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Change softserial timer calculation code to support baud rates in the

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range 600 to 19200 (tested)
This commit is contained in:
Dominic Clifton 2014-04-03 12:40:17 +01:00
parent 06554338d1
commit c36d884899
4 changed files with 32 additions and 11 deletions
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11
src/drv_timer.c
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@ -145,19 +145,24 @@ void timerNVICConfig(uint8_t irq)
NVIC_Init(&NVIC_InitStructure);
}
void configTimeBase(TIM_TypeDef *tim, uint32_t period, uint8_t mhz)
void configTimeBase(TIM_TypeDef *tim, uint16_t period, uint8_t mhz)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = period - 1;
TIM_TimeBaseStructure.TIM_Period = period - 1; // AKA TIMx_ARR
// "The counter clock frequency (CK_CNT) is equal to f CK_PSC / (PSC[15:0] + 1)." - STM32F10x Reference Manual 14.4.11
// Thus for 1Mhz: 72000000 / 1000000 = 72, 72 - 1 = 71 = TIM_Prescaler
TIM_TimeBaseStructure.TIM_Prescaler = (SystemCoreClock / ((uint32_t)mhz * 1000000)) - 1;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(tim, &TIM_TimeBaseStructure);
}
void timerInConfig(const timerHardware_t *timerHardwarePtr, uint32_t period, uint8_t mhz)
void timerInConfig(const timerHardware_t *timerHardwarePtr, uint16_t period, uint8_t mhz)
{
configTimeBase(timerHardwarePtr->tim, period, mhz);
TIM_Cmd(timerHardwarePtr->tim, ENABLE);