STTS751 temperature sensor integration with nrf52

[The_user_23]

HI,

I am trying to use STTS751-1DP3F temp. sensor with nr52832. The drivers for sensors are given on:

https://github.com/STMicroelectronics/STMems_Standard_C_drivers/tree/master/stts751_STdC 

i tried to change the platform write and read function as follows

static int32_t platform_write(void *handle, uint8_t reg,
                              uint8_t *bufp,
                              uint16_t len)
{
		ret_code_t err_code;
    //HAL_I2C_Mem_Write(handle, STTS751_0xxxx_ADD_7K5, reg,
    //                  I2C_MEMADD_SIZE_8BIT, bufp, len, 1000);
		m_xfer_done = false;
    err_code = nrf_drv_twi_tx(handle, reg, bufp, len, false);
    APP_ERROR_CHECK(err_code);
    while (m_xfer_done == false);
  return 0;
}
static int32_t platform_read(void *handle, uint8_t reg, uint8_t *bufp,
                             uint16_t len)
{
		ret_code_t err_code;
    //HAL_I2C_Mem_Read(handle, STTS751_0xxxx_ADD_7K5, reg,
     //                I2C_MEMADD_SIZE_8BIT, bufp, len, 1000);
		m_xfer_done = false;
    err_code = nrf_drv_twi_rx(handle, reg, bufp, len);
    APP_ERROR_CHECK(err_code);
    
  return 0;
}

i also tried to redefine the structure as:

typedef struct {
  /** Component mandatory fields **/
  stmdev_write_ptr  write_reg;
  stmdev_read_ptr   read_reg;
  /** Customizable optional pointer **/
  //void *handle;
	nrf_drv_twi_t *handle;
} stmdev_ctx_t;

but  am getting following error

.\..\..\main.c(135): error: #513: a value of type "nrf_drv_twi_t" cannot be assigned to an entity of type "nrf_drv_twi_t *"
dev_ctx.handle = SENSOR_BUS;

please help me for the same

thanks and regards

Rajat

[Susheel Nuguru]

what code do you have at main.c(135) ?

[The_user_23]

Fullscreen 074513.main.c Download

#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"

#include "stts751_reg.h"

typedef union {
  int16_t i16bit;
  uint8_t u8bit[2];
} axis1bit16_t;
static axis1bit16_t data_raw_temperature;
static float temperature_degC;
static stts751_id_t whoamI;
static uint8_t tx_buffer[1000];

static int32_t platform_write(void *handle, uint8_t reg,
                              uint8_t *bufp,
                              uint16_t len);
static int32_t platform_read(void *handle, uint8_t reg, uint8_t *bufp,
                             uint16_t len);


#define SENSOR_BUS  m_twi

/* TWI instance ID. */
#define TWI_INSTANCE_ID     0

/* Indicates if operation on TWI has ended. */
static volatile bool m_xfer_done = false;

/* TWI instance. */
static nrf_drv_twi_t m_twi = NRF_DRV_TWI_INSTANCE(TWI_INSTANCE_ID);

/**
 * @brief Function for handling data from temperature sensor.
 *
 * @param[in] temp          Temperature in Celsius degrees read from sensor.
 */
__STATIC_INLINE void data_handler(uint8_t temp)
{
    NRF_LOG_INFO("Temperature: %d Celsius degrees.", temp);
}

/**
 * @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:
            if (p_event->xfer_desc.type == NRF_DRV_TWI_XFER_RX)
            {
                //data_handler(m_sample);
            }
            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 twi_lm75b_config = {
       .scl                = ARDUINO_SCL_PIN,
       .sda                = ARDUINO_SDA_PIN,
       .frequency          = NRF_DRV_TWI_FREQ_100K,
       .interrupt_priority = APP_IRQ_PRIORITY_HIGH,
       .clear_bus_init     = false
    };

    err_code = nrf_drv_twi_init(&m_twi, &twi_lm75b_config, twi_handler, NULL);
    APP_ERROR_CHECK(err_code);

    nrf_drv_twi_enable(&m_twi);
}


static int32_t platform_write(void *handle, uint8_t reg,
                              uint8_t *bufp,
                              uint16_t len)
{
		ret_code_t err_code;
    //HAL_I2C_Mem_Write(handle, STTS751_0xxxx_ADD_7K5, reg,
    //                  I2C_MEMADD_SIZE_8BIT, bufp, len, 1000);
		m_xfer_done = false;
    err_code = nrf_drv_twi_tx(handle, reg, bufp, len, false);
    APP_ERROR_CHECK(err_code);
    while (m_xfer_done == false);
  return 0;
}
static int32_t platform_read(void *handle, uint8_t reg, uint8_t *bufp,
                             uint16_t len)
{
		ret_code_t err_code;
    //HAL_I2C_Mem_Read(handle, STTS751_0xxxx_ADD_7K5, reg,
     //                I2C_MEMADD_SIZE_8BIT, bufp, len, 1000);
		m_xfer_done = false;
    err_code = nrf_drv_twi_rx(handle, reg, bufp, len);
    APP_ERROR_CHECK(err_code);
    
  return 0;
}
/**
 * @brief Function for reading data from temperature sensor.
 */

/**
 * @brief Function for main application entry.
 */

int main(void)
{
    APP_ERROR_CHECK(NRF_LOG_INIT(NULL));
    NRF_LOG_DEFAULT_BACKENDS_INIT();
	
		stmdev_ctx_t dev_ctx;
		dev_ctx.write_reg = platform_write;
		dev_ctx.read_reg = platform_read;
		dev_ctx.handle = SENSOR_BUS;
	
		stts751_device_id_get(&dev_ctx, &whoamI);
	
    NRF_LOG_INFO("\r\nTWI sensor example started.");
    NRF_LOG_FLUSH();
    twi_init();
    //LM75B_set_mode();

    while (true)
    {
        nrf_delay_ms(500);
				if ((whoamI.product_id != STTS751_ID_1xxxx) ||
       (whoamI.manufacturer_id != STTS751_ID_MAN) ||
       (whoamI.revision_id != STTS751_REV) ){
			 NRF_LOG_INFO("\r\nTWI sensor working.");
			 }
        NRF_LOG_FLUSH();
    }
}

/** @} */

[Susheel Nuguru]

there is nothing at line 135 in your main.c,  I do not see a correlation of that error to the code you provided

[The_user_23]

twi_sensor_id.rar

please find enclosed project.

thanks and regards

Rajat

[Susheel Nuguru]

You need to change

#define SENSOR_BUS m_twi

to 

#define SENSOR_BUS &m_twi