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Merge pull request #3233 from brimston3/fix_k20_pwmclk 

K20xx Calculate PWM clock relative to bus clock
pull/3241/head
Sam Grove 2016-11-14 21:44:51 -06:00 committed by GitHub
parent c131a27dcf 8482aafa2a
commit 31c81131df
1 changed files with 4 additions and 1 deletions
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5
targets/TARGET_Freescale/TARGET_K20XX/pwmout_api.c
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@ -27,8 +27,11 @@ void pwmout_init(pwmout_t* obj, PinName pin) {
PWMName pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM); PWMName pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
MBED_ASSERT(pwm != (PWMName)NC); 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; uint32_t clkdiv = 0;
float clkval = SystemCoreClock / 1000000.0f; float clkval = BusClock / 1000000.0f;
while (clkval > 1) { while (clkval > 1) {
clkdiv++; clkdiv++;