/** @file sc_pressure sensor.c
*
* @defgroup user application
* @{
* @ingroup sensor comm
* @brief file.
*
* This file contains the source code for a pressure sensor management
*
*/
#define PRE_SENSOR_CONFIG_LOG_ENABLED 1
#define NRF_LOG_MODULE_NAME PS
#if PRE_SENSOR_CONFIG_LOG_ENABLED
#define NRF_LOG_LEVEL BLE_NUS_CONFIG_LOG_LEVEL
#define NRF_LOG_INFO_COLOR BLE_NUS_CONFIG_INFO_COLOR
#define NRF_LOG_DEBUG_COLOR BLE_NUS_CONFIG_DEBUG_COLOR
#else // PRE_SENSOR_CONFIG_LOG_ENABLED
#define NRF_LOG_LEVEL 0
#endif // PRE_SENSOR_CONFIG_LOG_ENABLED
#include "nrf_log.h"
NRF_LOG_MODULE_REGISTER();
//-----------------------------------/
// Include files
//-----------------------------------/
#include <stdio.h>
#include "sc_pressure_sensor.h"
#include "sc_timer.h"
#include "common.h"
#include "custom_board.h"
#include "nrf_drv_twi.h"
//-----------------------------------/
// Macros
//-----------------------------------/
#define TWI_INSTANCE_ID 0
#define PRESS_SEN_ADDR 0x28
#define constrain(amt,low,high) ((amt)<(low)?(low):((amt)>(high)?(high):(amt)))
//-----------------------------------/
// Global Variables
//-----------------------------------/
/* TWI instance. */
static const nrf_drv_twi_t m_twi = NRF_DRV_TWI_INSTANCE(TWI_INSTANCE_ID);
static bool is_sens_present = false;
static bool is_pres_reading_available = false;
static float press_data = 0;
// Transfer Function of SSCDANN150PG2A3
static const int outMin = 1638; // 1638 counts (10% of 2^14 counts or 0x0666)
static const int outMax = 14745; // 14745 counts (90% of 2^14 counts or 0x3999)
static const float pMin = 0;
static const float pMax = 150;
//-----------------------------------/
// Private functions
//-----------------------------------/
/**
* @brief TWI initialization.
*/
static void twi_init (void)
{
ret_code_t err_code;
const nrf_drv_twi_config_t twi_config = {
.scl = PRE_SENSOR_CLK,
.sda = PRE_SENSOR_DATA,
.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_config, NULL, NULL);
APP_ERROR_CHECK(err_code);
nrf_drv_twi_enable(&m_twi);
}
/**
* @brief Function calculates pressure from raw pressure data.
*/
static float getPressure(uint16_t rawP)
{
return ((float)(((constrain(rawP, outMin, outMax) - outMin) * (pMax - pMin) / (outMax - outMin)) + pMin));
}
static void mes_app_timer_cb(void)
{
NRF_LOG_INFO("Pres Mes Trigg");
press_data = get_ssc_data();
}
/**
* @brief Function to fetch data from SSC.
*/
float get_ssc_data(void)
{
ret_code_t err_code;
uint8_t raw_values[4];
err_code = nrf_drv_twi_rx(&m_twi, PRESS_SEN_ADDR, raw_values, 4);
APP_ERROR_CHECK(err_code);
SSC_DATA_STATUS statusBit = (SSC_DATA_STATUS) (raw_values[0] >> 6);
NRF_LOG_INFO("Pres Status = 0x%02X", statusBit);
float pressure = 0.00;
uint16_t rawPressure;
switch(statusBit)
{
case VALID_DATA:
rawPressure = (((uint16_t) (raw_values[0] & 0x3f)) << 8) | raw_values[1];
pressure = getPressure(rawPressure);
NRF_LOG_INFO("Pres = "NRF_LOG_FLOAT_MARKER, NRF_LOG_FLOAT(pressure));
set_pressure_data_available(true);
break;
case COMMAND_PROCESSING:
break;
case STALE_DATA:
break;
case DIAGNOSTIC_CONDITION:
break;
default:
break;
}
return pressure;
}
//-----------------------------------/
// public functions
//-----------------------------------/
ret_code_t init_pressure_sensor(void)
{
ret_code_t err_code;
uint8_t sample_data;
twi_init();
err_code = nrf_drv_twi_rx(&m_twi, PRESS_SEN_ADDR, &sample_data, sizeof(sample_data));
if (err_code == NRF_SUCCESS)
{
is_sens_present = true;
NRF_LOG_INFO("Pressure sensor I2C address 0x%x.", PRESS_SEN_ADDR);
}
if (!is_sens_present)
{
NRF_LOG_INFO("No device was found.");
}
NRF_LOG_FLUSH();
reg_acq_timer(mes_app_timer_cb);
return err_code;
}
bool is_pressure_data_available(void)
{
return is_pres_reading_available;
}
void set_pressure_data_available(bool flag)
{
is_pres_reading_available = flag;
}
uint16_t get_pressure_data(void)
{
uint32_t press = 0;
press = press_data * 1000;
NRF_LOG_INFO("Press Data = %d", press);
return ((uint16_t) press);
}
/* End of file */
/**
* @}
*/
Hi,
I am using SDK 16.0.0 and nRF52833. In which TWI (master mode) is not working.
Pressure sensor is connected over I2C. (NRF_DRV_TWI_INSTANCE(0))
Previously I am using SDK 16.0.0 and nRF52840 and It was working fine.
We changed BLE module in hardware due to availability of BL654 (52840) and new hardware made with BL653(52833).
So I migrated my code for 52833 and found this issue.
As per Errata of 52833 for revision 1 "TWIM: I2C timing spec is violated at 400 kHz" so I changed frequency to 100 kHz but its not working.
Also in SDK16.0.0 and SDK17.1.0 there no example code available for PCA10100 (\examples\peripheral\twi_scanner).
If I use PCA10056 "twi_scanner" code for 52833 firmware stuck while "nrf_drv_twi_enable(&m_twi);" function called.
Can you help me fix this issue? If you have example code for PCA10100 please share it so I can test it..
Just for your information, I am using NRF_DRV_SPI_INSTANCE(1) and NRF_DRV_SPI_INSTANCE(2) for other peripherals in firmware.
Thanks,
Nirav Patel
