I'm using nRF52 DK (PCA10040) <TWI sensor> example.
On line 139, printed result = NRF_SUCCESS
However, the program doesn't print line 142. Instead, the code jumps to twi_handler()
And then, the code doesn't print line 191. It prints line 206: Case 22: NRF_DRV_TWI_EVT_ADDRESS_NACK
A screenshot of PuTTY is given below
My code is here:
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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 <math.h>
#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.
* 1) U means data type is "unsigned". Another example of data type is L, which means "long"
* 2) >> is the right shift operator, which means to shift the bit to the right by xxx positions.
* e.g. if a = 5 (0000 0101), (a<<1)=10 because (0000 1010)=10
* 3) The prefix 0x means hexadecimal value
* 0x21U in hex = 2*(16^1) + 1*(16^0) = 33 in decimal
* By seeing the datasheet of SDP3x sensor: address=0x22 when ADDR connects to 1.2K resistor
* That's why we define address = 0x22U here
*/
// When ADDR connects to GND/1.2k resistor, it uses the default I2C address: 0x21/0x22 (Got this info from datasheet)
#define SENSOR_ADDR (0x22 >> 1)
/* Chose mode for master and slave. Use 1 bit (LSB) to indicate that
- If master reads data from slave, use 1
- If master sends data to slave, use 0
In order to set sensor as continuous mode, use register 0x3608
*/
#define continuous_mode_command1 0x36
#define continuous_mode_command2 0x24
uint16_t tempVal;
float tempC;
/* Indicates if operation on TWI has ended. */
static volatile bool m_xfer_done = false;
/* Creating a TWI master driver instance. */
static const nrf_drv_twi_t m_twi = NRF_DRV_TWI_INSTANCE(TWI_INSTANCE_ID);
/* Buffer for samples read from sensor.
SDP3x digital sensor outputs a 16-bits data. Since m_sample is 8-bit, so we need to use m_smaple[2] for 16-bit.
*/
static uint8_t m_sample[2];
/**
* @brief Function for setting mode on sensor
*/
void sensor_set_mode(void)
{
NRF_LOG_INFO("sensor_set_mode 000\r\n");
ret_code_t err_code;
NRF_LOG_INFO("sensor_set_mode started\r\n");
// Writing CONTINUOUS_MODE = 0x3608U into SDP3x configuration register. Set SDP3x sensor in continuous mode.
uint8_t reg0 = continuous_mode_command1;
uint8_t reg1 = continuous_mode_command2;
NRF_LOG_INFO("regt0 = %d , 0x%x\r\n",reg0,reg0);
NRF_LOG_INFO("regt1 = %d , 0x%x\r\n",reg1,reg1);
//uint16_t reg = ((reg0 << 8) | reg1);
uint8_t reg[2] = {reg0,reg1};
NRF_LOG_INFO("reg16bit: 0x%x %x\r\n",reg[0],reg[1]);
/* Function for sending data to a TWI slave.
* @param[in] p_instance Pointer to the driver instance structure.
* @param[in] address Address of a specific slave device (only 7 LSB).
* @param[in] p_data Pointer to a transmit buffer.
* @param[in] length Number of bytes to send.
* @param[in] no_stop If set, the stop condition is not generated on the bus
* after the transfer has completed successfully (allowing
* for a repeated start in the next transfer).
This function will return NRF_SUCCESS if the procedure was successful.
*/
err_code = nrf_drv_twi_tx(&m_twi, SENSOR_ADDR, reg, sizeof(reg), false);
APP_ERROR_CHECK(err_code);
NRF_LOG_INFO("error code = %s\r\n",nrf_strerror_find(err_code));
//NRF_LOG_INFO("sizeof reg = %d\r\n",sizeof(reg));
NRF_LOG_INFO(" set i2c address\r\n");
while (m_xfer_done == false);
NRF_LOG_INFO("done1\r\n");
}
/**
* @brief Function for handling data from temperature sensor.
*
* @param[in] temp Pressure value read from sensor.
*/
__STATIC_INLINE void data_handler(uint16_t pressure_raw_data)
{
float pressure;
float pressure_scale = 60.0;
pressure = pressure_raw_data / pressure_scale ;
NRF_LOG_INFO("raw_data = %d , pressure = " NRF_LOG_FLOAT_MARKER "\r\n",pressure_raw_data,NRF_LOG_FLOAT(pressure));
}
/**
@brief Structure for a TWI event.
typedef struct
{
nrf_drv_twi_evt_type_t type; ///< 3 TWI master event types (enum): DONE, address_NACK, data_NACK
nrf_drv_twi_xfer_desc_t xfer_desc; ///< Transfer details.
} nrf_drv_twi_evt_t;
*/
/**
* @brief TWI events handler.
