/******************************************************************************
* [url=home.php?mod=space&uid=288409]@file[/url] main.c
* [url=home.php?mod=space&uid=895143]@version[/url] V1.00
* $Revision: 2 $
* $Date: 15/09/24 5:50p $
* [url=home.php?mod=space&uid=247401]@brief[/url] Demonstrate ADC function by repeatedly convert the input of ADC
* channel 5 (P1.5) and shows the result on UART console.
*
* @note
* Copyright (C) 2015 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_ADF_INT);
// Get ADC convert result
printf("Convert result is %x\n", (uint32_t)ADC_GET_CONVERSION_DATA(ADC, 0));
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_XTAL1 | SYS_MFP_P51_XTAL2;
/* Enable external 12MHz XTAL, HIRC */
CLK->PWRCON = CLK_PWRCON_OSC22M_EN_Msk | CLK_PWRCON_HXT;
/* Waiting for clock ready */
CLK_WaitClockReady(CLK_CLKSTATUS_OSC22M_STB_Msk | CLK_CLKSTATUS_XTL_STB_Msk);
/* Switch HCLK clock source to XTL */
CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_XTAL,CLK_CLKDIV_HCLK(1));
/* Enable IP clock */
CLK_EnableModuleClock(UART_MODULE);
CLK_EnableModuleClock(ADC_MODULE);
/* Select IP clock source */
CLK_SetModuleClock(UART_MODULE,CLK_CLKSEL1_UART_S_XTAL,CLK_CLKDIV_UART(1));
CLK_SetModuleClock(ADC_MODULE,CLK_CLKSEL1_ADC_S_XTAL,CLK_CLKDIV_ADC(6));
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set P0 multi-function pins for UART RXD, TXD */
SYS->P0_MFP = SYS_MFP_P00_TXD | SYS_MFP_P01_RXD;
/* Set P1 multi-function pin ADC channel 5 input*/
SYS->P1_MFP = SYS_MFP_P15_AIN5;
/* Analog pin OFFD to prevent leakage */
P1->OFFD |= (1 << 5) << GPIO_OFFD_OFFD_Pos;
/* To update the variable SystemCoreClock */
SystemCoreClockUpdate();
/* 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(UART0, 115200);
printf("\nThis sample code demonstrate ADC channel 5 conversion and printf the result on UART\n");
// Enable channel 5
ADC_Open(ADC, 0, 0, 0x01 << 5);
// Power on ADC
ADC_POWER_ON(ADC);
// Enable ADC convert complete interrupt
ADC_EnableInt(ADC, ADC_ADF_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 2015 Nuvoton Technology Corp. ***/
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