m_config_local.mode == NRF_ESB_MODE_PTX && m_config_local.tx_mode == NRF_ESB_TXMODE_AUTO && m_nrf_esb_mainstate == NRF_ESB_STATE_IDLE) { start_tx_transaction(); } return NRF_SUCCESS; } uint32_t nrf_esb_read_rx_payload(nrf_esb_payload_t * p_payload) { VERIFY_TRUE(m_esb_initialized, NRF_ERROR_INVALID_STATE); VERIFY_PARAM_NOT_NULL(p_payload); if (m_rx_fifo.count == 0) { return NRF_ERROR_NOT_FOUND; } DISABLE_RF_IRQ(); p_payload->length = m_rx_fifo.p_payload[m_rx_fifo.exit_point]->length; p_payload->pipe = m_rx_fifo.p_payload[m_rx_fifo.exit_point]->pipe; p_payload->rssi = m_rx_fifo.p_payload[m_rx_fifo.exit_point]->rssi; p_payload->pid = m_rx_fifo.p_payload[m_rx_fifo.exit_point]->pid; p_payload->noack = m_rx_fifo.p_payload[m_rx_fifo.exit_point]->noack; memcpy(p_payload->data, m_rx_fifo.p_payload[m_rx_fifo.exit_point]->data, p_payload->length); if (++m_rx_fifo.exit_point >= NRF_ESB_RX_FIFO_SIZE) { m_rx_fifo.exit_point = 0; } m_rx_fifo.count--; ENABLE_RF_IRQ(); return NRF_SUCCESS; } uint32_t nrf_esb_start_tx(void) { VERIFY_TRUE(m_nrf_esb_mainstate == NRF_ESB_STATE_IDLE, NRF_ERROR_BUSY); if (m_tx_fifo.count == 0) { return NRF_ERROR_BUFFER_EMPTY; } start_tx_transaction(); return NRF_SUCCESS; } uint32_t nrf_esb_start_rx(void) { VERIFY_TRUE(m_nrf_esb_mainstate == NRF_ESB_STATE_IDLE, NRF_ERROR_BUSY); NRF_RADIO->INTENCLR = 0xFFFFFFFF; NRF_RADIO->EVENTS_DISABLED = 0; on_radio_disabled = on_radio_disabled_rx; NRF_RADIO->SHORTS = m_radio_shorts_common | RADIO_SHORTS_DISABLED_TXEN_Msk; NRF_RADIO->INTENSET = RADIO_INTENSET_DISABLED_Msk; m_nrf_esb_mainstate = NRF_ESB_STATE_PRX; NRF_RADIO->RXADDRESSES = m_esb_addr.rx_pipes_enabled; NRF_RADIO->FREQUENCY = m_esb_addr.rf_channel; NRF_RADIO->PACKETPTR = (uint32_t)m_rx_payload_buffer; NVIC_ClearPendingIRQ(RADIO_IRQn); NVIC_EnableIRQ(RADIO_IRQn); NRF_RADIO->EVENTS_ADDRESS = 0; NRF_RADIO->EVENTS_PAYLOAD = 0; NRF_RADIO->EVENTS_DISABLED = 0; NRF_RADIO->TASKS_RXEN = 1; return NRF_SUCCESS; } uint32_t nrf_esb_stop_rx(void) { if (m_nrf_esb_mainstate == NRF_ESB_STATE_PRX) { NRF_RADIO->SHORTS = 0; NRF_RADIO->INTENCLR = 0xFFFFFFFF; on_radio_disabled = NULL; NRF_RADIO->EVENTS_DISABLED = 0; NRF_RADIO->TASKS_DISABLE = 1; while (NRF_RADIO->EVENTS_DISABLED == 0); m_nrf_esb_mainstate = NRF_ESB_STATE_IDLE; return NRF_SUCCESS; } return NRF_ESB_ERROR_NOT_IN_RX_MODE; } uint32_t nrf_esb_flush_tx(void) { VERIFY_TRUE(m_esb_initialized, NRF_ERROR_INVALID_STATE); DISABLE_RF_IRQ(); m_tx_fifo.count = 0; m_tx_fifo.entry_point = 0; m_tx_fifo.exit_point = 0; ENABLE_RF_IRQ(); return NRF_SUCCESS; } uint32_t nrf_esb_pop_tx(void) { VERIFY_TRUE(m_esb_initialized, NRF_ERROR_INVALID_STATE); VERIFY_TRUE(m_tx_fifo.count > 0, NRF_ERROR_BUFFER_EMPTY); DISABLE_RF_IRQ(); if (++m_tx_fifo.entry_point >= NRF_ESB_TX_FIFO_SIZE) { m_tx_fifo.entry_point = 0; } m_tx_fifo.count--; ENABLE_RF_IRQ(); return NRF_SUCCESS; } uint32_t nrf_esb_flush_rx(void) { VERIFY_TRUE(m_esb_initialized, NRF_ERROR_INVALID_STATE); DISABLE_RF_IRQ(); m_rx_fifo.count = 0; m_rx_fifo.entry_point = 0; m_rx_fifo.exit_point = 0; memset(m_rx_pipe_info, 0, sizeof(m_rx_pipe_info)); ENABLE_RF_IRQ(); return NRF_SUCCESS; } uint32_t nrf_esb_set_address_length(uint8_t length) { VERIFY_TRUE(m_nrf_esb_mainstate == NRF_ESB_STATE_IDLE, NRF_ERROR_BUSY); VERIFY_TRUE(length > 2 && length < 6, NRF_ERROR_INVALID_PARAM); /* Workaround for nRF52832 Rev 1 Errata 107 Check if pipe 0 or pipe 1-7 has a 'zero address'. Avoid using access addresses in the following pattern (where X is don't care): ADDRLEN=5 BASE0 = 0x0000XXXX, PREFIX0 = 0xXXXXXX00 BASE1 = 0x0000XXXX, PREFIX0 = 0xXXXX00XX BASE1 = 0x0000XXXX, PREFIX0 = 0xXX00XXXX BASE1 = 0x0000XXXX, PREFIX0 = 0x00XXXXXX BASE1 = 0x0000XXXX, PREFIX1 = 0xXXXXXX00 BASE1 = 0x0000XXXX, PREFIX1 = 0xXXXX00XX BASE1 = 0x0000XXXX, PREFIX1 = 0xXX00XXXX BASE1 = 0x0000XXXX, PREFIX1 = 0x00XXXXXX ADDRLEN=4 BASE0 = 0x00XXXXXX, PREFIX0 = 0xXXXXXX00 BASE1 = 0x00XXXXXX, PREFIX0 = 0xXXXX00XX BASE1 = 0x00XXXXXX, PREFIX0 = 0xXX00XXXX BASE1 = 0x00XXXXXX, PREFIX0 = 0x00XXXXXX BASE1 = 0x00XXXXXX, PREFIX1 = 0xXXXXXX00 BASE1 = 0x00XXXXXX, PREFIX1 = 0xXXXX00XX BASE1 = 0x00XXXXXX, PREFIX1 = 0xXX00XXXX BASE1 = 0x00XXXXXX, PREFIX1 = 0x00XXXXXX */ uint32_t base_address_mask = length == 5 ? 0xFFFF0000 : 0xFF000000; if((NRF_RADIO->BASE0 & base_address_mask) == 0 && (NRF_RADIO->PREFIX0 & 0x000000FF) == 0) { return NRF_ERROR_INVALID_PARAM; } if((NRF_RADIO->BASE1 & base_address_mask) == 0 && ((NRF_RADIO->PREFIX0 & 0x0000FF00) == 0 ||(NRF_RADIO->PREFIX0 & 0x00FF0000) == 0 || (NRF_RADIO->PREFIX0 & 0xFF000000) == 0 || (NRF_RADIO->PREFIX1 & 0xFF000000) == 0 || (NRF_RADIO->PREFIX1 & 0x00FF0000) == 0 ||(NRF_RADIO->PREFIX1 & 0x0000FF00) == 0 || (NRF_RADIO->PREFIX1 & 0x000000FF) == 0)) { return NRF_ERROR_INVALID_PARAM; } m_esb_addr.addr_length = length; update_rf_payload_format(m_config_local.payload_length); return NRF_SUCCESS; } uint32_t nrf_esb_set_base_address_0(uint8_t const * p_addr) { VERIFY_TRUE(m_nrf_esb_mainstate == NRF_ESB_STATE_IDLE, NRF_ERROR_BUSY); VERIFY_PARAM_NOT_NULL(p_addr); /* Workaround for nRF52832 Rev 1 Errata 107 Check if pipe 0 or pipe 1-7 has a 'zero address'. Avoid using access addresses in the following pattern (where X is don't care): ADDRLEN=5 BASE0 = 0x0000XXXX, PREFIX0 = 0xXXXXXX00 BASE1 = 0x0000XXXX, PREFIX0 = 0xXXXX00XX BASE1 = 0x0000XXXX, PREFIX0 = 0xXX00XXXX BASE1 = 0x0000XXXX, PREFIX0 = 0x00XXXXXX BASE1 = 0x0000XXXX, PREFIX1 = 0xXXXXXX00 