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Hosted Solution (Linux/MCU) with ESP32 (Wi-Fi + BT + BLE)
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Is there any special limitation in ESP32 SPI Slave? #87

Open TreeNewbeer opened 2 years ago

TreeNewbeer commented 2 years ago

A few month ago I ported ESP-Hosted(commit: 0f7ce11) MCU host driver on one MCU communicate with ESP32 and everything goes well. Recent days I updated my ESP-Hosted to latest master branch(commit: 07beeb9) and found that the host MCU could not detected the INIT_EVENT from ESP32, the reason is ESP32 always send 0xff 0x0 0x0 0x0 ... to host MCU after startup. And when I replaced the Slave MCU as ESP32-C3, everything goes well again.

In MCU host driver I found there some "hard delay" inside reset_slave() function, and in the latest master branch the sleep(1) (before generate init event) appeared on Slave driver, so I am a little curious that is there any special limitation in ESP32 SPI Slave?

mantriyogesh commented 2 years ago

Hello @TreeNewbeer,

We much appreciate for evaluating the project since start.

We will look into code for issue you faced and get back to you shortly.

Whitehouse112 commented 2 years ago

Hi everyone, I read the issue posted by @TreeNewbeer and I would like to know is a solution has been found. I'm stuck at the same point: i'm working with an esp32-wroom-32e connected through SPI to a MCU (stm32u575) but i'm unable to get the INIT_EVENT after esp32 startup. I receive only 0xff 0x0 0x0 0x0.... I'm working with esp-hosted (branch ESP-Hosted_MCU_Host, commit: f209c91) on MCU, while esp_hosted_firmware_esp32_spi_v04.bin has been flashed with esptool.py over ESP32.

Thanks

mantriyogesh commented 2 years ago

As a matter of fact, ESP32 have frequency considerations as per mentioned in https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/spi_slave.html#restrictions-and-known-issues.

Any other chipsets like ESP32-C3, ESP32-S2, ESP32-S3 do not have these issues.

This is why ESP32 has differences in IOC files and code as well.

IOC: 'v1' relates to ESP32. (https://github.com/espressif/esp-hosted/tree/ESP-Hosted_MCU_Host/host/stm32/proj)

code: https://github.com/espressif/esp-hosted/blob/ESP-Hosted_MCU_Host/host/stm32/driver/spi/spi_drv.c#L45-L54

mantriyogesh commented 2 years ago

As workaround for now, Issue for @Whitehouse112 is fixed under https://github.com/espressif/esp-hosted/issues/142 with release v0.3 firmware and STM code. @TreeNewbeer Can you please try if that works for you?