/**
* Reset 1-wire bus (~1 ms).
*/
static inline uint8_t reset(void)
{
uint8_t tmp = 0;
uint8_t result = 0;
TIM1_SetAutoreload(485);
TIM1->CR1 |= TIM1_CR1_CEN;
OW_PORT->ODR |= OW_OUT;
while (TIM1->CR1 & TIM1_CR1_CEN);
OW_PORT->ODR &= ~OW_OUT;
TIM1_ClearFlag(TIM1_FLAG_UPDATE);
// Wait once again, sample within 100 mks
TIM1->CR1 |= TIM1_CR1_CEN;
while (TIM1->CR1 & TIM1_CR1_CEN)
{
tmp = TIM1->CNTRH;
if (TIM1->CNTRL >= RESET_TIME)
break;
}
result = (OW_PORT->IDR & OW_IN) == 0;
// Wait for the end of reset period.
while (TIM1->CR1 & TIM1_CR1_CEN);
TIM1_ClearFlag(TIM1_FLAG_UPDATE);
TIM1_SetAutoreload(60);
return result;
}
/**
* @brief Configure TIM1 peripheral
* @param None
* @retval None
*/
static void TIM1_Config(void)
{
/* configure TIM1 channel 1 as PWM Output */
TIM1_OC1Init(TIM1_OCMode_PWM1, TIM1_OutputState_Enable, TIM1_OutputNState_Disable,
0x7FF/* TIM1_Pulse */, TIM1_OCPolarity_Low, TIM1_OCNPolarity_Low,
TIM1_OCIdleState_Reset, TIM1_OCNIdleState_Reset);
/* Set TIM1 Autoreload value*/
TIM1_SetAutoreload(0xFFF);
/* Enable TIM1 */
TIM1_Cmd(ENABLE);
/* GPIO configuration: TIM1 channel 1 (PD2)*/
GPIO_Init(GPIOD, GPIO_Pin_2 , GPIO_Mode_Out_PP_Low_Fast);
/* Enable TIM1 Outputs*/
TIM1_CtrlPWMOutputs(ENABLE);
}
