Development board¶
How long does it take for the ESP-WROOM-02D module to restart after the reset signal?¶
It will restart when the input level is lower than 0.6 V for more than 200 μs.
According to the schematic of ESP32-LyraT-Mini, the analog output of the ES8311 codec chip is connected to the input of the ES7243 ADC chip. What is the purpose of this?¶
The hardware acquisition circuit of the AEC reference signal simultaneously transmits the DAC output of the Codec (ES8311) to the speaker PA and the ADC (ES7243) AINLP/N, of which the signal collected would be send back to the ESP32 as the reference signal for the AEC algorithm.
When using the ESP32-MINI-1 module, the serial port printed the follows log when powered on. What could be the reason?¶
rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT) invalid header: 0xffffffff invalid header: 0xffffffff invalid header: 0xffffffff invalid header: 0xffffffff invalid header: 0xffffffff invalid header: 0xffffffff invalid header: 0xffffffff invalid header: 0xffffffff ets Jul 29 2019 12:21:46
The reason could be flash is not programmed.
Which GPIO is connected to the RGB LED of the ESP32-S3-DevKitC-1 development board? ————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————
The RGB LED on the ESP32-S3-DevKitC-1 v1.0 development board is connected to GPIO48.
The RGB LED on the ESP32-S3-DevKitC-1 v1.1 development board is connected to GPIO38.
The reason why the ESP32-S3-DevKitC-1 v1.1 development board changed the RGB LED pin to GPIO38 is that the ESP32-S3R8V chip’s VDD_SPI voltage has been set to 1.8 V. Therefore, unlike other GPIOs, GPIO47 and GPIO48 in the VDD_SPI power domain of this chip also operate at 1.8 V.