small_water_meter_4g_src/Drivers/Board/dma_drv.c

 
#include "board.h"

static int16_t DMA_ClkNest = 0;
void DMA_ReqClkOn(void)
{
    rt_base_t level;

    level = rt_hw_interrupt_disable();
    DMA_ClkNest++;
    M0P_SYSCTRL->PERI_CLKEN0 |= (1u<<29);  // set DMA clk on
    rt_hw_interrupt_enable(level);
}

void DMA_ReqClkOff(void)
{
    rt_base_t level;

    level = rt_hw_interrupt_disable();
    DMA_ClkNest--;
    if (DMA_ClkNest<=0){
        DMA_ClkNest = 0;
        M0P_SYSCTRL->PERI_CLKEN0 &= ~(1u<<29);  // set DMA clk off
    }
    rt_hw_interrupt_enable(level);
}

uint16_t DMA_Busy(void)
{
    uint16_t Flag;
    rt_base_t level;

    level = rt_hw_interrupt_disable();

    if (DMA_ClkNest<=0){        // must judge it at first to assure DMA clock is on
        Flag = 0x0000u;
    } else if ((M0P_DMAC->CONFA0 | M0P_DMAC->CONFA1) & (0x1u<<31)){
        Flag = 0x0001u;
    } else {
        Flag = 0x0000u;
    }

    rt_hw_interrupt_enable(level);

    return(Flag);
}

// interrupt routine
void DMAC_IRQHandler(void)
{
//    // for TDC SPI
//    if (M0P_DMAC->CONFB0_f.STAT) {
//        M0P_DMAC->CONFB0_f.STAT = 0;    // clear DMA interrupt
//        DMA_ReqClkOff();
//    }

    // for LPUART1 Serplot
    if (M0P_DMAC->CONFB1_f.STAT) {
        M0P_DMAC->CONFB1_f.STAT = 0;    // clear DMA interrupt
        DMA_ReqClkOff();
    }
}