TM_EXTI_Functions

Library Functions. More...

Macros
#define	TM_EXTI_SoftwareInterrupt(GPIO_Line)   (EXTI->SWIER |= (GPIO_Line))
	Creates software interrupt for specific external GPIO line. More...

Functions
TM_EXTI_Result_t	TM_EXTI_Attach (GPIO_TypeDef *GPIOx, uint16_t GPIO_Line, TM_EXTI_Trigger_t trigger)
	Attach external interrupt on specific GPIO pin. More...
TM_EXTI_Result_t	TM_EXTI_Detach (uint16_t GPIO_Line)
	Detach GPIO pin from interrupt lines. More...
void	TM_EXTI_DeInit (void)
	Clears all interrupts on EXTI line. More...
void	TM_EXTI_Handler (uint16_t GPIO_Pin)
	EXTI Global handler. More...

Detailed Description

Library Functions.

Macro Definition Documentation

#define TM_EXTI_SoftwareInterrupt

(

GPIO_Line

)

(EXTI->SWIER |= (GPIO_Line))

Creates software interrupt for specific external GPIO line.

Note

This also works for others EXTI lines from 16 to 23

Parameters

GPIO_Line

GPIO line where you want software interrupt

Return values

None

Note

Defined as macro for faster execution

Function Documentation

TM_EXTI_Result_t TM_EXTI_Attach	(	GPIO_TypeDef *	GPIOx,
		uint16_t	GPIO_Line,
		TM_EXTI_Trigger_t	trigger
	)

Attach external interrupt on specific GPIO pin.

Note

This function automatically enables the clock for GPIO peripheral and also sets pull resistors depending on trigger you use.

• Falling edge: pull up is enabled
• Rising edge: pull down is enabled
• Any edge: no pull activated

You can attach only one GPIOx to specific GPIO_PIN. In other words, GPIO_PIN_5 can not be attached to GPIOA and GPIOB at the same time. If you will try that, my function will return error to you, because you have to detach GPIO_Line first and attach back on other GPIO port.

Parameters

*GPIOx	GPIO port where you want EXTI interrupt line
GPIO_Line	GPIO pin where you want EXTI interrupt line. Use OR (|) operator if you want to attach interrupt on more than one GPIO pin at the same GPIOx at the same time.
trigger	Pin trigger source. This parameter can be a value of TM_EXTI_Trigger_t enumeration

Return values

Attach

result: TM_EXTI_Result_Ok: Everything ok, interrupt attached TM_EXTI_Result_Error: An error occurred, interrupt was not attached

Note

If you use more than one GPIO_Pin with OR (|) operator at single call and if GPIO_Pin can't be attached because there is already one GPIO_Pin at this line, function will return error and other pins might not be initialized. If function return

• TM_EXTI_Result_Ok, then all pins are attached correctly.

void TM_EXTI_DeInit

(

void

)

Clears all interrupts on EXTI line.

Note

It clears bits for external pins (bit 0 to bit 15) only! It has no effect for internally connected peripherals (like RTC) to EXTI line

Parameters

None

Return values

None

TM_EXTI_Result_t TM_EXTI_Detach

(

uint16_t

GPIO_Line

)

Detach GPIO pin from interrupt lines.

Parameters

GPIO_Line

GPIO line you want to disable. Valid GPIO is GPIO_Pin_0 to GPIO_Pin_15. Use OR (|) operator if you want to detach interrupt in more than one GPIO pin at the same GPIOx at the same time.

Return values

Detaching

result: TM_EXTI_Result_Ok: Everything ok TM_EXTI_Result_Error: An error occurred

void TM_EXTI_Handler

(

uint16_t

GPIO_Pin

)

EXTI Global handler.

Note

This function is called from TM EXTI library each time any interrupt occurs on EXTI line.

With __weak parameter to prevent link errors if not defined by user.

Parameters

GPIO_Pin

GPIO Line where interrupt occurred so you can identify what to do

Return values

None