I cant get faster SPI performance, in every SPI DMA request mcu receiving 164 bytes of data, the maximum request rate what I got is about 1KHz, total number of bytes is only ~ 164 * 1000 = 164KB, I need to reach 8KHz rate, MCU and other clocks is set to almost maximum values, on STM32H7 MCU with many other tasks I reached without any problems 12KHz rate, with N6 I cant get event near of required transfer speed in any configurations, If I rising request rate I getting SPI busy error, where can be the problem ? What peripherals or other settings is responsible for SPI transfer and interfere there ? I can attach .IOC file or more info.
In my setup SPI requests is controlled by HAL_TIM_PeriodElapsedCallback(), sometimes I need to stop requests in case when synchronization is lost, timer fires function for next SPI DMA transfer and in case of error (in my case I getting SPI busy error) the timer for request is stopped, timer fires simple function:
void nextPacket(){
if (HAL_SPI_Receive_DMA(&hspi5, buff, 164) != HAL_OK) {
HAL_TIM_Base_Stop_IT(&htim16);
printf("Spi E\n");
}
}
There is no difference if I choosing GPDMA1 or HPDMA1, the transfer rate does not reaching more, same is for SPI frequency.
DMA settings:
SPI settings:
