Question
problem read input data
Posted on May 10, 2012 at 14:12
i am on the stm32l discovery and i send a square wave on the pin PA1 but it's like i don't receive it, i'm trying to read it with the function GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_1) but it desn't work !!
int main(void){ /*Configuration de la pin1 du portA(arriver du signal detection de traverse)*/ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN; GPIO_Init(GPIOA,&GPIO_InitStructure); GPIO_PinAFConfig(GPIOA, GPIO_PinSource1, GPIO_AF_TIM2); TIM_InitStruct.TIM_Period = 849; TIM_InitStruct.TIM_Prescaler = PrescalerValue; TIM_InitStruct.TIM_ClockDivision = 0; TIM_InitStruct.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM2,&TIM_InitStruct); /*timer2 chanel 2 pin PA1*/ TIM_ICInitStruct.TIM_Channel = TIM_Channel_2; TIM_ICInitStruct.TIM_ICPolarity = TIM_ICPolarity_Rising; TIM_ICInitStruct.TIM_ICSelection = TIM_ICSelection_DirectTI; TIM_ICInitStruct.TIM_ICPrescaler = TIM_ICPSC_DIV1; TIM_ICInitStruct.TIM_ICFilter = 0x0; TIM_ICInit(TIM2, &TIM_ICInitStruct); TIM_Cmd(TIM2, ENABLE); LCD_GLASS_Configure_GPIO(); LCD_GLASS_Init(); while (1){ bitA = GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_1); sprintf(str,'' %u'',bitA); LCD_GLASS_DisplayString( (unsigned char *) str ); } }