IAR+STM8_EXTI external IO interrupt-EEWORLD

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MCU: STM8S207SB

IO port to be operated: PD7 uses falling edge to trigger interrupt

Code:

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#include

#define LED1_FLASH PD_ODR_ODR3 = !PD_ODR_ODR3 // LED1 on the development board is connected to PD3

void GPIO_init(void)

{

PD_DDR = 0x08; // Configure the direction register PD3 output of the PD port

PD_CR1 = 0x08; // Set PD3 to push-pull output

PD_CR2 = 0x80; // Enable PD7 external interrupt

}

void EXTI_init(void)

{

EXTI_CR1 = 0x80; // PD port falling edge triggers interrupt

}

#pragma vector=0x02 // This is critical! See the following instructions.

__interrupt void EXTI_PD7_TLI(void)

{

LED1_FLASH;

}

void init_devices(void)

{

asm("sim"); // Turn off global interrupts

GPIO_init();

EXTI_init();

asm("rim"); // Enable global interrupt

}

void main( void )

{

init_devices();

// There is no program to execute in the main loop

while(1);

}

One important point to note here is the external interrupt program of PD7. I looked at the chip manual and found that the interrupt vector number of the PD port external interrupt EXTI3 is 6. Of course, according to IAR rules, the interrupt vector should be added by 2, so I wrote #pragma vector=0x08. As a result, when I pressed the button, the program did not respond and kept interrupting. Next, I had to find another way. After carefully reading the information, I found that PD7 is different from other PD ports. PD7 has a small tail TLI behind it. Looking at the TLI description in the manual, wow, TLI has the highest level of interrupt on the chip and has an independent and dedicated interrupt vector number 0. This is easy to deal with. According to IAR rules, the interrupt vector number in the chip manual + 2 = IAR interrupt vector number. The program was changed to #pragma vector=0x02. I compiled, downloaded, and ran it again, and the button finally obeyed.

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