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)®_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);
}
}
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