- /****************************************************************************
- * [url=home.php?mod=space&uid=288409]@file[/url] main.c
- * [url=home.php?mod=space&uid=895143]@version[/url] V3.0
- * $Revision: 7 $
- * $Date: 14/07/10 9:52a $
- * [url=home.php?mod=space&uid=247401]@brief[/url] M051 Series ADC Interface Controller Driver Sample Code
- *
- * @note
- * Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
- *
- ******************************************************************************/
- #include <stdio.h>
- #include "M051Series.h"
- #define PLL_CLOCK 50000000
- /*---------------------------------------------------------------------------------------------------------*/
- /* Define Function Prototypes */
- /*---------------------------------------------------------------------------------------------------------*/
- void SYS_Init(void);
- void UART0_Init(void);
- void AdcBurstModeTest(void);
- /*---------------------------------------------------------------------------------------------------------*/
- /* Define global variables and constants */
- /*---------------------------------------------------------------------------------------------------------*/
- #define BURST_COUNT 20
- volatile uint32_t g_u32AdcDataCount;
- uint16_t g_au16AdcData[BURST_COUNT];
- void SYS_Init(void)
- {
- /*---------------------------------------------------------------------------------------------------------*/
- /* Init System Clock */
- /*---------------------------------------------------------------------------------------------------------*/
- /* Enable Internal RC 22.1184MHz clock */
- CLK_EnableXtalRC(CLK_PWRCON_OSC22M_EN_Msk);
- /* Waiting for Internal RC clock ready */
- CLK_WaitClockReady(CLK_CLKSTATUS_OSC22M_STB_Msk);
- /* Switch HCLK clock source to Internal RC and HCLK source divide 1 */
- CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HIRC, CLK_CLKDIV_HCLK(1));
- /* Enable external XTAL 12MHz clock */
- CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk);
- /* Waiting for external XTAL clock ready */
- CLK_WaitClockReady(CLK_CLKSTATUS_XTL12M_STB_Msk);
- /* Set core clock as PLL_CLOCK from PLL */
- CLK_SetCoreClock(PLL_CLOCK);
- /* Enable UART module clock */
- CLK_EnableModuleClock(UART0_MODULE);
- /* Enable ADC module clock */
- CLK_EnableModuleClock(ADC_MODULE);
- /* Select UART module clock source */
- CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_CLKDIV_UART(1));
- /* ADC clock source is 22.1184MHz, set divider to 7, ADC clock is 22.1184/7 MHz */
- CLK_SetModuleClock(ADC_MODULE, CLK_CLKSEL1_ADC_S_HIRC, CLK_CLKDIV_ADC(7));
- /*---------------------------------------------------------------------------------------------------------*/
- /* Init I/O Multi-function */
- /*---------------------------------------------------------------------------------------------------------*/
- /* Set P3 multi-function pins for UART0 RXD and TXD */
- SYS->P3_MFP &= ~(SYS_MFP_P30_Msk | SYS_MFP_P31_Msk);
- SYS->P3_MFP |= SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0;
- /* Disable the P1.0 - P1.3 digital input path to avoid the leakage current */
- GPIO_DISABLE_DIGITAL_PATH(P1, 0xF);
- /* Configure the P1.0 - P1.3 ADC analog input pins */
- SYS->P1_MFP &= ~(SYS_MFP_P10_Msk | SYS_MFP_P11_Msk | SYS_MFP_P12_Msk | SYS_MFP_P13_Msk);
- SYS->P1_MFP |= SYS_MFP_P10_AIN0 | SYS_MFP_P11_AIN1 | SYS_MFP_P12_AIN2 | SYS_MFP_P13_AIN3 ;
- }
- /*---------------------------------------------------------------------------------------------------------*/
- /* Init UART */
- /*---------------------------------------------------------------------------------------------------------*/
- void UART0_Init()
- {
- /* Reset IP */
- SYS_ResetModule(UART0_RST);
- /* Configure UART0 and set UART0 Baudrate */
- UART_Open(UART0, 115200);
- }
- /*---------------------------------------------------------------------------------------------------------*/
- /* Function: ADC_GetConversionRate */
- /* */
- /* Parameters: */
- /* None. */
- /* */
- /* Returns: */
- /* Return the A/D conversion rate (sample/second) */
- /* */
- /* Description: */
- /* The conversion rate depends on the clock source of ADC clock. */
- /* It only needs 21 ADC clocks to complete an A/D conversion. */
- /*---------------------------------------------------------------------------------------------------------*/
- static __INLINE uint32_t ADC_GetConversionRate()
- {
- uint32_t u32AdcClkSrcSel;
- uint32_t u32ClkTbl[4] = {__HXT, 0, 0, __HIRC};
- /* Set the PLL clock frequency */
- u32ClkTbl[1] = PllClock;
- /* Set the system core clock frequency */
- u32ClkTbl[2] = SystemCoreClock;
- /* Get the clock source setting */
- u32AdcClkSrcSel = ((CLK->CLKSEL1 & CLK_CLKSEL1_ADC_S_Msk) >> CLK_CLKSEL1_ADC_S_Pos);
