参考官方BSP里的Timer Capture这个例程，调试NUC029TAN定时器1的捕获功能，捕获输入信号用单片机自己产生的40KHz PWM，调了三四天了，一直不进捕获中断，捕获寄存器的值一直是0.
测试硬件IO T1(P3.5口)是好的，可以输出高低电平，就是不能捕获，急求大神解答啊。。。
附上调试代码：
1、时钟配置
void SysClockInit(void)
{
/* Unlock protected registers */
SYS_UnlockReg();
/* 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 peripheral clock */
CLK->APBCLK = CLK_APBCLK_UART1_EN_Msk |
CLK_APBCLK_TMR0_EN_Msk | CLK_APBCLK_TMR1_EN_Msk | CLK_APBCLK_TMR2_EN_Msk | CLK_APBCLK_TMR3_EN_Msk;
/* Peripheral clock source */
CLK->CLKSEL1 = CLK_CLKSEL1_UART_S_PLL |
CLK_CLKSEL1_TMR0_S_HXT | CLK_CLKSEL1_TMR1_S_HCLK | CLK_CLKSEL1_TMR1_S_HIRC | CLK_CLKSEL1_TMR3_S_HXT;
/* Lock protected registers */
SYS_LockReg();
}
2、GPIO配置
void GPIO_Init(void)
{
SYS->P0_MFP =SYS_MFP_P01_RXD1 | SYS_MFP_P00_TXD1;
/* Set P2 multi-function pins for PWMA Channel2 */
SYS->P2_MFP = SYS_MFP_P22_PWM2 | SYS_MFP_P23_PWM3 | SYS_MFP_P24_PWM4;
//GPIO_SetMode(P3, BIT2, GPIO_PMD_INPUT);
//GPIO_SetMode(P0, BIT0, GPIO_PMD_OPEN_DRAIN);
//P00 = 1;
//ACMP0 ACMP1
SYS->P1_MFP = SYS_MFP_P15_ACMP0_P;
//SYS->P2_MFP = SYS_MFP_P26_ACMP1_O;
SYS->P3_MFP = SYS_MFP_P31_ACMP1_P | SYS_MFP_P34_T0 | SYS_MFP_P35_T1;
/* Disable digital input path of analog pin ACMP0_P to prevent leakage */
GPIO_DISABLE_DIGITAL_PATH(P1, (1 << 5) << GPIO_OFFD_OFFD_Pos);
/* Disable digital input path of analog pin ACMP0_P to prevent leakage */
GPIO_DISABLE_DIGITAL_PATH(P3, (1 << 1) << GPIO_OFFD_OFFD_Pos);
//KEY
/* Configure P3.2 as Quasi-bidirection mode and enable interrupt by falling edge trigger */
GPIO_SetMode(P3, BIT2, GPIO_PMD_QUASI);
GPIO_EnableInt(P3, 2, GPIO_INT_FALLING);
NVIC_EnableIRQ(EINT0_IRQn);
}
3、定时器相关配置（主函数）
/*---------------------------------------------------------------------------------------------------------*/
/* MAIN function */
/*---------------------------------------------------------------------------------------------------------*/
int main(void)
{
volatile uint32_t u32InitCount;
SysClockInit();
GPIO_Init();
UART1_Init(115200); //NUC029 UART1
//PWMA2_Init();
//PWMA3_Init();
PWM_DeadZone_Init();
//PWMB_Init();
AMCP01_Init();
printf("\n\nCPU @ %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(" Timer3: Clock source is 12 MHz; Toggle-output mode and frequency is 1 Hz.\n");
printf(" Timer1: Clock source is HCLK(50 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 T0 and connect T0 pin to Timer1 counter pin.\n");
printf("# Generate 1 Hz frequency from T3 and connect T3 pin to T1EX capture pin.\n");
printf("# Get 500 event counts from Timer1 counter pin when each T1EX pin interrupt occurred.\n\n");
/* Initial Timer0 and Timer3 default setting */
TIMER_Open(TIMER0, TIMER_TOGGLE_MODE, 1000);
TIMER_Open(TIMER3, TIMER_TOGGLE_MODE, 2);
/* Initial Timer1 default setting */
TIMER_Open(TIMER1, TIMER_CONTINUOUS_MODE, 1);
/* Configure Timer1 setting for external counter input and capture function */
TIMER_SET_PRESCALE_VALUE(TIMER1, 0);
TIMER_SET_CMP_VALUE(TIMER1, 0xFFFFFF);
TIMER_EnableEventCounter(TIMER1, TIMER_COUNTER_FALLING_EDGE);
TIMER_EnableCapture(TIMER1, TIMER_CAPTURE_FREE_COUNTING_MODE, TIMER_CAPTURE_FALLING_EDGE);
TIMER_EnableCaptureInt(TIMER1);
/* Enable Timer1 NVIC */
NVIC_EnableIRQ(TMR1_IRQn);
/* Clear Timer1 interrupt counts to 0 */
u32InitCount = g_au32TMRINTCount[1] = 0;
/* Start Timer0, Timer1 and Timer3 counting */
TIMER_Start(TIMER0);
TIMER_Start(TIMER1);
TIMER_Start(TIMER3);
/* Check T1EX interrupt counts */
while(g_au32TMRINTCount[1] <= 10)
{
if(g_au32TMRINTCount[1] != u32InitCount)
{
printf("[%2d] - %4d\n", g_au32TMRINTCount[1], TIMER_GetCaptureData(TIMER1));
u32InitCount = g_au32TMRINTCount[1];
}
}
/* Stop Timer0, Timer1 and Timer3 counting */
TIMER_Close(TIMER0);
TIMER_Close(TIMER1);
TIMER_Close(TIMER3);
printf("*** PASS ***\n");
while(1);
}
4、定时器中断函数
/**
* @brief Timer0 IRQ
*
* @param None
*
* @return None
*
* @Details The Timer0 default IRQ, declared in startup_NUC029xAN.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_NUC029xAN.s.
*/
void TMR1_IRQHandler(void)
{
if(TIMER_GetCaptureIntFlag(TIMER1) == 1)
{
/* Clear Timer1 capture interrupt flag */
TIMER_ClearCaptureIntFlag(TIMER1);
g_au32TMRINTCount[1]++;
}
}
/**
* @brief Timer2 IRQ
*
* @param None
*
* @return None
*
* @details The Timer2 default IRQ, declared in startup_NUC029xAN.s.
*/
void TMR2_IRQHandler(void)
{
/* Clear Timer2 time-out interrupt flag */
TIMER_GetIntFlag(TIMER2);
g_au32TMRINTCount[2]++;
}
/**
* @brief Timer3 IRQ
*
* @param None
*
* @return None
*
* @details The Timer3 default IRQ, declared in startup_NUC029xAN.s.
*/
void TMR3_IRQHandler(void)
{
/* Clear Timer3 time-out interrupt flag */
TIMER_GetIntFlag(TIMER3);
g_au32TMRINTCount[3]++;
}
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