AM6421: M4 使用PWM、SPI问题

我需要和产品线工程师确认一下。

请看下面e2e工程师的回复。关于第一个问题可能要花些时间，请关注帖子的回复。

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1268995/am6421-timer-spi-edma-on-m4-core

For your third question which is

Shine said:

3. Customer uses interrupt to read SPI (MCSPI_transfer()) every 20us, but it will consume 5~6us, how to improve the speed?

This is one of the most asked question and let me tell you that some delay is expected due to MCSPI Register read operations involved in MCSPI_transfer API.

NOTE: For every transfer we need to reconfigure few parameters like FIFO config, Data Length, Word Length etc.

Moreover, this delay is expected one to ensure proper functioning of the peripheral.

For the second question which is

Shine said:

2. Does the M4 SPI have DMA? 

Please allow me sometime preferably few hours to a day to recheck and confirm on compatibility of DMA for MCU_SPI.

NOTE: Expect the first question to be answered within few business days.

请看下面e2e工程师关于第2个问题的回复。

I believe DMA is not supported for M4 SPI.