CODEWITHSUNDEEP
sensorsstm32adc
pranathi
pranathi

Reputation: 393

generating EXTI0 interrupt when extenal temperature sensor is connected to STM32F207VC

I am using STM32F207VC controller . I have my external probe temperature sensor connected to one of the internal ADC channel of stm32.

I want to generate an external interrupt when this is connected to controller and i should start measuring from external temperature sensor.

Please could any one provide me code or any help in this

Thanks

Upvotes: 1

Views: 16128

Answers (1)

Verax
Verax

Reputation: 2519

I have an STM32F4 processor interfaced with a Solomon Systems SSD1963 GPU. The GPU has a Tearing Signal (TE) that notifies the processor when it is about to do a vertical refresh. I hope you can use this code as an example and adapt it to your solution.

The TE signal is connected to the CPU's GPIO G7 pin. So first I have to configure the GPIO pin.

//GPIO Pin G7
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOG, &GPIO_InitStructure);

Next I have to configure the interrupt and NVIC.

SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOG, EXTI_PinSource7);

EXTI_InitTypeDef EXTI_InitStructure;
EXTI_StructInit(&EXTI_InitStructure);
EXTI_InitStructure.EXTI_Line = EXTI_Line7;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);

NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

Finally I have to create the interrupt handler. The EXTI9_5_IRQHandler handles external interrupts on lines 5 ~ 7. This method is actually defined in my CPUs startup assembly file as a weak reference. I just need to redefine the method and the linker will do the rest.

extern "C" void EXTI9_5_IRQHandler(void)
{
    if(EXTI_GetITStatus(EXTI_Line7) != RESET)
    {
        //Handle the interrupt

        EXTI_ClearITPendingBit(EXTI_Line7);
    }
}

I'm using Mentor Graphics' Sourcery Codebench Lite as my toolchain.

Upvotes: 1

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