/**************************************************************************//**
* [url=home.php?mod=space&uid=288409]@file[/url] main.c
* [url=home.php?mod=space&uid=895143]@version[/url] V3.00
* $Revision: 6 $
* $Date: 15/09/02 10:04a $
* @brief
* Monitor the conversion result of channel 2 by the digital compare function.
*
* @note
* Copyright (C) 2013~2015 Nuvoton Technology Corp. All rights reserved.
*
******************************************************************************/
#include "stdio.h"
#include "M451Series.h"
#define PLLCTL_SETTING CLK_PLLCTL_72MHz_HXT
#define PLL_CLOCK 72000000
/*---------------------------------------------------------------------------------------------------------*/
/* Define global variables and constants */
/*---------------------------------------------------------------------------------------------------------*/
volatile uint32_t g_u32AdcCmp0IntFlag;
volatile uint32_t g_u32AdcCmp1IntFlag;
/*---------------------------------------------------------------------------------------------------------*/
/* Define functions prototype */
/*---------------------------------------------------------------------------------------------------------*/
int32_t main(void);
void EADC_FunctionTest(void);
void SYS_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Enable HIRC clock (Internal RC 22.1184MHz) */
CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk);
/* Wait for HIRC clock ready */
CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);
/* Select HCLK clock source as HIRC and and HCLK source divider as 1 */
CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));
/* Set PLL to Power-down mode and PLLSTB bit in CLK_STATUS register will be cleared by hardware.*/
CLK_DisablePLL();
/* Enable HXT clock (external XTAL 12MHz) */
CLK_EnableXtalRC(CLK_PWRCTL_HXTEN_Msk);
/* Wait for HXT clock ready */
CLK_WaitClockReady(CLK_STATUS_HXTSTB_Msk);
/* Set core clock as PLL_CLOCK from PLL */
CLK_SetCoreClock(PLL_CLOCK);
/* Enable UART module clock */
CLK_EnableModuleClock(UART0_MODULE);
/* Select UART module clock source as HXT and UART module clock divider as 1 */
CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UARTSEL_HXT, CLK_CLKDIV0_UART(1));
/* Enable EADC module clock */
CLK_EnableModuleClock(EADC_MODULE);
/* EADC clock source is 72MHz, set divider to 8, ADC clock is 72/8 MHz */
CLK_SetModuleClock(EADC_MODULE, 0, CLK_CLKDIV0_EADC(8));
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set PD multi-function pins for UART0 RXD and TXD */
SYS->GPD_MFPL &= ~(SYS_GPD_MFPL_PD0MFP_Msk | SYS_GPD_MFPL_PD1MFP_Msk);
SYS->GPD_MFPL |= (SYS_GPD_MFPL_PD0MFP_UART0_RXD | SYS_GPD_MFPL_PD1MFP_UART0_TXD);
/* Configure the GPB0 - GPB3 ADC analog input pins. */
SYS->GPB_MFPL &= ~(SYS_GPB_MFPL_PB0MFP_Msk | SYS_GPB_MFPL_PB1MFP_Msk |
SYS_GPB_MFPL_PB2MFP_Msk | SYS_GPB_MFPL_PB3MFP_Msk);
SYS->GPB_MFPL |= (SYS_GPB_MFPL_PB0MFP_EADC_CH0 | SYS_GPB_MFPL_PB1MFP_EADC_CH1 |
SYS_GPB_MFPL_PB2MFP_EADC_CH2 | SYS_GPB_MFPL_PB3MFP_EADC_CH3);
/* Disable the GPB0 - GPB3 digital input path to avoid the leakage current. */
GPIO_DISABLE_DIGITAL_PATH(PB, 0xF);
}
void UART0_Init()
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init UART */
/*---------------------------------------------------------------------------------------------------------*/
/* Reset UART IP */
SYS->IPRST1 |= SYS_IPRST1_UART0RST_Msk;
SYS->IPRST1 &= ~SYS_IPRST1_UART0RST_Msk;
/* Configure UART0 and set UART0 baud rate */
UART0->BAUD = UART_BAUD_MODE2 | UART_BAUD_MODE2_DIVIDER(__HXT, 115200);
UART0->LINE = UART_WORD_LEN_8 | UART_PARITY_NONE | UART_STOP_BIT_1;
}
/*---------------------------------------------------------------------------------------------------------*/
/* EADC function test */
/*---------------------------------------------------------------------------------------------------------*/
void EADC_FunctionTest()
{
printf("\n");
printf("+----------------------------------------------------------------------+\n");
printf("| EADC compare function (result monitor) sample code |\n");
