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PSoC 5, 3 & 1 MCU

New Contributor II

Hi all!

I'm having some bother with the DMA and understanding a few concepts. I've spent most of the weekend on this and can not get it working so turning to the trusted sages on here.

Basically I want to read in some 16bit values to , do something with them and pass them out again. So far I only have the Tx working with some sine wave test data but it would make my week if I could just pass Rx to Tx! I have the I2S block and DMA_1_ is connected to the Tx_DMA and DMA_2 to the Rx_DMA.

Thanks in advanced, code below.

#include "project.h"

void DmaTxConfiguration(void);

void DmaRxConfiguration(void);

#define DMA_1_BYTES_PER_BURST 1

#define DMA_1_REQUEST_PER_BURST 1

#define DMA_1_SRC_BASE (CYDEV_SRAM_BASE)

#define DMA_1_DST_BASE (CYDEV_PERIPH_BASE)

/* DMA Configuration for RxDMA */

#define DMA_2_BYTES_PER_BURST       (1)

#define DMA_2_REQUEST_PER_BURST     (1)

#define DMA_2_SRC_BASE              (CYDEV_PERIPH_BASE)

#define DMA_2_DST_BASE              (CYDEV_SRAM_BASE)

#define LEN 101

int16_t inData[LEN];

int16_t outData[LEN];

int main(void)

{

    CyGlobalIntEnable; /* Enable global interrupts. */

    Clock_1_Start();

    I2S_1_Start();

    I2C_1_Start();

    isr_1_Start();

   

    ADC_DelSig_1_Start();

    codecConfig();

    ADC_DelSig_1_StartConvert();

   

    DmaTxConfiguration();

    DmaRxConfiguration();

   

    I2S_1_EnableRx();

      

    while(0u != (I2S_1_ReadTxStatus() & I2S_1_TX_FIFO_0_NOT_FULL))

    {/*wait*/}

    I2S_1_EnableTx();   /* Enable Tx direction */

   

    for(;;);

}

void DmaTxConfiguration(void)

{

    uint8 TxDMA_Chan;

    uint8 TxDMA_TD[1u];   

    TxDMA_Chan = DMA_1_DmaInitialize(DMA_1_BYTES_PER_BURST, DMA_1_REQUEST_PER_BURST, HI16(DMA_1_SRC_BASE), HI16(DMA_1_DST_BASE));

    TxDMA_TD[0u] = CyDmaTdAllocate();

     

    CyDmaTdSetConfiguration(TxDMA_TD[0u],LEN, TxDMA_TD[0u], CY_DMA_TD_INC_SRC_ADR);

    CyDmaTdSetAddress(TxDMA_TD[0u], LO16((uint32)inData), LO16((uint32)I2S_1_TX_CH0_F0_PTR));

    CyDmaChSetInitialTd(TxDMA_Chan, TxDMA_TD[0u]);

    CyDmaChEnable(TxDMA_Chan, 1u);

}

void DmaRxConfiguration(void)

{

    uint8 RxDMA_Chan;

    uint8 RxDMA_TD[1u];   

    RxDMA_Chan = DMA_2_DmaInitialize(DMA_2_BYTES_PER_BURST, DMA_2_REQUEST_PER_BURST, HI16(DMA_2_SRC_BASE), HI16(DMA_2_DST_BASE));

    RxDMA_TD[0u] = CyDmaTdAllocate();

     

    CyDmaTdSetConfiguration(RxDMA_TD[0u],LEN, RxDMA_TD[0u], CY_DMA_TD_INC_DST_ADR);

    CyDmaTdSetAddress(RxDMA_TD[0u], LO16((uint32)I2S_1_RX_CH0_F0_PTR), LO16((uint32)outData));

    CyDmaChSetInitialTd(RxDMA_Chan, RxDMA_TD[0u]);

    CyDmaChEnable(RxDMA_Chan, 1u);

}

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