TI中文支持网CC2640R2F PWM 设置占空比为0时, PWM管脚还有输出, PWM管脚能输出低电平吗?
程序配置如下
#define PWMOUT1_DUTY 0
#define PWM_DUTY 1000
#define PWM_FREQUENCE 100000ul
#define PWM_TIM_LOAD_VAL (uint32_t)(48000000ul / PWM_FREQUENCE)
#define PWM_METCH_VAL(X) (uint32_t)(PWM_TIM_LOAD_VAL * X / PWM_DUTY)
void PWM_Init(void)
{
pinHandle = PIN_open(&pinState, PWMPinTable);
Power_setDependency(PowerCC26XX_XOSC_HF);
Power_setDependency(PowerCC26XX_PERIPH_GPT0);
PINCC26XX_setMux(pinHandle, PWMOUT1_PIN, IOC_PORT_MCU_PORT_EVENT0);
TimerConfigure(GPT0_BASE, TIMER_CFG_SPLIT_PAIR | TIMER_CFG_A_PWM );
HWREG(GPT0_BASE + GPT_O_CTL) &= ~(GPT_CTL_TAEN);
TimerLevelControl(GPT0_BASE, TIMER_A, TRUE);
HWREG(GPT0_BASE + GPT_O_TAILR) = PWM_TIM_LOAD_VAL;
HWREG(GPT0_BASE + GPT_O_TAMATCHR) = PWM_METCH_VAL(PWMOUT1_DUTY);
PWM_SetDuty( PWMOUT1_DUTY);
HWREG(GPT0_BASE + GPT_O_CTL) |= (GPT_CTL_TAEN);
}
void PWM_SetDuty(,uint16 duty)
{
if(duty == 0)
{
HWREG(GPT0_BASE + GPT_O_TAMATCHR) = (uint32)0;
}
else if(duty == PWM_DUTY)
{
HWREG(GPT0_BASE + GPT_O_TAMATCHR) = (uint32)PWM_TIM_LOAD_VAL-1;
}
else
{
HWREG(GPT0_BASE + GPT_O_TAMATCHR) = PWM_METCH_VAL(duty);
}
}
Alvin Chen：
请使用TI提供driver 接口：
C:\ti\simplelink_cc2640r2_sdk_3_10_00_15\examples\rtos\CC2640R2_LAUNCHXL\drivers\pwmled2
