/******************************************************************************
* [url=home.php?mod=space&uid=288409]@file[/url] main.c
* [url=home.php?mod=space&uid=895143]@version[/url] V3.00
* $Revision: 5 $
* $Date: 15/10/06 1:19p $
* [url=home.php?mod=space&uid=247401]@brief[/url] Demonstrate Analog comparator (ACMP) comparison by comparing
* CPP0 (P1.5) with Band-gap voltage and shows the result on UART console.
*
* @note
* Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
*****************************************************************************/
#include <stdio.h>
#include "Mini51Series.h"
/* Function prototype declaration */
void SYS_Init(void);
int32_t main(void)
{
/* Init System, IP clock and multi-function I/O
In the end of SYS_Init() will issue SYS_LockReg()
to lock protected register. If user want to write
protected register, please issue SYS_UnlockReg()
to unlock protected register if necessary. */
SYS_Init();
/* Configure UART0: 115200, 8-bit word, no parity bit, 1 stop bit. */
UART_Open(UART, 115200);
printf("\n\n");
printf("+---------------------------------------+\n");
printf("| Mini51 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(ACMP, 0, ACMP_VNEG_BANDGAP, ACMP_HYSTERESIS_DISABLE);
/* Enable ACMP0 interrupt function */
ACMP_ENABLE_INT(ACMP, 0);
/* Enable ACMP01 interrupt */
NVIC_EnableIRQ(ACMP_IRQn);
while(1);
}
void ACMP_IRQHandler(void)
{
static uint32_t u32Cnt = 0;
/* Clear ACMP 0 interrupt flag */
ACMP_CLR_INT_FLAG(ACMP, 0);
/* Check Comparator 0 Output Status */
if(ACMP_GET_OUTPUT(ACMP, 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 */
/*---------------------------------------------------------------------------------------------------------*/
/* Register write-protection disabled */
SYS_UnlockReg();
/* Set P5 multi-function pins for XTAL1 and XTAL2 */
SYS->P5_MFP &= ~(SYS_MFP_P50_Msk | SYS_MFP_P51_Msk);
SYS->P5_MFP |= (SYS_MFP_P50_XTAL1 | SYS_MFP_P51_XTAL2);
/* Enable external 12MHz XTAL (UART), internal 22.1184MHz */
CLK->PWRCON = CLK_PWRCON_XTL12M | CLK_PWRCON_IRC22M_EN_Msk;
/* Waiting for clock ready */
CLK_WaitClockReady(CLK_CLKSTATUS_XTL_STB_Msk | CLK_CLKSTATUS_IRC22M_STB_Msk);
/* Enable UART and ACMP clock */
CLK->APBCLK = CLK_APBCLK_UART_EN_Msk | CLK_APBCLK_CMP_EN_Msk;
/* Select UART clock source from external crystal*/
CLK->CLKSEL1 = (CLK->CLKSEL1 & ~CLK_CLKSEL1_UART_S_Msk) | CLK_CLKSEL1_UART_S_XTAL;
/* Update System Core Clock */
/* User can use SystemCoreClockUpdate() to calculate SystemCoreClock and CycylesPerUs automatically. */
SystemCoreClockUpdate();
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set P1.5 multi-function pin for ACMP0 positive input pin */
SYS->P1_MFP = SYS_MFP_P15_CPP0;
/* Disable digital input path of analog pin ACMP0_P to prevent leakage */
GPIO_DISABLE_DIGITAL_PATH(P1, (1 << 5));
/* Set P1 multi-function pins for UART RXD, TXD */
SYS->P0_MFP = SYS_MFP_P00_TXD | SYS_MFP_P01_RXD;
/* Register write-protection enabled */
SYS_LockReg();
}
/*** (C) COPYRIGHT 2014 Nuvoton Technology Corp. ***/
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