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Update pwmout_api.c 

Line 244 changed PclkFreq*2 to PcklFreq
Line 246 changed PclkFreq to PclkFreq*2

This is proposed as the current pwmout_api.c gives the wrong period/frequency when using e.g."mypwm.period_ms(1);"
For PWM1 1ms gave 500Hz and PWM2,3 and 4 gave 2KHz

Applied to source as above and re-compiled this gave 1KHz outputs for all PWM's selected
Tried on NUCLEO STM32F401RE will effect other NUCLEO-STM32F4 as above

HAL Clocks are as follows for the F401RE Board:  PCLK1=42000000 PCLK2=84000000 HCLK=84000000

Kind Regards

Martin
pull/1268/head
Martin Simpson 2015-07-27 12:16:45 +01:00
parent 9b9bab51e5
commit bbfd190206
1 changed files with 2 additions and 2 deletions
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4
libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F4/pwmout_api.c
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@ -241,9 +241,9 @@ void pwmout_period_us(pwmout_t* obj, int us)
TimHandle.Init.Period = us - 1;
if (APBxCLKDivider == RCC_HCLK_DIV1)
TimHandle.Init.Prescaler = (uint16_t)((PclkFreq*2) / 1000000) - 1; // 1 µs tick
TimHandle.Init.Prescaler = (uint16_t)((PclkFreq) / 1000000) - 1; // 1 µs tick
else
TimHandle.Init.Prescaler = (uint16_t)((PclkFreq) / 1000000) - 1; // 1 µs tick
TimHandle.Init.Prescaler = (uint16_t)((PclkFreq)*2 / 1000000) - 1; // 1 µs tick
TimHandle.Init.ClockDivision = 0;
TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
HAL_TIM_PWM_Init(&TimHandle);