/**
* \brief DMAC tx channel configuration.
*/
static void configure_dmac_tx(void)
{
uint32_t ul_cfg;
dma_transfer_descriptor_t dmac_trans;
ul_cfg = 0;
ul_cfg |= DMAC_CFG_DST_PER(USART_TX_IDX) |
DMAC_CFG_DST_H2SEL |
DMAC_CFG_SOD_ENABLE | DMAC_CFG_FIFOCFG_ALAP_CFG;
dmac_channel_set_configuration(DMAC, BOARD_USART_DMAC_TX_CH, ul_cfg);
dmac_channel_disable(DMAC, BOARD_USART_DMAC_TX_CH);
dmac_trans.ul_source_addr = (uint32_t) gs_puc_buffer;
dmac_trans.ul_destination_addr = (uint32_t) & BOARD_USART->US_THR;
dmac_trans.ul_ctrlA =
DMAC_CTRLA_BTSIZE(BUFFER_SIZE) |
DMAC_CTRLA_SRC_WIDTH_BYTE | DMAC_CTRLA_DST_WIDTH_BYTE;
dmac_trans.ul_ctrlB =
DMAC_CTRLB_SRC_DSCR | DMAC_CTRLB_DST_DSCR |
DMAC_CTRLB_FC_MEM2PER_DMA_FC |
DMAC_CTRLB_SRC_INCR_INCREMENTING |
DMAC_CTRLB_DST_INCR_FIXED;
dmac_trans.ul_descriptor_addr = 0;
dmac_channel_single_buf_transfer_init(DMAC, BOARD_USART_DMAC_TX_CH,
&dmac_trans);
dmac_channel_enable(DMAC, BOARD_USART_DMAC_TX_CH);
}
/**
* \brief Start DMA sending data.
*
* \param p_buffer Pointer to the data to be transmitted.
* \param us_size Size of the data to be transmitted.
*/
static void ssc_dma(void *p_buffer, uint16_t us_size)
{
dma_transfer_descriptor_t desc;
desc.ul_source_addr = (uint32_t)p_buffer;
desc.ul_destination_addr = (uint32_t)(&SSC->SSC_THR);
desc.ul_ctrlA = DMAC_CTRLA_BTSIZE(us_size)
| DMAC_CTRLA_SRC_WIDTH_HALF_WORD
| DMAC_CTRLA_DST_WIDTH_HALF_WORD;
desc.ul_ctrlB = DMAC_CTRLB_SRC_DSCR_FETCH_DISABLE
| DMAC_CTRLB_DST_DSCR_FETCH_DISABLE
| DMAC_CTRLB_FC_MEM2PER_DMA_FC
| DMAC_CTRLB_SRC_INCR_INCREMENTING
| DMAC_CTRLB_DST_INCR_FIXED
| DMAC_CTRLB_IEN;
desc.ul_descriptor_addr = NULL;
dmac_channel_single_buf_transfer_init(DMAC, DMA_CH, &desc);
/* Start DMA transfer */
dmac_channel_enable(DMAC, DMA_CH);
/* Enable SSC transmitter */
ssc_enable_tx(SSC);
}
/**
* \brief Set DMAC buffer transfer size used by a DMAC channel.
*
* \param pDmac Pointer to the DMAC peripheral.
* \param channel Particular channel number.
* \param bsize number of transfers to be performed.
*/
void DMAC_SetBufferSize( Dmac *pDmac,
uint8_t channel,
uint16_t bsize)
{
assert(pDmac);
assert(channel < DMAC_CHANNEL_NUM);
pDmac->DMAC_CH_NUM[channel].DMAC_CTRLA &= ~DMAC_CTRLA_BTSIZE_Msk;
pDmac->DMAC_CH_NUM[channel].DMAC_CTRLA |= DMAC_CTRLA_BTSIZE( bsize );
}
/**
* \brief Test DMA single buffer transfer with polling mode.
*
* \param test Current test case.
