Good afternoon,
I am able to write data using polling mode with the macro NRF_SERIAL_CONFIG_DEF(serial_config, NRF_SERIAL_MODE_POLLING, NULL, NULL, NULL, NULL). I am using the peripheral example serial program in the nrf5 SDK v15.0.0. I checked the UART lines with the Logic Analyzer and it shows bytes sending to and receiving from the machine. However I am not able to read the incoming data stream with the nrf_serial_read function. The function will block and never return.
The functionality I am trying to achieve is very trivial and does not need any complex queues and interrupt handlers. I just have to read and store data from the UART. An example or code snippet describing the nuances of the nrf_serial_read function would be very helpful.
Thank you in advance.
Sabine
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#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
//PPOS
#include <string.h>
#include "app_timer.h"
#include "nrf.h"
#include "nrf_delay.h"
#include "nrf_drv_clock.h"
#include "nrf_drv_power.h"
#include "nrf_gpio.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_serial.h"
#include "app_error.h"
#include "app_util.h"
#include "boards.h"
//PPOS
#include "zzsdk_config.h"
/** @file
* @defgroup nrf_serial_example main.c
* @{
* @ingroup nrf_serial_example
* @brief Example of @ref nrf_serial usage.
*
*/
#define OP_QUEUES_SIZE 3
#define APP_TIMER_PRESCALER NRF_SERIAL_APP_TIMER_PRESCALER
static void sleep_handler(void) {
__WFE();
__SEV();
__WFE();
}
NRF_SERIAL_DRV_UART_CONFIG_DEF(m_uart0_drv_config,
RX_PIN_NUMBER, TX_PIN_NUMBER,
RTS_PIN_NUMBER, CTS_PIN_NUMBER,
NRF_UART_HWFC_DISABLED,
//NRF_UART_HWFC_ENABLED,
NRF_UART_PARITY_EXCLUDED,
//NRF_UART_BAUDRATE_115200,
NRF_UART_BAUDRATE_9600,
UART_DEFAULT_CONFIG_IRQ_PRIORITY);
#define SERIAL_FIFO_TX_SIZE 32
//#define SERIAL_FIFO_RX_SIZE 32
#define SERIAL_FIFO_RX_SIZE 48
NRF_SERIAL_QUEUES_DEF(serial_queues, SERIAL_FIFO_TX_SIZE, SERIAL_FIFO_RX_SIZE);
#define SERIAL_BUFF_TX_SIZE 1
#define SERIAL_BUFF_RX_SIZE 1
NRF_SERIAL_BUFFERS_DEF(serial_buffs, SERIAL_BUFF_TX_SIZE, SERIAL_BUFF_RX_SIZE);
NRF_SERIAL_CONFIG_DEF(serial_config, NRF_SERIAL_MODE_POLLING,
NULL, NULL, NULL, NULL);
// &serial_queues, &serial_buffs, NULL, sleep_handler);
NRF_SERIAL_UART_DEF(serial_uart, 0);
//PPOS
#define STX 0x02
#define ACK 0x06
/**@brief Function for receiving Initialization package 0x74.
*/
void receiveSQInitPackage(void) {
ret_code_t ret; // Return value of the nrf_serial_read function
uint8_t cnt = 0;
//static char responseArray[35] = {0};
char BCC[] = {STX};
static char BCCbyte[] = {0x14};
char ACKbyte[] = {ACK};
char uart_buf[35]; // Read UART buffer
while (true) {
char c; // Read UART character
ret = nrf_serial_read(&serial_uart, &c, sizeof(c), NULL, NRF_SERIAL_MAX_TIMEOUT);
APP_ERROR_CHECK(ret);
uart_buf[cnt++] = c;
if (c == BCCbyte) {
cnt = 0;
}
}
ret = nrf_serial_write(&serial_uart, ACKbyte, sizeof(ACKbyte), NULL, NRF_SERIAL_MAX_TIMEOUT); //end of sequence ACK
(void)nrf_serial_flush(&serial_uart, 0);
APP_ERROR_CHECK(ret);
} //end
int main(void) {
ret_code_t ret;
//PPOS
uint8_t n, i = 0;
static char STXbyte[] = {STX};
static char commandArray[] = {0x09, 0x73, 0x00, 0x00, 0x00, 0x02, 0x01, 0x10, 0x00, 0x02};
char BCC[] = {STX};
static char BCCbyte[] = {0x69};
ret = nrf_drv_clock_init();
APP_ERROR_CHECK(ret);
ret = nrf_drv_power_init(NULL);
APP_ERROR_CHECK(ret);
nrf_drv_clock_lfclk_request(NULL);
ret = app_timer_init();
APP_ERROR_CHECK(ret);
// Initialize LEDs and buttons.
bsp_board_init(BSP_INIT_LEDS | BSP_INIT_BUTTONS);
ret = nrf_serial_init(&serial_uart, &m_uart0_drv_config, &serial_config);
APP_ERROR_CHECK(ret);
ret = nrf_serial_write(&serial_uart, STXbyte, sizeof(STXbyte), NULL, NRF_SERIAL_MAX_TIMEOUT);
APP_ERROR_CHECK(ret);
ret = nrf_serial_write(&serial_uart,
commandArray,
commandArray[0] + 1, //length = 0x09 + 1
NULL,
NRF_SERIAL_MAX_TIMEOUT);
APP_ERROR_CHECK(ret);
for (i = 0; i <= 9; i++) {
BCC[i] = BCC[i] ^ commandArray[i];
if (i == 9) {
sprintf(BCCbyte, "%c", BCC[i]);
//printf("0x%02x ", BCC[i]); //debugger
}
} //end for 2
ret = nrf_serial_write(&serial_uart, BCCbyte, sizeof(BCCbyte), NULL, NRF_SERIAL_MAX_TIMEOUT);
(void)nrf_serial_flush(&serial_uart, 0);
APP_ERROR_CHECK(ret);
receiveSQInitPackage();
} //end main
/** @} */
