- /**************************************************************************//**
- * [url=home.php?mod=space&uid=288409]@file[/url] main.c
- * [url=home.php?mod=space&uid=895143]@version[/url] V3.00
- * [url=home.php?mod=space&uid=247401]@brief[/url] Trigger ADC by writing ADC software trigger register.
- *
- * SPDX-License-Identifier: Apache-2.0
- * [url=home.php?mod=space&uid=17282]@CopyRight[/url] (C) 2020 Nuvoton Technology Corp. All rights reserved.
- ******************************************************************************/
- #include <stdio.h>
- #include "NuMicro.h"
- /*---------------------------------------------------------------------------------------------------------*/
- /* Define global variables and constants */
- /*---------------------------------------------------------------------------------------------------------*/
- volatile uint32_t g_u32AdcIntFlag;
- void SYS_Init(void)
- {
- /* Unlock protected registers */
- SYS_UnlockReg();
- /* Enable HIRC */
- CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk);
- /* Waiting for HIRC clock ready */
- CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);
- /* Switch HCLK clock source to HIRC */
- CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));
- /* Set both PCLK0 and PCLK1 as HCLK/2 */
- CLK->PCLKDIV = (CLK_PCLKDIV_APB0DIV_DIV2 | CLK_PCLKDIV_APB1DIV_DIV2);
- /* Switch UART0 clock source to HIRC */
- CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART0SEL_HIRC, CLK_CLKDIV0_UART0(1));
- /* Enable UART peripheral clock */
- CLK_EnableModuleClock(UART0_MODULE);
- /* Enable ADC module clock */
- CLK_EnableModuleClock(ADC_MODULE);
- /* ADC clock source is PCLK1, set divider to 1 */
- CLK_SetModuleClock(ADC_MODULE, CLK_CLKSEL2_ADCSEL_PCLK1, CLK_CLKDIV0_ADC(1));
- /* Update System Core Clock */
- /* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CycylesPerUs automatically. */
- SystemCoreClockUpdate();
- /*----------------------------------------------------------------------*/
- /* Init I/O Multi-function */
- /*----------------------------------------------------------------------*/
- /* Set GPB multi-function pins for UART0 RXD and TXD */
- SYS->GPB_MFPH = (SYS->GPB_MFPH & ~(SYS_GPB_MFPH_PB12MFP_Msk | SYS_GPB_MFPH_PB13MFP_Msk)) |
- (SYS_GPB_MFPH_PB12MFP_UART0_RXD | SYS_GPB_MFPH_PB13MFP_UART0_TXD);
- /* Set PB.2 - PB.3 to input mode */
- GPIO_SetMode(PB, BIT2|BIT3, GPIO_MODE_INPUT);
- /* Configure the PB.2 - PB.3 ADC analog input pins. */
- SYS->GPB_MFPL = (SYS->GPB_MFPL & ~(SYS_GPB_MFPL_PB2MFP_Msk | SYS_GPB_MFPL_PB3MFP_Msk)) |
- (SYS_GPB_MFPL_PB2MFP_ADC0_CH2 | SYS_GPB_MFPL_PB3MFP_ADC0_CH3);
- /* Disable the PB.2 - PB.3 digital input path to avoid the leakage current. */
- GPIO_DISABLE_DIGITAL_PATH(PB, BIT2|BIT3);
- /* Lock protected registers */
- SYS_LockReg();
- }
- void ADC_FunctionTest()
- {
- uint8_t u8Option;
- int32_t i32ConversionData;
- printf("\n");
- printf("+----------------------------------------------------------------------+\n");
- printf("| ADC Software trigger mode test |\n");
- printf("+----------------------------------------------------------------------+\n");
- /* Enable ADC converter */
- ADC_POWER_ON(ADC);
- while(1)
- {
- printf("Select input mode:\n");
- printf(" [1] Single end input (channel 2 only)\n");
- printf(" [2] Differential input (channel pair 1 only)\n");
