#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");
}
}
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