Posted on September 11, 2015 at 13:23Hi ,
I'm using STM32F103 and i have an input signal on Timer1_ch3 (PA10) which generates an EXTI interrupt and it's working well.
I have another input signal on Timer2_ch3, but something strange happens when i connect this signal on the default Timer2_ch3 pin (PA2),
it affects the EXTI interrupt and it becomes generated twice : one time like previous with the first signal and second time with the falling edge of the second signal!!!
but when i avoid PA2 and remap the Timer2_ch3 on PB10 it works well. i can't understand why and i need to use PA2.
void Init(void)
{
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 ;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_PinRemapConfig(GPIO_FullRemap_TIM2, ENABLE);
/* GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 ; // if i use PA2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure); */
GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource10);
EXTI_InitStructure.EXTI_Line = EXTI_Line10;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
