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K20xx Calculate PWM clock relative to bus clock #3233

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Merged
merged 1 commit into from
Nov 15, 2016
Merged

K20xx Calculate PWM clock relative to bus clock #3233

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5 changes: 4 additions & 1 deletion targets/TARGET_Freescale/TARGET_K20XX/pwmout_api.c
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Original file line number Diff line number Diff line change
Expand Up @@ -27,8 +27,11 @@ void pwmout_init(pwmout_t* obj, PinName pin) {
PWMName pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
MBED_ASSERT(pwm != (PWMName)NC);

uint32_t MGCOUTClock = SystemCoreClock * (1u + ((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV1_MASK) >> SIM_CLKDIV1_OUTDIV1_SHIFT));
uint32_t BusClock = MGCOUTClock / (1u + ((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV2_MASK) >> SIM_CLKDIV1_OUTDIV2_SHIFT));

uint32_t clkdiv = 0;
float clkval = SystemCoreClock / 1000000.0f;
float clkval = BusClock / 1000000.0f;

while (clkval > 1) {
clkdiv++;
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