How to reset SPI using HAL functions using Nucleo - L073RZ

Hi Peter,

Thanks for your replay ...I did find the dma1_force_reset in stm32l4xx_hal_rcc.h but did not find the SPI2_force_reset (?) .....I am new to STM32 anyways, using SPI2 using  (NUCLEO-L073RZ) and HAL functions I can transmit and receive correct most of the times ...STM processor is the slave and an Aardvark is the master (100Khz - 8 bits) not really creating too much traffic, sporadically mostly I leave the system idle for an hour and maybe more but suddenly i see an error and that is affecting the operation.

In the code I am using basic HAL stuff: (Besides the one SPI Have an ADC also using DMA ( running alone in a thread ) and a UART also TX/and RX using DMA (running also alone in a thread - there is very little traffic in UART almost null it is mostly in receive mode waiting for something that can appear every 20 min or so), I assigned the highest priority to the SPI interrupt. for SPI I have:

SPI_HandleTypeDef hspi2;

DMA_HandleTypeDef hdma_spi2_rx;

DMA_HandleTypeDef hdma_spi2_tx;

 MX_SPI2_Init();

void HAL_SPI_TxRxCpltCallback(SPI_HandleTypeDef *hspi2)

{

complete_spi = 1;

}

And in the main program I have a switch to receive and transmit SPI values:

if(HAL_SPI_TransmitReceive_DMA(&hspi2, spi_data_tx, spi_data_rx, 1) != HAL_OK) {

complete_spi = 1;

}

Sometimes the DMA is locked and sometimes I got a wrong value I can detect the wrong value happens ...I wonder if there is some noise (?) I tried to add pull downs to SPI_SCLK, SPI_SS and SPI_MOSI it looks a bit better but the failure is very sporadic and it can happen anytime...problem is when the failure happens only thing I can do is reset the processor to start fresh again so I need to try to implement a mechanism to rest the SPI and continue.. i saw that previous post where some people recommended a method to rest SPI

1. void SPIP_SlaveReStart(SPIP_t* pSPIP) {
2. HAL_SPI_DeInit(pSPIP->hspi); // back to original state
3. // first, we reset the cell (yes!)
4. /*RCC->AHB1RSTR |= 1<<0; // DMA1
5. NOPs(2);
6. RCC->AHB1RSTR &= ~(1<<0);*/
7. NOPs(2);
8. RCC->APB1RSTR1 |= (1<<14);// SPI2
9. NOPs(2);
10. RCC->APB1RSTR1 &= ~(1<<14);
11. SPIP_SlaveConfigureSpi(pSPIP->hspi);
12. SPIP_SlaveConfigureDma(pSPIP->hspi);
13. }

There are some portions commented out (?) not sure what is really needed to rest the SPI but I can do some experiments, I could not find the functions that were not commented out: HAL_RCC_SPI2_FORCE_RESET & HAL_RCC_SPI2_RELEASE_RESET in stm32l4xx_hal_rcc.h and also the last instructions SPIP_SlaveConfigureSpi() and SPIP_SlaveConfigureDma() are they HAL instructions or there are any HAL equivalents to them ? or there is a better way recommended by STM to rest a SPI peripheral and leave it to its initial state ? ..without affecting the rest of the system..

Thanks for your help, time and consideration,

Joe