ATSAMV71N21B DMA with I2S, UART source code example

 

 

Clock domain for I2S 48KHz Clock

 

Yellow is I2S Clock(16bit), Green is 48Khz WS waveform.

 

 

 

unsigned char i=0;

int main(void)

{

       /* Initializes MCU, drivers and middleware */

       atmel_start_init();

       /* enable USART module */

       usart_sync_enable(&USART_0);

       i2s_c_sync_enable(&I2S_0);

       /* Configure DMA channels */

       //Configure_Channel_rx();

       Configure_Channel_tx();

       Configure_Channel_i2s_tx();

       

       //_dma_enable_transaction(CONF_USART_RECEIVE_DMA_CHANNEL, false);

       /* Replace with your application code */

       

       

       /* There will be waveform after init. */

       

       /* Breakpoint and Step over to see wave changes. */

       //i2s_c_sync_set_ws_length(&I2S_0, I2SC_MR_DATALENGTH_32_BITS_Val);

       //i2s_c_sync_set_sck_div(&I2S_0, 16);

              

       string[0] = 'a';

       string[1] = 'b';

       string[2] = 'c';

       string[3] = 'd';

       string[4] = 'e';

       string[5] = 'f';

       string[6] = '0';

       string[7] = '1';

       

       i2s_data[0] = 0xAA;

       i2s_data[1] = 0xAA;

       i2s_data[2] = 0xAA;

       i2s_data[3] = 0xAA;

       i2s_data[4] = 0xAA;

       i2s_data[5] = 0xAA;

       i2s_data[6] = 0xAA;

       i2s_data[7] = 0xAA;

       //I2S_0_example();

       i2s_c_sync_set_ws_length(&I2S_0, I2SC_MR_DATALENGTH_16_BITS_Val);

       i2s_c_sync_set_sck_div(&I2S_0, 16);      

       //i2s_c_sync_write_thr(&I2S_0,0x55555555);

       gpio_toggle_pin_level(LED0);

       

       while (1) {

              //if (transferComplete) {

                     ///* reset source and destination address before re-enabling the channel */

                     //_dma_set_source_address(CONF_USART_RECEIVE_DMA_CHANNEL,

                                             //(uint32_t) & (((Usart *)(USART_0.device.hw))->US_RHR));

                     //_dma_set_destination_address(CONF_USART_RECEIVE_DMA_CHANNEL, (uint32_t *)string);

                     //_dma_set_data_amount(CONF_USART_RECEIVE_DMA_CHANNEL, (uint32_t)BUFFER_LEN);

//

                     //_dma_enable_transaction(CONF_USART_RECEIVE_DMA_CHANNEL, false);

                     //transferComplete = 0;

              //}

              //if (receiveComplete) {

                     /* reset source and destination address before re-enabling the channel */

                     _dma_set_source_address(CONF_USART_TRANSMIT_DMA_CHANNEL, (uint32_t *)string);

                     _dma_set_destination_address(CONF_USART_TRANSMIT_DMA_CHANNEL,

                                                  (uint32_t) & (((Usart *)(USART_0.device.hw))->US_THR));

                     _dma_set_data_amount(CONF_USART_TRANSMIT_DMA_CHANNEL, (uint32_t)BUFFER_LEN);

                     _dma_enable_transaction(CONF_USART_TRANSMIT_DMA_CHANNEL, false);

                     

                     

                     

                     _dma_set_source_address(CONF_I2S_DMA_CHANNEL, (uint32_t *)i2s_data);

                     //_dma_set_destination_address(CONF_I2S_DMA_CHANNEL,(void *)REG_I2SC0_THR);

                     //_dma_set_destination_address(CONF_I2S_DMA_CHANNEL,0x4008C024);

                     _dma_set_destination_address(CONF_I2S_DMA_CHANNEL,(void *const)&REG_I2SC0_THR);

                     //(uint32_t) & (((Usart *)(I2S_0.device.hw))->I2SC_THR));

                     _dma_set_data_amount(CONF_I2S_DMA_CHANNEL, (uint32_t)BUFFER_LEN);

                     _dma_enable_transaction(CONF_I2S_DMA_CHANNEL, false);

                     

                     delay_ms(100);

                     gpio_toggle_pin_level(LED0);

       }

}