*/
static void run_single_buf_xfer_test(const struct test_case *test)
{
uint32_t i;
uint32_t cfg;
dma_transfer_descriptor_t desc;
/* Initialize DMA buffer */
for (i = 0; i < DMA_BUF_SIZE; i++) {
g_dma_buf[0][i] = i;
g_dma_buf[1][i] = 0;
}
/* Initialize and enable DMA controller */
pmc_enable_periph_clk(ID_DMAC);
dmac_init(DMAC);
dmac_set_priority_mode(DMAC, DMAC_PRIORITY_ROUND_ROBIN);
dmac_enable(DMAC);
/* Set for channel configuration register */
cfg = DMAC_CFG_SOD_ENABLE | /* Enable stop on done */
DMAC_CFG_AHB_PROT(1) | /* Set AHB Protection */
DMAC_CFG_FIFOCFG_ALAP_CFG; /* FIFO Configuration */
dmac_channel_set_configuration(DMAC, DMA_CH, cfg);
/* Initialize single buffer transfer: buffer 0 -> buffer 1 */
desc.ul_source_addr = (uint32_t) g_dma_buf[0];
desc.ul_destination_addr = (uint32_t) g_dma_buf[1];
desc.ul_ctrlA = DMAC_CTRLA_BTSIZE(DMA_BUF_SIZE) | /* Set Buffer Transfer Size */
DMAC_CTRLA_SRC_WIDTH_WORD | /* Source transfer size is set to 32-bit width */
DMAC_CTRLA_DST_WIDTH_WORD; /* Destination transfer size is set to 32-bit width */
desc.ul_ctrlB = DMAC_CTRLB_SRC_DSCR_FETCH_DISABLE | /* Buffer Descriptor Fetch operation is disabled for the source */
DMAC_CTRLB_DST_DSCR_FETCH_DISABLE | /* Buffer Descriptor Fetch operation is disabled for the destination */
DMAC_CTRLB_FC_MEM2MEM_DMA_FC | /* Memory-to-Memory Transfer */
DMAC_CTRLB_SRC_INCR_INCREMENTING | /* The source address is incremented */
DMAC_CTRLB_DST_INCR_INCREMENTING; /* The destination address is incremented */
desc.ul_descriptor_addr = 0; /* No descriptor for single transfer */
dmac_channel_single_buf_transfer_init(DMAC, DMA_CH, &desc);
/* Start DMA transfer and wait for finish */
dmac_channel_enable(DMAC, DMA_CH);
while (!dmac_channel_is_transfer_done(DMAC, DMA_CH)) {
}
/* Verify the transferred data */
for (i = 0; i < DMA_BUF_SIZE; i++) {
test_assert_true(test, g_dma_buf[0][i] == g_dma_buf[1][i],
"Data comparison failed.");
}
}
void spi_start_transmit_dma(Dmac *p_dmac, Spi *p_spi, uint32_t ul_num,
const void *src, uint32_t nb_bytes)
{
static uint8_t ff = 0xFF;
uint32_t cfg, src_incr = DMAC_CTRLB_SRC_INCR_INCREMENTING;
dma_transfer_descriptor_t desc;
// Send 0xFF repeatedly if src is NULL
if (!src) {
src = &ff;
src_incr = DMAC_CTRLB_SRC_INCR_FIXED;
}
// Disable the DMA channel prior to configuring
dmac_enable(p_dmac);
dmac_channel_disable(p_dmac, ul_num);
cfg = DMAC_CFG_SOD
| DMAC_CFG_DST_H2SEL
| DMAC_CFG_DST_PER(SPI_TX_IDX)
| DMAC_CFG_FIFOCFG_ALAP_CFG;
dmac_channel_set_configuration(p_dmac, ul_num, cfg);
// Prepare DMA transfer
desc.ul_source_addr = (uint32_t)src;
desc.ul_destination_addr = (uint32_t)&(p_spi->SPI_TDR);
