Dear All,
We have designed our custom board based on BMD-330 (nRF52810 chipset). It uses i2c (TWI) to communicate with Azoteq IQS620A sensor.
TWI code runs fine on nRF52-DK (based on nRF52832) and BMD-330-EVAL (based on nRF52810), but when I run the same code on the custom board, the nrf_drv_twi_rx function returns error code 0x17 (busy).
By the way, I have already removed the DEVELOP_IN_NRF52832 and NRFX_COREDEP_DELAY_US_LOOP_CYCLES=3 flags.
main.c
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/** @file
* @defgroup tw_sensor_example main.c
* @{
* @ingroup nrf_twi_example
* @brief TWI Sensor Example main file.
*
* This file contains the source code for a sample application using TWI.
*
*/
#include <stdio.h>
#include "boards.h"
#include "app_util_platform.h"
#include "app_error.h"
#include "nrf_drv_twi.h"
#include "nrf_delay.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
/* TWI instance ID. */
#define TWI_INSTANCE_ID 0
/* Common addresses definition for temperature sensor. */
#define IQS620A_ADDR 0x44
/* Indicates if operation on TWI has ended. */
static volatile bool m_xfer_done = false;
/* TWI instance. */
static const nrf_drv_twi_t m_twi = NRF_DRV_TWI_INSTANCE(TWI_INSTANCE_ID);
/* Buffer for samples read from sensor. */
static uint8_t m_sample;
/**
* @brief TWI events handler.
*/
void twi_handler(nrf_drv_twi_evt_t const * p_event, void * p_context)
{
switch (p_event->type)
{
case NRF_DRV_TWI_EVT_DONE:
m_xfer_done = true;
break;
default:
break;
}
}
/**
* @brief UART initialization.
*/
void twi_init (void)
{
ret_code_t err_code;
const nrf_drv_twi_config_t iqs620a_config = {
.scl = 7,
.sda = 6,
.frequency = NRF_DRV_TWI_FREQ_400K,
.interrupt_priority = APP_IRQ_PRIORITY_HIGH,
.clear_bus_init = false
};
err_code = nrf_drv_twi_init(&m_twi, &iqs620a_config, twi_handler, NULL);
APP_ERROR_CHECK(err_code);
nrf_drv_twi_enable(&m_twi);
}
/**
* @brief Function for reading data from temperature sensor.
*/
static void read_sensor_data()
{
uint32_t err_code = NRF_SUCCESS;
m_xfer_done = false;
/* Read 1 byte from the specified address - skip 3 bits dedicated for fractional part of temperature. */
err_code = nrf_drv_twi_rx(&m_twi, IQS620A_ADDR, &m_sample, sizeof(m_sample));
if (err_code != NRF_SUCCESS) return;
while(m_xfer_done == false);
APP_ERROR_CHECK(err_code);
}
/**
* @brief Function for main application entry.
*/
int main(void)
{
APP_ERROR_CHECK(NRF_LOG_INIT(NULL));
NRF_LOG_DEFAULT_BACKENDS_INIT();
NRF_LOG_INFO("\r\nTWI sensor example started.");
NRF_LOG_FLUSH();
twi_init();
while (true)
{
nrf_delay_ms(500);
read_sensor_data();
NRF_LOG_FLUSH();
}
}
/** @} */
Any help to why this issue is occuring on the custom board would be highly appreciated.
Thanks,
Ahmad Shakir
Vulpés Electronics GmbH
