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temperature.c
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temperature.c
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/*!
* @brief Example shows basic application to configure and read the temperature.
*/
#include <stdio.h>
#include <stdint.h>
#include "bmp280.h"
#include <sys/ioctl.h>
#include <stdlib.h>
#include <fcntl.h>
#include <linux/i2c-dev.h>
#include <unistd.h>
#include <time.h>
void delay_ms(uint32_t period_ms);
int8_t i2c_reg_write(uint8_t i2c_addr, uint8_t reg_addr, uint8_t *reg_data, uint16_t length);
int8_t i2c_reg_read(uint8_t i2c_addr, uint8_t reg_addr, uint8_t *reg_data, uint16_t length);
int8_t spi_reg_write(uint8_t cs, uint8_t reg_addr, uint8_t *reg_data, uint16_t length);
int8_t spi_reg_read(uint8_t cs, uint8_t reg_addr, uint8_t *reg_data, uint16_t length);
void print_rslt(const char api_name[], int8_t rslt);
//////
int g_i2cFid; // I2C Linux device handle
// open the Linux device
void i2cOpen()
{
g_i2cFid = open("/dev/i2c-8", O_RDWR);
if (g_i2cFid < 0) {
perror("i2cOpen");
exit(1);
}
else
{
printf("I2C geöffnet\n\r");
printf("Device_Nr.:%i\n\r", g_i2cFid);
}
}
// set the I2C slave address for all subsequent I2C device transfers
void i2cSetAddress(int address)
{
if (ioctl(g_i2cFid, I2C_SLAVE, address) < 0) {
perror("i2cSetAddress");
exit(1);
}
else
{
printf("I2C-Adresse: 0x%x\n\r", address);
}
}
/////// Pit
// Device ID 0x58 auslesen
void checkID(void)
{
int wert;
uint8_t reg[1];
reg[0]=0xd0;
write(g_i2cFid, reg, 1);
wert = read(g_i2cFid, reg, 1);
//read(g_i2cFid, reg_data, length)
//wert = bus_read( 0x76, 0xd0, reg, 1)
printf("ID: 0x%x\n\r", reg[0]);
}
/*
* Read operation in either I2C or SPI
*
* param[in] dev_addr I2C or SPI device address
* param[in] reg_addr register address
* param[out] reg_data pointer to the memory to be used to store
* the read data
* param[in] length number of bytes to be read
*
* return result of the bus communication function
*/
//int8_t i2c_reg_read(uint8_t i2c_addr, uint8_t reg_addr, uint8_t *reg_data, uint16_t length)
int8_t bus_read(uint8_t i2c_addr, uint8_t reg_addr, uint8_t *reg_data,
uint16_t length)
{
int8_t rslt = 0; /* Return 0 for Success, non-zero for failure */
uint8_t reg[1];
reg[0]=reg_addr;
printf("in_read\n\r");
printf("Addr:%x\n\r", i2c_addr);
printf("RegAddr:%x\n\r", reg_addr);
printf("lenght:%i\n\r", length);
if (write(g_i2cFid, reg, 1) != 1) {
perror("user_i2c_read_reg Schreibfehler");
printf("reg:%i\n\r", reg[0]);
rslt = 1;
}
else
{
printf("ERFOLG! Write in Reg 1\n\r");
printf("length:%i\n\r", length);
}
if (read(g_i2cFid, reg_data, length) != length) {
perror("user_i2c_read_data");
printf("length_reg_data:%i\n\r", length);
rslt = 1;
}
/*else
{
printf("ERFOLG! Write Reg Data\n\r");
}
*/
return rslt;
}
/*
* Write operation in either I2C or SPI
*
* param[in] dev_addr I2C or SPI device address
* param[in] reg_addr register address
* param[in] reg_data. pointer to the data to be written
* param[in] length number of bytes to be written
*
* return result of the bus communication function
*/
int8_t bus_write(uint8_t i2c_addr, uint8_t reg_addr, uint8_t *reg_data,
uint16_t length)
{
printf("in_write\n\r\n");
int8_t rslt = 0; /* Return 0 for Success, non-zero for failure */
uint8_t reg[16]; //[16];
reg[0]=reg_addr;
int i;
for (i=1; i<length +1; i++)
{
reg[i] = reg_data[i-1];
delay_ms(500);
}
printf("absolut_vor_write\n\r\n");
printf("Device:%i\n\r", g_i2cFid);
printf("length:%i\n\r", length);