desc.ul_ctrlA = DMAC_CTRLA_BTSIZE(nb_bytes)
| DMAC_CTRLA_SRC_WIDTH_BYTE
| DMAC_CTRLA_DST_WIDTH_BYTE;
desc.ul_ctrlB = DMAC_CTRLB_SRC_DSCR
| DMAC_CTRLB_DST_DSCR
| DMAC_CTRLB_FC_MEM2PER_DMA_FC
| src_incr
| DMAC_CTRLB_DST_INCR_FIXED;
// Next field is ignored, but set it anyway
desc.ul_descriptor_addr = (uint32_t)NULL;
// Finish configuring the transfer
dmac_channel_single_buf_transfer_init(p_dmac, ul_num, &desc);
// And now start the DMA transfer
dmac_channel_enable(p_dmac, ul_num);
}
void spi_start_receive_dma(Dmac *p_dmac, Spi *p_spi, uint32_t ul_num,
const void *dest, uint32_t nb_bytes)
{
uint32_t cfg;
dma_transfer_descriptor_t desc;
// clear any potential overrun error
cfg = p_spi->SPI_SR;
// Turn the DMA channel off before configuring
dmac_enable(p_dmac);
dmac_channel_disable(p_dmac, ul_num);
cfg = DMAC_CFG_SOD
| DMAC_CFG_SRC_H2SEL
| DMAC_CFG_SRC_PER(SPI_RX_IDX)
| DMAC_CFG_FIFOCFG_ASAP_CFG;
dmac_channel_set_configuration(p_dmac, ul_num, cfg);
// Prepare DMA transfer
desc.ul_source_addr = (uint32_t)&(p_spi->SPI_RDR);
desc.ul_destination_addr = (uint32_t)dest;
desc.ul_ctrlA = DMAC_CTRLA_BTSIZE(nb_bytes)
| DMAC_CTRLA_SRC_WIDTH_BYTE
| DMAC_CTRLA_DST_WIDTH_BYTE;
desc.ul_ctrlB = DMAC_CTRLB_SRC_DSCR
| DMAC_CTRLB_DST_DSCR
| DMAC_CTRLB_FC_PER2MEM_DMA_FC
| DMAC_CTRLB_SRC_INCR_FIXED
| DMAC_CTRLB_DST_INCR_INCREMENTING;
// This next field is ignored but set it anyway
desc.ul_descriptor_addr = (uint32_t)NULL;
// Finish configuring the DMA transfer
dmac_channel_single_buf_transfer_init(p_dmac, ul_num, &desc);
// And now allow the DMA transfer to begin
dmac_channel_enable(p_dmac, ul_num);
}
void ledUpdate(void){
volatile uint16_t* row_data;
unsigned i;
gpioSetVal(blanks[row], 1);
if(++row == NUM_ROWS) row = 0;
row_data = led_buffer + XFERS_PER_ROW * row;
DMAC->DMAC_CH_NUM[DMA_CHANNEL_LEDS].DMAC_SADDR = (uint32_t)row_data;
DMAC->DMAC_CH_NUM[DMA_CHANNEL_LEDS].DMAC_DADDR = (uint32_t)&SPI0->SPI_TDR;
DMAC->DMAC_CH_NUM[DMA_CHANNEL_LEDS].DMAC_DSCR = 0;
DMAC->DMAC_CH_NUM[DMA_CHANNEL_LEDS].DMAC_CTRLA = DMAC_CTRLA_BTSIZE(XFERS_PER_ROW) | DMAC_CTRLA_SCSIZE_CHK_16 | DMAC_CTRLA_DCSIZE_CHK_1 | DMAC_CTRLA_SRC_WIDTH_HALF_WORD | DMAC_CTRLA_DST_WIDTH_HALF_WORD;
DMAC->DMAC_CH_NUM[DMA_CHANNEL_LEDS].DMAC_CTRLB = DMAC_CTRLB_FC_MEM2PER_DMA_FC | DMAC_CTRLB_SRC_INCR_INCREMENTING | DMAC_CTRLB_DST_INCR_FIXED;
DMAC->DMAC_CH_NUM[DMA_CHANNEL_LEDS].DMAC_CFG = DMAC_CFG_DST_PER(1) | DMAC_CFG_SRC_PER(1) | DMAC_CFG_DST_H2SEL_HW | DMAC_CFG_SOD | DMAC_CFG_FIFOCFG_ALAP_CFG;
DMAC->DMAC_CHER = (1 << DMA_CHANNEL_LEDS);
//wait for transfer to start
while(SPI0->SPI_SR & SPI_SR_TXEMPTY);
SPI0->SPI_IER = SPI_IER_TXEMPTY;
}
/**
* \brief Test DMA single buffer transfer with polling mode.
