/******************************************************************************
* [url=home.php?mod=space&uid=288409]@file[/url] main.c
* [url=home.php?mod=space&uid=895143]@version[/url] V0.10
* $Revision: 2 $
* $Date: 14/01/28 11:43a $
* [url=home.php?mod=space&uid=247401]@brief[/url] ADC and PWM sample for M051 learning board
*
* @note
* Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
*****************************************************************************/
#include <stdio.h>
#include "M051Series.h"
#include "lcd_driver.h"
void SYS_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Unlock protected registers */
SYS_UnlockReg();
/* Enable ADC and PWM23 clock */
CLK->APBCLK = CLK_APBCLK_PWM23_EN_Msk | CLK_APBCLK_ADC_EN_Msk;
/* 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 P4.3 to PWM3 function */
SYS->P4_MFP = SYS_MFP_P43_PWM3;
/* Set P1.0 to AIN0 function */
SYS->P1_MFP = SYS_MFP_P10_AIN0;
/* Disable digital input path of analog pin AIN0 to prevent leakage */
P1->OFFD |= 1 << GPIO_OFFD_OFFD_Pos;
/* Lock protected registers */
SYS_LockReg();
}
void PWM_Init(void)
{
/* Set PWM 3 clock prescale to 60, and divider to 1*/
PWMA->PPR = 60 << PWM_PPR_CP23_Pos;
PWMA->CSR = PWM_CLK_DIV_1 << PWM_CSR_CSR3_Pos;
/* Enable PWM3 and set to auto-reload mode.
Configure PWM mode before setting CNR, CMR. Otherwise CNR will be reset */
PWMA->PCR = PWM_PCR_CH3EN_Msk | PWM_PCR_CH3MOD_Msk;
/* PWM 3 frequency = HCLK / (prescale * divider * (CNR + 1))
PWM 3 duty ratio = (CMR + 1) / (CNR + 1) */
PWMA->CNR3 = 1843 - 1;
PWMA->CMR3 = 1833 - 1;
/* Enable PWM3 Output */
PWMA->POE = PWM_POE_PWM3_Msk;
}
void ADC_Init(void)
{
/* Set to convert ADC channel 0 */
ADC->ADCHER = 0x1;
/* Enable the ADC converter */
ADC->ADCR = ADC_ADCR_ADEN_Msk;
}
/* Main function */
int main(void)
{
uint32_t u32Data, u32Sum, u32Count;
char adc_value[20];
/* 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();
/* Initial LCD panel. SPI clock and interface is configured in this function. */
LCD_Init();
/* Clear LCD screen. Do this before turn back light on */
LCD_ClearScreen();
/* Enable LCD back light */
LCD_EnableBackLight();
/* Show messages on LCD */
LCD_Print(0, "ADC_PWM");
LCD_Print(1, "Sample code");
LCD_Print(2, "ADC Value:");
/* Init PWM channel 3 */
PWM_Init();
/* Init ADC to get the value of variable resistor */
ADC_Init();
u32Count = 0;
u32Sum = 0;
while(1)
{
/* Start convert */
ADC_START_CONV(ADC);
/* Waiting for convert complete */
while(ADC_IS_BUSY(ADC));
/* Read the result from ADC */
u32Data = ADC->ADDR[0] & ADC_ADDR_RSLT_Msk;
/* Determine the sum */
u32Sum += u32Data;
u32Count++;
if(u32Count == 128)
{
/* Determine the average */
u32Data = u32Sum / 128;
/* Update the average ADC conversion result to LCD */
sprintf(adc_value, " %4d", u32Data);
LCD_Print(3, adc_value);
/* Adjust the duty cycle of PWM3 according to the average ADC value. */
PWMA->CMR3 = (u32Data * PWMA->CNR3) / 4096;
/* Reset count and sum */
u32Count = 0;
u32Sum = 0;
}
}
}
/*** (C) COPYRIGHT 2014 Nuvoton Technology Corp. ***/
| 
楼主
标题置顶
标题高亮