printf("reg[0]:%i\n\r", reg[0]);
printf("reg[1]:%i\n\r", reg[1]);
printf("reg[2]:%i\n\r", reg[2]);
printf("reg[3]:%i\n\r", reg[3]);
printf("reg[4]:%i\n\r", reg[4]);
printf("Zähler i:%i\n\r", i);
// Device Handle von g_i2cFid = 3
if (write(g_i2cFid, reg, length+1) != length+1) {
printf("Ultimativ nach write\n\r");
perror("user_i2c_write");
rslt = 1;
exit(1);
}
else
{
printf("Write erfolgreich!\n\r");
}
return rslt;
}
/*
* System specific implementation of sleep function
*
* param[in] t_ms time in milliseconds
*
* return none
*/
void delay_ms(uint32_t t_ms)
{
struct timespec ts;
ts.tv_sec = t_ms / 1000;
/* mod because nsec must be in the range 0 to 999999999 */
ts.tv_nsec = (t_ms % 1000) * 1000000L;
//printf("%lu\n\r", &ts);
nanosleep(&ts, NULL);
}
//////
int main(void)
{
int8_t rslt;
struct bmp280_dev bmp;
struct bmp280_config conf;
struct bmp280_uncomp_data ucomp_data;
int32_t temp32;
double temp;
delay_ms(1000);
// I2C öffnen
i2cOpen();
delay_ms(1000);
// I2C Adresse
i2cSetAddress(0x76);
// ID auslesen
delay_ms(1000);
checkID();
delay_ms(1000);
printf("Nach delay\n\r");
/* Map the delay function pointer with the function responsible for implementing the delay */
bmp.delay_ms = delay_ms;
/* Assign device I2C address based on the status of SDO pin (GND for PRIMARY(0x76) & VDD for SECONDARY(0x77)) */
bmp.dev_id = BMP280_I2C_ADDR_PRIM;
/* Select the interface mode as I2C */
bmp.intf = BMP280_I2C_INTF;
/* Map the I2C read & write function pointer with the functions responsible for I2C bus transfer */
bmp.read = bus_read; //i2c_reg_read;
bmp.write = bus_write; //i2c_reg_write;
/* To enable SPI interface: comment the above 4 lines and uncomment the below 4 lines */
/*
* bmp.dev_id = 0;
* bmp.read = spi_reg_read;
* bmp.write = spi_reg_write;
* bmp.intf = BMP280_SPI_INTF;
*/
printf("Vor checkID()\n\r");
checkID();
rslt = bmp280_init(&bmp);
checkID();
print_rslt(" bmp280_init status", rslt);
printf("Nach bmp280_init\n\r");
checkID();
/* Always read the current settings before writing, especially when
* all the configuration is not modified
*/
printf("Vor bmp280_get_config status\n\r");
rslt = bmp280_get_config(&conf, &bmp);
print_rslt(" bmp280_get_config status", rslt);
printf("Nach bmp280_get_config status\n\r");
/* configuring the temperature oversampling, filter coefficient and output data rate */
/* Overwrite the desired settings */
conf.filter = BMP280_FILTER_COEFF_2;
/* Temperature oversampling set at 4x */
conf.os_temp = BMP280_OS_4X;
/* Pressure over sampling none (disabling pressure measurement) */
conf.os_pres = BMP280_OS_NONE;
/* Setting the output data rate as 1HZ(1000ms) */
conf.odr = BMP280_ODR_1000_MS;
rslt = bmp280_set_config(&conf, &bmp);
print_rslt(" bmp280_set_config status", rslt);
/* Always set the power mode after setting the configuration */
rslt = bmp280_set_power_mode(BMP280_NORMAL_MODE, &bmp);
print_rslt(" bmp280_set_power_mode status", rslt);
while (1)
{
/* Reading the raw data from sensor */
rslt = bmp280_get_uncomp_data(&ucomp_data, &bmp);
/* Getting the 32 bit compensated temperature */
rslt = bmp280_get_comp_temp_32bit(&temp32, ucomp_data.uncomp_temp, &bmp);
/* Getting the compensated temperature as floating point value */
rslt = bmp280_get_comp_temp_double(&temp, ucomp_data.uncomp_temp, &bmp);
printf("UT: %ld, T32: %ld, T: %f \r\n", ucomp_data.uncomp_temp, temp32, temp);
/* Sleep time between measurements = BMP280_ODR_1000_MS */
bmp.delay_ms(5000); //(1000);
}
return 0;
}
/*!