*/
static void test_single_buf_xfer(void)
{
//! [dmac_define_vars]
uint32_t i;
uint32_t cfg;
dma_transfer_descriptor_t desc;
//! [dmac_define_vars]
printf("\n\rTest single buffer transfer...\n\r");
//! [dmac_define_prepare_buffer]
/** Initialize DMA buffer */
for (i = 0; i < DMA_BUF_SIZE; i++) {
g_dma_buf[0][i] = i;
g_dma_buf[1][i] = 0;
}
//! [dmac_define_prepare_buffer]
/* Initialize and enable DMA controller */
//! [dmac_init_clock]
pmc_enable_periph_clk(ID_DMAC);
//! [dmac_init_clock]
//! [dmac_init_module]
dmac_init(DMAC);
//! [dmac_init_module]
//! [dmac_set_priority]
dmac_set_priority_mode(DMAC, DMAC_PRIORITY_ROUND_ROBIN);
//! [dmac_set_priority]
//! [dmac_enable_module]
dmac_enable(DMAC);
//! [dmac_enable_module]
//! [dmac_configure_channel]
/** Set for channel configuration register */
cfg = DMAC_CFG_SOD_ENABLE | /** Enable stop on done */
DMAC_CFG_AHB_PROT(1) | /** Set AHB Protection */
DMAC_CFG_FIFOCFG_ALAP_CFG; /** FIFO Configuration */
dmac_channel_set_configuration(DMAC, DMA_CH, cfg);
//! [dmac_configure_channel]
//! [dmac_configure_for_single_transfer_1]
/** Initialize single buffer transfer: buffer 0 -> buffer 1 */
desc.ul_source_addr = (uint32_t) g_dma_buf[0];
desc.ul_destination_addr = (uint32_t) g_dma_buf[1];
//! [dmac_configure_for_single_transfer_1]
/*
* Set DMA CTRLA:
* - Set Buffer Transfer Size
* - Source transfer size is set to 32-bit width
* - Destination transfer size is set to 32-bit width
*/
//! [dmac_configure_for_single_transfer_2]
desc.ul_ctrlA = DMAC_CTRLA_BTSIZE(DMA_BUF_SIZE) |
DMAC_CTRLA_SRC_WIDTH_WORD |
DMAC_CTRLA_DST_WIDTH_WORD;
//! [dmac_configure_for_single_transfer_2]
/*
* Set DMA CTRLB:
* - Buffer Descriptor Fetch operation is disabled for the source
* - Buffer Descriptor Fetch operation is disabled for the destination
* - Memory-to-Memory Transfer
* - The source address is incremented
* - The destination address is incremented
*/
//! [dmac_configure_for_single_transfer_3]
desc.ul_ctrlB = DMAC_CTRLB_SRC_DSCR_FETCH_DISABLE |
DMAC_CTRLB_DST_DSCR_FETCH_DISABLE |
DMAC_CTRLB_FC_MEM2MEM_DMA_FC |
DMAC_CTRLB_SRC_INCR_INCREMENTING |
DMAC_CTRLB_DST_INCR_INCREMENTING;
//! [dmac_configure_for_single_transfer_3]
/* No descriptor for single transfer */
//! [dmac_configure_for_single_transfer_4]
desc.ul_descriptor_addr = 0;
dmac_channel_single_buf_transfer_init(DMAC, DMA_CH, &desc);
//! [dmac_configure_for_single_transfer_4]
/* Start DMA transfer and wait for finish */
//! [dmac_start_transfer]
dmac_channel_enable(DMAC, DMA_CH);
//! [dmac_start_transfer]
//! [dmac_wait_for_done]
while (!dmac_channel_is_transfer_done(DMAC, DMA_CH)) {
}
//! [dmac_wait_for_done]
/* Verify the transferred data */
for (i = 0; i < DMA_BUF_SIZE; i++) {
if (g_dma_buf[0][i] != g_dma_buf[1][i]) {
printf("> Test NG.\n\r");
while (1) {
}
}
}
printf("> Test OK\n\r");
}
/**
* \brief Test DMA multiple buffer transfer with interrupt mode.
*/
static void test_multi_buf_xfer(void)
{
uint32_t i;
uint32_t cfg;
dma_transfer_descriptor_t desc[3];
printf("\n\rTest multiple buffer transfer...\n\r");
/* Initialize DMA buffer */
for (i = 0; i < DMA_BUF_SIZE; i++) {
g_dma_buf[0][i] = i;
g_dma_buf[1][i] = i + 10;
g_dma_buf[2][i] = i + 20;
g_dma_buf[3][i] = 0;
g_dma_buf[4][i] = 0;
g_dma_buf[5][i] = 0;
}
/* Initialize and enable DMA controller */
pmc_enable_periph_clk(ID_DMAC);
dmac_init(DMAC);
dmac_set_priority_mode(DMAC, DMAC_PRIORITY_ROUND_ROBIN);
dmac_enable(DMAC);
/* Set for channel configuration register */
