SPI Triggered by GPIO

Asaf — Thu, 15 Feb 2024 16:50:50 GMT

Hi,

my device is MK64FN1m0xxx12.

i try to configue SPI2 triggered by GPIOC pin 15 with SPI2 Rx and Tx DMA.

I configure as follow:

#define ADS1299_SPI_CHANNEL (SPI_CH_2)

#define ADS1299_CONFIGURATION_BAUD (1000000)

#define ADS1299_SAMPLING_BAUD (8000000)

#define ADS1299_MAX_BYTE_IN_FRAME (27)

#define ADS1299_MAX_FRAME (64)

#define ADS1299_MAX_BYTE_IN_PACKET (MAX_BYTE_IN_FRAME * MAX_FRAME)

#define ADS1299_MAX_SAMPLE_IN_PACKET (MAX_BYTE_IN_PACKET / 3)

#define ADS1299_MAX_PACKET_TCD_POOL (ADS1299_MAX_FRAME)

#define ADS1299_MAX_BYTE_IN_BLOCK (ADS1299_MAX_BYTE_IN_FRAME)

#define ADS1299_MAX_SAMPLE_PACKET (2)

#define ADS1299_MAX_SPI_TCD_POOL (ADS1299_MAX_SAMPLE_PACKET * ADS1299_MAX_PACKET_TCD_POOL)

U8 SampleBlock[2][64 * 27] ;

SPI_CH_2

edma_handle_t Rx ;

edma_handle_t Tx ;

edma_transfer_config_t TxTransferConfig = {0};

edma_transfer_config_t RxTransferConfig = {0};

AT_QUICKACCESS_SECTION_DATA_ALIGN( edma_tcd_t Tcd_SpiTxMemoryPool[ADS1299_MAX_SPI_TCD_POOL + 1] , sizeof(edma_tcd_t) );

AT_QUICKACCESS_SECTION_DATA_ALIGN( edma_tcd_t Tcd_SpiRxMemoryPool[ADS1299_MAX_SPI_TCD_POOL + 1] , sizeof(edma_tcd_t) );

//Code //

DMAMUX_SetSource ( DMAMUX0, 11, kDmaRequestMux0PortC );

DMAMUX_EnableChannel ( DMAMUX0, 11 );

EDMA_CreateHandle ( &Tx, DMA0, 11 );

EDMA_ResetChannel ( DMA0, 11 );

DMAMUX_SetSource ( DMAMUX0, 9, kDmaRequestMux0SPI2 );

DMAMUX_EnableChannel ( DMAMUX0, 9 );

EDMA_CreateHandle ( &Rx, DMA0, 9 );

EDMA_ResetChannel ( DMA0, 9 );

EDMA_SetCallback ( &Rx, DMACallback, NULL );

U8 NextIndex = 0 ;

U8 TcdPoolForMemory = ADS1299_MAX_FRAME ; //8 / 2 double buffer

U8 TcdMemoryPoolIndex = 0 ;

U8 MemporyPoolIndex = 0 ;

U8 MemoryForPoolSize = ADS1299_MAX_BYTE_IN_FRAME ;

for( U8 i = 0 ; i < 2 ; i++ ){

if( NextIndex + 1 >= 2 )NextIndex = 0 ;

else NextIndex++ ;

EDMA_PrepareTransfer ( pSPITxTransferConfig , SampleBlock + MemoryForPoolSize * i , 1 , &SPI2->PUSHR ,

1 , 1 , MemoryForPoolSize , kEDMA_MemoryToPeripheral );

EDMA_TcdSetTransferConfig ( &Tcd_SpiTxMemoryPool[i], pSPITxTransferConfig, &Tcd_SpiTxMemoryPool[NextIndex] );

EDMA_PrepareTransfer ( pSPIRxTransferConfig, &SPI2->POPR, 1 , SampleBlock + MemoryForPoolSize * i ,

1 , 1, MemoryForPoolSize , kEDMA_PeripheralToMemory );

EDMA_TcdSetTransferConfig ( &Tcd_SpiRxMemoryPool[i], pSPIRxTransferConfig, &Tcd_SpiRxMemoryPool[NextIndex] );

if( (++TcdMemoryPoolIndex != 0) && !(TcdMemoryPoolIndex % TcdPoolForMemory) ){

EDMA_TcdEnableInterrupts( &Tcd_SpiRxMemoryPool[i], kEDMA_MajorInterruptEnable ) ;

TcdMemoryPoolIndex = 0 ;

MemporyPoolIndex++ ;

}

EDMA_InstallTCD ( DMA0, 11, &Tcd_SpiTxMemoryPool[0] );

EDMA_StartTransfer ( &Tx );

EDMA_InstallTCD ( DMA0, 9, &Tcd_SpiRxMemoryPool[0] );

EDMA_StartTransfer ( &Rx );

what im doing wrong?

advice

Re: SPI Triggered by GPIO

Asaf — Thu, 15 Feb 2024 16:53:37 GMT

more detiles i get data ready GPIOC pin 15 foling hadge and then i need to read 27 bytes.

i have two buffers each buffer size of 64 * 27

each tcd read 27 bytes i have 64 tcd for each buffer

Re: SPI Triggered by GPIO

Ricardo_Zamora — Wed, 21 Feb 2024 17:52:53 GMT

Hello,

I would recommend taking as a base the edma_b2b_transfer SDK example. You can take it as a base, but modify it to meet your requirements.

I apologize, but we do not have an example that fits your requirements. The customization of the example should be done by each customer.

Also, maybe this community post might be helpful: Using the DMA module in Kinetis Devices - NXP Community

Regards,

Ricardo

Re: SPI Triggered by GPIO

Asaf — Fri, 23 Feb 2024 09:13:30 GMT

I didnt found example of gpio trigger dma that work on k64fn1m0xxx12

i will be glad for real example for gpio trigger dma for spi2

Advice thanks

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