How can I make nrf52832 talk to Microbit by RADIO (Gazell) ?

Question

I see that BBC Micro:bit uses nrf51822 and can use RADIO peripheral. 
 So I tried to make my nrf52832 DK to talk to Micro:bit by using Gazell library and referencing MicroBitRadio of Github. 
 (nrf5 SDK version is 14.0) 
 But it cannot get any data packet. (No "nrf_gzll_host_rx_data_ready" callback) 
 #define MICROBIT_RADIO_BASE_ADDRESS 0x75626974
 
 // in main() function, I have added the followings before enable gazell.
 GAZELLE_ERROR_CODE_CHECK(nrf_gzll_set_base_address_0(MICROBIT_RADIO_BASE_ADDRESS));
 GAZELLE_ERROR_CODE_CHECK(nrf_gzll_set_address_prefix_byte(0, 0));// pipe, address_prefix_byte 
 How can I do this ? Is there any mistakes ? 
 
 I made a test code as the attached zip 
 by modifying 
RF5_SDK_14.0.0_3bcc1f7\examples\proprietary_rf\gzll\gzll_ack_payload \host. 
 Micro:bit code is here. 
 makecode.microbit.org/_EJJcxY5C2d6k 
 
 Other references: 
 github.com/.../MicroBitRadio.cpp 
 https://github.com/lancaster-university/microbit-dal/blob/master/inc/drivers/MicroBitRadio.h 
 https://tech.microbit.org/hardware/#low-level-radio-communications 
 host_test.zip

