/******************************************************************************
* [url=home.php?mod=space&uid=288409]@file[/url] main.c
* [url=home.php?mod=space&uid=895143]@version[/url] V3.00
* $Revision: 7 $
* $Date: 15/05/22 2:56p $
* [url=home.php?mod=space&uid=247401]@brief[/url] Demonstrate how ACMP works with internal band-gap voltage.
*
* @note
* Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
*****************************************************************************/
#include <stdio.h>
#include "M051Series.h"
/* Function prototype declaration */
void SYS_Init(void);
int32_t main(void)
{
/* Unlock protected registers */
SYS_UnlockReg();
/* Init System, IP clock and multi-function I/O. */
SYS_Init();
/* Lock protected registers */
SYS_LockReg();
/* Configure UART0: 115200, 8-bit word, no parity bit, 1 stop bit. */
UART_Open(UART0, 115200);
printf("\n\n");
printf("+---------------------------------------+\n");
printf("| M051 ACMP Sample Code |\n");
printf("+---------------------------------------+\n");
printf("\nThis sample code demonstrates ACMP0 function. Using ACMP0_P (P1.5) as ACMP0\n");
printf("positive input and using internal band-gap voltage as the negative input\n");
printf("The compare result reflects on ACMP0_O (P3.6)\n");
/* Configure ACMP0. Enable ACMP0 and select internal reference voltage as negative input. */
ACMP_Open(ACMP01, 0, ACMP_CR_VNEG_BANDGAP, ACMP_CR_HYSTERESIS_DISABLE);
/* Enable ACMP0 interrupt function */
ACMP_ENABLE_INT(ACMP01, 0);
/* Enable ACMP01 interrupt */
NVIC_EnableIRQ(ACMP01_IRQn);
while(1);
}
void ACMP01_IRQHandler(void)
{
static uint32_t u32Cnt = 0;
/* Clear ACMP 0 interrupt flag */
ACMP_CLR_INT_FLAG(ACMP01, 0);
/* Check Comparator 0 Output Status */
if(ACMP_GET_OUTPUT(ACMP01, 0))
printf("ACMP0_P voltage > Band-gap voltage (%d)\n", u32Cnt);
else
printf("ACMP0_P voltage <= Band-gap voltage (%d)\n", u32Cnt);
u32Cnt++;
}
void SYS_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Enable external 12MHz XTAL */
CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk);
/* Waiting for clock ready */
CLK_WaitClockReady(CLK_CLKSTATUS_XTL12M_STB_Msk);
/* Select HXT as the clock source of UART */
CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_CLKDIV_UART(1));
/* Enable UART peripheral clock */
CLK_EnableModuleClock(UART0_MODULE);
/* Enable ACMP01 peripheral clock */
CLK_EnableModuleClock(ACMP01_MODULE);
/* Update System Core Clock */
/* User can use SystemCoreClockUpdate() to calculate SystemCoreClock and CyclesPerUs automatically. */
SystemCoreClockUpdate();
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set P1.5 multi-function pin for ACMP0 positive input pin */
SYS->P1_MFP = SYS_MFP_P15_ACMP0_P;
/* Disable digital input path of analog pin ACMP0_P to prevent leakage */
GPIO_DISABLE_DIGITAL_PATH(P1, BIT5);
/* Set P3 multi-function pins for UART0 RXD, TXD and ACMP0 output */
SYS->P3_MFP = SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0 | SYS_MFP_P36_ACMP0_O;
}
/*** (C) COPYRIGHT 2014 Nuvoton Technology Corp. ***/
| 
楼主
标题置顶
标题高亮
