int main()
{
uint16_t PrescalerValue;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
LED_Init();
LED_R_ON();
LED_G_ON();
LLIO_Init(115200);
/* TIM2, GPIOA clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
/* Enable the TIM2 global Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0f;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
// PA0 핀을 TIM2_CH1 input으로 설정
GPIO_PinAFConfig(GPIOA, GPIO_PinSource0, GPIO_AF_TIM2);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Compute the prescaler value */
SystemCoreClockUpdate();
PrescalerValue = (uint16_t) (SystemCoreClock / 2 / TIMER_PRESCALER_FREQ) - 1; // timer base counter에 1MHz 입력
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = TIMER_PERIOD;
TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0;
TIM_ICInit(TIM2, &TIM_ICInitStructure);
/* TIM2 enable counter */
TIM_Cmd(TIM2, ENABLE);
TIM_ITConfig(TIM2, TIM_IT_Update | TIM_IT_CC1, ENABLE);
printf("\r\nTimer Capture example\r\n");
while(1)
{
__WFI();
if (capture_flag)
{
capture_flag = 0;
printf("time diff = %d[us]\r\n", diff);
LED_G_TOGGLE();
}
}
}
/***************************************************
* Function: void timer0_isr(void)
*
* OverView: If low interrupt actived, called this function.
* Control LED
*
* Note: reference BootLoader.h
***************************************************/
void timer0_isr(void)
{
if(INTCONbits.TMR0IF)
{
INTCONbits.TMR0IF = 0;
TMR0L = tmr0l_temp;
if(!wg_ledCtrl)
{
if(wg_ledPwmDuty <= 0)
{
TMR0L = wg_ledPwmDuty;
LED_WG_OFF();
}
else if(TMR0L == wg_ledPwmDuty)
{
TMR0L = 255 - wg_ledPwmDuty;
LED_WG_ON();
}
else
{
TMR0L = wg_ledPwmDuty;
LED_WG_OFF();
}
}
else if(!r_ledCtrl)
{
if(r_ledPwmDuty <= 0)
{
TMR0L = r_ledPwmDuty;
LED_R_OFF();
}
else if(TMR0L == r_ledPwmDuty)
{
TMR0L = 255 - r_ledPwmDuty;
LED_R_ON();
}
else
{
TMR0L = r_ledPwmDuty;
LED_R_OFF();
}
}
else if(!g_ledCtrl)
{
if(g_ledPwmDuty <= 0)
{
TMR0L = g_ledPwmDuty;
LED_G_OFF();
}
else if(TMR0L == g_ledPwmDuty)
{
TMR0L = 255 - g_ledPwmDuty;
LED_G_ON();
}
else
{
TMR0L = g_ledPwmDuty;
LED_G_OFF();
}
}
else if(!b_ledCtrl)
{
if(b_ledPwmDuty <= 0)
{
TMR0L = b_ledPwmDuty;
LED_B_OFF();
}
else if(TMR0L == b_ledPwmDuty)
{
TMR0L = 255 - b_ledPwmDuty;
LED_B_ON();
}
else
{
TMR0L = b_ledPwmDuty;
LED_B_OFF();
}
}
else
{
TMR0L = tmr0l_temp;
LED_WG_OFF();
LED_R_OFF();
LED_G_OFF();
LED_B_OFF();
}
tmr0l_temp = TMR0L;
}
}
