Getting I2S Tx and Rx working with DMA (PSOC5)

DaMc_1553781 · ‎Oct 15, 2018

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);
}