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espressif / esp-idf

Espressif IoT Development Framework. Official development framework for Espressif SoCs.
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ESP32S3: SPI bus not working after isolating SPI bus lines during deep sleep (IDFGH-7557) #9118

Open samvangysegem opened 2 years ago

samvangysegem commented 2 years ago

Environment

Problem Description

During first startup, the node is able to communicate with external devices over SPI which is validated with an oscilloscope. After going to deep sleep, at which time the SPI bus signals (CLK, MISO and MOSI) are isolated using the rtc_gpio_init and rtc_gpio_isolate commands, and waking up, at which time the rtc_gpio_deinit method is called for the respective SPI bus signals, communication over the SPI bus is no longer working. The SPI bus initialisation using spi_bus_initialize is successful, as is adding devices using spi_bus_add_device. Reading or writing to or from the SPI bus is not working however, which is confirmed by an oscilloscope monitoring the SPI bus signals: neither CLK, MISO or MOSI go to 3V3 when the bus is initialised after deep sleep but all remain fixed a 0V. This problem does not occur when the SPI bus signals are not isolated during deep sleep. Hence, I believe the problem is related to the rtc_gpio_deinit command.

Steps to reproduce

  1. Isolate the signals of the SPI bus using the rtc_gpio_init and rtc_gpio_isolate commands (GPIO 11, 12 and 13 in case of the ESP32S3)
  2. Enter deep sleep and wake back up (timer wakeup)
  3. Call the rtc_gpio_deinit method for the corresponding SPI bus signals
  4. Initialise the SPI bus and add a device
  5. Write to the device (point of failure)

Debug Logs

There are no specific debug logs since SPI bus initialisation and adding devices does not produce any errors. The failure of communication is recognised through the oscilloscope when reading registers from external devices does not lead to any monitored activity on the SPI bus.

samvangysegem commented 2 years ago

Any updates on this issue?

ahne6000 commented 2 years ago

Hi @samvangysegem, I could fix the same issue calling both rtc_gpio_deinit and rtc_gpio_hold_dis. Not quite sure if it's a bug or a missing bit in the espressif docs tho

skip-dt commented 2 years ago

@ahne6000 Thanks for posting this!! It fixed my problem as well. I had been pulling what little is left of my hair out...

wolfstrassen commented 1 year ago

Hi @samvangysegem, I could fix the same issue calling both rtc_gpio_deinit and rtc_gpio_hold_dis. Not quite sure if it's a bug or a missing bit in the espressif docs tho

Thanks for this, I was having a similar problem with I2C pins with ESP-IDF 5.0.1, this solved it.