Hi kevinevans :

For `error 0x0`, there is a fix thanks to PR https://github.com/espressif/esp-idf/pull/18100

But for other errors (form_error / stuff_error), it indicate that timing issue on this node, maybe your 2nd device's timing not very accurate, at least not accurate with esp node.

The `sp ...

Thank you for your trying and feedback!

But unfortunately, finally get info from the design team that the ESP32 is true has this issue on chip hardware, it is an old design and can't do any software workaround, we can only:
1. using esp32 spi slave without other devices on bus
2. or like what you ...

Hi, Thank you for your report, and we can reproduce the issue now, it is same as an github issue https://github.com/espressif/esp-idf/issues/8638

Form simply try, there are 2 ways, enable DMA, or reduce MISO pin strength by gpio_set_drive_capability(buscfg.miso_io_num, GPIO_DRIVE_CAP_0);

We'll ...

Hi, for esp32 it use an old design, If you using DMA and actual transaction length (master side) not align to 4 byte, slave can't receive those not aligned bytes.

So for your solution: change PIC master side that transaction length align to 4 bytes, Or not use DMA on esp32 spi slave.

Thanks for ...

啊这，，计划是今年底，年底新版本里面支持，旧的驱动不好改，已经在直接做一套新的了，，，可以再等2个月吗，实在捉急的话11月左右可以先给你补丁去测

I don't know how Arduino implement your transaction, But from your ADC chips datasheet, if you need check the "ack" phases, it seems actually a full-duplex communication, at least in the "cmd-ack" section, means you need perform them in same transaction so that they are same time.
So you shouldn't ...