STM32 Running Lights

void Led_init (void)

Gpio_inittypedef gpio_initstructure;

Rcc_apb2periphclockcmd (Rcc_apb2periph_gpioa, ENABLE); Enable PA Port Clock

(RCC Clock You can not see first )

GPIO 's library functions

The main use in library functions is as follows:

Gpio_init

Gpio_structinit

Gpio_setbit

Gpio_resetbit Other According to the needs of the use!

function Gpio_init

This is set to 0

Gpio_initstructure.gpio_pin = Gpio_pin_8; led0-->pa.8 Port Configuration

Gpio_initstructure.gpio_mode = gpio_mode_out_pp; Push-Pull output

Gpio_initstructure.gpio_speed = Gpio_speed_50mhz;

Gpio_init (Gpioa, &gpio_initstructure);

Gpio_setbits (Gpioa,gpio_pin_8); pa.8 Output High

GPIO Configuration

led0=0; A bit band operation Gpio_resetbits (Gpioa,gpio_pin_8) is used;

#define LED0 Paout (8)//pa8

#define PAOUT (N) bit_addr (gpioa_odr_addr,n)//output

-bit operation

#define Bitband (addr, Bitnum) ((Addr & 0xf0000000) +0x2000000+ ((addr &0xfffff) <<5) + (BITNUM<<2))

#define MEM_ADDR (ADDR) * ((volatile unsigned long *) (ADDR))

#define BIT_ADDR (ADDR, Bitnum) mem_addr (Bitband (ADDR, Bitnum))

Tell you what the register looks like?

The following table is important and must be understood!

Gpio Register Description

Port Configuration Low Register (GPIOX_CRL) (x=a. E

Port Configuration High Register (GPIOX_CRH) (x=a. E

Note that the mode[1:0]>00 is output mode, Gpio_mode_ain = 0x0,

Example Child

Gpio_initstructure.gpio_mode = gpio_mode_out_pp; Push-Pull output

GPIO_MODE_OUT_PP = 0x10, PA8 's

Rate

typedef enum

{

Gpio_speed_10mhz = 1,

Gpio_speed_2mhz,

Gpio_speed_50mhz

}gpiospeed_typedef;

#define IS_GPIO_SPEED (speed) = = Gpio_speed_10mhz) | | (speed) = = Gpio_speed_2mhz) | | \

(speed) = = Gpio_speed_50mhz))

Way

typedef enum

{Gpio_mode_ain = 0x0,

gpio_mode_in_floating = 0x04,

GPIO_MODE_IPD = 0x28,

Gpio_mode_ipu = 0x48,

Gpio_mode_out_od = 0x14,

GPIO_MODE_OUT_PP = 0x10,

Gpio_mode_af_od = 0x1C,

GPIO_MODE_AF_PP = 0x18

}gpiomode_typedef;

#define IS_GPIO_MODE (Mode) ((mode) = = Gpio_mode_ain) | | (MODE) = = gpio_mode_in_floating) | | \

(MODE) = = GPIO_MODE_IPD) | | (MODE) = = Gpio_mode_ipu) | | \

(MODE) = = Gpio_mode_out_od) | | (MODE) = = gpio_mode_out_pp) | | \

(MODE) = = Gpio_mode_af_od) | | (MODE) = = gpio_mode_af_pp))

Port Input data Register (GPIOX_IDR) (x=a). E

Port Output Data Register (GPIOX_ODR) (x=a. E

Port bit set/clear register (GPIOX_BSRR) (x=a): E

Port bit Clear Register (GPIOX_BRR) (x=a). E

STM32 Running Lights