123 lines
3.4 KiB
C
123 lines
3.4 KiB
C
#include <string.h>
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#include <stdio.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "driver/i2c.h"
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#include "bme280.h"
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// pin numbers specific to this TTGO board with TFT screen
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#define SDA_PIN 21
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#define SCL_PIN 22
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int8_t user_i2c_read(uint8_t dev_addr, uint8_t reg_addr, uint8_t *reg_data, uint8_t cnt);
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int8_t user_i2c_write(uint8_t dev_addr, uint8_t reg_addr, uint8_t *reg_data, uint8_t cnt);
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/* int8_t stream_sensor_data_forced_mode(struct bme280_dev *dev); */
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/* int8_t stream_sensor_data_normal_mode(struct bme280_dev *dev); */
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void user_delay_ms(uint32_t ms);
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struct bme280_dev bme280;
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void my_i2c_setup(void)
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{
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i2c_config_t conf;
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conf.mode = I2C_MODE_MASTER;
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conf.sda_io_num = SDA_PIN;
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conf.scl_io_num = SCL_PIN;
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conf.sda_pullup_en = GPIO_PULLUP_ENABLE;
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conf.scl_pullup_en = GPIO_PULLUP_ENABLE;
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conf.master.clk_speed = 20000;
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i2c_param_config(I2C_NUM_0, &conf);
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i2c_driver_install(I2C_NUM_0, I2C_MODE_MASTER, 0, 0, 0);
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}
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void my_bme280_init(void)
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{
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int8_t rslt = BME280_OK;
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uint8_t settings_sel;
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bme280.dev_id = BME280_I2C_ADDR_PRIM;
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bme280.intf = BME280_I2C_INTF;
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bme280.read = (void *)user_i2c_read;
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bme280.write = (void *)user_i2c_write;
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bme280.delay_ms = (void *)user_delay_ms;
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printf("calling bme280_init\r\n");
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rslt = bme280_init(&bme280);
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printf("bme280 init result %d\r\n", rslt);
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bme280.settings.osr_h = BME280_OVERSAMPLING_1X;
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bme280.settings.osr_p = BME280_OVERSAMPLING_4X;
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bme280.settings.osr_t = BME280_OVERSAMPLING_4X;
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bme280.settings.filter = BME280_FILTER_COEFF_OFF;
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settings_sel = BME280_OSR_PRESS_SEL | BME280_OSR_TEMP_SEL | BME280_OSR_HUM_SEL | BME280_FILTER_SEL;
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rslt = bme280_set_sensor_settings(settings_sel, &bme280);
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printf("bme280 settings config result %d\r\n", rslt);
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}
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#define SUCCESS 0
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#define FAIL -1
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#define I2C_MASTER_ACK 0
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#define I2C_MASTER_NACK 1
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int8_t user_i2c_write(uint8_t dev_addr, uint8_t reg_addr, uint8_t *reg_data, uint8_t cnt)
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{
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int32_t iError = 0;
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esp_err_t espRc;
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i2c_cmd_handle_t cmd = i2c_cmd_link_create();
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i2c_master_start(cmd);
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i2c_master_write_byte(cmd, (dev_addr << 1) | I2C_MASTER_WRITE, true);
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i2c_master_write_byte(cmd, reg_addr, true);
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i2c_master_write(cmd, reg_data, cnt, true);
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i2c_master_stop(cmd);
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espRc = i2c_master_cmd_begin(I2C_NUM_0, cmd, 200/portTICK_PERIOD_MS);
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// printf("in user_i2c_read, i2c_master_cmd_begin returns %d\r\n", espRc);
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if (espRc == ESP_OK) {
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iError = SUCCESS;
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} else {
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iError = FAIL;
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}
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i2c_cmd_link_delete(cmd);
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return (int8_t)iError;
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}
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int8_t user_i2c_read(uint8_t dev_addr, uint8_t reg_addr, uint8_t *reg_data, uint8_t cnt)
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{
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int32_t iError = 0;
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esp_err_t espRc;
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i2c_cmd_handle_t cmd = i2c_cmd_link_create();
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i2c_master_start(cmd);
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i2c_master_write_byte(cmd, (dev_addr << 1) | I2C_MASTER_WRITE, true);
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i2c_master_write_byte(cmd, reg_addr, true);
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i2c_master_start(cmd);
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i2c_master_write_byte(cmd, (dev_addr << 1) | I2C_MASTER_READ, true);
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if (cnt > 1) {
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i2c_master_read(cmd, reg_data, cnt-1, I2C_MASTER_ACK);
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}
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i2c_master_read_byte(cmd, reg_data+cnt-1, I2C_MASTER_NACK);
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i2c_master_stop(cmd);
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espRc = i2c_master_cmd_begin(I2C_NUM_0, cmd, 200/portTICK_PERIOD_MS);
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if (espRc == ESP_OK) {
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iError = SUCCESS;
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} else {
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iError = FAIL;
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}
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i2c_cmd_link_delete(cmd);
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return (int8_t)iError;
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}
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void user_delay_ms(uint32_t ms)
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{
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vTaskDelay(ms/portTICK_PERIOD_MS);
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}
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