* @brief Function that creates a mandatory delay required in some of the APIs such as "bmg250_soft_reset",
* "bmg250_set_foc", "bmg250_perform_self_test" and so on.
*
* @param[in] period_ms : the required wait time in milliseconds.
* @return void.
*
*/
//// ersetzt durch _sleep
/*!
* @brief Function for writing the sensor's registers through I2C bus.
*
* @param[in] i2c_addr : sensor I2C address.
* @param[in] reg_addr : Register address.
* @param[in] reg_data : Pointer to the data buffer whose value is to be written.
* @param[in] length : No of bytes to write.
*
* @return Status of execution
* @retval 0 -> Success
* @retval >0 -> Failure Info
*
*/
int8_t i2c_reg_write(uint8_t i2c_addr, uint8_t reg_addr, uint8_t *reg_data, uint16_t length)
{
/* Implement the I2C write routine according to the target machine. */
return -1;
}
/*!
* @brief Function for reading the sensor's registers through I2C bus.
*
* @param[in] i2c_addr : Sensor I2C address.
* @param[in] reg_addr : Register address.
* @param[out] reg_data : Pointer to the data buffer to store the read data.
* @param[in] length : No of bytes to read.
*
* @return Status of execution
* @retval 0 -> Success
* @retval >0 -> Failure Info
*
*/
int8_t i2c_reg_read(uint8_t i2c_addr, uint8_t reg_addr, uint8_t *reg_data, uint16_t length)
{
/* Implement the I2C read routine according to the target machine. */
return -1;
}
/*!
* @brief Function for writing the sensor's registers through SPI bus.
*
* @param[in] cs : Chip select to enable the sensor.
* @param[in] reg_addr : Register address.
* @param[in] reg_data : Pointer to the data buffer whose data has to be written.
* @param[in] length : No of bytes to write.
*
* @return Status of execution
* @retval 0 -> Success
* @retval >0 -> Failure Info
*
*/
int8_t spi_reg_write(uint8_t cs, uint8_t reg_addr, uint8_t *reg_data, uint16_t length)
{
/* Implement the SPI write routine according to the target machine. */
return -1;
}
/*!
* @brief Function for reading the sensor's registers through SPI bus.
*
* @param[in] cs : Chip select to enable the sensor.
* @param[in] reg_addr : Register address.
* @param[out] reg_data : Pointer to the data buffer to store the read data.
* @param[in] length : No of bytes to read.
*
* @return Status of execution
* @retval 0 -> Success
* @retval >0 -> Failure Info
*
*/
int8_t spi_reg_read(uint8_t cs, uint8_t reg_addr, uint8_t *reg_data, uint16_t length)
{
/* Implement the SPI read routine according to the target machine. */
return -1;
}
/*!
* @brief Prints the execution status of the APIs.
*
* @param[in] api_name : name of the API whose execution status has to be printed.
* @param[in] rslt : error code returned by the API whose execution status has to be printed.
*
* @return void.
*/
void print_rslt(const char api_name[], int8_t rslt)
{
if (rslt != BMP280_OK)
{
printf("%s\t", api_name);
if (rslt == BMP280_E_NULL_PTR)
{
printf("Error [%d] : Null pointer error\r\n", rslt);
}
else if (rslt == BMP280_E_COMM_FAIL)
{
printf("Error [%d] : Bus communication failed\r\n", rslt);
}
else if (rslt == BMP280_E_IMPLAUS_TEMP)
{
printf("Error [%d] : Invalid Temperature\r\n", rslt);
}
else if (rslt == BMP280_E_DEV_NOT_FOUND)
{
printf("Error [%d] : Device not found\r\n", rslt);
}
else
{
/* For more error codes refer "*_defs.h" */
printf("Error [%d] : Unknown error code\r\n", rslt);
}
}
}