[求助] TM4C123的串口DMA 只能发送缓冲区的第一个字节

627933142 2019-3-26 20:02 楼主

悬赏 5 分芯积分未解决

近日在调串口DMA 想节省CPU资源
现在能收到DMA发送的数据了但是只能发送第一个字节
我自己又写了一个发送的函数也是只能发第一个字节而且是重复发送4次一直找不到原因求大佬指点迷津
uint8_t RxBuf[1];
uint8_t TxBuf[2]={0x0a,0x0b};
void UART_init(void)
{
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
SysCtlPeripheralEnable(SYSCTL_PERIPH_UART2);
HWREG(GPIO_PORTD_BASE + GPIO_O_LOCK) = GPIO_LOCK_KEY;
  HWREG(GPIO_PORTD_BASE + GPIO_O_CR) = 0xFF;

  GPIOPinConfigure(GPIO_PD7_U2TX);
  GPIOPinConfigure(GPIO_PD6_U2RX);
  GPIOPinTypeUART(GPIO_PORTD_BASE,GPIO_PIN_7|GPIO_PIN_6);
  UARTConfigSetExpClk(UART2_BASE,SysCtlClockGet(),115200,
                  UART_CONFIG_WLEN_8|
                  UART_CONFIG_STOP_ONE|UART_CONFIG_PAR_NONE);
UARTFIFOLevelSet(UART2_BASE,UART_FIFO_TX1_8,UART_FIFO_RX1_8);

  UARTEnable(UART2_BASE);
UARTDMAEnable(UART2_BASE,UART_DMA_TX|UART_DMA_RX);
uDMAChannelAttributeDisable(UDMA_CH0_UART2RX,
                           UDMA_ATTR_ALTSELECT |
                           UDMA_ATTR_HIGH_PRIORITY |
                           UDMA_ATTR_REQMASK);
uDMAChannelControlSet(UDMA_CH0_UART2RX |
                     UDMA_PRI_SELECT,
                     UDMA_SIZE_8 |
                     UDMA_SRC_INC_NONE |
                     UDMA_DST_INC_NONE |
                     UDMA_ARB_1);
uDMAChannelTransferSet(UDMA_CH0_UART2RX |
                     UDMA_PRI_SELECT,
                     UDMA_MODE_BASIC,
         (void *)(UART2_BASE + UART_O_DR),
         RxBuf,
                     sizeof(RxBuf));
  uDMAChannelAttributeDisable(UDMA_CH1_UART2TX,
                           UDMA_ATTR_ALTSELECT|
                           UDMA_ATTR_HIGH_PRIORITY|
                           UDMA_ATTR_REQMASK);
  uDMAChannelControlSet(UDMA_CH1_UART2TX |
         UDMA_PRI_SELECT,
                     UDMA_SIZE_8 |
         UDMA_SRC_INC_NONE |
                     UDMA_DST_INC_NONE |
                     UDMA_ARB_4);
  uDMAChannelTransferSet(UDMA_CH1_UART2TX |
         UDMA_PRI_SELECT,
                     UDMA_MODE_BASIC,
         TxBuf,
                     (void *)(UART2_BASE + UART_O_DR),
                     sizeof(TxBuf));
  uDMAChannelEnable(UDMA_CH0_UART2RX);
  uDMAChannelEnable(UDMA_CH1_UART2TX);
  UARTIntEnable(UART2_BASE, UART_INT_DMARX);
UARTIntEnable(UART2_BASE, UART_INT_DMATX);
  IntEnable(INT_UART2);

}
void UART2_DMA_TX(uint8_t *p)//自己写的发送和接收函数也是只能发送第一个字节而且是重复发送4次
{
uDMAChannelTransferSet(UDMA_CH1_UART2TX | UDMA_PRI_SELECT,
                                    UDMA_MODE_BASIC,p,
                                    (void *)(UART2_BASE + UART_O_DR),
                                    sizeof(p));
  uDMAChannelEnable(UDMA_CH1_UART2TX);
  uDMAChannelRequest(UDMA_CH1_UART2TX);
}
void UART2_DMA_RX(uint8_t *p)
{
uDMAChannelTransferSet(UDMA_CH0_UART2RX | UDMA_PRI_SELECT,
                                    UDMA_MODE_BASIC,
                                    (void *)(UART2_BASE + UART_O_DR),
                                    p,
                                    sizeof(p));
  uDMAChannelEnable(UDMA_CH0_UART2RX);
// uDMAChannelRequest(UDMA_CH0_UART2RX);
}
void UART2IntHandler(void)
{
  uint32_t ui32Status;
uint32_t ui32Mode;
ui32Status = UARTIntStatus(UART2_BASE, 1);
UARTIntClear(UART2_BASE, ui32Status);
ui32Mode = uDMAChannelModeGet(UDMA_CH1_UART2TX | UDMA_PRI_SELECT);
if(ui32Mode == UDMA_MODE_STOP)
{
   uDMAChannelTransferSet(UDMA_CH1_UART2TX | UDMA_PRI_SELECT,
                                    UDMA_MODE_BASIC, TxBuf,
                                    (void *)(UART2_BASE + UART_O_DR),
                                    sizeof(TxBuf));
   uDMAChannelEnable(UDMA_CH1_UART2TX);
}
if(!uDMAChannelIsEnabled(UDMA_CH0_UART2RX))
{
   uDMAChannelTransferSet(UDMA_CH0_UART2RX | UDMA_PRI_SELECT,
                                 UDMA_MODE_BASIC,
                                 (void *)(UART2_BASE + UART_O_DR),RxBuf,
                                 sizeof(RxBuf));
   uDMAChannelEnable(UDMA_CH0_UART2RX);
}
}
接收还没测