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cpu/esp32: use ESP-IDF i2c HAL for ESP32 periph/i2c #18279

Merged
merged 2 commits into from
Jul 17, 2022
Merged

cpu/esp32: use ESP-IDF i2c HAL for ESP32 periph/i2c #18279

merged 2 commits into from
Jul 17, 2022

Commits on Jul 17, 2022

  1. cpu/esp32: port periph/i2c_hw to ESP-IDF i2c HAL

    @gschorcht
    gschorcht committed Jul 17, 2022
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  2. cpu/esp_common: port periph/i2c_sw with calculated delays 

    Fixed delay values are replaced by calculated delays measured in CPU cycles in I2C software implementation. The advantage is that for each ESP SoC only a clock calibration offset has to be specified. The delay measured in CPU cycles are then then derived from current CPU frequency for the given bus speed. The disadvantage is that the calculated delays are not as precise as the predefined fixed delays.
    @gschorcht
    gschorcht committed Jul 17, 2022
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