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#define LOG_LOCAL_LEVEL ESP_LOG_DEBUG |
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#include "co2_sensor.h" |
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#include <esp_log.h> |
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#include <esp_err.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 <sys/time.h> |
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#include <hal/i2c_hal.h> |
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#include "voc_sensor.h" |
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#include "i2c_utils.h" |
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#include "periph_init.h" |
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#include "data_report.h" |
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static const char *TAG = "co2"; |
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#define CO2_ADDR 104 |
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#define CO2_I2C_NUM I2C_NUM_1 |
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#define TIMEOUT_MS 500 |
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// this works, but the bus is fucked up
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bool wake_up() { |
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esp_err_t suc; |
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#define TRY(x) suc=x; if(suc!=ESP_OK) return suc; |
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for (int i = 0; i < 5; i++) { |
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ESP_LOGD(TAG, "Wake up try %d", i); |
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uint8_t dummy; |
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i2c_cmd_handle_t chain; |
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chain = i2c_cmd_link_create(); |
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TRY(i2c_master_start(chain)); |
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TRY(i2c_master_write_byte(chain, (CO2_ADDR << 1) | I2C_MASTER_WRITE, false)); |
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TRY(i2c_master_write_byte(chain, 0x30, false)); |
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TRY(i2c_master_start(chain)); |
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TRY(i2c_master_write_byte(chain, (CO2_ADDR << 1) | I2C_MASTER_READ, false)); // TODO expect ack?
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TRY(i2c_master_read(chain, &dummy, 1, I2C_MASTER_LAST_NACK)); |
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TRY(i2c_master_stop(chain)); |
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i2c_master_cmd_begin(CO2_I2C_NUM, chain, pdMS_TO_TICKS(70)); |
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i2c_cmd_link_delete(chain); |
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chain = i2c_cmd_link_create(); |
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TRY(i2c_master_start(chain)); |
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TRY(i2c_master_write_byte(chain, (CO2_ADDR << 1) | I2C_MASTER_WRITE, false)); |
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TRY(i2c_master_write_byte(chain, 0x30, false)); |
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TRY(i2c_master_start(chain)); |
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TRY(i2c_master_write_byte(chain, (CO2_ADDR << 1) | I2C_MASTER_READ, true)); // TODO expect ack?
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TRY(i2c_master_read(chain, &dummy, 1, I2C_MASTER_LAST_NACK)); |
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TRY(i2c_master_stop(chain)); |
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suc = i2c_master_cmd_begin(CO2_I2C_NUM, chain, pdMS_TO_TICKS(80)); |
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i2c_cmd_link_delete(chain); |
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if (suc == ESP_OK) { |
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ESP_LOGD(TAG, "Woken up at try %d", i); |
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return true; |
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} |
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} |
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ESP_LOGE(TAG, "Fail to wake up"); |
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return false; |
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#undef TRY |
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} |
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static esp_err_t do_reg_read(uint8_t reg_addr, uint8_t *reg_data, uint32_t length, uint32_t timeout_ms) { |
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i2c_cmd_handle_t cmd = i2c_cmd_link_create(); |
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i2c_reg_read(cmd, CO2_ADDR, reg_addr, reg_data, length); |
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esp_err_t ret = i2c_master_cmd_begin(CO2_I2C_NUM, cmd, pdMS_TO_TICKS(TIMEOUT_MS)); |
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i2c_cmd_link_delete(cmd); |
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if (ret != ESP_OK) { |
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ESP_LOGE(TAG, "I2C read error: %s, devaddr %x, reg %d, len %d", esp_err_to_name(ret), CO2_ADDR, reg_addr, length); |
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} |
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ESP_LOG_BUFFER_HEXDUMP(TAG, reg_data, length, ESP_LOG_DEBUG); |
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return ret; |
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} |
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static esp_err_t reg_read(uint8_t reg_addr, uint8_t *reg_data, uint32_t length, uint32_t timeout_ms) { |
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// BaseType_t suc = xSemaphoreTake(g_mux_i2c, pdMS_TO_TICKS(SEMA_TIMEOUT_MS));
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// if (suc != pdPASS) {
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// ESP_LOGE(TAG, "Sema fail");
