MSPM0G3507——定时器例程讲解4——timx_timer_mode

MSPM0G3507——定时器例程讲解4——timx_timer_mode_periodic

以下示例以周期模式配置TimerG并切换LED。周期从500ms开始，每次切换减少50ms，直到周期为100ms，然后重复。设备在等待中断时保持待机模式


#include "ti_msp_dl_config.h"/* ((32KHz / (32+1)) * 0.5s) = 45 - 1 = 495 due to N+1 ticks */
#define TIMER_500_MILLISECONDS_TICKS (495)                                  //算出定时0.5秒所需要的定时器循环次数
/* ((32KHz / (32+1)) * 0.05s) = 50 */
#define TIMER_50_MILLISECONDS_TICKS (50)                                    //算出定时0.5秒所需要的循环次数int main(void)
{SYSCFG_DL_init();NVIC_EnableIRQ(TIMER_0_INST_INT_IRQN);DL_SYSCTL_enableSleepOnExit();DL_TimerG_startCounter(TIMER_0_INST);while (1) {__WFI();}
}void TIMER_0_INST_IRQHandler(void)
{static uint32_t count = TIMER_500_MILLISECONDS_TICKS;switch (DL_TimerG_getPendingInterrupt(TIMER_0_INST)) {case DL_TIMER_IIDX_ZERO:/** Counter stopped to avoid a conflict with the timer reading* the LOAD value while it's being set*/DL_TimerG_stopCounter(TIMER_0_INST);/** Count progressively gets smaller in 0.05 s increments until* reset with 0.5s*/if (count > (TIMER_500_MILLISECONDS_TICKS / 5)) {count = count - TIMER_50_MILLISECONDS_TICKS;} else {count = TIMER_500_MILLISECONDS_TICKS;}DL_Timer_setLoadValue(TIMER_0_INST, count);                             //设置定时周期/** By default, this should load the new count value and count down* from there (CVAE = 0)*/DL_TimerG_startCounter(TIMER_0_INST);DL_GPIO_togglePins(GPIO_LEDS_PORT,(GPIO_LEDS_USER_LED_1_PIN | GPIO_LEDS_USER_TEST_PIN));break;default:break;}
}

用到一个DL_Timer_setLoadValue(TIMER_0_INST, count);

用来设置定时器定时周期

用法如下