- /**************************************************************************//**
- * [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] Perform A/D Conversion with ADC burst mode.
- *
- * 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 */
- /*---------------------------------------------------------------------------------------------------------*/
- #define CONV_TOTAL_COUNT 20
- 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;
- uint32_t u32ConvCount;
- int32_t i32ConversionData[CONV_TOTAL_COUNT];
- printf("\n");
- printf("+----------------------------------------------------------------------+\n");
- printf("| ADC burst mode sample code |\n");
- printf("+----------------------------------------------------------------------+\n");
- for(u32ConvCount = 0; u32ConvCount < CONV_TOTAL_COUNT; u32ConvCount++)
- {
- i32ConversionData[u32ConvCount] = 0;
- }
- /* 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 burst mode test\n");
- u8Option = getchar();
- if(u8Option == '1')
- {
- /* Set input mode as single-end, burst mode, and select channel 2 */
- ADC_Open(ADC, ADC_ADCR_DIFFEN_SINGLE_END, ADC_ADCR_ADMD_BURST, BIT2);
- /* Clear the A/D interrupt flag for safe */
- ADC_CLR_INT_FLAG(ADC, ADC_ADF_INT);
- /* Reset the ADC interrupt indicator and trigger sample module to start A/D conversion */
- u32ConvCount = 0;
- ADC_START_CONV(ADC);
- while(1)
- {
- /* Wait ADC conversion completed */
- while (ADC_GET_INT_FLAG(ADC, ADC_ADF_INT)==0);
- ADC_CLR_INT_FLAG(ADC, ADC_ADF_INT); /* clear ADF interrupt flag */
- /* Get the conversion result until VALIDF turns to 0 */
- while(ADC->ADSR0 & ADC_ADSR0_VALIDF_Msk)
- {
- /* Get the conversion result from ADC channel 0 always */
- i32ConversionData[u32ConvCount++] = ADC_GET_CONVERSION_DATA(ADC, 0);
- if(u32ConvCount == CONV_TOTAL_COUNT)
- break;
- }
- if(u32ConvCount == CONV_TOTAL_COUNT)
- break;
- }
- /* Stop A/D conversion */
- ADC_STOP_CONV(ADC);
- /* Show the conversion result */
- for(u32ConvCount = 0; u32ConvCount < CONV_TOTAL_COUNT; u32ConvCount++)
- {
- printf("Conversion result of channel 2 [#%d]: 0x%X (%d)\n", u32ConvCount+1, i32ConversionData[u32ConvCount], i32ConversionData[u32ConvCount]);
- }
- /* Clear remaining data in FIFO that got before stop ADC */
- while (ADC_IS_DATA_VALID(ADC, 0))
- {
- i32ConversionData[0] = ADC_GET_CONVERSION_DATA(ADC, 0);
- }
- }
- else if(u8Option == '2')
- {
- /* Set input mode as differential, burst mode, and select channel 2 */
- ADC_Open(ADC, ADC_ADCR_DIFFEN_DIFFERENTIAL, ADC_ADCR_ADMD_BURST, BIT2);
- /* Clear the A/D interrupt flag for safe */
- ADC_CLR_INT_FLAG(ADC, ADC_ADF_INT);
- /* Reset the ADC interrupt indicator and trigger sample module to start A/D conversion */
- u32ConvCount = 0;
- ADC_START_CONV(ADC);
- while(1)
- {
- /* Wait ADC conversion completed */
- while (ADC_GET_INT_FLAG(ADC, ADC_ADF_INT)==0);
- ADC_CLR_INT_FLAG(ADC, ADC_ADF_INT); /* clear ADF interrupt flag */
- /* Get the conversion result until VALIDF turns to 0 */
- while(ADC->ADSR0 & ADC_ADSR0_VALIDF_Msk)
- {
- /* Get the conversion result from ADC channel 0 always */
- i32ConversionData[u32ConvCount++] = ADC_GET_CONVERSION_DATA(ADC, 0);
- if(u32ConvCount == CONV_TOTAL_COUNT)
- break;
- }
- if(u32ConvCount == CONV_TOTAL_COUNT)
- break;
- }
- /* Stop A/D conversion */
- ADC_STOP_CONV(ADC);
- /* Show the conversion result */
- for(u32ConvCount = 0; u32ConvCount < CONV_TOTAL_COUNT; u32ConvCount++)
- {
- printf("Conversion result of channel pair 1 [#%d]: 0x%X (%d)\n", u32ConvCount+1, i32ConversionData[u32ConvCount], i32ConversionData[u32ConvCount]);
- }
- /* Clear remaining data in FIFO that got before stop ADC */
- while (ADC_IS_DATA_VALID(ADC, 0))
- {
- i32ConversionData[0] = ADC_GET_CONVERSION_DATA(ADC, 0);
- }
- }
- else
- return;
- printf("\n");
- }
- }
- /*----------------------------------------------------------------------*/
- /* 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);
- printf("Exit ADC sample code\n");
- while(1);
- }