#include <stdio.h>
#include "Mini51Series.h"
volatile uint32_t t,t1,code=0;
void TMR0_IRQHandler(void)
{
if(TIMER_GetCaptureIntFlag(TIMER0)==1)
{
t = TIMER_GetCaptureData(TIMER0);
TIMER_ClearCaptureIntFlag(TIMER0);
}
}
void SYS_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Unlock protected registers */
SYS_UnlockReg();
/* Set P5 multi-function pins for XTAL1 and XTAL2 */
// SYS->P5_MFP |= (SYS_MFP_P50_XTAL1 | SYS_MFP_P51_XTAL2);
/* Enable external 12MHz XTAL (UART), and HIRC */
CLK->PWRCON |= /*CLK_PWRCON_XTL12M |*/ CLK_PWRCON_IRC22M_EN_Msk;
/* Waiting for clock ready */
CLK_WaitClockReady(/*CLK_CLKSTATUS_XTL_STB_Msk |*/CLK_CLKSTATUS_IRC22M_STB_Msk);
/* Enable UART and Timer 0 clock */
CLK->APBCLK = CLK_APBCLK_UART_EN_Msk | CLK_APBCLK_TMR0_EN_Msk;
/* Select UART clock source from external crystal*/
CLK->CLKSEL1 = (CLK->CLKSEL1 & ~CLK_CLKSEL1_UART_S_Msk) | CLK_CLKSEL1_UART_S_XTAL;
/* Update System Core Clock */
/* User can use SystemCoreClockUpdate() to calculate SystemCoreClock and CycylesPerUs automatically. */
SystemCoreClockUpdate();
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set P0 multi-function pins for UART RXD, TXD */
SYS->P0_MFP = SYS_MFP_P13_TXD | SYS_MFP_P12_RXD;
/* Set P3 multi function pin for Timer 0 capture pin */
SYS->P3_MFP = SYS_MFP_P32_T0EX;
/* Lock protected registers */
SYS_LockReg();
}
int main(void)
{
//int volatile i;
/* Init System, IP clock and multi-function I/O
In the end of SYS_Init() will issue SYS_LockReg()
to lock protected register. If user want to write
protected register, please issue SYS_UnlockReg()
to unlock protected register if necessary */
SYS_Init();
/* Init UART to 115200-8n1 for print message */
UART_Open(UART0, 115200);
printf("\nThis sample code demonstrate timer trigger counting mode.\n");
printf("Please connect input source with Timer 0 capture pin T0EX (P3.2), press any key to continue\n");
getchar();
// Give a dummy target frequency here. Will over write capture resolution with macro
TIMER_Open(TIMER0, TIMER_PERIODIC_MODE, 1);
// Update prescale to set proper resolution.
TIMER_SET_PRESCALE_VALUE(TIMER0, 0);
// Set compare value as large as possible, so don't need to worry about counter overrun too frequently.
TIMER_SET_CMP_VALUE(TIMER0, 0x7FFF);
// Configure Timer 0 free counting mode, capture TDR value on rising edge
// TIMER_EnableCapture(TIMER0, TIMER_CAPTURE_TRIGGER_COUNTING_MODE, TIMER_CAPTURE_RISING_EDGE);
TIMER_EnableCapture(TIMER0, TIMER_CAPTURE_TRIGGER_COUNTING_MODE, TIMER_CAPTURE_RISING_THEN_FALLING_EDGE);
// Start Timer 0
TIMER_Start(TIMER0);
// Enable timer interrupt
TIMER_EnableCaptureInt(TIMER0);
NVIC_EnableIRQ(TMR0_IRQn);
while(1);
}
用的官方的库，测量高电平脉宽，但测量的数据不对，请大神帮忙看下，指教指教！ |
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