MO58SSAN PWM 频率改变

只看该作者 · 2016-5-12 13:05

想用M058SSAN 产生100khz左右的pwm 但是例程里的函数始终改不上去
uint32_t PWM_ConfigOutputChannel(PWM_T *pwm,
                              uint32_t u32ChannelNum,
                              uint32_t u32Frequency,
                              uint32_t u32DutyCycle)
{
uint32_t u32Src;
uint32_t u32PWMClockSrc;
uint32_t u32PWMClkTbl[4] = {__HXT, __LIRC, 0, __HIRC};
uint32_t i;
uint8_t  u8Divider =16, u8Prescale = 0xFF;
/* this table is mapping divider value to register configuration */
uint32_t u32PWMDividerToRegTbl[17] = {NULL, 4, 0, NULL, 1, NULL, NULL, NULL, 2, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 3};
uint16_t u16CNR = 0xFFFF;

u32Src = (CLK->CLKSEL1 & (CLK_CLKSEL1_PWM01_S_Msk << (u32ChannelNum & 2))) >> (CLK_CLKSEL1_PWM01_S_Pos + (u32ChannelNum & 2));