esp-airsensor/main/periph_init.c

#include <esp_log.h>
#include "periph_init.h"
#include "driver/i2c.h"
#include "data_report.h"

#include <driver/uart.h>

static const char *TAG = "periph_init";

esp_err_t periph_init() {
    esp_err_t rv;

    g_mux_data_report = xSemaphoreCreateMutex(); // XXX move elsewhere
    assert(g_mux_data_report);

    ESP_LOGI(TAG, "Init I2C");

    // VOC i2c
    {
        int i2c_master_port = I2C_NUM_0;
        i2c_config_t conf = {
                .mode = I2C_MODE_MASTER,
                .sda_io_num = CONFIG_PIN_I2C_SDA0,
                .sda_pullup_en = GPIO_PULLUP_ENABLE, // is this enough?
                .scl_io_num = CONFIG_PIN_I2C_SCL0,
                .scl_pullup_en = GPIO_PULLUP_ENABLE,
                .master.clk_speed = 100000,
        };
        rv = i2c_param_config(i2c_master_port, &conf);
        if (rv != ESP_OK) {
            ESP_LOGE(TAG, "Err in i2c_param_config");
            return rv;
        }
        rv = i2c_driver_install(i2c_master_port, conf.mode, 0, 0, 0);
        if (rv != ESP_OK) {
            ESP_LOGE(TAG, "Err in i2c_driver_install");
            return rv;
        }
    }

    // senseair i2c
    {
#if 0
        int i2c_master_port = I2C_NUM_1;
        i2c_config_t conf2 = {
                .mode = I2C_MODE_MASTER,
                .sda_io_num = CONFIG_PIN_I2C_SDA1,
                .sda_pullup_en = GPIO_PULLUP_ENABLE, // is this enough?
                .scl_io_num = CONFIG_PIN_I2C_SCL1,
                .scl_pullup_en = GPIO_PULLUP_ENABLE,
                .master.clk_speed = 100000,
        };
        rv = i2c_param_config(i2c_master_port, &conf2);
        if (rv != ESP_OK) {
            ESP_LOGE(TAG, "Err in i2c_param_config");
            return rv;
        }
        rv = i2c_driver_install(i2c_master_port, conf2.mode, 0, 0, 0);
        if (rv != ESP_OK) {
            ESP_LOGE(TAG, "Err in i2c_driver_install");
            return rv;
        }
#else
        int i2c_co2_port = I2C_NUM_1;

        const uart_config_t uart_config = {
                .baud_rate = 9600,
                .data_bits = UART_DATA_8_BITS,
                .parity = UART_PARITY_DISABLE,
                .stop_bits = UART_STOP_BITS_1,
        .flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
        .source_clk = UART_SCLK_APB,
                //.use_ref_tick = true
        };

        ESP_ERROR_CHECK(uart_driver_install(i2c_co2_port,
            /* rxbuf */ 256, /* txbuf */ 256, /* que */ 0, /* uart que */ NULL, /* alloc flags */ 0));

        ESP_ERROR_CHECK( uart_param_config(i2c_co2_port, &uart_config) );

        ESP_ERROR_CHECK(uart_set_pin(i2c_co2_port,
//                                    CONFIG_PIN_I2C_SCL1,
//                                    CONFIG_PIN_I2C_SDA1,
                                     CONFIG_PIN_I2C_SDA1,
                                     CONFIG_PIN_I2C_SCL1,
                                     UART_PIN_NO_CHANGE,
                                     UART_PIN_NO_CHANGE));
        // Set UART pins(TX, RX, RTS, CTS)
#endif
    }

    // outputs
    {
        gpio_config_t gpioconf = {
            .pin_bit_mask = (1 << CONFIG_PIN_CO2_COMSEL) | (1 << CONFIG_PIN_CO2_EN),
            .mode = GPIO_MODE_OUTPUT,
        };

        rv = gpio_config(&gpioconf);
        if (rv != ESP_OK) {
            ESP_LOGE(TAG, "Err in gpio_config");
            return rv;
        }

        gpio_set_level(CONFIG_PIN_CO2_COMSEL, 1); // low=I2C
        gpio_set_level(CONFIG_PIN_CO2_EN, 1); // active high
    }

    // input
    {
        gpio_config_t gpioconf = {
            .pin_bit_mask = (1 << CONFIG_PIN_CO2_NRDY),
            .mode = GPIO_MODE_INPUT,
            .pull_up_en = 1,
            .pull_down_en = 0,
            .intr_type = GPIO_INTR_DISABLE,
        };

        rv = gpio_config(&gpioconf);
        if (rv != ESP_OK) {
            ESP_LOGE(TAG, "Err in gpio_config");
            return rv;
        }
    }

    return ESP_OK;
}