- printf(" Other keys: exit single mode test\n");
- u8Option = getchar();
- if(u8Option == '1')
- {
- /* Set input mode as single-end, Single-cycle scan mode, and select channel 2 */
- ADC_Open(ADC, ADC_ADCR_DIFFEN_SINGLE_END, ADC_ADCR_ADMD_SINGLE_CYCLE, BIT2);
- /* Clear the A/D interrupt flag for safe */
- ADC_CLR_INT_FLAG(ADC, ADC_ADF_INT);
- /* Enable the sample module interrupt */
- ADC_ENABLE_INT(ADC, ADC_ADF_INT); /* Enable sample module A/D interrupt. */
- NVIC_EnableIRQ(ADC_IRQn);
- /* Reset the ADC interrupt indicator and trigger sample module 0 to start A/D conversion */
- g_u32AdcIntFlag = 0;
- ADC_START_CONV(ADC);
- /* Wait ADC interrupt (g_u32AdcIntFlag will be set at IRQ_Handler function) */
- while(g_u32AdcIntFlag == 0);
- /* Disable the sample module interrupt */
- ADC_DISABLE_INT(ADC, ADC_ADF_INT);
- /* Get the conversion result of ADC channel 2 */
- i32ConversionData = ADC_GET_CONVERSION_DATA(ADC, 2);
- printf("Conversion result of channel 2: 0x%X (%d)\n\n", i32ConversionData, i32ConversionData);
- }
- else if(u8Option == '2')
- {
- /* Set input mode as differential, Single-cycle scan mode, and select channel 2 */
- ADC_Open(ADC, ADC_ADCR_DIFFEN_DIFFERENTIAL, ADC_ADCR_ADMD_SINGLE_CYCLE, BIT2);
- /* Clear the A/D interrupt flag for safe */
- ADC_CLR_INT_FLAG(ADC, ADC_ADF_INT);
- /* Enable the sample module interrupt */
- ADC_ENABLE_INT(ADC, ADC_ADF_INT); /* Enable sample module A/D interrupt. */
- NVIC_EnableIRQ(ADC_IRQn);
- /* Reset the ADC indicator and trigger sample module to start A/D conversion */
- g_u32AdcIntFlag = 0;
- ADC_START_CONV(ADC);
- /* Wait ADC interrupt (g_u32AdcIntFlag will be set at IRQ_Handler function) */
- while(g_u32AdcIntFlag == 0);
- /* Disable the sample module interrupt */
- ADC_DISABLE_INT(ADC, ADC_ADF_INT);
- /* Get the conversion result of channel 2 */
- i32ConversionData = ADC_GET_CONVERSION_DATA(ADC, 2);
- printf("Conversion result of channel pair 1: 0x%X (%d)\n\n", i32ConversionData, i32ConversionData);
- }
- else
- return ;
- }
- }
- void ADC_IRQHandler(void)
- {
- g_u32AdcIntFlag = 1;
- ADC_CLR_INT_FLAG(ADC, ADC_ADF_INT); /* Clear the A/D interrupt flag */
- }
- /*----------------------------------------------------------------------*/
- /* Init UART0 */
- /*----------------------------------------------------------------------*/
- void UART0_Init(void)
- {
- /* Reset UART0 */
- SYS_ResetModule(UART0_RST);
- /* Configure UART0 and set UART0 baud rate */
- UART_Open(UART0, 115200);
- }
- int32_t main(void)
- {
- /* Init System, IP clock and multi-function I/O. */
- SYS_Init();
- /* Init UART0 for printf */
- UART0_Init();
- printf("\nSystem clock rate: %d Hz", SystemCoreClock);
- /* ADC function test */
- ADC_FunctionTest();
- /* Disable ADC IP clock */
- CLK_DisableModuleClock(ADC_MODULE);
- /* Disable External Interrupt */
- NVIC_DisableIRQ(ADC_IRQn);
- printf("Exit ADC sample code\n");
- while(1);
- }
程序的主要功能是通过写入ADC软件触发寄存器来触发ADC(模数转换器)并进行采样,然后根据用户选择的输入模式输出ADC的转换结果。
- /*---------------------------------------------------------------------------------------------------------*/
- /* Define global variables and constants */
- /*---------------------------------------------------------------------------------------------------------*/
- volatile uint32_t g_u32AdcIntFlag;
定义了一个全局变量g_u32AdcIntFlag,用于标志ADC的中断是否发生。
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