Part Number: MSP432P401R
I have the UART working with RX and TX using interrupts. I need to change the UART to work with DMA. I tried following examples I found from other posts but have been unable to get anything working.
/* DMA Control Table */
#if defined(__TI_COMPILER_VERSION__)
#pragma DATA_ALIGN(MSP_EXP432P401RLP_DMAControlTable, 1024)
#elif defined(__IAR_SYSTEMS_ICC__)
#pragma data_alignment=1024
#elif defined(__GNUC__)
__attribute__ ((aligned (1024)))
#elif defined(__CC_ARM)
__align(1024)
#endif
static DMA_ControlTable MSP_EXP432P401RLP_DMAControlTable[32];
void configDMA_DICE_UART(void){
MAP_DMA_enableModule();
MAP_DMA_setControlBase(MSP_EXP432P401RLP_DMAControlTable);
MAP_DMA_assignChannel(DMA_CH4_EUSCIA2TX); //Assign DMA channel 4 to EUSCI_A2_TX
MAP_DMA_disableChannelAttribute(DMA_CH4_EUSCIA2TX,UDMA_ATTR_ALTSELECT | UDMA_ATTR_USEBURST | UDMA_ATTR_HIGH_PRIORITY | UDMA_ATTR_REQMASK);
MAP_DMA_setChannelControl(DMA_CH4_EUSCIA2TX | UDMA_PRI_SELECT, UDMA_SIZE_8 | UDMA_SRC_INC_8 | UDMA_DST_INC_NONE | UDMA_ARB_1);
EUSCI_A0_BASE
MAP_DMA_assignInterrupt(DMA_INT1, 4);
MAP_DMA_clearInterruptFlag(4);
}
__attribute__((interrupt))
void DMA_INT1_IRQHandler(void){
uint32_t ui32Mode;
ui32Mode=MAP_DMA_getChannelMode(DMA_CH4_EUSCIA2TX | UDMA_PRI_SELECT);
if(ui32Mode==UDMA_MODE_STOP)
{
dice_tx_busy=0;
EUSCI_A2->IFG &= ~EUSCI_A_IFG_TXIFG;
}
MAP_DMA_clearInterruptFlag(4);
MAP_DMA_disableInterrupt(DMA_INT1);
}
__attribute__((interrupt))
void DMA_ERR_IRQHandler(void)
{
uint32_t ui32Status;
// Check for uDMA error bit
ui32Status = MAP_DMA_getErrorStatus( );
// If there is a uDMA error, then clear the error and increment the error counter
if(ui32Status)
{
MAP_DMA_clearErrorStatus();
}
}
void EUSCIA2_IRQHandler(void)
{
volatile uint8_t temp;
if (EUSCI_A2->IFG & EUSCI_A_IFG_RXIFG)
{
dice_rx[dice_rx_wri] = EUSCI_A2->RXBUF;
if(++dice_rx_wri >= dice_rx_size)
{
dice_rx_wri=0;
}
dice_rx_cnt++;
}
// if (EUSCI_A2->IFG & EUSCI_A_IFG_TXIFG)
// {
// // Check DICE transmit queue
// if(!(dice_tx_mt()))
// {
// EUSCI_A2->TXBUF=dice_tx_deq();
// }
// else
// {
// // Nothing to transmit, disable transmit interrupt
// dice_tx_busy=0;
// EUSCI_A2->IFG &= ~EUSCI_A_IFG_TXIFG;
// }
// }
}
// Here is where I try to give data to DMA
uint32_t *DICE_TX;
DICE_TX = (uint32_t *)&EUSCI_A2->TXBUF;
//Pop packet from Priority Buffer to DICE TX Buffer
void Priority_pop(PacketType Packet){
int i;
switch(Packet){
case HS_DATA:
MAP_DMA_setChannelTransfer(DMA_CH4_EUSCIA2TX | UDMA_PRI_SELECT, UDMA_MODE_BASIC,PRIORITY_BUF.HS_DATA_BUF.buffer[PRIORITY_BUF.HS_DATA_BUF.TAIL].all_8,
(void*)DICE_TX,HS_DATA_SIZE);
//for(i=0;i<HS_DATA_SIZE;i++)
//{
// dice_tx_enq(PRIORITY_BUF.HS_DATA_BUF.buffer[PRIORITY_BUF.HS_DATA_BUF.TAIL].all_8[i]);
//}
PRIORITY_BUF.HS_DATA_BUF.TAIL=(PRIORITY_BUF.HS_DATA_BUF.TAIL+1)%hsdata_buff_size;
PRIORITY_BUF.HS_DATA_BUF.packet_count--;
MAP_DMA_enableChannel(4);
MAP_Interrupt_enableInterrupt(DMA_INT1);
EUSCI_A2->IFG |= EUSCI_A_IFG_TXIFG;
break;
// Only using this case right now for testing
}
}
