I try to read data from a DS3231/DS1307 module using a ESP-WROOM-32. I have a working Arduino code snippet which in general does the following:
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#define DS3231_I2C_ADDRESS 0x68 Wire.begin(); Wire.beginTransmission(DS3231_I2C_ADDRESS); Wire.write(0); // set DS3231 register pointer to 00h Wire.endTransmission(); Wire.requestFrom(DS3231_I2C_ADDRESS, 7);
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#define DS3231_ADDR 0x68 // Initialize i2c_config_t conf; conf.mode = I2C_MODE_MASTER; conf.sda_io_num = 21; conf.scl_io_num = 22; conf.sda_pullup_en = GPIO_PULLUP_ENABLE; conf.scl_pullup_en = GPIO_PULLUP_ENABLE; conf.master.clk_speed = 100000; ESP_ERROR_CHECK(i2c_param_config(I2C_NUM_0, &conf)); ESP_ERROR_CHECK(i2c_driver_install(I2C_NUM_0, conf.mode, 0, 0, 0)); // Read data i2c_cmd_handle_t cmd = i2c_cmd_link_create(); ESP_ERROR_CHECK(i2c_master_start(cmd)); ESP_ERROR_CHECK(i2c_master_write_byte(cmd, (DS3231_ADDR << 1) | I2C_MASTER_WRITE, 1 /* expect ack */)); ESP_ERROR_CHECK(i2c_master_write_byte(cmd, 0x0, 1)); ESP_ERROR_CHECK(i2c_master_start(cmd)); ESP_ERROR_CHECK(i2c_master_write_byte(cmd, (DS3231_ADDR << 1) | I2C_MASTER_READ, 1 /* expect ack */)); uint8_t data; ESP_ERROR_CHECK(i2c_master_read(cmd, data, 7, 0)); ESP_ERROR_CHECK(i2c_master_stop(cmd)); ESP_ERROR_CHECK(i2c_master_cmd_begin(I2C_NUM_0, cmd, 1000/portTICK_PERIOD_MS)); i2c_cmd_link_delete(cmd);
I already found this issue: https://github.com/espressif/esp-idf/issues/680 but I am not sure whether it's the same problem because reading the RTC never works for me (even not the first couple of minutes).
Can somewhere else maybe reproduce this issue or give me a hint what's maybe wrong with the IDF code?
Thank you very much in advance.