单片机休眠和掉电模式到底是什么关系？

7130 单片机低功耗

问答对人有帮助，内容完整，我也想知道答案 0 单片机低功耗的关键就是休眠，休眠的最高境界就是掉电模式 /************************************************************************// * @file main.c * @version V3.00 * $Revision: 2 $ * $Date: 16/10/25 4:29p $ * @brief Show how to wake up system from Power-down mode by GPIO interrupt. * @note * Copyright (C) 2016 Nuvoton Technology Corp. All rights reserved. *****************************************************************************/ #include #include "NUC029xGE.h" #define PLLCTL_SETtiNG CLK_PLLCTL_72MHz_HXT #define PLL_CLOCK 72000000 /---------------------------------------------------------------------------------------------------------/ / 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(); } /* * @brief PortA/PortB IRQ * * @param None * * @return None * * @Details The PortA/PortB default IRQ, declared in startup_NUC029xGE.s. / void GPAB_IRQHandler(void) { / To check if PB.3 interrupt occurred / if(GPIO_GET_INT_FLAG(PB, BIT3)) { GPIO_CLR_INT_FLAG(PB, BIT3); printf("PB.3 INT occurred.n"); } else { / Un-expected interrupt. Just clear all PB interrupts / PB->INTSRC = PB->INTSRC; printf("Un-expected interrupts.n"); } } void SYS_Init(void) { /---------------------------------------------------------------------------------------------------------/ / Init System Clock / /---------------------------------------------------------------------------------------------------------/ / Enable HIRC clock (Internal RC 22.1184MHz) / CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk); / Wait for HIRC clock ready / CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk); / Select HCLK clock source as HIRC and HCLK source divider as 1 / CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1)); / Enable HXT clock (external XTAL 12MHz) / CLK_EnableXtalRC(CLK_PWRCTL_HXTEN_Msk); / Wait for HXT clock ready / CLK_WaitClockReady(CLK_STATUS_HXTSTB_Msk); / Set core clock as PLL_CLOCK from PLL / CLK_SetCoreClock(PLL_CLOCK); / Enable UART module clock / CLK_EnableModuleClock(UART0_MODULE); / Select UART module clock source as HXT and UART module clock divider as 1 / CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UARTSEL_HXT, CLK_CLKDIV0_UART(1)); /---------------------------------------------------------------------------------------------------------/ / Init I/O Multi-function / /---------------------------------------------------------------------------------------------------------/ / Set multi-function pins for UART0 RXD and TXD / SYS->GPA_MFPL &= ~(SYS_GPA_MFPL_PA2MFP_Msk \| SYS_GPA_MFPL_PA3MFP_Msk); SYS->GPA_MFPL \|= (SYS_GPA_MFPL_PA3MFP_UART0_RXD \| SYS_GPA_MFPL_PA2MFP_UART0_TXD); } void UART0_Init() { /---------------------------------------------------------------------------------------------------------/ / Init UART / /---------------------------------------------------------------------------------------------------------/ / Reset UART0 / SYS_ResetModule(UART0_RST); / Configure UART0 and set UART0 baud rate / UART_Open(UART0, 115200); } /---------------------------------------------------------------------------------------------------------/ / MAIN function / /---------------------------------------------------------------------------------------------------------/ int main(void) { / Unlock protected registers / SYS_UnlockReg(); / Init System, peripheral clock and multi-function I/O / SYS_Init(); / Lock protected registers / SYS_LockReg(); / Init UART0 for printf / UART0_Init(); printf("nnCPU @ %d Hzn", SystemCoreClock); printf("+-------------------------------------------------------+n"); printf("\| GPIO Power-Down and Wake-up by PB.3 Sample Code \|n"); printf("+-------------------------------------------------------+nn"); / Configure PB.3 as Input mode and enable interrupt by rising edge trigger / GPIO_SetMode(PB, BIT3, GPIO_MODE_INPUT); GPIO_EnableInt(PB, 3, GPIO_INT_RISING); NVIC_EnableIRQ(GPAB_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 / printf("Enter to Power-Down ......n"); / Enter to Power-down mode / PowerDownFunction(); printf("System waken-up done.nn"); while(1); } / (C) COPYRIGHT 2016 Nuvoton Technology Corp. */ 0
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答案对人有帮助，有参考价值 0 CLK_PowerDown(); 掉电模式的关键函数BSP已经提供了，我们看看到底怎么实现的 /** * @brief Enter to Power-down mode * @param None * @return None * @details This function is used to let system enter to Power-down mode. n * The register write-protection function should be disabled before using this function. / void CLK_PowerDown(void) { / Set the processor uses deep sleep as its low power mode / SCB->SCR \|= SCB_SCR_SLEEPDEEP_Msk; / Set system Power-down enabled/ CLK->PWRCTL \|= CLK_PWRCTL_PDEN_Msk; / Chip enter Power-down mode after CPU run WFI instruction */ __WFI(); }

2022-5-12 10:41:36 评论举报张涵

答案对人有帮助，有参考价值 0 掉电会触发“低压” or "什么“中断，得有个后备电源（电容，UPS）吧，然后进入”休眠“？

2022-5-12 10:41:48 评论举报刘艺星