/******************************************************************************
* @file main.c
* @version V1.00
* $Revision: 6 $
* $Date: 15/10/06 1:19p $
* @brief Demonstrate ADC conversion and comparison function by monitoring
* the conversion result of channel 0.
*
* @note
* Copyright (C) 2013 Nuvoton Technology Corp. All rights reserved.
*****************************************************************************/
#include <stdio.h>
#include "Mini51Series.h"
void ADC_IRQHandler(void)
{
uint32_t u32Flag;
// Get ADC comparator interrupt flag
u32Flag = ADC_GET_INT_FLAG(ADC, ADC_CMP0_INT | ADC_CMP1_INT);
if(u32Flag & ADC_CMP0_INT)
printf("Channel 0 input < 0x200\n");
if(u32Flag & ADC_CMP1_INT)
printf("Channel 0 input >= 0x200\n");
ADC_CLR_INT_FLAG(ADC, u32Flag);
}
void SYS_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Unlock protected registers */
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 ADC clock */
CLK->APBCLK = CLK_APBCLK_UART_EN_Msk | CLK_APBCLK_ADC_EN_Msk;
/* Select UART clock source from external crystal*/
CLK->CLKSEL1 = (CLK->CLKSEL1 & ~CLK_CLKSEL1_UART_S_Msk) | CLK_CLKSEL1_UART_S_XTAL;
/* ADC clock source is 22.1184MHz, set divider to (3 + 1), ADC clock is 22.1184/4 MHz */
CLK->CLKDIV |= (3 << CLK_CLKDIV_ADC_N_Pos);
/* Update System Core Clock */
/* User can use SystemCoreClockUpdate() to calculate SystemCoreClock and CycylesPerUs automatically. */
SystemCoreClockUpdate();
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set P1 multi-function pins for UART RXD, TXD */
SYS->P0_MFP = SYS_MFP_P00_TXD | SYS_MFP_P01_RXD;
/* Set P5.3 to ADC channel 0 input pin */
SYS->P5_MFP = SYS_MFP_P53_AIN0;
/* Analog pin OFFD to prevent leakage */
P5->OFFD |= (1 << 3) << GPIO_OFFD_OFFD_Pos;
/* Lock protected registers */
SYS_LockReg();
}
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();
/* Init UART to 115200-8n1 for print message */
UART_Open(UART, 115200);
printf("\nThis sample code demonstrate ADC conversion and comparison function\n");
printf("by monitoring the conversion result of channel 0 (P5.3)\n");
// Enable channel 0
ADC_Open(ADC, 0, 0, 0x01);
// Power on ADC
ADC_POWER_ON(ADC);
// Configure and enable Comparator 0 to monitor channel 0 input less than 0x200
ADC_ENABLE_CMP0(ADC, 0, ADC_CMP_LESS_THAN, 0x200, 16);
// Configure and enable Comparator 1 to monitor channel 0 input greater or equal to 0x200
ADC_ENABLE_CMP1(ADC, 0, ADC_CMP_GREATER_OR_EQUAL_TO, 0x200, 16);
// Enable ADC comparator 0 and 1 interrupt
ADC_EnableInt(ADC, ADC_CMP0_INT);
ADC_EnableInt(ADC, ADC_CMP1_INT);
NVIC_EnableIRQ(ADC_IRQn);
while(1) {
// Trigger ADC conversion if it is idle
if(!ADC_IS_BUSY(ADC)) {
ADC_START_CONV(ADC);
}
}
}
/*** (C) COPYRIGHT 2013 Nuvoton Technology Corp. ***/
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