howto DSPI EDMA Slave MK64

ulrichriedel — Wed, 14 Jan 2015 08:51:35 GMT

Hello

I tried slave SPI with DMA on MK64 FRDM K64E with the example from 9.4 DSPI Slave Driver

Kinetis SDK v.1.1 API Reference Manual

No data is transfered...

What is wrong?

Thank you

short g_dma_read[128];

short g_dma_write[128];

edma_state_t edmaState;

edma_user_config_t edmaUserConfig;

dspi_edma_slave_state_t dspiEdmaSlaveState;

dspi_edma_slave_user_config_t slaveEdmaUserConfig;

dspi_status_t result;

PORT_HAL_SetMuxMode(PORTD_BASE, 0, kPortMuxAlt2); // PTD0 SPI0_PCS0 CS slave, 1 CLK high 19 CLK low

PORT_HAL_SetMuxMode(PORTD_BASE, 1, kPortMuxAlt2); // PTD1 SPI0_SCK CLK slave with continious 15 MHz clock

PORT_HAL_SetMuxMode(PORTD_BASE, 2, kPortMuxAlt2); // PTD2 SPI0_SOUT

PORT_HAL_SetMuxMode(PORTD_BASE, 3, kPortMuxAlt2); // PTD3 SPI0_SIN

memset(&edmaUserConfig, 0, sizeof(edmaUserConfig));

edmaUserConfig.chnArbitration = kEDMAChnArbitrationRoundrobin;

EDMA_DRV_Init(&edmaState, &edmaUserConfig);

memset(&dspiEdmaSlaveState, 0, sizeof(dspiEdmaSlaveState));

memset(&slaveEdmaUserConfig, 0, sizeof(slaveEdmaUserConfig));

slaveEdmaUserConfig.dataConfig.clkPhase = kDspiClockPhase_FirstEdge;

slaveEdmaUserConfig.dataConfig.clkPolarity = kDspiClockPolarity_ActiveHigh;

slaveEdmaUserConfig.dataConfig.bitsPerFrame = 19;

slaveEdmaUserConfig.dummyPattern = 0;

DSPI_DRV_EdmaSlaveInit(0, &dspiEdmaSlaveState, &slaveEdmaUserConfig); // DSPI0

// g_dma_write, g_dma_read is previously filled with testpattern, to make sure to debug

// make SPI transfer

result = DSPI_DRV_EdmaSlaveTransfer(0, // SPI0

(const uint8_t *) g_dma_write,

(uint8_t *) g_dma_read,

100);

while(kStatus_DSPI_Success != DSPI_DRV_EdmaSlaveGetTransferStatus(0, NULL)) {

__asm(" NOP");

}

Re: howto DSPI EDMA Slave MK64

Alice_Yang — Thu, 15 Jan 2015 06:14:58 GMT

Hi Ulrich,

There are several reasons for no data transfer , firstly , be sure the correct link spi ,

and I suggest only use SPI without DMA test , check whether it can transfer data.

If it can transfer data well, then check the spi-dma project .

Hope it helps

Alice