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// return ESP_ERR_TIMEOUT;
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// }
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if (!wake_up()) { |
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// xSemaphoreGive(g_mux_i2c);
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return ESP_ERR_TIMEOUT; |
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} |
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esp_err_t rv = do_reg_read(reg_addr, reg_data, length, timeout_ms); |
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// xSemaphoreGive(g_mux_i2c);
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// ets_delay_us(12000);
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return rv; |
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} |
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static esp_err_t do_reg_write(uint8_t reg_addr, const uint8_t *reg_data, uint32_t length, uint32_t timeout_ms) { |
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i2c_cmd_handle_t cmd = i2c_cmd_link_create(); |
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i2c_reg_write(cmd, CO2_ADDR, reg_addr, reg_data, length); |
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esp_err_t ret = i2c_master_cmd_begin(CO2_I2C_NUM, cmd, pdMS_TO_TICKS(timeout_ms)); |
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i2c_cmd_link_delete(cmd); |
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if (ret != ESP_OK) { |
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ESP_LOGE(TAG, "I2C write error: %s, devaddr %x, reg %d, len %d", esp_err_to_name(ret), CO2_ADDR, reg_addr, length); |
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} |
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return ret; |
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} |
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static esp_err_t reg_write(uint8_t reg_addr, const uint8_t *reg_data, uint32_t length, uint32_t timeout_ms) { |
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// BaseType_t suc = xSemaphoreTake(g_mux_i2c, pdMS_TO_TICKS(SEMA_TIMEOUT_MS));
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// if (suc != pdPASS) {
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// ESP_LOGE(TAG, "Sema fail");
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// return ESP_ERR_TIMEOUT;
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// }
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if (!wake_up()) { |
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// xSemaphoreGive(g_mux_i2c);
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return ESP_ERR_TIMEOUT; |
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} |
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esp_err_t rv = do_reg_write(reg_addr, reg_data, length, timeout_ms); |
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// xSemaphoreGive(g_mux_i2c);
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// ets_delay_us(12000);
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return rv; |
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} |
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void co2_read_task(void *param) { |
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// i2c is protected by a semaphore inside the driver, no need to worry about it here
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// continuous is the default
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vTaskDelay(pdMS_TO_TICKS(500)); |
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uint8_t pld[] = {0x00, 0x05, 0x00, 0x05}; |
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if (ESP_OK == reg_write(0x96, pld, 4, TIMEOUT_MS)) { |
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ESP_LOGI(TAG, "CO2 init OK"); |
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} |
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bool init_suc = false; |
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vTaskDelay(pdMS_TO_TICKS(250)); |
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while (1) { |
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vTaskDelay(pdMS_TO_TICKS(2000)); |
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uint8_t data[4] = {}; |
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for (int retry = 0; retry < 3; retry++) { |
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if (ESP_OK == reg_read(0x06, data, 4, TIMEOUT_MS)) { |
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uint16_t filtered = (data[0] << 8) | data[1]; |
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uint16_t unfiltered = (data[2] << 8) | data[3]; |
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ESP_LOGI(TAG, "CO2 ppm %d, raw %d", filtered, unfiltered); |
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if (pdPASS == xSemaphoreTake(g_mux_data_report, pdMS_TO_TICKS(750))) { |
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if (filtered > 400 && filtered < 5000) { |
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g_data_report.co2_ppm = (float) filtered; |
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g_data_report.co2_ready = true; |
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g_data_report.co2_timestamp = xTaskGetTickCount(); |
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} else { |
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g_data_report.co2_ready = false; |
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} |
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} |
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xSemaphoreGive(g_mux_data_report); |
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break; |
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} |
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vTaskDelay(pdMS_TO_TICKS(50)); |
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} |
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} |
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} |
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