TimerA的初始化配置代码，在main.c中初始化，具体如下：
static void Timera_Config(void)
{
stc_timera_base_init_t stcTimeraInit;
stc_timera_compare_init_t stcTimerCompareInit;
stc_irq_regi_conf_t stcIrqRegiConf;
stc_port_init_t stcPortInit;
/* configuration structure initialization */
MEM_ZERO_STRUCT(stcTimeraInit);
MEM_ZERO_STRUCT(stcIrqRegiConf);
MEM_ZERO_STRUCT(stcTimerCompareInit);
MEM_ZERO_STRUCT(stcPortInit);
/* Configuration peripheral clock */
PWC_Fcg2PeriphClockCmd(TIMERA_UNIT4_CLOCK, Enable);
PWC_Fcg0PeriphClockCmd(PWC_FCG0_PERIPH_AOS, Enable);
/* Configuration TIMERA compare pin */
PORT_SetFunc(TIMERA_UNIT4_CH2_PORT, TIMERA_UNIT4_CH2_PIN, TIMERA_UNIT4_CH2_FUNC, Disable);
/* Configuration timera unit 4 base structure */
stcTimeraInit.enClkDiv = TimeraPclkDiv128; //84M/128 = 656.25Khz
stcTimeraInit.enCntMode = TimeraCountModeTriangularWave; //TriangularWave
stcTimeraInit.enCntDir = TimeraCountDirUp;
stcTimeraInit.enSyncStartupEn = Disable;
stcTimeraInit.u16PeriodVal = PERIOD_VAL; //freq: 100Hz; cd0/hex = 3280/dec
TIMERA_BaseInit(TIMERA_UNIT4, &stcTimeraInit);
/* Configuration timera unit 4 compare structure */
stcTimerCompareInit.u16CompareVal = stcTimeraInit.u16PeriodVal * 4u / 5u; //duty cycle: (1-80%)=20%
stcTimerCompareInit.enStartCountOutput = TimeraCountStartOutputLow;
stcTimerCompareInit.enStopCountOutput = TimeraCountStopOutputLow;
stcTimerCompareInit.enCompareMatchOutput = TimeraCompareMatchOutputReverse;
stcTimerCompareInit.enPeriodMatchOutput = TimeraPeriodMatchOutputKeep;
stcTimerCompareInit.enSpecifyOutput = TimeraSpecifyOutputInvalid;
//stcTimerCompareInit.enCacheEn = Enable;
//stcTimerCompareInit.enTriangularTroughTransEn = Enable;
//stcTimerCompareInit.enTriangularCrestTransEn = Disable;
//stcTimerCompareInit.u16CompareCacheVal = stcTimerCompareInit.u16CompareVal;
/* Configure Channel 2 */
TIMERA_CompareInit(TIMERA_UNIT4, TIMERA_UNIT4_CH2, &stcTimerCompareInit);
TIMERA_CompareCmd(TIMERA_UNIT4, TIMERA_UNIT4_CH2, Enable);
/* Enable period count interrupt */
TIMERA_IrqCmd(TIMERA_UNIT4, TimeraIrqOverflow, Enable);
/* Interrupt of timera unit 4 */
stcIrqRegiConf.enIntSrc = TIMERA_UNIT4_OVERFLOW_INT;
stcIrqRegiConf.enIRQn = Int006_IRQn;
stcIrqRegiConf.pfnCallback = &TimeraUnit4_IrqCallback;
enIrqRegistration(&stcIrqRegiConf);
NVIC_ClearPendingIRQ(stcIrqRegiConf.enIRQn);
NVIC_SetPriority(stcIrqRegiConf.enIRQn, DDL_IRQ_PRIORITY_15);
NVIC_EnableIRQ(stcIrqRegiConf.enIRQn);
/* Configure timera unit 4 disable */
TIMERA_Cmd(TIMERA_UNIT4, Disable);
}
通过PUMP_ON来启动pwm波，PUMP_ON在中断函数中调用：
/* TIMERA PWM parameter definition */
#define PERIOD_VAL 0xCD0u
#define DUTY_CYLCE (0.4) //duty cycle: 0~1, except 0 and 1; duty_cycle = u16Compare/u16Period = COMPARE_VAL/PERIOD_VAL
#define COMPARE_VAL (PERIOD_VAL * (1-DUTY_CYLCE))
#define PUMP_ON() {TIMERA_Cmd(TIMERA_UNIT4, Enable);TIMERA_SetCompareValue(TIMERA_UNIT4, TIMERA_UNIT4_CH2, COMPARE_VAL);}
#define PUMP_OFF() TIMERA_Cmd(TIMERA_UNIT4, Disable)
|
楼主
