Shulou(Shulou.com)06/01 Report--

This article mainly introduces what different GPIO drivers STM32 has, which is very detailed and has a certain reference value. Friends who are interested must finish it!

1 Library function version

The most commonly used version, using the ST standard peripheral library

Void Led_Key_Init (void) {GPIO_InitTypeDef GPIO_Init_s; RCC_APB2PeriphClockCmd (RCC_APB2Periph_GPIOE, ENABLE); / / enable clock GPIO_Init_s.GPIO_Pin = GPIO_Pin_4; GPIO_Init_s.GPIO_Mode = GPIO_OType_PP; GPIO_Init_s.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init_s.GPIO_PuPd = GPIO_PuPd_UP GPIO_Init (GPIOE, & GPIO_Init_s);}

Open source code:

Https://github.com/strongercjd/STM32F207VCT6/tree/master/06-GPIO-Input-Output

2 register version

The register version actually copies the ST standard peripheral library, which can simplify some operations.

/ * use the register-start*///TP---PA15 # define TP_PORT GPIOA # define TP_PIN GPIO_Pin_15 # define TP_OUT () TP_PORT- > CRH&=0X0FFFFFFF; TP_PORT- > CRH | = 0X50000000; / /! IO output # define TP_IN () TP_PORT- > CRH&=0X0FFFFFFF; TP_PORT- > CRH | = 0X40000000 / /! IO enter # define TP_READ () ((TP_PORT- > IDR) > 15)? 1:0) / /! BSRR = TP_PIN;// write 1#define TP_CLR () TP_PORT- > BRR = TP_PIN / / write 0#define TP_DATA_SET () TP_SET () / / IO write 1#define TP_DATA_CLR () TP_CLR () / / IO write 0#define TP_DATA_OUT () TP_OUT () / / set IO to output # define TP_DATA_IN () TP_IN () / / set IO as input # define TP_DATA_READ () TP_READ () / / read the level of IO / * use registers-end*/

Open source code:

Https://github.com/strongercjd/STM32F207VCT6/tree/master/06-GPIO-Input-Output

3-bit segment version

Based on bit segment, easy to operate

/ * LED configuration-PE4*/#define GPIO_IDR_OFFSET (GPIOE_BASE+0x10-PERIPH_BASE) # define GPIO_ODR_OFFSET (GPIOE_BASE+0x14-PERIPH_BASE) # define GPIO_BitNumber 4#define GPIO_OUT_BB (PERIPH_BB_BASE + (GPIO_ODR_OFFSET * 32) + (GPIO_BitNumber * 4)) # define GPIO_OUT_DATA * (_ IO uint32_t *) GPIO_OUT_BB # define GPIO_ IN_BB (PERIPH_BB_BASE + (GPIO_IDR_OFFSET * 32) + (GPIO_BitNumber * 4)) # define GPIO_IN_DATA * (_ _ IO uint32_t *) GPIO_IN_BB # define GPIO_DIR_REG * (_ _ IO uint32_t *) (GPIOE_BASE+0X00) # define PE4_SET () GPIO_OUT_DATA = 1 / /! < IO write 1#define PE4_CLR () GPIO_OUT_DATA = 0 / /! < IO write 0#define PE4_OUT () GPIO_DIR_REG = (GPIO_DIR_REG) & 0xFFFFFCFF) | 0x00000100) / /! IO output # define PE4_IN () GPIO_DIR_REG = ((GPIO_DIR_REG) & 0xFFFFFCFF) /! IO input # define PE4_READ () GPIO_IN_DATA / /!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.