GPIO Internal Helpers

Functions
static void	gpio_set_pclk (GPIO_REGDEF_ts const *gpio_port, EN_STATUS_te en_status)
	Enables or disables the peripheral clock for a GPIO port.
static PORT_CODES_ts	get_syscfg_code (GPIO_REGDEF_ts const *gpio_port)
	Returns the SYSCFG port code for a GPIO port instance.
static uint8_t	get_exti_position (GPIO_CFG_ts const *gpio_cfg)
	Returns the IRQ number for the EXTI line corresponding to a GPIO pin.

Detailed Description

Function Documentation

gpio_set_pclk()

void gpio_set_pclk ( GPIO_REGDEF_ts const * gpio_port, EN_STATUS_te en_status )

static

Enables or disables the peripheral clock for a GPIO port.

Calls the appropriate RCC AHB1 clock enable/disable function based on the port pointer. Called by gpio_init and gpio_deinit.

Parameters

[in]	gpio_port	Pointer to the GPIO port instance.
[in]	en_status	ENABLE to enable the clock, DISABLE to disable it.

Definition at line 188 of file stm32f401re_gpio.c.

                                                                                   {
    if(gpio_port == GPIOA) {
        rcc_set_pclk_ahb1(RCC_AHB1ENR_GPIOAEN, en_status);
    }
    else if(gpio_port == GPIOB) {
        rcc_set_pclk_ahb1(RCC_AHB1ENR_GPIOBEN, en_status);
    }
    else if(gpio_port == GPIOC) {
        rcc_set_pclk_ahb1(RCC_AHB1ENR_GPIOCEN, en_status);
    }
    else if(gpio_port == GPIOD) {
        rcc_set_pclk_ahb1(RCC_AHB1ENR_GPIODEN, en_status);
    }
    else if(gpio_port == GPIOE) {
        rcc_set_pclk_ahb1(RCC_AHB1ENR_GPIOEEN, en_status);
    }
    else if(gpio_port == GPIOH) {
        rcc_set_pclk_ahb1(RCC_AHB1ENR_GPIOHEN, en_status);
    }
}

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get_syscfg_code()

PORT_CODES_ts get_syscfg_code ( GPIO_REGDEF_ts const * gpio_port )

static

Returns the SYSCFG port code for a GPIO port instance.

The SYSCFG_EXTICRx registers use a 4-bit code to select which port is routed to a given EXTI line. This function maps port pointers to their corresponding PORT_CODES_ts values.

Parameters

[in]

gpio_port

Pointer to the GPIO port instance.

Returns

The PORT_CODES_ts code for the given port.

Definition at line 221 of file stm32f401re_gpio.c.

                                                                      {
    if(gpio_port == GPIOA) return PA;
    else if(gpio_port == GPIOB) return PB;
    else if(gpio_port == GPIOC) return PC;
    else if(gpio_port == GPIOD) return PD;
    else if(gpio_port == GPIOE) return PE;
    return PH;
}

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get_exti_position()

uint8_t get_exti_position ( GPIO_CFG_ts const * gpio_cfg )

static

Returns the IRQ number for the EXTI line corresponding to a GPIO pin.

Maps GPIO pin numbers to NVIC IRQ numbers as defined by the STM32F401RE vector table:

• Pins 0–4 have individual EXTI IRQs (EXTI0–EXTI4).
• Pins 5–9 share EXTI9_5_IRQn.
• Pins 10–15 share EXTI15_10_IRQn.

Parameters

[in]

gpio_cfg

Pointer to the GPIO configuration structure.

Returns

The IRQn_te IRQ number for the pin's EXTI line.

Definition at line 244 of file stm32f401re_gpio.c.

                                                              {
    if(gpio_cfg->pin == 0)                                  return EXTI0_IRQn;
    else if(gpio_cfg->pin == 1)                             return EXTI1_IRQn;
    else if(gpio_cfg->pin == 2)                             return EXTI2_IRQn;
    else if(gpio_cfg->pin == 3)                             return EXTI3_IRQn;
    else if(gpio_cfg->pin == 4)                             return EXTI4_IRQn;
    else if(gpio_cfg->pin < 10 && gpio_cfg->pin > 4)       return EXTI9_5_IRQn;
    return EXTI15_10_IRQn;
}

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