- /**************************************************************************//**
- * [url=home.php?mod=space&uid=288409]@file[/url] main.c
- * [url=home.php?mod=space&uid=895143]@version[/url] V3.00
- * $Revision: 2 $
- * $Date: 14/08/12 6:35p $
- * [url=home.php?mod=space&uid=247401]@brief[/url] Demonstrate how to set GPIO pin mode and use pin data input/output control.
- * @note
- * Copyright (C) 2013 Nuvoton Technology Corp. All rights reserved.
- *
- ******************************************************************************/
- #include "stdio.h"
- #include "M451Series.h"
- uint32_t Volume;
- /*---------------------------------------------------------------------------------------------------------*/
- /* Main Function */
- /*---------------------------------------------------------------------------------------------------------*/
- int32_t main(void)
- {
- SYS_UnlockReg();
- /* 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 clock divider as 1 */
- CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));
- SYS_LockReg();
-
- GPIO_SetMode(PC, BIT2, GPIO_MODE_OUTPUT); //LED4
- GPIO_SetMode(PC, BIT7, GPIO_MODE_OUTPUT); //LED7
-
- //初始化ADC
- CLK_EnableModuleClock(EADC_MODULE);
- SYS->GPB_MFPH &= ~(SYS_GPB_MFPH_PB9MFP_Msk | SYS_GPB_MFPH_PB10MFP_Msk);//配置ADC管脚
- GPIO_DISABLE_DIGITAL_PATH(PB, BIT9); //关闭ADC引脚数字输入通道
- EADC->CTL |= EADC_CTL_ADCEN_Msk; //使能ADC
- EADC->CTL &= (~EADC_CTL_DIFFEN_Msk); //设置ADC转换为单端输入模式
- EADC_ConfigSampleModule(EADC, 0, EADC_SOFTWARE_TRIGGER, 6); //ADC模块0选择通道6
- EADC_ENABLE_SAMPLE_MODULE_INT(EADC, 0, 0x1);//Enable sample module 0 interrupt.
-
- //初始化PWM
- SYS->GPC_MFPL &= ~SYS_GPC_MFPL_PC2MFP_Msk;
- SYS->GPC_MFPL |= SYS_GPC_MFPL_PC2MFP_PWM0_CH2;//配置PWM管脚
- /* Enable PWM module clock */
- CLK_EnableModuleClock(PWM0_MODULE);
- /* Select PWM module clock source */
- CLK_SetModuleClock(PWM0_MODULE, CLK_CLKSEL2_PWM0SEL_PCLK0, 0);//选择PWM时钟源为系统时钟
- /* Reset PWM0 channel 0~5 */
- SYS_ResetModule(PWM0_RST);
- PWM_ConfigOutputChannel(PWM0, 2, 100, 50); //PWM0_CH2频率100Hz，占空比50%
- /* Enable PWM Output path for PWM0 channel 2 */
- PWM_EnableOutput(PWM0, 0x04);
- // Start
- PWM_Start(PWM0, 0x04);
-
- while(1)
- {
- PC->DOUT^=BIT7; //反转IO电平,LED闪烁
- EADC_START_CONV(EADC, 0x1); //AD开始转换
- while(EADC_GET_INT_FLAG(EADC, 0x1) == 0); //等待转换结束
- Volume = EADC_GET_CONV_DATA(EADC, 0); //取出AD转换结果
- EADC_CLR_INT_FLAG(EADC, 0x1); //清AD中断标志
- PWM_ConfigOutputChannel(PWM0,2,100,(Volume*100/4096));//根据AD值调节PWM占空比调节LED亮度
- for(Volume=0;Volume<100000;Volume++);
- }
- }
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