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InterruptIn : STM32: Implemented error catching for multiple gpio irq line 

The multiple InterruptIn object with same pin_index sharing same IRQ line.
So the second object will overwrite the first one. To catch this as error,
implemented an error catching functionality.
pull/14843/head
anish-k 2021-06-30 18:43:18 +05:30
parent d83494f54b
commit 91d0a6dec0
1 changed files with 11 additions and 0 deletions
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11
targets/TARGET_STM/gpio_irq_api.c
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@ -53,6 +53,7 @@ typedef struct gpio_channel {
} gpio_channel_t;
static gpio_irq_handler irq_handler;
static uint16_t irq_channel_used = 0x00;
static gpio_channel_t channels[CHANNEL_NUM] = {
#ifdef EXTI_IRQ0_NUM_LINES
@ -331,6 +332,14 @@ int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uint32
uint32_t pin_index = STM_PIN(pin);
irq_index = pin_lines_desc[pin_index].irq_index;
if (irq_channel_used & (1<<pin_index)) {
error("InterruptIn error: irq channel conflict\n");
return -1;
}
else {
irq_channel_used |= (1<<pin_index);
}
switch (irq_index) {
#ifdef EXTI_IRQ0_NUM_LINES
case 0:
@ -457,6 +466,8 @@ void gpio_irq_free(gpio_irq_t *obj)
gpio_channel->channel_gpio[gpio_idx] = 0;
gpio_channel->channel_pin[gpio_idx] = 0;
irq_channel_used &= ~(1<<(STM_PIN(obj->pin)));
core_util_critical_section_exit();
}