寄存器操作M051实现IO中断
![]() /**************************************************************************//**
* @file main.c
* @version V3.00
* $Revision: 3 $
* $Date: 14/04/03 9:18a $
* @brief M051 Series GPIO Driver Sample Code
*
* @note
* Copyright (C) 2013 Nuvoton Technology Corp. All rights reserved.
******************************************************************************/
#include <stdio.h>
#include "M051Series.h"
#define PLLCON_SETTING CLK_PLLCON_50MHz_HXT
#define PLL_CLOCK 50000000
/**
* @brief Port0/Port1 IRQ
*
* @param None
*
* @return None
*
* @Details The Port0/Port1 default IRQ, declared in startup_M051Series.s.
*/
void GPIOP0P1_IRQHandler(void)
{
/* To check if P1.3 interrupt occurred */
if(P1->ISRC & BIT3)
{
P1->ISRC = BIT3;
printf("P1.3 INT occurred.\n");
}
else
{
/* Un-expected interrupt. Just clear all PORT0, PORT1 interrupts */
P0->ISRC = P0->ISRC;
P1->ISRC = P1->ISRC;
printf("Un-expected interrupts.\n");
}
}
/**
* @brief Port2/Port3/Port4 IRQ
*
* @param None
*
* @return None
*
* @details The Port2/Port3/Port4 default IRQ, declared in startup_M051Series.s.
*/
void GPIOP2P3P4_IRQHandler(void)
{
/* To check if P4.5 interrupt occurred */
if(P4->ISRC & BIT5)
{
P4->ISRC = BIT5;
printf("P4.5 INT occurred.\n");
}
else
{
/* Un-expected interrupt. Just clear all PORT2, PORT3 and PORT4 interrupts */
P2->ISRC = P2->ISRC;
P3->ISRC = P3->ISRC;
P4->ISRC = P4->ISRC;
printf("Un-expected interrupts.\n");
}
}
void SYS_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Enable Internal RC 22.1184MHz clock */
CLK->PWRCON |= CLK_PWRCON_OSC22M_EN_Msk;
/* Waiting for Internal RC clock ready */
while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_OSC22M_STB_Msk));
/* Switch HCLK clock source to Internal RC and and HCLK source divide 1 */
CLK->CLKSEL0 &= ~CLK_CLKSEL0_HCLK_S_Msk;
CLK->CLKSEL0 |= CLK_CLKSEL0_HCLK_S_HIRC;
CLK->CLKDIV &= ~CLK_CLKDIV_HCLK_N_Msk;
CLK->CLKDIV |= CLK_CLKDIV_HCLK(1);
/* Enable external XTAL 12MHz clock */
CLK->PWRCON |= CLK_PWRCON_XTL12M_EN_Msk;
/* Waiting for external XTAL clock ready */
while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_XTL12M_STB_Msk));
/* Set core clock as PLL_CLOCK from PLL */
CLK->PLLCON = PLLCON_SETTING;
while(!(CLK->CLKSTATUS & CLK_CLKSTATUS_PLL_STB_Msk));
CLK->CLKSEL0 &= (~CLK_CLKSEL0_HCLK_S_Msk);
CLK->CLKSEL0 |= CLK_CLKSEL0_HCLK_S_PLL;
/* Update System Core Clock */
/* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CycylesPerUs automatically. */
//SystemCoreClockUpdate();
PllClock = PLL_CLOCK; // PLL
SystemCoreClock = PLL_CLOCK / 1; // HCLK
CyclesPerUs = PLL_CLOCK / 1000000; // For SYS_SysTickDelay()
/* Enable UART module clock */
CLK->APBCLK |= CLK_APBCLK_UART0_EN_Msk;
/* Select UART module clock source */
CLK->CLKSEL1 &= ~CLK_CLKSEL1_UART_S_Msk;
CLK->CLKSEL1 |= CLK_CLKSEL1_UART_S_PLL;
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set P3 multi-function pins for UART0 RXD and TXD */
SYS->P3_MFP &= ~(SYS_MFP_P30_Msk | SYS_MFP_P31_Msk);
SYS->P3_MFP |= (SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0);
}
void UART0_Init()
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init UART */
/*---------------------------------------------------------------------------------------------------------*/
/* Reset UART IP */
SYS->IPRSTC2 |= SYS_IPRSTC2_UART0_RST_Msk;
SYS->IPRSTC2 &= ~SYS_IPRSTC2_UART0_RST_Msk;
/* Configure UART0 and set UART0 Baudrate */
UART0->BAUD = UART_BAUD_MODE2 | UART_BAUD_MODE2_DIVIDER(PLL_CLOCK, 115200);
UART0->LCR = UART_WORD_LEN_8 | UART_PARITY_NONE | UART_STOP_BIT_1;
}
/*---------------------------------------------------------------------------------------------------------*/
/* MAIN function */
/*---------------------------------------------------------------------------------------------------------*/
int main(void)
{
/* Unlock protected registers */
SYS->REGWRPROT = 0x59;
SYS->REGWRPROT = 0x16;
SYS->REGWRPROT = 0x88;
/* Init System, peripheral clock and multi-function I/O */
SYS_Init();
/* Lock protected registers */
SYS->REGWRPROT = 0x0;
/* Init UART0 for printf */
UART0_Init();
printf("\n\nCPU @ %d Hz\n", SystemCoreClock);
printf("+------------------------------------------------+\n");
printf("| GPIO P1.3 and P4.5 Interrupt Sample Code |\n");
printf("+------------------------------------------------+\n\n");
/*-----------------------------------------------------------------------------------------------------*/
/* GPIO Interrupt Function Test */
/*-----------------------------------------------------------------------------------------------------*/
printf("P1.3 and P4.5 are used to test interrupt ......\n");
/* Configure P1.3 as Input mode and enable interrupt by rising edge trigger */
P1->PMD = P1->PMD & (~GPIO_PMD_PMD3_Msk) | (GPIO_PMD_INPUT << GPIO_PMD_PMD3_Pos);
P1->IMD |= (GPIO_IMD_EDGE << 3);
P1->IEN |= (BIT3 << GPIO_IEN_IR_EN_Pos);
NVIC_EnableIRQ(GPIO_P0P1_IRQn);
/* Configure P4.5 as Quasi-bidirection mode and enable interrupt by falling edge trigger */
P4->PMD = P1->PMD & (~GPIO_PMD_PMD5_Msk) | (GPIO_PMD_QUASI << GPIO_PMD_PMD5_Pos);
P4->IMD |= (GPIO_IMD_EDGE << 5);
P4->IEN |= (BIT5 << GPIO_IEN_IF_EN_Pos);
NVIC_EnableIRQ(GPIO_P2P3P4_IRQn);
/* Waiting for interrupts */
while(1);
}
/*** (C) COPYRIGHT 2013 Nuvoton Technology Corp. ***/
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