Posted on July 23, 2012 at 22:26
hello, i am trying to make interrupt based touchscreen program, but have no luck connecting
GPIOB_pin12 to interrupt line
i was able to do so in GPIOA_pin1, but still cant figureout how to do that on GPIOB port
void touch_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB, EXTI_PinSource12);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB);
//T_PEN
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_Init(GPIOB, &GPIO_InitStructure);
EXTI_InitStructure.EXTI_Line = EXTI_Line12;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
and interrupt itself in stm32f4_it.c file:
void EXTI4_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line12) != RESET)
{
LCD_Clear(RED);
Delay(0xFFFFFF);
EXTI_ClearITPendingBit(EXTI_Line12);
}
}
i should get interrupt on falling edge, when i touch touchscreen Pen_IRQ (PORTB leg 12) goes low, i double-checked that