Sigurd · Accepted Answer

Hi, The MicroBitRadio protocol might be gazell inspired, but it's not really 100% gazell and it also configures the RADIO differently than what gazell does in our SDK .(e.g. RADIO PCNF0/PCNF1 registers). I got the gazell example to receive the microbit packets, here is the code i used(SDK15.2): /** * Copyright (c) 2012 - 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. * */ /** * This project requires that a device that runs the * @ref gzll_device_m_ack_payload_example is used as a counterpart for * receiving the data. This can be on either an nRF5x device or an nRF24Lxx device * running the \b gzll_device_m_ack_payload example in the nRFgo SDK. * * This example listens for a packet and sends an ACK * when a packet is received. The contents of the first payload byte of * the received packet is output on the GPIO Port BUTTONS. * The contents of GPIO Port LEDS are sent in the first payload byte (byte 0) * of the ACK packet. */ #include "nrf_gzll.h" #include "bsp.h" #include "app_timer.h" #include "app_error.h" #include "nrf_gzll_error.h" #include "nrf_log.h" #include "nrf_log_ctrl.h" #include "nrf_log_default_backends.h" /*****************************************************************************/ /** @name Configuration */ /*****************************************************************************/ #define PIPE_NUMBER 0 /**< Pipe 0 is used in this example. */ #define TX_PAYLOAD_LENGTH 1 /**< 1-byte payload length is used when transmitting. */ #define MICROBIT_RADIO_MAX_PACKET_SIZE 32 static uint8_t m_data_payload[NRF_GZLL_CONST_MAX_PAYLOAD_LENGTH]; /**< Placeholder for data payload received from host. */ static uint8_t m_ack_payload[TX_PAYLOAD_LENGTH]; /**< Payload to attach to ACK sent to device. */ #if GZLL_TX_STATISTICS static nrf_gzll_tx_statistics_t m_statistics; /**< Struct containing transmission statistics. */ #endif #if GZLL_PA_LNA_CONTROL #define GZLL_PA_LNA_TIMER CONCAT_2(NRF_TIMER, GZLL_PA_LNA_TIMER_NUM) /**< Convert timer number into timer struct. */ /**< PA/LNA structure configuration. */ static nrf_gzll_pa_lna_cfg_t m_pa_lna_cfg = { .lna_enabled = GZLL_LNA_ENABLED, .pa_enabled = GZLL_PA_ENABLED, .lna_active_high = GZLL_LNA_ACTIVE_HIGH, .pa_active_high = GZLL_PA_ACTIVE_HIGH, .lna_gpio_pin = GZLL_PA_LNA_CRX_PIN, .pa_gpio_pin = GZLL_PA_LNA_CTX_PIN, .pa_gpiote_channel = GZLL_PA_LNA_TX_GPIOTE_CHAN, .lna_gpiote_channel = GZLL_PA_LNA_RX_GPIOTE_CHAN, .timer = GZLL_PA_LNA_TIMER, .ppi_channels[0] = GZLL_PA_LNA_PPI_CHAN_1, .ppi_channels[1] = GZLL_PA_LNA_PPI_CHAN_2, .ppi_channels[2] = GZLL_PA_LNA_PPI_CHAN_3, .ppi_channels[3] = GZLL_PA_LNA_PPI_CHAN_4, .ramp_up_time = GZLL_PA_LNA_RAMP_UP_TIME }; static int32_t m_rssi_sum = 0; /**< Variable used to calculate average RSSI. */ static int32_t m_packets_cnt = 0; /**< Transmitted packets counter. */ #endif /** * @brief Function to read the button state. * * @return Returns states of the buttons. */ static uint8_t input_get(void) { uint8_t result = 0; for (uint32_t i = 0; i < BUTTONS_NUMBER; i++) { if (bsp_button_is_pressed(i)) { result |= (1 << i); } } return ~(result); } /** * @brief Function to control the LED outputs. * * @param[in] val Desirable state of the LEDs. */ static void output_present(uint8_t val) { uint32_t i; for (i = 0; i < LEDS_NUMBER; i++) { if (val & (1 << i)) { bsp_board_led_on(i); } else { bsp_board_led_off(i); } } } /** * @brief Initialize the BSP modules. */ static void ui_init(void) { uint32_t err_code; // Initialize application timer. err_code = app_timer_init(); APP_ERROR_CHECK(err_code); // BSP initialization. err_code = bsp_init(BSP_INIT_LEDS | BSP_INIT_BUTTONS, NULL); APP_ERROR_CHECK(err_code); // Set up logger. err_code = NRF_LOG_INIT(NULL); APP_ERROR_CHECK(err_code); NRF_LOG_DEFAULT_BACKENDS_INIT(); NRF_LOG_INFO("Gazell ACK payload example. Host mode."); NRF_LOG_FLUSH(); bsp_board_init(BSP_INIT_LEDS); } /*****************************************************************************/ /** @name Gazell callback function definitions. */ /*****************************************************************************/ /** * @brief RX data ready callback. * * @details If a data packet was received, the first byte is written to LEDS. */ void nrf_gzll_host_rx_data_ready(uint32_t pipe, nrf_gzll_host_rx_info_t rx_info) { uint32_t data_payload_length = NRF_GZLL_CONST_MAX_PAYLOAD_LENGTH; // Pop packet and write first byte of the payload to the GPIO port. bool result_value = nrf_gzll_fetch_packet_from_rx_fifo(pipe, m_data_payload, &data_payload_length); if (!result_value) { NRF_LOG_ERROR("RX fifo error "); } if (data_payload_length > 0) { output_present(m_data_payload[0]); } // Read buttons and load ACK payload into TX