STM8S external interrupt keeps going-EEWORLD

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I used the official function library and looked at the examples. The design method is basically the same:

GPIO_Init(GPIOA, (GPIO_Pin_TypeDef)(GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6), GPIO_MODE_IN_PU_IT); //Set external IO interrupt mode
EXTI_SetExtIntSensitivity(EXTI_PORT_GPIOA, EXTI_SENSITIVITY_FALL_ONLY); //Set interrupt trigger mode

Then the external interrupt can be entered, but it is found that the interrupt service function keeps entering without an interrupt source.

Solution:

When initializing external interrupts, the main interrupt must be turned off.

After initializing the external interrupt and turning on the general interrupt, the above situation is solved and the interrupt will be triggered only when the trigger source comes.

Because there is no interrupt clearing flag, this is different from other microcontrollers.

The setting of EXTI_CR1 trigger edge can only be written when the general interrupt is not enabled!

PD7 is the highest priority non-maskable hardware interrupt (TLI)

Setting order: It is best to turn off the interrupt first, set the edge-enabled pin, and finally turn on the general interrupt

DisableAllIntp();

EXTI_CR1 = **** (PD port double edge interrupt);

Init_Exti_PD_Intp();

EnableAllIntp();

In addition, the timer reading is different from 51. The order is to read TIM1->CNTRH first and then read TIM1->CNTRL

If you read it in reverse, you will not get the correct value. When writing to the CNTR register, you must first disable the timer, otherwise the value written may not be correct.

Keywords：STM8S Reference address：STM8S external interrupt keeps going

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