*/
void twi_handler(nrf_drv_twi_evt_t const * p_event, void * p_context)
{
// type: TWI master event types
// foo->bar is equivalent to (*foo).bar, i.e. it gets the member called bar from the struct that foo points to.
switch (p_event->type)
{
NRF_LOG_INFO("Test222\r\n");
case NRF_DRV_TWI_EVT_DONE: // Transfer completed event.
// NRF_DRV_TWI_XFER_RX: is TWI master driver transfer types (Rx transfer)
if (p_event->xfer_desc.type == NRF_DRV_TWI_XFER_RX)
{
NRF_LOG_INFO("Case 11: NRF_DRV_TWI_EVT_DONE\r\n");
uint16_t pressure = ((m_sample[0] << 8) | m_sample[1]);
data_handler(pressure);
}
m_xfer_done = true;
break;
case NRF_DRV_TWI_EVT_ADDRESS_NACK:
///< Error event: NACK received after sending the address.
NRF_LOG_INFO("Case 22: NRF_DRV_TWI_EVT_ADDRESS_NACK\r\n");
break;
case NRF_DRV_TWI_EVT_DATA_NACK:
///< Error event: NACK received after sending a data byte.
NRF_LOG_INFO("Case 33: NRF_DRV_TWI_EVT_DATA_NACK\r\n");
break;
default:
NRF_LOG_INFO("1 Default");
break;
}
NRF_LOG_INFO("Test 2\r\n");
}
/**
* @brief UART initialization.
*/
void twi_init (void)
{
ret_code_t err_code;
// Structure for the TWI master driver instance configuration.
const nrf_drv_twi_config_t twi_lm75b_config = {
.scl = ARDUINO_SCL_PIN,
.sda = ARDUINO_SDA_PIN,
.frequency = NRF_DRV_TWI_FREQ_100K, // Options: 100K, 250K, 400K
.interrupt_priority = APP_IRQ_PRIORITY_HIGH,
.clear_bus_init = false
};
NRF_LOG_INFO("111\r\n");
err_code = nrf_drv_twi_init(&m_twi, &twi_lm75b_config, twi_handler, NULL);
APP_ERROR_CHECK(err_code);
NRF_LOG_INFO("222\r\n");
nrf_drv_twi_enable(&m_twi);
NRF_LOG_INFO("333\r\n");
}
/**
* @brief Function for reading data from temperature sensor.
*/
static void read_sensor_data()
{
m_xfer_done = false;
NRF_LOG_INFO("read_sensor_data\r\n");
/* Read 1 byte from the specified address - skip 3 bits dedicated for fractional part of temperature.
* Function for reading data from a TWI slave.
*
* The transmission will be stopped when an error occurs. If a transfer is ongoing,
* the function returns the error code @ref NRF_ERROR_BUSY.
*
* @param[in] p_instance Pointer to the driver instance structure.
* @param[in] address Address of a specific slave device (only 7 LSB).
* @param[in] p_data Pointer to a receive buffer.
* @param[in] length Number of bytes to be received.
*
* @retval NRF_SUCCESS If the procedure was successful.
*/
ret_code_t err_code1 = nrf_drv_twi_rx(&m_twi, SENSOR_ADDR, &m_sample[0], sizeof(m_sample));
ret_code_t err_code2 = nrf_drv_twi_rx(&m_twi, SENSOR_ADDR, &m_sample[1], sizeof(m_sample));
APP_ERROR_CHECK(err_code1);
APP_ERROR_CHECK(err_code2);
uint16_t complete_data = ((uint16_t)m_sample[0] << 8) | m_sample[1];
NRF_LOG_INFO("complete data = %d \r\n",complete_data);
}
/**
* @brief Function for main application entry.
*/
int main(void)
{
NRF_LOG_INFO("aaa\r\n");
APP_ERROR_CHECK(NRF_LOG_INIT(NULL));
NRF_LOG_INFO("bbb\r\n");
NRF_LOG_DEFAULT_BACKENDS_INIT();
NRF_LOG_INFO("\r\nTWI sensor example started.");
NRF_LOG_INFO("444\r\n");
twi_init();
NRF_LOG_INFO("555\r\n");
sensor_set_mode();
NRF_LOG_INFO("666\r\n");
NRF_LOG_FLUSH();
// NRF_LOG_INFO("Size = %d\r\n",sizeof(m_sample));
while (true)
{
NRF_LOG_INFO("777\r\n");
nrf_delay_ms(500);
NRF_LOG_FLUSH();
do
{
NRF_LOG_INFO("888\r\n");
NRF_LOG_FLUSH();
nrf_delay_ms(200);
// Wait For Event
__WFE();
}while (m_xfer_done == false);
NRF_LOG_INFO("999\r\n");
read_sensor_data();
NRF_LOG_INFO("000\r\n");
NRF_LOG_FLUSH();
}
}
/** @} */
Question:
1) Do you know why it's not printing in sequence, please? Some printing sections seem to be skipped.
2) Do you know how to solve "NRF_DRV_TWI_EVT_ADDRESS_NACK", please?
