/**************************************************************************//**
* [url=home.php?mod=space&uid=288409]@file[/url] main.c
* [url=home.php?mod=space&uid=895143]@version[/url] V3.00
* $Revision: 5 $
* $Date: 15/07/02 11:18a $
* [url=home.php?mod=space&uid=247401]@brief[/url] Demonstrate how to use timer2 capture event to capture timer2 counter value.
* @note
* Copyright (C) 2014~2015 Nuvoton Technology Corp. All rights reserved.
******************************************************************************/
#include <stdio.h>
#include "NUC123.h"
#define HCLK_CLOCK 72000000
/*---------------------------------------------------------------------------------------------------------*/
/* Global Interface Variables Declarations */
/*---------------------------------------------------------------------------------------------------------*/
volatile uint32_t g_au32TMRINTCount[4] = {0};
/**
* @brief Timer0 IRQ
*
* @param None
*
* [url=home.php?mod=space&uid=266161]@return[/url] None
*
* [url=home.php?mod=space&uid=1543424]@Details[/url] The Timer0 default IRQ, declared in startup_NUC123.s.
*/
void TMR0_IRQHandler(void)
{
/* Clear Timer0 time-out interrupt flag */
TIMER_ClearIntFlag(TIMER0);
g_au32TMRINTCount[0]++;
}
/**
* @brief Timer1 IRQ
*
* @param None
*
* @return None
*
* @details The Timer1 default IRQ, declared in startup_NUC123.s.
*/
void TMR1_IRQHandler(void)
{
/* Clear Timer1 time-out interrupt flag */
TIMER_GetIntFlag(TIMER1);
g_au32TMRINTCount[1]++;
}
/**
* @brief Timer2 IRQ
*
* @param None
*
* @return None
*
* @details The Timer2 default IRQ, declared in startup_NUC123.s.
*/
void TMR2_IRQHandler(void)
{
if(TIMER_GetCaptureIntFlag(TIMER2) == 1)
{
/* Clear Timer2 capture interrupt flag */
TIMER_ClearCaptureIntFlag(TIMER2);
g_au32TMRINTCount[2]++;
}
}
void SYS_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Enable IRC22M clock */
CLK_EnableXtalRC(CLK_PWRCON_OSC22M_EN_Msk);
/* Waiting for IRC22M clock ready */
CLK_WaitClockReady(CLK_CLKSTATUS_OSC22M_STB_Msk);
/* Switch HCLK clock source to HIRC */
CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HIRC, CLK_CLKDIV_HCLK(1));
/* Enable XT1_OUT(PF.0) and XT1_IN(PF.1) */
SYS->GPF_MFP |= SYS_GPF_MFP_PF0_XT1_OUT | SYS_GPF_MFP_PF1_XT1_IN;
/* Enable external 12 MHz XTAL */
CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk);
/* Waiting for clock ready */
while(!CLK_WaitClockReady(CLK_CLKSTATUS_XTL12M_STB_Msk));
/* Set core clock as HCLK_CLOCK */
CLK_SetCoreClock(HCLK_CLOCK);
/* Enable peripheral clock */
CLK_EnableModuleClock(UART0_MODULE);
CLK_EnableModuleClock(TMR0_MODULE);
CLK_EnableModuleClock(TMR1_MODULE);
CLK_EnableModuleClock(TMR2_MODULE);
/* Peripheral clock source */
CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_PLL, CLK_CLKDIV_UART(1));
CLK_SetModuleClock(TMR0_MODULE, CLK_CLKSEL1_TMR0_S_HXT, 0);
CLK_SetModuleClock(TMR1_MODULE, CLK_CLKSEL1_TMR1_S_HXT, 0);
CLK_SetModuleClock(TMR2_MODULE, CLK_CLKSEL1_TMR2_S_HCLK, 0);
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set PB multi-function pins for UART0 RXD, TXD, TM0, TM1, TM2 and TM2_EXT */
SYS->GPB_MFP = SYS_GPB_MFP_PB0_UART0_RXD | SYS_GPB_MFP_PB1_UART0_TXD |
SYS_GPB_MFP_PB8_TM0 | SYS_GPB_MFP_PB9_TM1 | SYS_GPB_MFP_PB10_TM2 |
SYS_GPB_MFP_PB2_TM2_EXT;
SYS->ALT_MFP = SYS_ALT_MFP_PB2_TM2_EXT;
}
void UART0_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init UART */
