wiping everything to get exactly what is on the pi
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-183
@@ -1,183 +0,0 @@
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/**
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*
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*/
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#include "bme280/bme280.h"
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <linux/i2c-dev.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <time.h>
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#define IIC_Dev "/dev/i2c-1"
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int file_descriptor; // maybe file descriptor? example had it as 'fd'
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int8_t check_file_exists(const char *filename)
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{
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FILE *file;
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file = fopen(filename, "r");
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if (file != NULL)
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{
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fclose(file);
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return 1;
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}
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return 0;
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}
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void user_delay_ms(uint32_t period)
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{
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usleep(period*1000);
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}
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double celsius_to_fahrenheit(double celsius)
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{
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return (celsius * 1.8) + 32;
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}
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double pascals_to_mbar(double pascals)
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{
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return pascals / 100;
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}
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int8_t user_i2c_read(uint8_t id, uint8_t reg_addr, uint8_t *data, uint16_t len)
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{
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write(file_descriptor, ®_addr, 1);
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read(file_descriptor, data, len);
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return 0;
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}
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int8_t user_i2c_write(uint8_t id, uint8_t reg_addr, uint8_t *data, uint16_t len)
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{
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int8_t *buf;
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buf = malloc(len +1);
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buf[0] = reg_addr;
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memcpy(buf +1, data, len);
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write(file_descriptor, buf, len +1);
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free(buf);
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return 0;
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}
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void print_sensor_data(struct bme280_data *sensor_readings_data)
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{
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#ifdef BME280_FLOAT_ENABLE
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double fahrenheit = celsius_to_fahrenheit(sensor_readings_data->temperature);
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double celsius = sensor_readings_data->temperature;
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double pascals = sensor_readings_data->pressure;
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double millibars = pascals_to_mbar(sensor_readings_data->pressure);
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double humidity = sensor_readings_data->humidity;
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printf("%0.2f\xc2\xb0\x46 / %0.2f\xc2\xb0\x43, %0.2fPa, %0.2fmbar, %0.2f%% \r\n", fahrenheit, celsius, pascals, millibars, humidity);
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#else
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uint32_t fahrenheit = celsius_to_fahrenheit(sensor_readings_data->temperature);
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uint32_t celsius = sensor_readings_data->temperature;
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uint32_t pascals = sensor_readings_data->pressure;
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uint32_t millibars = pascals_to_mbar(sensor_readings_data->pressure);
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uint32_t humidity = sensor_readings_data->humidity;
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printf("%ld\xc2\xb0\x46 / %ld\xc2\xb0\x43, %ldPa, %ldmbar, %ld%% \r\n", fahrenheit, celsius, pascals, millibars, humidity);
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#endif
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}
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int8_t save_data_to_csv_file(struct bme280_data *sensor_readings_data)
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{
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time_t rawtime = time(NULL);
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struct tm *timeinfo;
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char dateString[32];
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char datetimeString[32];
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char filename[100];
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FILE *csvFilePtr;
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double celsius = sensor_readings_data->temperature;
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double fahrenheit = celsius_to_fahrenheit(sensor_readings_data->temperature);
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double pascals = sensor_readings_data->pressure;
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double millibars = pascals_to_mbar(sensor_readings_data->pressure);
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double humidity = sensor_readings_data->humidity;
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timeinfo = localtime(&rawtime);
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strftime(dateString, 32, "%F", timeinfo);
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strftime(datetimeString, 32, "%F %H:%M:%S", timeinfo);
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snprintf(filename, sizeof(filename), "/home/pi/readings/readings_%s.csv", dateString);
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if (!check_file_exists(filename))
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{
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printf("File for today does not exist! Creating... \n");
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FILE *csvFile = fopen(filename, "w");
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fputs("Date,Celsius,Fahrenheit,Pascals,Millibars,Humidity Percent\n", csvFile);
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fclose(csvFile);
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}
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csvFilePtr = fopen(filename, "a");
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if (csvFilePtr == NULL)
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{
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printf("Failed to open %s for writing...\n", filename);
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exit(1);
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}
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fprintf(csvFilePtr, "%s,%0.5f,%0.5f,%0.5f,%0.5f,%0.5f\n", datetimeString, celsius, fahrenheit, pascals, millibars, humidity);
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fclose(csvFilePtr);
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return 0;
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}
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int8_t read_sensor_data_normal_mode(struct bme280_dev *dev)
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{
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int8_t readings_result;
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uint8_t settings_sel;
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struct bme280_data sensor_readings_data;
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/* Recommended mode of operation: Indoor navigation */
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dev->settings.osr_h = BME280_OVERSAMPLING_1X;
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dev->settings.osr_p = BME280_OVERSAMPLING_16X;
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dev->settings.osr_t = BME280_OVERSAMPLING_2X;
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dev->settings.filter = BME280_FILTER_COEFF_16;
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dev->settings.standby_time = BME280_STANDBY_TIME_62_5_MS;
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settings_sel = BME280_OSR_PRESS_SEL;
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settings_sel |= BME280_OSR_TEMP_SEL;
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settings_sel |= BME280_OSR_HUM_SEL;
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settings_sel |= BME280_STANDBY_SEL;
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settings_sel |= BME280_FILTER_SEL;
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readings_result = bme280_set_sensor_settings(settings_sel, dev);
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readings_result = bme280_set_sensor_mode(BME280_NORMAL_MODE, dev);
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readings_result = bme280_get_sensor_data(BME280_ALL, &sensor_readings_data, dev);
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//print_sensor_data(&sensor_readings_data);
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save_data_to_csv_file(&sensor_readings_data);
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return readings_result;
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}
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int main(int argc, char* argv[])
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{
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struct bme280_dev dev;
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int8_t init_result = BME280_OK;
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if ((file_descriptor = open(IIC_Dev, O_RDWR)) < 0) {
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printf("Failed to open the i2c bus %s", argv[1]);
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exit(1);
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}
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if (ioctl(file_descriptor, I2C_SLAVE, 0x76) < 0) {
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printf("Failed to acquire bus access and/or talk to slave.\n");
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exit(1);
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}
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dev.dev_id = BME280_I2C_ADDR_PRIM; //0x76
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//dev.dev_id = BME280_I2C_ADDR_SEC; //0x77
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dev.intf = BME280_I2C_INTF;
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dev.read = user_i2c_read;
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dev.write = user_i2c_write;
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dev.delay_ms = user_delay_ms;
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init_result = bme280_init(&dev);
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printf("\n\nBME280 Init Result is: %d\n\n", init_result);
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read_sensor_data_normal_mode(&dev);
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printf("Recorded readings.\n\n");
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return 0;
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}
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