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InterruptIn : STM32: Implemented error catching for multiple gpio on the same irq line #14843

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Merged
merged 1 commit into from
Jul 8, 2021
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InterruptIn : STM32: Implemented error catching for multiple gpio on the same irq line #14843

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11 changes: 11 additions & 0 deletions targets/TARGET_STM/gpio_irq_api.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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
Expand Down Expand Up @@ -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:
Expand Down Expand Up @@ -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();
}

Expand Down