queue. m_ack_payload[0] = input_get(); // Button logic is inverted. result_value = nrf_gzll_add_packet_to_tx_fifo(pipe, m_ack_payload, TX_PAYLOAD_LENGTH); if (!result_value) { NRF_LOG_ERROR("TX fifo error "); } #if GZLL_PA_LNA_CONTROL m_rssi_sum += rx_info.rssi; m_packets_cnt++; #endif } /** * @brief Gazelle callback. * @warning Required for successful Gazell initialization. */ void nrf_gzll_device_tx_success(uint32_t pipe, nrf_gzll_device_tx_info_t tx_info) { } /** * @brief Gazelle callback. * @warning Required for successful Gazell initialization. */ void nrf_gzll_device_tx_failed(uint32_t pipe, nrf_gzll_device_tx_info_t tx_info) { } /** * @brief Gazelle callback. * @warning Required for successful Gazell initialization. */ void nrf_gzll_disabled() { } #if GZLL_PA_LNA_CONTROL /** * @brief Function for configuring front end control in Gazell. */ static bool front_end_control_setup(void) { bool result_value = true; // Configure pins controlling SKY66112 module. nrf_gpio_cfg_output(GZLL_PA_LNA_CHL_PIN); nrf_gpio_cfg_output(GZLL_PA_LNA_CPS_PIN); nrf_gpio_cfg_output(GZLL_PA_LNA_ANT_SEL_PIN); nrf_gpio_cfg_output(GZLL_PA_LNA_CSD_PIN); // Turn on front end module. nrf_gpio_pin_clear(GZLL_PA_LNA_CHL_PIN); nrf_gpio_pin_clear(GZLL_PA_LNA_CPS_PIN); nrf_gpio_pin_clear(GZLL_PA_LNA_ANT_SEL_PIN); nrf_gpio_pin_set(GZLL_PA_LNA_CSD_PIN); // PA/LNA configuration must be called after @ref nrf_gzll_init() and before @ref nrf_gzll_enable() result_value = nrf_gzll_set_pa_lna_cfg(&m_pa_lna_cfg); return result_value; } #endif /*****************************************************************************/ /** * @brief Main function. * @return ANSI required int return type. */ /*****************************************************************************/ #define NRF_GZLL_TEST_CHANNEL_TABLE_SIZE 1 #define MICROBIT_RADIO_BASE_ADDRESS 0x75626974 static uint8_t Test_chanel_table[] = {7}; static uint32_t swap_bits(uint32_t inp) { uint32_t i; uint32_t retval = 0; inp = (inp & 0x000000FFUL); for (i = 0; i < 8; i++) { retval |= ((inp >> i) & 0x01) << (7 - i); } return retval; } static uint32_t bytewise_bitswap(uint32_t inp) { return (swap_bits(inp >> 24) << 24) | (swap_bits(inp >> 16) << 16) | (swap_bits(inp >> 8) << 8) | (swap_bits(inp)); } int main() { // Set up the user interface. ui_init(); // Initialize Gazell. bool result_value = nrf_gzll_init(NRF_GZLL_MODE_HOST); GAZELLE_ERROR_CODE_CHECK(result_value); #if GZLL_PA_LNA_CONTROL // Initialize external PA/LNA control. result_value = front_end_control_setup(); GAZELLE_ERROR_CODE_CHECK(result_value); #endif #if GZLL_TX_STATISTICS // Turn on transmission statistics gathering. result_value = nrf_gzll_tx_statistics_enable(&m_statistics); GAZELLE_ERROR_CODE_CHECK(result_value); #endif // Load data into TX queue. m_ack_payload[0] = input_get(); result_value = nrf_gzll_add_packet_to_tx_fifo(PIPE_NUMBER, m_data_payload, TX_PAYLOAD_LENGTH); if (!result_value) { NRF_LOG_ERROR("TX fifo error "); NRF_LOG_FLUSH(); } //Edit nrf_gzll_set_channel_table(Test_chanel_table,NRF_GZLL_TEST_CHANNEL_TABLE_SIZE); GAZELLE_ERROR_CODE_CHECK(nrf_gzll_set_base_address_0(bytewise_bitswap(0x74696275))); GAZELLE_ERROR_CODE_CHECK(nrf_gzll_set_address_prefix_byte(0, 0));// pipe, address_prefix_byte GAZELLE_ERROR_CODE_CHECK(nrf_gzll_set_datarate(NRF_GZLL_DATARATE_1MBIT)); // Enable Gazell to start sending over the air. result_value = nrf_gzll_enable(); GAZELLE_ERROR_CODE_CHECK(result_value); //Edit NRF_RADIO->PCNF0 = 0x00000008; NRF_RADIO->PCNF1 = 0x02040000 | MICROBIT_RADIO_MAX_PACKET_SIZE; NRF_RADIO->DATAWHITEIV = 0x18; NRF_LOG_INFO("Gzll ack payload host example started."); while (true) { NRF_LOG_FLUSH(); __WFE(); #if GZLL_PA_LNA_CONTROL if (m_packets_cnt >= 1000) { CRITICAL_REGION_ENTER(); // Print info about average RSSI. NRF_LOG_RAW_INFO(" "); NRF_LOG_INFO("Average RSSI: %d", (m_rssi_sum / m_packets_cnt)); m_packets_cnt = 0; m_rssi_sum = 0; CRITICAL_REGION_EXIT(); } #endif #if GZLL_TX_STATISTICS if (m_statistics.packets_num >= 1) { CRITICAL_REGION_ENTER(); // Print all transmission statistics. NRF_LOG_RAW_INFO(" "); NRF_LOG_INFO("Total received packets: %4u", m_statistics.packets_num); NRF_LOG_INFO("Total CRC failures: %03u ", m_statistics.timeouts_num); for (uint8_t i = 0; i < nrf_gzll_get_channel_table_size(); i++) { NRF_LOG_INFO("Channel %u: %03u packets received, %03u CRC failures.", i, m_statistics.channel_packets[i], m_statistics.channel_timeouts[i]); } CRITICAL_REGION_EXIT(); // Reset statistics buffers. nrf_gzll_reset_tx_statistics(); } #endif } } That said, it might be better for you to use ESB or the radio directly.

How can I make nrf52832 talk to Microbit by RADIO (Gazell) ?

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