171 lines
3.5 KiB
C
171 lines
3.5 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "bme680.h"
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#include "i2c.h"
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#define DEVICE "/dev/i2c-1"
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#define ADDRESS 0x77
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int i2c_dev_fd;
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int linux_i2c_init (void);
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int linux_i2c_read (uint8_t reg, uint8_t *dst, uint32_t size);
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int linux_i2c_write (uint8_t reg, uint8_t *src, uint32_t size);
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int linux_i2c_deinit (void);
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int main(){
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bme680_t bme680;
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uint8_t mode;
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/* 1. Assign functions for interacting with the device */
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bme680.dev.init = linux_i2c_init;
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bme680.dev.read = linux_i2c_read;
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bme680.dev.write = linux_i2c_write;
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bme680.dev.deinit = linux_i2c_deinit;
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bme680.dev.xfer = NULL;
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/* 2. set the device mode */
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mode = BME680_MODE_FLOAT | BME680_I2C;
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/* BME680_MODE_INT | BME680_SPI; */
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/* 3. initialise device, and check its id */
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if (bme680_init(&bme680, mode) != 0) {
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fprintf(stderr, "bme680_init()\n");
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exit(EXIT_FAILURE);
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}
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/* 4. reset */
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bme680_reset(&bme680);
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/* 5. read calibration parameters from the device and store in memory */
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if (bme680_calibrate(&bme680) != 0) {
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fprintf(stderr, "bme680_calibrate()\n");
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bme680_deinit(&bme680);
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exit(EXIT_FAILURE);
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}
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/* debug */
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bme680_print_calibration(&bme680);
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/* 6. set up device config */
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bme680.cfg.osrs_t = BME680_OVERSAMPLE_16X;
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bme680.cfg.osrs_p = BME680_OVERSAMPLE_16X;
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bme680.cfg.osrs_h = BME680_OVERSAMPLE_8X;
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bme680.cfg.filter = BME680_IIR_COEFF_63;
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/* 7. write config to device and set off conversion */
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if (bme680_start(&bme680) != 0) {
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fprintf(stderr, "bme680_start()\n");
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bme680_deinit(&bme680);
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exit(EXIT_FAILURE);
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}
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/* 8. poll the meas_status register until all scheduled conversions are done */
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if (bme680_poll(&bme680) != 0) {
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fprintf(stderr, "bme680_poll()\n");
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bme680_deinit(&bme680);
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exit(EXIT_FAILURE);
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}
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/* 9. read the ADC's and perform a conversion */
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if (bme680_read(&bme680) != 0) {
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fprintf(stderr, "bme680_read()\n");
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bme680_deinit(&bme680);
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exit(EXIT_FAILURE);
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}
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printf("adc_temp: %d\n", bme680.adc.temp);
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printf("adc_press: %d\n", bme680.adc.press);
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printf("adc_hum: %d\n", bme680.adc.hum);
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/* 10. use data ! */
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if (BME680_IS_FLOAT(bme680.mode)) {
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puts("float mode");
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printf("tfine: %f\n", bme680.fcomp.tfine);
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printf("temp: %f degC\n", bme680.fcomp.temp);
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printf("press: %f Pa\n", bme680.fcomp.press);
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printf("humidity: %f %% RH\n", bme680.fcomp.hum);
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} else {
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puts("integer mode");
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printf("tfine: %d\n", bme680.icomp.tfine);
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printf("temp: %d\n", bme680.icomp.temp);
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printf("press: %d Pa\n", bme680.icomp.press);
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printf("humidity: %d %% RH\n", bme680.icomp.hum);
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}
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bme680_deinit(&bme680);
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return 0;
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}
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// STUBS
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int linux_i2c_init (void) {
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puts("linux_i2c_init");
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int ret = i2c_init(DEVICE, ADDRESS);
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if (ret > 0) {
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i2c_dev_fd = ret;
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return 0;
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}
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return 1;
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}
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int linux_i2c_read (uint8_t reg, uint8_t *dst, uint32_t size) {
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int i;
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int ret;
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printf("linux_i2c_read: %X (%d) [", reg, size);
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ret = i2c_read_reg(i2c_dev_fd, reg, (uint8_t)size, dst);
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if (ret != 0) {
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return -1;
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}
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for(i=0; i<size; i++) {
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printf("%X", dst[i]);
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if (i < (size - 1)) {
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printf(",");
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}
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}
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printf("]\n");
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return 0;
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}
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int linux_i2c_write (uint8_t reg, uint8_t *src, uint32_t size) {
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int i;
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printf("linux_i2c_write: %X (%d) [", reg, size);
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for(i=0; i<size; i++) {
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printf("%X", src[i]);
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if (i < (size - 1)) {
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printf(",");
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}
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}
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printf("]\n");
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if (i2c_write_reg(i2c_dev_fd, reg, *src) != 0) {
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return 1;
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}
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return 0;
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}
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int linux_i2c_deinit (void) {
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puts("linux_i2c_deinit");
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close(i2c_dev_fd);
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return 0;
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}
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