esp-recuperator/main/onewires.c

#include <freertos/FreeRTOS.h>
#include <freertos/task.h>
#include <math.h>
#include <esp_log.h>
#include "onewires.h"
#include "tasks.h"
#include "owb.h"
#include "ds18b20.h"

static const char* TAG="1w";

static owb_rmt_driver_info s_rmt_driver_info[2] = {};
static OneWireBus * sBuses[2] = {};
static DS18B20_Info *sDevs[2] = {};

volatile int16_t gTempSensors[2] = {};
volatile bool tempSensorsOk = false;

static void owtask(void *dummy) {
    while (1) {
        int16_t a = 0, b = 0;
        int rv = read_onewires(&a, &b);
        tempSensorsOk = (rv == 0);

        ESP_LOGI(TAG, "t1 %d, t2 %d Cx10", a, b);
        gTempSensors[0] = a;
        gTempSensors[1] = b;
    }
}

void onewires_setup()
{
    sBuses[0] = owb_rmt_initialize(&s_rmt_driver_info[0], CONFIG_PIN_1WIRE_1, RMT_CHANNEL_1, RMT_CHANNEL_0);
    sBuses[1] = owb_rmt_initialize(&s_rmt_driver_info[1], CONFIG_PIN_1WIRE_2, RMT_CHANNEL_3, RMT_CHANNEL_2);

    for (int i = 0; i < 2; i++) {
        owb_use_crc(sBuses[i], true);
        sDevs[i] = ds18b20_malloc();
        ds18b20_init_solo(sDevs[i], sBuses[i]);
        ds18b20_use_crc(sDevs[i], true);
        ds18b20_set_resolution(sDevs[i], DS18B20_RESOLUTION_12_BIT);
    }

    xTaskCreate(owtask, "1w", ONEWIRES_TASK_STACK, NULL, ONEWIRES_TASK_PRIO, NULL);
}

int read_onewires(int16_t *a, int16_t *b)
{
    for (int i = 0; i < 2; i++) {
        ds18b20_convert_all(sBuses[i]);
    }

    float readings[2] = { 0 };
    DS18B20_ERROR errors[2] = { 0 };

    ds18b20_wait_for_conversion(sDevs[0]);
    vTaskDelay(pdMS_TO_TICKS(10)); // to be sure its done

    for (int i = 0; i < 2; i++) {
        errors[i] = ds18b20_read_temp(sDevs[i], &readings[i]);
    }

    if (errors[0] != DS18B20_OK || errors[1] != DS18B20_OK) {
        return -1;
    }

    *a = (int16_t) roundf(readings[0] * 10);
    *b = (int16_t) roundf(readings[1] * 10);
    return 0;
}