[参考译文] MSPM0L1306：计时器的通用发布者事件示例

您好、Gary Gao、

将 DMA 目标地址设置为缓冲器的原因是首先测试 DMA 触发源。 这不是问题。

我猜问题的原因是 DMA 用户设置。

DL_DMA_setSubscriberChanID 函数不会自动包含在 SysConfig 生成的文件中。

我正在尝试实现下图。 并尝试使用 DMA 而不是 SW 写入 TIMx.LOAD = A。

ST 已提供示例和参考、如下链接所示。

https://community.st.com/t5/stm32-mcus/custom-signal-generation-using-pwm-and-dma/ta-p/49809

下面是我简单针对 PWM 和 DMA 操作测试的代码。

它似乎工作正常、但我不知道我是否设置正确。

e2e.ti.com/.../7723.ti_5F00_msp_5F00_dl_5F00_config.ce2e.ti.com/.../4452.ti_5F00_msp_5F00_dl_5F00_config.h

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#include "ti_msp_dl_config.h"



#define DMA_TRANSFER_SIZE_WORDS (16)

const uint16_t gSrcData[DMA_TRANSFER_SIZE_WORDS] =
{1000, 5000, 10000, 15000, 20000, 25000, 30000, 35000,
 40000, 45000, 49999, 40000, 30000, 20000, 10000, 2000};

uint16_t gDstData;

volatile bool gChannel0InterruptTaken = false;

volatile uint32_t gUpdateCnt;


int main(void)
{
    SYSCFG_DL_init();

    gUpdateCnt = 0;
    DL_TimerG_startCounter(PWM_0_INST);

    /* Setup interrupts on device */
    DL_SYSCTL_disableSleepOnExit();
    NVIC_EnableIRQ(DMA_INT_IRQn);

    /* Configure DMA source, destination and size */
    DL_DMA_setSrcAddr(DMA, DMA_CH0_CHAN_ID, (uint32_t) &gSrcData[0]);
    DL_DMA_setDestAddr(DMA, DMA_CH0_CHAN_ID, (uint32_t)(&PWM_0_INST->COUNTERREGS.CC_01[0]));
    DL_DMA_setTransferSize(DMA, DMA_CH0_CHAN_ID, DMA_TRANSFER_SIZE_WORDS);
    DL_DMA_setSubscriberChanID(DMA, DL_DMA_SUBSCRIBER_INDEX_0, PWM_0_INST_PUB_0_CH);
    DL_DMA_enableChannel(DMA, DMA_CH0_CHAN_ID);


    gChannel0InterruptTaken = false;
    DL_DMA_startTransfer(DMA, DMA_CH0_CHAN_ID);

    /* Wait for transfer */
    while (gChannel0InterruptTaken == false) {
        __WFE();
    }

    /* Breakpoint to inspect verification result */
    __BKPT(0);


    while (1)
    {
        __WFI();
    }
}

void PWM_0_INST_IRQHandler(void)
{
    switch (DL_TimerG_getPendingInterrupt(PWM_0_INST))
    {
        case DL_TIMERG_IIDX_CC0_DN:
            gUpdateCnt++;
            default:
                break;
    }
}

void DMA_IRQHandler(void)
{
    /* Example interrupt code -- just used to break the WFI in this example */
    switch (DL_DMA_getPendingInterrupt(DMA)) {
        case DMA_IIDX_STAT_DMACH0:
            gChannel0InterruptTaken = true;
            break;
        default:
            break;
    }
}