Posted on October 18, 2014 at 14:03Hi
I'm trying to use TCS3200 color sensor interface with stm32f4
I used input capture of timer 2, channel 3 and Interrupt to calculator pulse from OUT sensor
Of course, i don't know algorithm good. Because the sensor have 4 mode: blue, red, green and clear. One mode, we have a pulse another.
i wrote as follow
void Color_filter(void)
{
/* Reset Sensor value */
RedMode = 1;
GreenMode = 0;
BlueMode = 0;
TimeRed_H = 0;
TimeRed_L = 0;
TimeGreen_H=0;
TimeGreen_L=0;
TimeBlue_H=0;
TimeBlue_L=0;
/* Enable the CC3 Interrupt Request */
TIM_ITConfig(TIM2, TIM_IT_CC3, ENABLE);
/* PB3--> S2, PB4--> S3*/
/* RED Filter */
GPIO_ResetBits(GPIOB,GPIO_Pin_3);
GPIO_ResetBits(GPIOB,GPIO_Pin_4);
Delay(1000);
while(RedMode == 1);
/* GREEN Filter */
GPIO_SetBits(GPIOB,GPIO_Pin_3);
GPIO_SetBits(GPIOB,GPIO_Pin_4);
GreenMode = 1;
Delay(1000);
while(GreenMode == 1);
/* BLUE Filter */
GPIO_ResetBits(GPIOB,GPIO_Pin_3);
GPIO_SetBits(GPIOB,GPIO_Pin_4);
BlueMode = 1;
Delay(1000);
while(BlueMode == 1);
/* Clear */
GPIO_SetBits(GPIOB,GPIO_Pin_3);
GPIO_ResetBits(GPIOB,GPIO_Pin_4);
/* Disable the CC3 Interrupt Request */
TIM_ITConfig(TIM2, TIM_IT_CC3, DISABLE);
/* Timimg Calculation avoid for overflow */
if(TimeRed_H > TimeRed_L)
TimeRed = (uint32_t)(TimeRed_H - TimeRed_L);
else if(TimeRed_H < TimeRed_L)
TimeRed = (uint32_t)((0xFFFF - TimeRed_L) + TimeRed_H);
if(TimeGreen_H > TimeGreen_L)
TimeGreen = (uint32_t)(TimeGreen_H - TimeGreen_L);
else if(TimeGreen_H < TimeGreen_L)
TimeGreen = (uint32_t)((0xFFFF - TimeGreen_L) + TimeGreen_H);
if(TimeBlue_H > TimeBlue_L)
TimeBlue = (uint32_t)(TimeBlue_H - TimeBlue_L);
else if(TimeBlue_H < TimeBlue_L)
TimeBlue = (uint32_t)((0xFFFF - TimeBlue_L) + TimeBlue_H);
/* Frequency Calculation */
FreqRed = SystemCoreClock/TimeRed;
FreqGreen = SystemCoreClock/TimeGreen;
FreqBlue = SystemCoreClock/TimeBlue;
}
void Delay(__IO uint32_t nCount)
{
while(nCount--)
{
}
}
void TIM2_IRQHandler(void)
{
if(TIM_GetITStatus(TIM2,TIM_IT_CC3) == SET)
{
if((RedMode == 1) && (Number == 0))
{
TimeRed_L = TIM_GetCapture3(TIM2);
Number = 1;
}
else if((RedMode == 1) && (Number == 1))
{
TimeRed_H = TIM_GetCapture3(TIM2);
RedMode = 0;
Number = 0;
}
else if((GreenMode == 1) && (Number == 0))
{
TimeGreen_L = TIM_GetCapture3(TIM2);
Number = 1;
}
else if((GreenMode == 1) && (Number == 1))
{
TimeGreen_H = TIM_GetCapture3(TIM2);
GreenMode = 0;
Number = 0;
}
if((BlueMode == 1) && (Number == 0))
{
TimeBlue_L = TIM_GetCapture3(TIM2);
Number = 1;
}
else if((BlueMode == 1) && (Number == 1))
{
TimeBlue_H = TIM_GetCapture3(TIM2);
BlueMode = 0;
Number = 0;
}
TIM_ClearITPendingBit(TIM2,TIM_IT_CC3);
}
}
it gets stuck when coming out of interrupt in the first. i really hope you can give me one solution.
