Hi, I connect the HDC2080 with nrf 52832. but I cant read anything from the terminal.
What It's showing is just
[ <info> app:
TWI sensor example]
and I connect SDA --> pin 27
SCL --> pin25
INTI --> not connected
VCC --> VDD
GND --> GND
Please help me thanks!/**
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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"
//#define NRF_LOG_MODULE_NAME APP
#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 HDC2080 sensor. */
#define HDC2080_ADDR 0x40U
#define HDC2080_REG_TEMP_LOW 0x00U
#define HDC2080_REG_TEMP_HIGH 0x01U
#define HDC2080_REG_HUM_LOW 0x02U
#define HDC2080_REG_HUM_HIGH 0x03U
#define HDC2080_REG_CONF 0x0FU
#define device_scl 11
#define device_sda 12
/* Mode for HDC2080. */
#define MEAS_TRIG 1U
/* 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 byte read from HDC2080 sensor - 8 bit register- (temp_low,temp_high,hum_low,hum_high). */
static uint8_t m_sample[4] = {0,0,0,0};
/* Buffer for the real temp calculation - 16 bits once concatenated - */
static uint16_t temp = 0;
/* Buffer for the real hum calculation - 16 bits once concatenated - */
static uint16_t hum = 0;
/* Buffer for the calculated value of temp*/
static float temp_calc = 0;
/* Buffer for the calculated value of hum*/
static float hum_calc = 0;
/**
* @brief Function for triggering measurement on HDC2080.
*/
void HDC2080_trigger_measurement(void)
{
// m_xfer_done = 0;
ret_code_t err_code;
/* Writing to HDC2080_REG_CONF "1" to trigger measurements. */
uint8_t reg[2] = {HDC2080_REG_CONF,MEAS_TRIG};
err_code = nrf_drv_twi_tx(&m_twi, HDC2080_ADDR, reg, sizeof(reg), false);
APP_ERROR_CHECK(err_code);
NRF_LOG_INFO("\r\nMulti-read enable\r\n");
while (m_xfer_done == false);
/* Writing to pointer byte. */
reg[0] = HDC2080_REG_TEMP_LOW;
m_xfer_done = false;
NRF_LOG_INFO("\r\nTemp\r\n");
err_code = nrf_drv_twi_tx(&m_twi, HDC2080_ADDR, reg, 1, false);
APP_ERROR_CHECK(err_code);
while (m_xfer_done == false);
}
/**
* @brief Function for handling data from temperature sensor.
*
* @param[in] temp Temperature in Celsius degrees read from sensor.
* @param[in] hum Humidity in % read from sensor.
*/
__STATIC_INLINE void data_handler(float temp, float hum)
{
NRF_LOG_INFO("Temperature: \r" NRF_LOG_FLOAT_MARKER " Celsius\r\n", NRF_LOG_FLOAT(temp));
NRF_LOG_INFO("Humidity: \r" NRF_LOG_FLOAT_MARKER " %%\r\n", NRF_LOG_FLOAT(hum));
}
/**
* @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)
{
/* Temperature conversion formula given in HDC2080 Datasheet - page 18 */
temp = (uint8_t)m_sample[1] << 8 | m_sample[0];
temp_calc = (float)(temp) * 165 / 65536 - 40;
/* Humidity conversion formula given in HDC2080 Datasheet - page 18 */
hum = (uint8_t)m_sample[3] << 8 | m_sample[2];
hum_calc = (float)(hum)/(65536) * 100;
/* Passing temp and hum to data_handler */
data_handler(temp_calc, hum_calc);
}
m_xfer_done = true;
/* not sure about this part if it is ok or not */
if (p_event->xfer_desc.type == NRF_DRV_TWI_XFER_TX)
{
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_HDC2080_config = {
.scl = ARDUINO_SCL_PIN,
.sda = ARDUINO_SDA_PIN,
.frequency = NRF_TWI_FREQ_100K,
/* I'm using IRQ priority low because i want to use this code with S130 Softdevice in the future */
.interrupt_priority = APP_IRQ_PRIORITY_LOW,
.clear_bus_init = false
};
err_code = nrf_drv_twi_init(&m_twi, &twi_HDC2080_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()
{
ret_code_t err_code;
/* Read 4 bytes starting from the specified address */
/* Start reading from HDC2080_REG_TEMP_LOW through HDC2080_REG_HUM_HIGH */
/* This is working because on the terminal I can see temp and hum values */
err_code = nrf_drv_twi_rx(&m_twi, HDC2080_ADDR, m_sample, sizeof(m_sample));
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\r\n");
NRF_LOG_FLUSH();
twi_init();
/* this is where i'm having trouble */
/* if this function sits here, it triggers only one reading since we're out of the while loop */
/* and then when read_sensor_data is called, it always sends the same measurement since this is */
/* what the sensor saved in his registers the first time HDC2080_trigger_measurement was called */
HDC2080_trigger_measurement();
while (true)
{
/* But if i put HDC2080_trigger_measurement function here, it gives one reading on the output */
/* and then the program ends saying "Fatal error" ?!?!?! */
// HDC2080_trigger_measurement();
do
{
__WFE();
}while (m_xfer_done == false);
read_sensor_data();
NRF_LOG_FLUSH();
nrf_delay_ms(1000);
}
}
