The source files for the GPIO interrupt dispatcher library resides in the emdrv/gpiointerrupt folder, and are named gpiointerrupt.c and gpiointerrupt.h.
EFM32 has two GPIO interrupts lines, Odd and Even. If more than two interrupts are used then interrupt routine must dispatch from a callback register. This module provides small dispatcher for both GPIO interrupts enabling handling of up to 16 GPIO pin interrupts.
It is up to the user to configure and enable interrupt on given pin. This can be done using the GPIO library (emlib). This module handles the dispatch register and clearing of interrupt flags.
In order to use this dispatcher, it has to be initialized first by calling GPIOINT_Init(). Then each pin must be configured by first registering the callback function for given pin and then configure and enabling the interrupt in GPIO module.
This section contain brief descriptions of the functions in the API. You will find detailed information on parameters by clicking on the hyperlinked function names.
Your application code must include one header file: gpiointerrupt.h.
GPIOINT_Init()
This functions initializes the dispatcher register. Typically GPIOINT_Init() is called once in your startup code.
GPIOINT_CallbackRegister()
Register a callback function on a pin number.
GPIOINT_CallbackUnRegister()
Un-register a callback function on a pin number.
#include "em_gpio.h" #include "em_int.h" #include "gpiointerrupt.h" int main(void) { CHIP_Init(); // Enable clock for GPIO module, initialize GPIOINT CMU_ClockEnable(cmuClock_GPIO, true); GPIOINT_Init(); // Register callback functions and enable interrupts GPIOINT_CallbackRegister(1, gpioCallback1); GPIOINT_CallbackRegister(3, gpioCallback3); GPIOINT_CallbackRegister(8, gpioCallback8); GPIO_IntEnable(1<<1 | 1<<3 | 1<<8); while(true); }