Posted on November 12, 2015 at 14:16Hi guys.
im working on a simple encoder project where id like to read the encoder lines A and B and set a counter.
although, the interruptflags on PC6 and PC7 are not beeing set and i cant see why.
PC6 and 7 were tested with a oscilloscope and the signal from the encoder channels is correct.
here some coding
int main(void)
{
/* SysTick end of count event each 1ms */
// RCC_GetClocksFreq(&RCC_ClockFreq);
// SysTick_Config(RCC_ClockFreq.HCLK_Frequency / 1000);
/* System initialization */
SysInit();
/* Endless loop */
while(1)
{
/* check if flags are being set */
temp--;
temp = EXTI_GetFlagStatus(EXTI_Line6);
temp = EXTI_GetFlagStatus(EXTI_Line7);
}
}
void EXTI_Configuration(void)
{
EXTI_InitTypeDef EXTI_InitStructure;
/* Connect EXTI6-8 Line to PC6-8 pin */
GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource6);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource7);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource8);
/* Configure EXTI6-8 line */
EXTI_InitStructure.EXTI_Line = EXTI_Line6 | EXTI_Line7 | EXTI_Line8;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
}
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Encoder: Configure PC6, PC7 and PC8 as input function (A,B,I) */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}
void RCC_Configuration(void)
{
/* Enable clock on GPIO A,B,C */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
}
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
#ifdef VECT_TAB_RAM
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //misc.h: NVIC_Priority_Table
/* Enable and set EXTI0 Interrupt to the lowest priority */
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Enable the USART2 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void SysInit(void)
{
/* This function fills the RCC_ClockFreq structure with the current
frequencies of different on chip clocks (for debug purpose) */
RCC_GetClocksFreq(&RCC_ClockFreq);
/* Configure the system ticker to 1ms */
SYSTICK_Configuration(1000);
/* NVIC configuration */
NVIC_Configuration();
/* System Clocks Configuration */
RCC_Configuration();
/* Configure the GPIO ports */
GPIO_Configuration();
/* Configure the USART ports */
USART_Configuration();
/* Configure Timer as Counter */
//TIM_Configuration();
/* Configure Button Interupt */
EXTI_Configuration();
}
void EXTI9_5_IRQHandler(void)
{
//if(EXTI_GetITStatus(EXTI_Line6) != RESET)
//{
read_encoder();
manage_increments();
/* Clear the EXTI line pending bit */
EXTI_ClearITPendingBit(EXTI_Line6);
EXTI_ClearITPendingBit(EXTI_Line7);
EXTI_ClearITPendingBit(EXTI_Line8);
//}
}