BASE1 = 0x0000XXXX, PREFIX1 = 0xXXXX00XX BASE1 = 0x0000XXXX, PREFIX1 = 0xXX00XXXX BASE1 = 0x0000XXXX, PREFIX1 = 0x00XXXXXX ADDRLEN=4 BASE0 = 0x00XXXXXX, PREFIX0 = 0xXXXXXX00 BASE1 = 0x00XXXXXX, PREFIX0 = 0xXXXX00XX BASE1 = 0x00XXXXXX, PREFIX0 = 0xXX00XXXX BASE1 = 0x00XXXXXX, PREFIX0 = 0x00XXXXXX BASE1 = 0x00XXXXXX, PREFIX1 = 0xXXXXXX00 BASE1 = 0x00XXXXXX, PREFIX1 = 0xXXXX00XX BASE1 = 0x00XXXXXX, PREFIX1 = 0xXX00XXXX BASE1 = 0x00XXXXXX, PREFIX1 = 0x00XXXXXX */ uint32_t base_address_mask = m_esb_addr.addr_length == 5 ? 0xFFFF0000 : 0xFF000000; if((addr_conv(p_addr) & base_address_mask) == 0 && (NRF_RADIO->PREFIX0 & 0x000000FF) == 0) { return NRF_ERROR_INVALID_PARAM; } memcpy(m_esb_addr.base_addr_p0, p_addr, 4); update_radio_addresses(NRF_ESB_ADDR_UPDATE_MASK_BASE0); return apply_address_workarounds(); } uint32_t nrf_esb_set_base_address_1(uint8_t const * p_addr) { VERIFY_TRUE(m_nrf_esb_mainstate == NRF_ESB_STATE_IDLE, NRF_ERROR_BUSY); VERIFY_PARAM_NOT_NULL(p_addr); /* Workaround for nRF52832 Rev 1 Errata 107 Check if pipe 0 or pipe 1-7 has a 'zero address'. Avoid using access addresses in the following pattern (where X is don't care): ADDRLEN=5 BASE0 = 0x0000XXXX, PREFIX0 = 0xXXXXXX00 BASE1 = 0x0000XXXX, PREFIX0 = 0xXXXX00XX BASE1 = 0x0000XXXX, PREFIX0 = 0xXX00XXXX BASE1 = 0x0000XXXX, PREFIX0 = 0x00XXXXXX BASE1 = 0x0000XXXX, PREFIX1 = 0xXXXXXX00 BASE1 = 0x0000XXXX, PREFIX1 = 0xXXXX00XX BASE1 = 0x0000XXXX, PREFIX1 = 0xXX00XXXX BASE1 = 0x0000XXXX, PREFIX1 = 0x00XXXXXX ADDRLEN=4 BASE0 = 0x00XXXXXX, PREFIX0 = 0xXXXXXX00 BASE1 = 0x00XXXXXX, PREFIX0 = 0xXXXX00XX BASE1 = 0x00XXXXXX, PREFIX0 = 0xXX00XXXX BASE1 = 0x00XXXXXX, PREFIX0 = 0x00XXXXXX BASE1 = 0x00XXXXXX, PREFIX1 = 0xXXXXXX00 BASE1 = 0x00XXXXXX, PREFIX1 = 0xXXXX00XX BASE1 = 0x00XXXXXX, PREFIX1 = 0xXX00XXXX BASE1 = 0x00XXXXXX, PREFIX1 = 0x00XXXXXX */ uint32_t base_address_mask = m_esb_addr.addr_length == 5 ? 0xFFFF0000 : 0xFF000000; if((addr_conv(p_addr) & base_address_mask) == 0 && ((NRF_RADIO->PREFIX0 & 0x0000FF00) == 0 ||(NRF_RADIO->PREFIX0 & 0x00FF0000) == 0 || (NRF_RADIO->PREFIX0 & 0xFF000000) == 0 || (NRF_RADIO->PREFIX1 & 0xFF000000) == 0 || (NRF_RADIO->PREFIX1 & 0x00FF0000) == 0 ||(NRF_RADIO->PREFIX1 & 0x0000FF00) == 0 || (NRF_RADIO->PREFIX1 & 0x000000FF) == 0)) { return NRF_ERROR_INVALID_PARAM; } memcpy(m_esb_addr.base_addr_p1, p_addr, 4); update_radio_addresses(NRF_ESB_ADDR_UPDATE_MASK_BASE1); return apply_address_workarounds(); } uint32_t nrf_esb_set_prefixes(uint8_t const * p_prefixes, uint8_t num_pipes) { VERIFY_TRUE(m_nrf_esb_mainstate == NRF_ESB_STATE_IDLE, NRF_ERROR_BUSY); VERIFY_PARAM_NOT_NULL(p_prefixes); VERIFY_TRUE(num_pipes < 9, NRF_ERROR_INVALID_PARAM); /* Workaround for nRF52832 Rev 