Contributed by WangChong, curated by Ai-Thinker

Recently I've been studying interrupts on the Xiao An Pai. Last night I wrote a demo to test it. What an interrupt is has already been explained very clearly. First, here are my references. The first is the interrupt article written by Ze Ge:

1. http://ai-thinker.com/forum.php?mod=viewthread&tid=562&highlight=%E4%B8%AD%E6%96%AD&_dsign=fe47e0a0

This one was written by me:

1. http://ai-thinker.com/forum.php?mod=viewthread&tid=577&extra=&_dsign=5aff987a

Since everyone understands the principle, here's the code directly:

#include "bflb_mtimer.h"
#include "board.h"
#include "bflb_gpio.h"
#define DBG_TAG "MAIN"
#include "log.h"
struct bflb_device_s *gpio;
struct bflb_device_s *led;
/**
* @brief interrupt callback function
*
*/
void interrupted_function()
{
    // actually this check is unnecessary; if we're here, the interrupt was definitely triggered
    bool intstatus = bflb_gpio_get_intstatus(gpio, GPIO_PIN_10);
    if (intstatus) {
        printf("Interrupt \r\n");
        // clear the interrupt flag
        bflb_gpio_int_clear(gpio, GPIO_PIN_10);
        printf("clean successful \r\n");
    }
}
void init_GPIO_interruption()
{
    // high level trigger
    bflb_gpio_int_init(gpio, GPIO_PIN_10, GPIO_INT_TRIG_MODE_SYNC_HIGH_LEVEL);
    // whether to mask the interrupt
    bflb_gpio_int_mask(gpio, GPIO_PIN_10, 0);
    // bind the interrupt callback function
    bflb_irq_attach(gpio->irq_num, interrupted_function, NULL);
}
int main(void)
{
    board_init();
    // initialize GPIO
    gpio = bflb_device_get_by_name("gpio");
    // initialize the interrupt
    init_GPIO_interruption();
    // enable the interrupt according to the GPIO interrupt number
    bflb_irq_enable(gpio->irq_num);
    while (1) {
        // interrupt not triggered
        printf("correct!");
    };
}

Expected result:After connecting with a serial tool, the console keeps printing "Interrupt" and "clean successful". If you connect a Dupont wire from IO10 to GND at this time, it will print "correct!" instead.

Tutorial section:

Two library files are mainly used here: #include "bflb_gpio.h" and bflb_irq.h

#define GPIO_INT_TRIG_MODE_SYNC_FALLING_EDGE 0
#define GPIO_INT_TRIG_MODE_SYNC_RISING_EDGE  1
#define GPIO_INT_TRIG_MODE_SYNC_LOW_LEVEL    2
#define GPIO_INT_TRIG_MODE_SYNC_HIGH_LEVEL   3
#if defined(BL602) || defined(BL702)
#define GPIO_INT_TRIG_MODE_ASYNC_FALLING_EDGE 4
#define GPIO_INT_TRIG_MODE_ASYNC_RISING_EDGE  5
#define GPIO_INT_TRIG_MODE_ASYNC_LOW_LEVEL    6
#define GPIO_INT_TRIG_MODE_ASYNC_HIGH_LEVEL   7
#else
#define GPIO_INT_TRIG_MODE_SYNC_FALLING_RISING_EDGE 4
#define GPIO_INT_TRIG_MODE_ASYNC_FALLING_EDGE       8
#define GPIO_INT_TRIG_MODE_ASYNC_RISING_EDGE        9
#define GPIO_INT_TRIG_MODE_ASYNC_LOW_LEVEL         10
#define GPIO_INT_TRIG_MODE_ASYNC_HIGH_LEVEL        11
#endif

The method is as follows:

/**
* @brief whether to mask the GPIO interrupt; if masked here, the interrupt cannot be entered
*
* @param [in] dev device handle
* @param [in] pin gpio pin, use @ref GPIO_PIN
* @param [in] mask true means disable, false means enable
*/
void bflb_gpio_int_mask(struct bflb_device_s *dev, uint8_t pin, bool mask);

/**
* @brief get the GPIO interrupt status
*
* @param [in] dev device handle
* @param [in] pin gpio pin, use @ref GPIO_PIN
* @return true means yes, false means no
*/
bool bflb_gpio_get_intstatus(struct bflb_device_s *dev, uint8_t pin);

/**
* @brief clear the GPIO interrupt flag
*
* @param [in] dev device handle
* @param [in] pin gpio pin, use @ref GPIO_PIN
*/
void bflb_gpio_int_clear(struct bflb_device_s *dev, uint8_t pin);

/**
* @brief bind the GPIO interrupt to a method
*
* @param [in] irq irq number
* @param [in] isr interrupt callback
* @param [in] this parameter seems to be miswritten by Ze Ge; it seems to be the formal parameter of the data callback function. Pass NULL if nothing needs to be passed
* @return A negated errno value on failure.
*/
int bflb_irq_attach(int irq, irq_callback isr, void *arg);

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main.zip(773 Bytes, downloads: 2)

Uploaded 2023-10-21 17:37

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