/**
* gpio irq init
*
* Initialize an external interrupt on a gpio pin
*
* @param pin Pin number to enable gpio.
* @param handler Interrupt handler
* @param arg Argument to pass to interrupt handler
* @param trig Trigger mode of interrupt
* @param pull Push/pull mode of input.
*
* @return int
*/
int
gpio_irq_init(int pin, gpio_irq_handler_t handler, void *arg,
gpio_irq_trig_t trig, enum gpio_pull pull)
{
int rc;
int irqn;
int index;
uint32_t pin_mask;
EXTI_InitTypeDef exti_cfg;
/* Configure the gpio for an external interrupt */
rc = 0;
pin_mask = GPIO_MASK(pin);
index = GPIO_INDEX(pin);
exti_cfg.EXTI_Line = index;
exti_cfg.EXTI_Mode = EXTI_Mode_Interrupt;
switch (trig) {
case GPIO_TRIG_NONE:
rc = -1;
break;
case GPIO_TRIG_RISING:
exti_cfg.EXTI_Trigger = EXTI_Trigger_Rising;
break;
case GPIO_TRIG_FALLING:
exti_cfg.EXTI_Trigger = EXTI_Trigger_Falling;
break;
case GPIO_TRIG_BOTH:
exti_cfg.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
break;
case GPIO_TRIG_LOW:
rc = -1;
break;
case GPIO_TRIG_HIGH:
rc = -1;
break;
default:
rc = -1;
break;
}
exti_cfg.EXTI_LineCmd = ENABLE;
/* Check to make sure no error has occurred */
if (!rc) {
/* Disable interrupt and clear any pending */
gpio_irq_disable(pin);
EXTI_ClearFlag(pin_mask);
gpio_init_in(pin, pull);
/* Configure SYSCFG */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
/* Configure EXTI */
SYSCFG_EXTILineConfig(GPIO_PORT(pin), index);
EXTI_Init(&exti_cfg);
/* Set the gpio irq handler */
gpio_irq_handlers[index].isr = handler;
gpio_irq_handlers[index].arg = arg;
/* Configure the GPIO */
if (!rc) {
/* Enable interrupt vector in NVIC */
irqn = hal_gpio_pin_to_irq(pin);
hal_gpio_set_nvic(irqn);
}
}
return rc;
}
/**
* gpio irq init
*
* Initialize an external interrupt on a gpio pin
*
* @param pin Pin number to enable gpio.
* @param handler Interrupt handler
* @param arg Argument to pass to interrupt handler
* @param trig Trigger mode of interrupt
* @param pull Push/pull mode of input.
*
* @return int
*/
int
hal_gpio_irq_init(int pin, hal_gpio_irq_handler_t handler, void *arg,
hal_gpio_irq_trig_t trig, hal_gpio_pull_t pull)
{
int rc;
int irqn;
int index;
uint32_t pin_mask;
uint32_t mode;
GPIO_InitTypeDef cfg;
/* Configure the gpio for an external interrupt */
rc = 0;
switch (trig) {
case HAL_GPIO_TRIG_NONE:
rc = -1;
break;
case HAL_GPIO_TRIG_RISING:
mode = GPIO_MODE_IT_RISING;
break;
case HAL_GPIO_TRIG_FALLING:
mode = GPIO_MODE_IT_FALLING;
break;
case HAL_GPIO_TRIG_BOTH:
mode = GPIO_MODE_IT_RISING_FALLING;
break;
case HAL_GPIO_TRIG_LOW:
rc = -1;
break;
case HAL_GPIO_TRIG_HIGH:
rc = -1;
break;
default:
rc = -1;
break;
}
/* Check to make sure no error has occurred */
if (!rc) {
/* Disable interrupt and clear any pending */
hal_gpio_irq_disable(pin);
pin_mask = HAL_GPIO_PIN(pin);
__HAL_GPIO_EXTI_CLEAR_FLAG(pin_mask);
/* Set the gpio irq handler */
index = HAL_GPIO_PIN_NUM(pin);
hal_gpio_irq[index].isr = handler;
hal_gpio_irq[index].arg = arg;
hal_gpio_irq[index].invoked = 0;
/* Configure the GPIO */
cfg.Mode = mode;
cfg.Pull = pull;
rc = hal_gpio_init_stm(pin, &cfg);
if (!rc) {
/* Enable interrupt vector in NVIC */
irqn = hal_gpio_pin_to_irq(pin);
hal_gpio_set_nvic(irqn);
}
}
return rc;
}
