Development board

[中文]

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.


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