1 Errata 107 Check if pipe 0 or pipe 1-7 has a 'zero address'. Avoid using access addresses in the following pattern (where X is don't care): ADDRLEN=5 BASE0 = 0x0000XXXX, PREFIX0 = 0xXXXXXX00 BASE1 = 0x0000XXXX, PREFIX0 = 0xXXXX00XX BASE1 = 0x0000XXXX, PREFIX0 = 0xXX00XXXX BASE1 = 0x0000XXXX, PREFIX0 = 0x00XXXXXX BASE1 = 0x0000XXXX, PREFIX1 = 0xXXXXXX00 BASE1 = 0x0000XXXX, PREFIX1 = 0xXXXX00XX BASE1 = 0x0000XXXX, PREFIX1 = 0xXX00XXXX BASE1 = 0x0000XXXX, PREFIX1 = 0x00XXXXXX ADDRLEN=4 BASE0 = 0x00XXXXXX, PREFIX0 = 0xXXXXXX00 BASE1 = 0x00XXXXXX, PREFIX0 = 0xXXXX00XX BASE1 = 0x00XXXXXX, PREFIX0 = 0xXX00XXXX BASE1 = 0x00XXXXXX, PREFIX0 = 0x00XXXXXX BASE1 = 0x00XXXXXX, PREFIX1 = 0xXXXXXX00 BASE1 = 0x00XXXXXX, PREFIX1 = 0xXXXX00XX BASE1 = 0x00XXXXXX, PREFIX1 = 0xXX00XXXX BASE1 = 0x00XXXXXX, PREFIX1 = 0x00XXXXXX */ uint32_t base_address_mask = m_esb_addr.addr_length == 5 ? 0xFFFF0000 : 0xFF000000; if(num_pipes >= 1 && (NRF_RADIO->BASE0 & base_address_mask) == 0 && p_prefixes[0] == 0) { return NRF_ERROR_INVALID_PARAM; } if((NRF_RADIO->BASE1 & base_address_mask) == 0) { for (uint8_t i = 1; i < num_pipes; i++) { if (p_prefixes[i] == 0) { return NRF_ERROR_INVALID_PARAM; } } } memcpy(m_esb_addr.pipe_prefixes, p_prefixes, num_pipes); m_esb_addr.num_pipes = num_pipes; m_esb_addr.rx_pipes_enabled = BIT_MASK_UINT_8(num_pipes); update_radio_addresses(NRF_ESB_ADDR_UPDATE_MASK_PREFIX); return apply_address_workarounds(); } uint32_t nrf_esb_update_prefix(uint8_t pipe, uint8_t prefix) { VERIFY_TRUE(m_nrf_esb_mainstate == NRF_ESB_STATE_IDLE, NRF_ERROR_BUSY); VERIFY_TRUE(pipe < 8, NRF_ERROR_INVALID_PARAM); /* Workaround for nRF52832 Rev 1 Errata 107 Check if pipe 0 or pipe 1-7 has a 'zero address'. Avoid using access addresses in the following pattern (where X is don't care): ADDRLEN=5 BASE0 = 0x0000XXXX, PREFIX0 = 0xXXXXXX00 BASE1 = 0x0000XXXX, PREFIX0 = 0xXXXX00XX BASE1 = 0x0000XXXX, PREFIX0 = 0xXX00XXXX BASE1 = 0x0000XXXX, PREFIX0 = 0x00XXXXXX BASE1 = 0x0000XXXX, PREFIX1 = 0xXXXXXX00 BASE1 = 0x0000XXXX, PREFIX1 = 0xXXXX00XX BASE1 = 0x0000XXXX, PREFIX1 = 0xXX00XXXX BASE1 = 0x0000XXXX, PREFIX1 = 0x00XXXXXX ADDRLEN=4 BASE0 = 0x00XXXXXX, PREFIX0 = 0xXXXXXX00 BASE1 = 0x00XXXXXX, PREFIX0 = 0xXXXX00XX BASE1 = 0x00XXXXXX, PREFIX0 = 0xXX00XXXX BASE1 = 0x00XXXXXX, PREFIX0 = 0x00XXXXXX BASE1 = 0x00XXXXXX, PREFIX1 = 0xXXXXXX00 BASE1 = 0x00XXXXXX, PREFIX1 = 0xXXXX00XX BASE1 = 0x00XXXXXX, PREFIX1 = 0xXX00XXXX BASE1 = 0x00XXXXXX, PREFIX1 = 0x00XXXXXX */ uint32_t base_address_mask = m_esb_addr.addr_length == 5 ? 