- /* Return the ADC conversion rate */
- return ((u32ClkTbl[u32AdcClkSrcSel]) / (((CLK->CLKDIV & CLK_CLKDIV_ADC_N_Msk) >> CLK_CLKDIV_ADC_N_Pos) + 1) / 21);
- }
- /*---------------------------------------------------------------------------------------------------------*/
- /* Function: AdcBurstModeTest */
- /* */
- /* Parameters: */
- /* None. */
- /* */
- /* Returns: */
- /* None. */
- /* */
- /* Description: */
- /* ADC burst mode test. */
- /*---------------------------------------------------------------------------------------------------------*/
- void AdcBurstModeTest()
- {
- uint8_t u8Option;
- uint32_t u32Count;
- printf("\n\nConversion rate: %d samples/second\n", ADC_GetConversionRate());
- printf("\n");
- printf("+----------------------------------------------------------------------+\n");
- printf("| ADC burst mode sample code |\n");
- printf("+----------------------------------------------------------------------+\n");
- printf("\nIn this test, software will get %d conversion results from the specified channel.\n", BURST_COUNT);
- while(1)
- {
- printf("\nSelect 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')
- {
- printf("%d conversion results of channel 2:\n", BURST_COUNT);
- /* Set the ADC operation mode as burst, input mode as single-end and enable the analog input channel 2 */
- ADC_Open(ADC, ADC_ADCR_DIFFEN_SINGLE_END, ADC_ADCR_ADMD_BURST, 0x1 << 2);
- /* Power on ADC module */
- ADC_POWER_ON(ADC);
- /* clear the A/D interrupt flag for safe */
- ADC_CLR_INT_FLAG(ADC, ADC_ADF_INT);
- /* Enable the ADC interrupt */
- ADC_EnableInt(ADC, ADC_ADF_INT);
- NVIC_EnableIRQ(ADC_IRQn);
- /* Reset the ADC data counter and start A/D conversion */
- g_u32AdcDataCount = 0;
- ADC_START_CONV(ADC);
- while(g_u32AdcDataCount < BURST_COUNT);
- /* Stop A/D conversion */
- ADC_STOP_CONV(ADC);
- /* Disable the ADC interrupt */
- ADC_DisableInt(ADC, ADC_ADF_INT);
- }
- else if(u8Option == '2')
- {
- printf("%d conversion results of differential input channel pair 1:\n", BURST_COUNT);
- /* Set the ADC operation mode as burst, input mode as differential and
- enable analog input channel 2 for differential input channel pair 1*/
- ADC_Open(ADC, ADC_ADCR_DIFFEN_DIFFERENTIAL, ADC_ADCR_ADMD_BURST, 1 << 2);
- /* Power on ADC module */
- ADC_POWER_ON(ADC);
- /* clear the A/D interrupt flag for safe */
- ADC_CLR_INT_FLAG(ADC, ADC_ADF_INT);
- /* Enable the ADC interrupt */
- ADC_EnableInt(ADC, ADC_ADF_INT);
- NVIC_EnableIRQ(ADC_IRQn);
- /* Reset the ADC data counter and start A/D conversion */
- g_u32AdcDataCount = 0;
- ADC_START_CONV(ADC);
- while(g_u32AdcDataCount < BURST_COUNT);
- /* Stop A/D conversion */
- ADC_STOP_CONV(ADC);
- /* Disable the ADC interrupt */
- ADC_DisableInt(ADC, ADC_ADF_INT);
- }
- else
- return ;
- for(u32Count = 0; u32Count < BURST_COUNT; u32Count++)
- {
- printf("Conversion result: 0x%X\n", g_au16AdcData[u32Count]);
- }
- /* Change operation mode to clear burst mode FIFO buffers */
- ADC_Open(ADC, ADC_ADCR_DIFFEN_DIFFERENTIAL, ADC_ADCR_ADMD_SINGLE, 2);
- }
- }
- /*---------------------------------------------------------------------------------------------------------*/
- /* ADC interrupt handler */
- /*---------------------------------------------------------------------------------------------------------*/
- void ADC_IRQHandler(void)
- {
- while(ADC_IS_DATA_VALID(ADC, 0)) /* Check the VALID bits */
- {
- if(g_u32AdcDataCount >= BURST_COUNT)
- return;
- /* In burst mode, the software always gets the conversion result of the specified channel from channel 0 */
- g_au16AdcData[g_u32AdcDataCount++] = (uint16_t)ADC_GET_CONVERSION_DATA(ADC, 0);
- }
- ADC_CLR_INT_FLAG(ADC, ADC_ADF_INT); /* clear the A/D conversion flag */
- }
- /*---------------------------------------------------------------------------------------------------------*/
- /* MAIN function */
- /*---------------------------------------------------------------------------------------------------------*/
- main(void)
- {
- /* Unlock protected registers */
- SYS_UnlockReg();
- /* Init System, IP clock and multi-function I/O */
- SYS_Init();
- /* Lock protected registers */
- SYS_LockReg();
- /* Init UART0 for printf */
- UART0_Init();
- /*---------------------------------------------------------------------------------------------------------*/
- /* SAMPLE CODE */
- /*---------------------------------------------------------------------------------------------------------*/
- printf("\nSystem clock rate: %d Hz", SystemCoreClock);
- /* Burst Mode test */
- AdcBurstModeTest();
- /* Disable ADC module */
- ADC_Close(ADC);
- /* Disable ADC IP clock */
- CLK_DisableModuleClock(ADC_MODULE);
- /* Disable External Interrupt */
- NVIC_DisableIRQ(ADC_IRQn);
- printf("\nExit ADC sample code\n");
- while(1);
- }