I'm using the SPI peripheral as a slave in QPI mode. By default, the ADDR phase is 1-byte and DUMMY is 2 bytes, both in 4-bit mode, for a total of 6 SPI Clock periods. This is as per the datasheet (Table 138, Section 24.5.3 GP-SPI2 Slave Mode Single Transfer) and also matches my observations (e.g. i...

ESP_Sprite wrote: ↑

Mon Mar 07, 2022 8:03 am

Digital team says you can get around the limit by setting up segmented transfers, and having the segments to be >2MiB (ref trm section 24.5.4. Perhaps that's a feasible workaround?

Great, thanks! I'll give it a try.

I'm using the ESP32S2 and would like to write a continuous stream of data out of the SPI peripheral. I'm using DMA mode with some circular linked lists to achieve high data volumes. However, after 2MB, the ESP32S2 only shifts out 0xFF values despite the hardware appearing to work as expected. I note...

I went looking for an example of using the QuadSPI on the ESP32S2 in slave mode and couldn't find one. So I wrote one and am sharing it case anyone in the future goes down this road: https://gitlab.com/kevinwolfe/esp32s2_qspi All source code is in a single file: ./main/main.c Test script included: ....

Does anyone have a simple example of getting the SPI module to dance using just the HAL or LL layers? Ideally, master mode with interrupts, but I'll take what I can get. Context: I'm looking to utilize the ESP32S2's SPI peripheral but the IDF drivers have way too many RTOS calls and protections. The...

Solved!
Two things:
1) Forgot to set 2) Looks like UART1 & USB share an interrupt. You need to set in the call to uart_driver_install()

EDIT: Deleted, solved issue, see below.

EDIT: Solved, see below.

I can't get UART1 & USB working simultaneously. Does the USB HCI use UART1? If so, I can't find anything in the documentation indicating that.

Last post on this topic. Got it working, requires rx_dma_equal = 1. I'm not super confident of the meaning of this register, but there ya go. Good luck to any that stray here from the future. #include "driver/gpio.h" #include "driver/i2s.h" #include "driver/ledc.h" #include "driver/periph_ctrl.h" #i...

Fully self contained example of my error below. This generates bit clock (2 MHz), data clock (1 MHz), a pulse on the word-clk to start data flowing, and outputs the DMA buffer to show the error. Grrr...

EDIT: Code removed, see later posts in this thread for a more up-to-date version.