cfg = DMAC_CFG_SOD_DISABLE | /* Disable stop on done */
DMAC_CFG_AHB_PROT(1) | /* Set AHB Protection */
DMAC_CFG_FIFOCFG_ALAP_CFG; /* FIFO Configuration */
dmac_channel_set_configuration(DMAC, 0, cfg);
/* Initialize multiple buffer transfer (LLI) :
* buffer 0 -> buffer 3
* buffer 1 -> buffer 4
* buffer 2 -> buffer 5
*/
desc[0].ul_source_addr = (uint32_t) g_dma_buf[0];
desc[0].ul_destination_addr = (uint32_t) g_dma_buf[3];
/*
* Set DMA CTRLA:
* - Set Buffer Transfer Size
* - Source transfer size is set to 32-bit width
* - Destination transfer size is set to 32-bit width
*/
desc[0].ul_ctrlA = DMAC_CTRLA_BTSIZE(DMA_BUF_SIZE) |
DMAC_CTRLA_SRC_WIDTH_WORD |
DMAC_CTRLA_DST_WIDTH_WORD;
/*
* Set DMA CTRLB:
* - Descriptor is fetched from the memory
* - Descriptor is fetched from the memory
* - Memory-to-Memory Transfer
* - The source address is incremented
* - The destination address is incremented
*/
desc[0].ul_ctrlB = DMAC_CTRLB_SRC_DSCR_FETCH_FROM_MEM |
DMAC_CTRLB_DST_DSCR_FETCH_FROM_MEM |
DMAC_CTRLB_FC_MEM2MEM_DMA_FC |
DMAC_CTRLB_SRC_INCR_INCREMENTING |
DMAC_CTRLB_DST_INCR_INCREMENTING;
/* Pointer to next descriptor */
desc[0].ul_descriptor_addr = (uint32_t) &desc[1];
desc[1].ul_source_addr = (uint32_t) g_dma_buf[1];
desc[1].ul_destination_addr = (uint32_t) g_dma_buf[4];
/*
* Set DMA CTRLA:
* - Set Buffer Transfer Size
* - Source transfer size is set to 32-bit width
* - Destination transfer size is set to 32-bit width
*/
desc[1].ul_ctrlA = DMAC_CTRLA_BTSIZE(DMA_BUF_SIZE) |
DMAC_CTRLA_SRC_WIDTH_WORD |
DMAC_CTRLA_DST_WIDTH_WORD;
/*
* Set DMA CTRLB:
* - Source descriptor is fetched from the memory
* - Destination descriptor is fetched from the memory
* - Memory-to-Memory Transfer
* - The source address is incremented
* - The destination address is incremented
*/
desc[1].ul_ctrlB = DMAC_CTRLB_SRC_DSCR_FETCH_FROM_MEM |
DMAC_CTRLB_DST_DSCR_FETCH_FROM_MEM |
DMAC_CTRLB_FC_MEM2MEM_DMA_FC |
DMAC_CTRLB_SRC_INCR_INCREMENTING |
DMAC_CTRLB_DST_INCR_INCREMENTING;
/* Pointer to next descriptor */
desc[1].ul_descriptor_addr = (uint32_t) &desc[2];
desc[2].ul_source_addr = (uint32_t) g_dma_buf[2];
desc[2].ul_destination_addr = (uint32_t) g_dma_buf[5];
/*
* Set Buffer Transfer Size
* Source transfer size is set to 32-bit width
* Destination transfer size is set to 32-bit width
*/
desc[2].ul_ctrlA = DMAC_CTRLA_BTSIZE(DMA_BUF_SIZE) |
DMAC_CTRLA_SRC_WIDTH_WORD |
DMAC_CTRLA_DST_WIDTH_WORD;
/*
* Set DMA CTRLB:
* - Source descriptor is fetched from the memory
* - Destination descriptor is fetched from the memory
* - Memory-to-Memory Transfer
* - The source address is incremented
* - The destination address is incremented
*/
desc[2].ul_ctrlB = DMAC_CTRLB_SRC_DSCR_FETCH_FROM_MEM |
DMAC_CTRLB_DST_DSCR_FETCH_FROM_MEM |
DMAC_CTRLB_FC_MEM2MEM_DMA_FC |
DMAC_CTRLB_SRC_INCR_INCREMENTING |
DMAC_CTRLB_DST_INCR_INCREMENTING;
/* The end of LLI */
desc[2].ul_descriptor_addr = 0;
dmac_channel_multi_buf_transfer_init(DMAC, DMA_CH, &desc[0]);
/* Set interrupt */
NVIC_EnableIRQ(DMAC_IRQn);
dmac_enable_interrupt(DMAC, (DMAC_EBCIER_CBTC0 << DMA_CH));
/* Start DMA transfer and wait for finish */
g_xfer_done = 0;
dmac_channel_enable(DMAC, DMA_CH);
while (!g_xfer_done) {
}
/* Verify the transferred data */
for (i = 0; i < DMA_BUF_SIZE; i++) {
if ((g_dma_buf[0][i] != g_dma_buf[3][i]) ||
(g_dma_buf[1][i] != g_dma_buf[4][i]) ||
(g_dma_buf[2][i] != g_dma_buf[5][i])) {
printf("> Test NG.\n\r");
while (1) {
}
}
}
printf("> Test OK.\n\r");
}