JHIHAI APM32E103VET6 Review: External Interrupt (EINT)

Zachary_yo

JHIHAI APM32E103VET6 Review: External Interrupt (EINT) [Copy link]

 

Based on the project established last time, we add the corresponding external interrupt code to realize the external interrupt of the button and control the on and off of the LED light. The following is the button schematic diagram. There are three buttons in total, namely reset, B1 and B2. We use B1, which is the button connected to PA0. When the button is pressed, it is at a low level. Therefore, we need to configure PA0 as a pull-up input in the program so that the IO port is at a high level when it is not pressed. According to this working principle, start to configure the relevant code.

1. Configure GPIO as pull-up input

#define KEY1_PIN GPIO_PIN_0

#define KEY1_PORT GPIOA

#define KEY1_PORT_CLK_ENABLE() RCM_EnableAPB2PeriphClock( RCM_APB2_PERIPH_GPIOA );

GPIO_Config_T s_GPIO_InitStruct = { 0 };

/* ---Config the Clock of the Gpios--- */

KEY1_PORT_CLK_ENABLE();

/* ---Config the Clock of the Afio--- */

RCM_EnableAPB2PeriphClock( RCM_APB2_PERIPH_AFIO );

/* ---Config Key1 pin Parameters--- */

s_GPIO_InitStruct.pin = KEY1_PIN;

s_GPIO_InitStruct.mode = GPIO_MODE_IN_PU; //Configure as pull-up input

GPIO_Config( KEY1_PORT, &s_GPIO_InitStruct );

2. Configure external interrupts

EINT_Config_T s_EINT_InitStruct = { 0 };

GPIO_ConfigEINTLine( GPIO_PORT_SOURCE_A, GPIO_PIN_SOURCE_0 ); //Configure external interrupt line to PA0

s_EINT_InitStruct.line = EINT_LINE_0;

s_EINT_InitStruct.lineCmd = ENABLE;

s_EINT_InitStruct.mode = EINT_MODE_INTERRUPT; //Interrupt mode

s_EINT_InitStruct.trigger = EINT_TRIGGER_FALLING; //Falling edge trigger

EINT_Config( &s_EINT_InitStruct );

NVIC_EnableIRQRequest( EINT0_IRQn, 1, 0 ); //Configure NVIC request

3. Write interrupt service function

void EINT0_IRQHandler( void )

{

if( RESET != EINT_ReadIntFlag( EINT_LINE_0 ) )

{

if( RESET == GPIO_ReadInputBit( KEY1_PORT, KEY1_PIN ) )

{

LED1_PORT->ODATA_B.ODATA8 ^= 1;

}

EINT_ClearIntFlag( EINT_LINE_0 );

}

}

Jacktang

What to test after external interrupt evaluation

Zachary_yo

Jacktang posted on 2022-9-14 07:19 What to test after external interrupt evaluation

Serial Port

Jacktang

Zachary_yo posted on 2022-9-14 11:13 Serial port

Okay, looking forward to it

freebsder

Thanks for sharing, looking forward to the follow-up!