OSStatus platform_gpio_irq_enable( const platform_gpio_t* gpio, platform_gpio_irq_trigger_t trigger, platform_gpio_irq_callback_t handler, void* arg )
{
uint8_t intPort;
int i;
OSStatus err = kNoErr;
platform_mcu_powersave_disable();
require_action_quiet( gpio != NULL && trigger != IRQ_TRIGGER_BOTH_EDGES, exit, err = kParamErr);
switch( gpio->port ){
case GPIOA:
intPort = GPIO_A_INT;
break;
case GPIOB:
intPort = GPIO_B_INT;
break;
case GPIOC:
intPort = GPIO_C_INT;
break;
default:
err = kParamErr;
goto exit;
}
for( i = 0; i < NUMBER_OF_GPIO_IRQ_LINES; i++ ){
if ( gpio_irq_data[i].port == gpio->port && gpio_irq_data[i].pin == gpio->pin){
/* GPIO IRQ already exist */
gpio_irq_data[ i ].handler = handler;
gpio_irq_data[ i ].arg = arg;
break;
}
}
if(i == NUMBER_OF_GPIO_IRQ_LINES){
/* GPIO IRQ not exist */
for( i = 0; i < NUMBER_OF_GPIO_IRQ_LINES; i++ ){
if ( gpio_irq_data[i].handler == NULL ){
gpio_irq_data[ i ].port = gpio->port;
gpio_irq_data[ i ].pin = gpio->pin;
gpio_irq_data[ i ].handler = handler;
gpio_irq_data[ i ].arg = arg;
break;
}
}
/* No space to add one */
if( i == NUMBER_OF_GPIO_IRQ_LINES)
return kNoSpaceErr;
}
GpioIntClr(intPort, ((uint32_t)1 << gpio->pin));
if( trigger == IRQ_TRIGGER_RISING_EDGE )
GpioIntEn(intPort, ((uint32_t)1 << gpio->pin), GPIO_POS_EDGE_TRIGGER);
else
GpioIntEn(intPort, ((uint32_t)1 << gpio->pin), GPIO_NEG_EDGE_TRIGGER);
exit:
platform_mcu_powersave_enable();
return err;
}
// Coding key signal-A interrupt.
__attribute__((section(".driver.isr"))) void GpioInterrupt(void)
{
if(GpioIntFlagGet(CODING_KEY_A_PORT_INT) == CODING_KEY_A_BIT)
{
GpioIntClr(CODING_KEY_A_PORT_INT, CODING_KEY_A_BIT);
if((GpioGetReg(CODING_KEY_A_PORT_IN) & CODING_KEY_A_BIT) || (ClockWiseCnt != 0) || (CounterClockWiseCnt != 0))
{
return;
}
if(GpioGetReg(CODING_KEY_B_PORT_IN) & CODING_KEY_B_BIT)
{
//clockwise rotation
ClockWiseCnt++;
}
else
{
//counterclockwise rotation
CounterClockWiseCnt++;
}
}
}