/*---------------------------------------------------------------------------------------------------------*/
/* Reset IP */
SYS_ResetModule(UART0_RST);
/* Configure UART0 and set UART0 Baudrate */
UART_Open(UART0, 115200);
}
/*---------------------------------------------------------------------------------------------------------*/
/* MAIN function */
/*---------------------------------------------------------------------------------------------------------*/
int main(void)
{
volatile uint32_t u32InitCount, u32TimeoutCount;
uint32_t au32CAPValus[10];;
/* Unlock protected registers */
SYS_UnlockReg();
/* Init System, peripheral clock and multi-function I/O */
SYS_Init();
/* Lock protected registers */
SYS_LockReg();
/* Init UART0 for printf */
UART0_Init();
printf("\n\nCPU [url=home.php?mod=space&uid=72445]@[/url] %d Hz\n", SystemCoreClock);
printf("+---------------------------------------------------+\n");
printf("| Timer External Capture Function Sample Code |\n");
printf("+---------------------------------------------------+\n\n");
printf("# Timer Settings:\n");
printf(" Timer0: Clock source is 12 MHz; Toggle-output mode and frequency is 500 Hz.\n");
printf(" Timer1: Clock source is 12 MHz; Toggle-output mode and frequency is 1 Hz.\n");
printf(" Timer2: Clock source is HCLK(72 MHz); Continuous counting mode; TCMP is 0xFFFFFF;\n");
printf(" Counter pin enable; Capture pin and capture interrupt enable;\n");
printf("# Generate 500 Hz frequency from TM0(PB.8) and connect TM0 pin to Timer2 counter pin(PB.10).\n");
printf("# Generate 1 Hz frequency from TM1(PB.9) and connect TM1 pin to TM2_EXT(PB.2) capture pin.\n");
printf("# Get 500 event counts from Timer2 counter pin when each TM2_EXT pin interrupt occurred.\n\n");
/* Initial Timer0 and Timer1 default setting */
TIMER_Open(TIMER0, TIMER_TOGGLE_MODE, 1000);
TIMER_Open(TIMER1, TIMER_TOGGLE_MODE, 2);
/* Initial Timer2 default setting */
TIMER_Open(TIMER2, TIMER_CONTINUOUS_MODE, 1);
/* Configure Timer2 setting for external counter input and capture function */
TIMER_SET_PRESCALE_VALUE(TIMER2, 0);
TIMER_SET_CMP_VALUE(TIMER2, 0xFFFFFF);
TIMER_EnableEventCounter(TIMER2, TIMER_COUNTER_FALLING_EDGE);
TIMER_EnableCapture(TIMER2, TIMER_CAPTURE_FREE_COUNTING_MODE, TIMER_CAPTURE_FALLING_EDGE);
TIMER_EnableCaptureInt(TIMER2);
/* Enable Timer2 NVIC */
NVIC_EnableIRQ(TMR2_IRQn);
/* Clear Timer2 interrupt counts to 0 */
u32InitCount = g_au32TMRINTCount[2] = 0;
/* Start Timer0, Timer1 and Timer2 counting */
TIMER_Start(TIMER0);
TIMER_Start(TIMER1);
TIMER_Start(TIMER2);
/* Check TM2_EXT interrupt counts */
u32TimeoutCount = 0;
while(g_au32TMRINTCount[2] <= 10)
{
if(g_au32TMRINTCount[2] != u32InitCount)
{
u32TimeoutCount = 0;
au32CAPValus[u32InitCount] = TIMER_GetCaptureData(TIMER2);
printf("[%2d] - %4d\n", g_au32TMRINTCount[2], au32CAPValus[u32InitCount]);
if(u32InitCount > 1)
{
if((au32CAPValus[u32InitCount] - au32CAPValus[u32InitCount - 1]) != 500)
{
printf("*** FAIL ***\n");
while(1);
}
}
u32InitCount = g_au32TMRINTCount[2];
}
if(u32TimeoutCount++ > SystemCoreClock / 2)
{
printf("Timer2 capture event time-out.\n");
while(1);
}
}
/* Stop Timer0, Timer1 and Timer2 counting */
TIMER_Close(TIMER0);
TIMER_Close(TIMER1);
TIMER_Close(TIMER2);
printf("*** PASS ***\n");
while(1);
}
/*** (C) COPYRIGHT 2014~2015 Nuvoton Technology Corp. ***/
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