/**************************************************************************//**
* [url=home.php?mod=space&uid=288409]@file[/url] main.c
* [url=home.php?mod=space&uid=895143]@version[/url] V3.00
* @brief
* Show how to wake up system form Power-down mode by brown-out detector interrupt.
*
*
* [url=home.php?mod=space&uid=17282]@CopyRight[/url] (C) 2019 Nuvoton Technology Corp. All rights reserved.
*
******************************************************************************/
#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(DEBUG_PORT);
/* Enable Power-down mode wake-up interrupt */
CLK->PWRCTL |= CLK_PWRCTL_PDWKIEN_Msk;
/* Enter to Power-down mode */
CLK_PowerDown();
}
/*---------------------------------------------------------------------------------------------------------*/
/* Brown Out Detector IRQ Handler */
/*---------------------------------------------------------------------------------------------------------*/
void BOD_IRQHandler(void)
{
/* Clear BOD Interrupt Flag */
SYS_CLEAR_BOD_INT_FLAG();
printf("Brown Out is Detected.\n");
}
/*---------------------------------------------------------------------------------------------------------*/
/* Power-down Mode Wake-up IRQ Handler */
/*---------------------------------------------------------------------------------------------------------*/
void PWRWU_IRQHandler(void)
{
/* Check system power down mode wake-up interrupt status flag */
if(CLK->PWRCTL & CLK_PWRCTL_PDWKIF_Msk)
{
/* Clear system power down wake-up interrupt flag */
CLK->PWRCTL |= CLK_PWRCTL_PDWKIF_Msk;
printf("System wake-up from Power-down mode.\n");
}
}
void SYS_Init(void)
{
/* Set PF multi-function pins for XT1_OUT(PF.2) and XT1_IN(PF.3) */
SYS->GPF_MFPL = (SYS->GPF_MFPL & (~SYS_GPF_MFPL_PF2MFP_Msk)) | SYS_GPF_MFPL_PF2MFP_XT1_OUT;
SYS->GPF_MFPL = (SYS->GPF_MFPL & (~SYS_GPF_MFPL_PF3MFP_Msk)) | SYS_GPF_MFPL_PF3MFP_XT1_IN;
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Enable HIRC clock */
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 */
CLK_EnableXtalRC(CLK_PWRCTL_HXTEN_Msk);
/* Wait for HXT clock ready */
CLK_WaitClockReady(CLK_STATUS_HXTSTB_Msk);
/* Enable PLL */
CLK->PLLCTL = CLK_PLLCTL_128MHz_HIRC;
/* Waiting for PLL stable */
CLK_WaitClockReady(CLK_STATUS_PLLSTB_Msk);
/* Select HCLK clock source as PLL and HCLK source divider as 2 */
CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_PLL, CLK_CLKDIV0_HCLK(2));
/* Update System Core Clock */
/* User can use SystemCoreClockUpdate() to calculate SystemCoreClock. */
SystemCoreClockUpdate();
/* 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_UART0SEL_HXT, CLK_CLKDIV0_UART0(1));
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set multi-function pins for UART0 RXD and TXD */
SYS->GPB_MFPH = (SYS->GPB_MFPH & (~(UART0_RXD_PB12_Msk | UART0_TXD_PB13_Msk))) | UART0_RXD_PB12 | UART0_TXD_PB13;
}
void UART0_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init UART */
/*---------------------------------------------------------------------------------------------------------*/
/* Reset UART0 */
SYS_ResetModule(UART0_RST);
/* Configure UART0 and set UART0 baud rate */
UART_Open(UART0, 115200);
}
/*---------------------------------------------------------------------------------------------------------*/
/* Main Function */
/*---------------------------------------------------------------------------------------------------------*/
int32_t 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("\n\nCPU [url=home.php?mod=space&uid=72445]@[/url] %d Hz\n", SystemCoreClock);
printf("+------------------------------------------------+\n");
printf("| Power-down and Wake-up Sample Code |\n");
printf("+------------------------------------------------+\n");
/* Unlock protected registers before setting Brown-out detector function and Power-down mode */
SYS_UnlockReg();
/* Enable Brown-out detector function */
SYS_ENABLE_BOD();
/* Set Brown-out detector voltage level as 3.0V */
SYS_SET_BOD_LEVEL(SYS_BODCTL_BODVL_3_0V);
/* Enable Brown-out detector interrupt function */
SYS_DISABLE_BOD_RST();
/* Enable Brown-out detector and Power-down wake-up interrupt */
NVIC_EnableIRQ(BOD_IRQn);
NVIC_EnableIRQ(PWRWU_IRQn);
printf("System enter to Power-down mode.\n");
printf("System wake-up if VDD voltage is lower than 3.0V.\n\n");
/* Enter to Power-down mode */
PowerDownFunction();
/* Wait for Power-down mode wake-up interrupt happen */
while(1);
}
/*** (C) COPYRIGHT 2019 Nuvoton Technology Corp. ***/
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