printf("+----------------------------------------------------------------------+\n");
printf("\nIn this test, software will compare the conversion result of channel 2.\n");
/* Set the ADC internal sampling time, input mode as single-end and enable the A/D converter */
EADC_Open(EADC, EADC_CTL_DIFFEN_SINGLE_END);
EADC_SetInternalSampleTime(EADC, 6);
/* Configure the sample module 0 for analog input channel 2 and ADINT0 trigger source */
EADC_ConfigSampleModule(EADC, 0, EADC_ADINT0_TRIGGER, 2);
/* Enable EADC comparator 0. Compare condition: conversion result < 0x800; match Count=5 */
printf(" Set the compare condition of comparator 0: channel 2 is less than 0x800; match count is 5.\n");
EADC_ENABLE_CMP0(EADC, 0, EADC_CMP_CMPCOND_LESS_THAN, 0x800, 0x5);
/* Enable EADC comparator 1. Compare condition: conversion result >= 0x800; match Count=5 */
printf(" Set the compare condition of comparator 1 : channel 2 is greater than or equal to 0x800; match count is 5.\n");
EADC_ENABLE_CMP1(EADC, 0, EADC_CMP_CMPCOND_GREATER_OR_EQUAL, 0x800, 0x5);
/* Enable sample module 0 interrupt */
EADC_ENABLE_SAMPLE_MODULE_INT(EADC, 0, 0x1);
/* Clear the A/D ADINT3 interrupt flag for safe */
EADC_CLR_INT_FLAG(EADC, (0x1 << 3));
/* Enable ADINT3 interrupt */
EADC_ENABLE_INT(EADC, (0x1 << 3));
NVIC_EnableIRQ(ADC03_IRQn);
/* Clear the EADC comparator 0 interrupt flag for safe */
EADC_CLR_INT_FLAG(EADC, (0x1 << 4));
/* Enable ADC comparator 0 interrupt */
EADC_ENABLE_CMP_INT(EADC, 0);
/* Clear the EADC comparator 1 interrupt flag for safe */
EADC_CLR_INT_FLAG(EADC, (0x1 << 5));
/* Enable ADC comparator 1 interrupt */
EADC_ENABLE_CMP_INT(EADC, 1);
/* Reset the EADC interrupt indicator and trigger sample module 0 to start A/D conversion */
g_u32AdcCmp0IntFlag = 0;
g_u32AdcCmp1IntFlag = 0;
EADC_START_CONV(EADC, 0x1);
/* Wait EADC compare interrupt */
while((g_u32AdcCmp0IntFlag == 0) && (g_u32AdcCmp1IntFlag == 0));
/* Disable the sample module 0 interrupt */
EADC_DISABLE_SAMPLE_MODULE_INT(EADC, 0, 0x1);
/* Disable ADC comparator interrupt */
EADC_DISABLE_CMP_INT(EADC, 0);
EADC_DISABLE_CMP_INT(EADC, 1);
/* Disable compare function */
EADC_DISABLE_CMP0(EADC);
EADC_DISABLE_CMP1(EADC);
if(g_u32AdcCmp0IntFlag == 1)
{
printf("Comparator 0 interrupt occurs.\nThe conversion result of channel 2 is less than 0x800\n");
}
else
{
printf("Comparator 1 interrupt occurs.\nThe conversion result of channel 2 is greater than or equal to 0x800\n");
}
}
/*---------------------------------------------------------------------------------------------------------*/
/* EADC interrupt handler */
/*---------------------------------------------------------------------------------------------------------*/
void ADC03_IRQHandler(void)
{
if(EADC_GET_INT_FLAG(EADC, (0x1 << 4)))
{
g_u32AdcCmp0IntFlag = 1;
EADC_CLR_INT_FLAG(EADC, (0x1 << 4));/* Clear the A/D compare flag 0 */
}
if(EADC_GET_INT_FLAG(EADC, (0x1 << 5)))
{
g_u32AdcCmp1IntFlag = 1;
EADC_CLR_INT_FLAG(EADC, (0x1 << 5));/* Clear the A/D compare flag 1 */
}
}
/*---------------------------------------------------------------------------------------------------------*/
/* Main Function */
/*---------------------------------------------------------------------------------------------------------*/
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();
/* Init UART0 for printf */
UART0_Init();
/*---------------------------------------------------------------------------------------------------------*/
/* SAMPLE CODE */
/*---------------------------------------------------------------------------------------------------------*/
printf("\nSystem clock rate: %d Hz", SystemCoreClock);
/* EADC function test */
EADC_FunctionTest();
/* Reset EADC module */
SYS_ResetModule(EADC_RST);
/* Disable EADC IP clock */
CLK_DisableModuleClock(EADC_MODULE);
/* Disable External Interrupt */
NVIC_DisableIRQ(ADC00_IRQn);
printf("Exit EADC sample code\n");
while(1);
}
楼主
标题置顶
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放心吧 .新唐的adc还是非常给力的 
