如何在省电模式中，唤醒后但不进中断处理?

1万 · 2024-5-28 20:00

在进入省电模式之前，用户可以藉由呼叫下列函数

__disable_irq();

禁用 IRQ 处理，使得系统在唤醒之后，会接续执行进入省电模式的下一笔指令，而不会进入中断处理程序。

除此之外，用戶还需要注意以下几点 :

用户需要 __WFI 函數後面加上函數
__ISB();
清除管线预先抓取的指令，使得接续的指令能被正确的抓取并且执行。
写 ”1” 到 NVIC_ICPR 将对应的 IRQ 处理挂起清除。
将中断旗帜清除。

只看该作者 · 2024-5-28 20:55

那唤醒后从哪儿开始执行？

只看该作者 · 2024-5-30 09:32

#include <stdio.h>
#include "NuMicro.h"

/*---------------------------------------------------------------------------------------------------------*/
/*  Function for System Entry to Power Down Mode                                                          */
/*---------------------------------------------------------------------------------------------------------*/
void PowerDownFunction(void)
{
/* Check if all the debug messages are finished */
UART_WAIT_TX_EMPTY(UART0);

/* Enter to Power-down mode */
CLK_PowerDown();
__ISB();
}

/**
* @brief    GPIO PA/PB/PG/PH IRQ
*
* @param    None
*
* @return    None
*
* @details    The PA/PB/PG/PH default IRQ, declared in startup_M031Series.s.
*/
void GPABGH_IRQHandler(void)
{
volatile uint32_t temp;

/* To check if PB.3 interrupt occurred */
if(GPIO_GET_INT_FLAG(PB, BIT3))
{
      GPIO_CLR_INT_FLAG(PB, BIT3);
      printf("INTERRUPT PB.3 INT occurred.\n");
}
else
{
      /* Un-expected interrupt. Just clear all PB interrupts */
      temp = PB->INTSRC;
      PB->INTSRC = temp;
      printf("Un-expected interrupts.\n");
}
}

void SYS_Init(void)
{
/* Unlock protected registers */
SYS_UnlockReg();

/* Enable HIRC */
CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk);

/* Waiting for HIRC clock ready */
CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);

/* Switch HCLK clock source to HIRC */
CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));

/* Set both PCLK0 and PCLK1 as HCLK/2 */
CLK->PCLKDIV = (CLK_PCLKDIV_APB0DIV_DIV2 | CLK_PCLKDIV_APB1DIV_DIV2);

/* Switch UART0 clock source to HIRC */
CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART0SEL_HIRC, CLK_CLKDIV0_UART0(1));

/* Enable UART peripheral clock */
CLK_EnableModuleClock(UART0_MODULE);

/* Update System Core Clock */
/* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CycylesPerUs automatically. */
SystemCoreClockUpdate();

/*----------------------------------------------------------------------*/
/* Init I/O Multi-function                                           */
/*----------------------------------------------------------------------*/
/* Set GPB multi-function pins for UART0 RXD and TXD */
SYS->GPB_MFPH = (SYS->GPB_MFPH & ~(SYS_GPB_MFPH_PB12MFP_Msk | SYS_GPB_MFPH_PB13MFP_Msk)) |
                  (SYS_GPB_MFPH_PB12MFP_UART0_RXD | SYS_GPB_MFPH_PB13MFP_UART0_TXD);

/* Lock protected registers */
SYS_LockReg();
}

/*----------------------------------------------------------------------*/
/* Init UART0                                                          */
/*----------------------------------------------------------------------*/
void UART0_Init(void)
{
/* Reset UART0 */
SYS_ResetModule(UART0_RST);

/* Configure UART0 and set UART0 baud rate */
UART_Open(UART0, 115200);
}

int main(void)
{
/* Init System, IP clock and multi-function I/O. */
SYS_Init();

/* Init UART0 for printf */
UART0_Init();

printf("\n\nCPU @ %d Hz\n", SystemCoreClock);
printf("+-------------------------------------------------------+\n");
printf("| GPIO Power-Down and Wake-up by PB.3 Sample Code |\n");
printf("+-------------------------------------------------------+\n\n");

/* Configure PB.3 as Input mode and enable interrupt by rising edge trigger */
GPIO_SetMode(PB, BIT3, GPIO_MODE_QUASI);
GPIO_EnableInt(PB, 3, GPIO_INT_FALLING);
NVIC_EnableIRQ(GPIO_PAPBPGPH_IRQn);

/* Enable interrupt de-bounce function and select de-bounce sampling cycle time is 1024 clocks of LIRC clock */
GPIO_SET_DEBOUNCE_TIME(GPIO_DBCTL_DBCLKSRC_LIRC, GPIO_DBCTL_DBCLKSEL_1024);
GPIO_ENABLE_DEBOUNCE(PB, BIT3);

/* Unlock protected registers before entering Power-down mode */
SYS_UnlockReg();

/* Waiting for PB.3 rising-edge interrupt event */
while(1)
{
      printf("Enter to Power-Down. Wait PB.3 rising edge interrupt to wake up ...\n");
      __disable_irq();
      /* Enter to Power-down mode */
      PowerDownFunction();
      printf("MAIN PB.3 INT occurred.\n");
   GPIO_CLR_INT_FLAG(PB, BIT3);
   NVIC_ClearPendingIRQ(GPIO_PAPBPGPH_IRQn);
      printf("System waken-up done.\n\n");
}
}

如何在省电模式中，唤醒后但不进中断处理?

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