c - 定时器触发 GPDMA 传输到 SRAM

Question

我想从外部 AD 转换器传输数据。我得到存储在数组中的并行 11 位。我想设置一个定时器触发的 GPDMA 传输，每 50ns 触发一个 DMA 流并传输数据。传输完成后，RAM 地址应递增。

我使用的 MCU 是 LPC4088 快速入门板。CPU 和外设时钟，以 120Mhz 运行

我研究了LPC4088的UM，已经写了一些简单的基本代码。

#include "LPC407x_8x_177x_8x.h"

#define PERIPHSRAM1           0x20004000

char adcData[11] = {1,1,1,1,1,1,1,1,1,1,1};

volatile uint32_t DMATCCOUNT = 0;
volatile uint32_t DMAERRCOUNT = 0;


int main(){

    uint8_t size = sizeof(adcData);

    LPC_SC->PCONP |= (1 << 22);                     //Power & Clock  Timer2

    LPC_TIM2->CTCR = (0 << 0);                      //Timer Mode
    LPC_TIM2->PR = 0;
    LPC_TIM2->TCR = (1 << 1);                       //Reset timer

    LPC_TIM2->TC = 0;               
    LPC_TIM2->MR0 = 5;                        //Match register to get 10MHz
    LPC_TIM2->MCR = (1 << 1)                        //Reset Timer
                    |(1 << 0);                   //Interrupt if MR0 matches
    LPC_TIM2->EMR = 0x31;                 //toggle pin to check wave output
    LPC_TIM2->TCR = (1 << 1);                       //reset timer again

    LPC_SC->PCONP |= (1 << 29);                     //Power & Clock DMA
    LPC_GPDMACH0->CConfig = 0;                      //disable CH0
    LPC_GPDMA->Config |= (1 << 0);                  //enable DMA Controller
    LPC_SC->DMAREQSEL = 0x010;                 //Set T2 MAT0 as DMA request

    LPC_GPDMA->IntErrClr |= 0x0FF;
    LPC_GPDMA->IntTCClear |= 0x0FF;

    LPC_GPDMACH0->CDestAddr = PERIPHSRAM1;
    LPC_GPDMACH0->CSrcAddr = (uint32_t) &adcData;
    LPC_GPDMACH0->CControl = size
                            |(0x00 << 12) //Source Burst size: 1
                            |(0x00 << 15) //Destination Burst size: 1 
                            |(0x02 << 18) //Source width:     32 bit
                            |(0x02 << 21) //Destination width:32 bit
                            |(0x01 << 26) //Source increment: enabled
                            |(0x01 << 27) //Destination increment: enabled
                            |(0x01 << 31); //TermCount interrupt enabled

    LPC_GPDMACH0->CControl |= (4 << 1)      //Source peripheral: Timer2 MR0
                           |(0 << 11);      //Memory to memory trasnfer

    NVIC_SetVector(DMA_IRQn, (uint32_t) DMA_IRQHandler);
    NVIC_EnableIRQ(DMA_IRQn);

    LPC_GPDMACH0->CConfig |= 1;         //Enable channel
    LPC_TIM2->IR |= 0x0FF;              //CLear all timer interrupts
    LPC_TIM2->TCR = 0x01;               //start Timer

    while(!DMATCCOUNT);                 //Wait till transfer Complete

    while(1){

    }
}

void DMA_IRQHandler(void){
    uint32_t temp;
    DMATCCOUNT++;
    temp = LPC_GPDMA->IntTCStat;
    if(temp){
        DMATCCOUNT++;
        LPC_GPDMA->IntTCClear |= temp;
    }
    temp = LPC_GPDMA->IntErrStat;
    if(temp){
        DMAERRCOUNT++;
        LPC_GPDMA->IntErrClr |= temp;
    }
    return;
}


I expected data on address 0x20004000, but there is nothing. 

Hope any of you guys could help me.

标签： clpcnxp-microcontroller