0xFFFF0000 : 0xFF000000; if (pipe == 0) { if((NRF_RADIO->BASE0 & base_address_mask) == 0 && prefix == 0) { return NRF_ERROR_INVALID_PARAM; } } else{ if((NRF_RADIO->BASE1 & base_address_mask) == 0 && prefix == 0) { return NRF_ERROR_INVALID_PARAM; } } m_esb_addr.pipe_prefixes[pipe] = prefix; update_radio_addresses(NRF_ESB_ADDR_UPDATE_MASK_PREFIX); return apply_address_workarounds(); } uint32_t nrf_esb_enable_pipes(uint8_t enable_mask) { VERIFY_TRUE(m_nrf_esb_mainstate == NRF_ESB_STATE_IDLE, NRF_ERROR_BUSY); m_esb_addr.rx_pipes_enabled = enable_mask; return apply_address_workarounds(); } uint32_t nrf_esb_set_rf_channel(uint32_t channel) { VERIFY_TRUE(m_nrf_esb_mainstate == NRF_ESB_STATE_IDLE, NRF_ERROR_BUSY); VERIFY_TRUE(channel <= 100, NRF_ERROR_INVALID_PARAM); m_esb_addr.rf_channel = channel; return NRF_SUCCESS; } uint32_t nrf_esb_get_rf_channel(uint32_t * p_channel) { VERIFY_PARAM_NOT_NULL(p_channel); *p_channel = m_esb_addr.rf_channel; return NRF_SUCCESS; } uint32_t nrf_esb_set_tx_power(nrf_esb_tx_power_t tx_output_power) { VERIFY_TRUE(m_nrf_esb_mainstate == NRF_ESB_STATE_IDLE, NRF_ERROR_BUSY); if ( m_config_local.tx_output_power != tx_output_power ) { m_config_local.tx_output_power = tx_output_power; update_radio_tx_power(); } return NRF_SUCCESS; } uint32_t nrf_esb_set_retransmit_delay(uint16_t delay) { VERIFY_TRUE(m_nrf_esb_mainstate == NRF_ESB_STATE_IDLE, NRF_ERROR_BUSY); VERIFY_TRUE(delay >= NRF_ESB_RETRANSMIT_DELAY_MIN, NRF_ERROR_INVALID_PARAM); m_config_local.retransmit_delay = delay; return NRF_SUCCESS; } uint32_t nrf_esb_set_retransmit_count(uint16_t count) { VERIFY_TRUE(m_nrf_esb_mainstate == NRF_ESB_STATE_IDLE, NRF_ERROR_BUSY); m_config_local.retransmit_count = count; return NRF_SUCCESS; } uint32_t nrf_esb_set_bitrate(nrf_esb_bitrate_t bitrate) { VERIFY_TRUE(m_nrf_esb_mainstate == NRF_ESB_STATE_IDLE, NRF_ERROR_BUSY); m_config_local.bitrate = bitrate; return update_radio_bitrate() ? NRF_SUCCESS : NRF_ERROR_INVALID_PARAM; } uint32_t nrf_esb_reuse_pid(uint8_t pipe) { VERIFY_TRUE(m_nrf_esb_mainstate == NRF_ESB_STATE_IDLE, NRF_ERROR_BUSY); VERIFY_TRUE(pipe < 8, NRF_ERROR_INVALID_PARAM); m_pids[pipe] = (m_pids[pipe] + NRF_ESB_PID_MAX) % (NRF_ESB_PID_MAX + 1); return NRF_SUCCESS; } // Handler for #ifdef NRF52 void NRF_ESB_BUGFIX_TIMER_IRQHandler(void) { if(NRF_ESB_BUGFIX_TIMER->EVENTS_COMPARE[0]) { NRF_ESB_BUGFIX_TIMER->EVENTS_COMPARE[0] = 0; // If the timeout timer fires and we are in the PTX receive ACK state, disable the radio if(m_nrf_esb_mainstate == NRF_ESB_STATE_PTX_RX_ACK) { NRF_RADIO->TASKS_DISABLE = 1; } } } #endif Could you try it and see if it works now? Again; this is highly experimental and given "as is", it may likely break other configurations of nrf_esb, so it should only be used for your scenario! Best regards, Håkon

ESB ACK packet not received?

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