Blackfin BF537 的 DMA模式 UART通信程序简例

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http://blog.sina.com.cn/s/blog_61e8ebaa0100eq28.html

2009年09月01日， Blackfin系列DSP学习，第一例：以DMA模式接收一组数据，显示接收成功。

磊正shuleizh@126.com

#include "GPSData.h"
#include "uart.h"
#define SSYNC asm("ssync;")

#define X_COUNT 3

volatile char sUART0_RxBuffer[X_COUNT];
/

void config_dma9(void) //Uart0 TX
{

*pDMA9_CONFIG=0;

*pDMA9_CONFIG |=FLOW_AUTO+NDSIZE_0+DI_EN+0x0020+WDSIZE_8+WNR;
// AutoBuffer +Interrupt when completion +SYNC +8 bit transfer+memory write
SSYNC;

*pDMA9_START_ADDR=0xFFC00E44;
SSYNC;

*pDMA9_X_COUNT=X_COUNT;
SSYNC;

*pDMA9_X_MODIFY=1;
SSYNC;

*pDMA9_CONFIG |=DMAEN;
}

void config_dma8(void) //Uart0 RX
{

*pDMA8_CONFIG=0;
*pDMA8_CONFIG |=FLOW_AUTO+NDSIZE_0+0x0020+WDSIZE_8+WNR+DI_EN;
// AutoBuffer +1D,Interrupt when completion +SYNC +8 bit transfer+memory write
SSYNC;

*pDMA8_START_ADDR=(void *)sUART0_RxBuffer;
SSYNC;

*pDMA8_X_COUNT=X_COUNT;
SSYNC;

*pDMA8_X_MODIFY=1;
SSYNC;

*pDMA8_CONFIG |=DMAEN;
}

//****************************************************************************

void Config_Uart0_Interrupt(void)
{

    config_dma8();     //Uart0 RX-> DMA mode
    init_uart0_dma();

    //assign core IDs to interrupt
   *pSIC_IAR0 = 0xffffffff;
*pSIC_IAR1 = 0xfff33fff; //DMA8/9 (UART0 TX/RX)-->IVG10
*pSIC_IAR2 = 0xffffffff;
*pSIC_IAR3 = 0xffffffff;

//assign ISRs to interrupt vectors
register_handler(ik_ivg10,UART0_ISR); // IVG10-> UART0_ISR

//enable interrupt
    //*pSIC_IMASK=IRQ_DMA8+IRQ_DMA9; // enable UART0_TX and UART0_RX
    *pSIC_IMASK=IRQ_DMA8; // enable UART0_RX interrupt, used when command a function

}

//****************************************************************************
//UARTx Interrupt Service Function

EX_INTERRUPT_HANDLER(UART0_ISR)
{

        // rcv_buf[0]=*pUART0_RBR;
         *pDMA8_IRQ_STATUS |=1;
         uart0SendString("DMA Recieved a message!");
        // uart0SendChar(rcv_buf[0]);
         uart0SendString("\n");


}