本帖最后由 雪孩爱雪 于 2020-11-28 16:31 编辑
继续学习基础部分。实验目的:使用CTimer来产生100ms和1s标志位,用于在主循环中使用。
一、引脚。 GPIO中 二:代码 #include "fsl_debug_console.h" #include "board.h" #include "fsl_ctimer.h" #include "pin_mux.h" #include <stdbool.h> #define CTIMER CTIMER2 /* Timer 2 */ #define CTIMER_MAT_OUT kCTIMER_Match_1 /* Match output 1 */ #define CTIMER_CLK_FREQ CLOCK_GetCTimerClkFreq(2U) void ctimer2_callback(uint32_t flags); volatile uint32_t g_pwmPeriod = 0U; volatile uint32_t g_pulsePeriod = 0U; static ctimer_callback_t ctimer_callback[] = {ctimer2_callback}; volatile uint32_t gCtimer100msCnt = 0U; volatile uint32_t gCtimer100msFlag = 0U; volatile uint32_t gCtimer1sFlag = 0U; status_t CTIMER_GetPwmPeriodValue(uint32_t pwmFreqHz, uint8_t dutyCyclePercent, uint32_t timerClock_Hz) { g_pwmPeriod = (timerClock_Hz / pwmFreqHz) - 1; if (dutyCyclePercent == 0) { g_pulsePeriod = g_pwmPeriod + 1; } else { g_pulsePeriod = (g_pwmPeriod * (100 - dutyCyclePercent)) / 100; } return kStatus_Success; } void ctimer2_callback(uint32_t flags) { gCtimer100msFlag = 1; if(gCtimer100msCnt > 9) { gCtimer1sFlag = 1; gCtimer100msCnt = 0; } else { gCtimer100msCnt++; } } int main(void) { ctimer_config_t config; uint32_t timerClock; uint8_t flag1 = 0,flag2 = 0; CLOCK_AttachClk(BOARD_DEBUG_UART_CLK_ATTACH); CLOCK_AttachClk(kFRO_HF_to_CTIMER2); BOARD_InitPins(); BOARD_BootClockPLL150M(); BOARD_InitDebugConsole(); CTIMER_GetDefaultConfig(&config); timerClock = CTIMER_CLK_FREQ / (config.prescale + 1); CTIMER_Init(CTIMER, &config); CTIMER_RegisterCallBack(CTIMER, &ctimer_callback[0], kCTIMER_SingleCallback); CTIMER_GetPwmPeriodValue(10, 50, timerClock); // 10Hz = 100ms中断一次 CTIMER_SetupPwmPeriod(CTIMER, CTIMER_MAT_OUT, g_pwmPeriod, g_pulsePeriod, true); CTIMER_StartTimer(CTIMER); while (1) { if(gCtimer100msFlag == 1) { if(flag1 == 0) { GPIO_PinWrite(BOARD_INITPINS_OUT1_GPIO,BOARD_INITPINS_OUT1_PORT,BOARD_INITPINS_OUT1_PIN,0); flag1 = 1; } else { GPIO_PinWrite(BOARD_INITPINS_OUT1_GPIO,BOARD_INITPINS_OUT1_PORT,BOARD_INITPINS_OUT1_PIN,1); flag1 = 0; } gCtimer100msFlag = 0; } else if(gCtimer1sFlag == 1) { if(flag2 == 0) { GPIO_PinWrite(BOARD_INITPINS_OUT2_GPIO,BOARD_INITPINS_OUT2_PORT,BOARD_INITPINS_OUT2_PIN,0); flag2 = 1; } else { GPIO_PinWrite(BOARD_INITPINS_OUT2_GPIO,BOARD_INITPINS_OUT2_PORT,BOARD_INITPINS_OUT2_PIN,1); flag2 = 0; } gCtimer1sFlag = 0; } } }
三、其它问题。 我在使用CTimer0、1、3、4时,发现timerClock = CTIMER_CLK_FREQ / (config.prescale + 1);的CTIMER_CLK_FREQ为0,将其改为96000000即可。
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