STM32F103ZET6 —— GPIO-EEWORLD

Collect

The GPIO of STM32 can be configured by software into several different modes. Each I/O port bit can be freely programmed, but the I/O port register must be accessed as a 32-bit word:

A. Chip side:

1. Input:

MODE	Descriptions
Input floating	The pin is configured to be floating and connected to a Schmitt trigger. The common scenario is external buttons.
Input pull-up	The input is connected to a pull-up resistor to clamp the uncertain signal to a high level
Input Dropdown	The input is connected to a pull-down resistor to clamp the uncertain signal to a low level
Analog Input	The signal directly enters the ADC module, which means that the status of the IO port can no longer be read from the input register.

2. Output:

MODE	Descriptions
Open-drain output	The so-called open drain refers to the drain of the MOSFET. When the IO outputs 1, it is suspended and requires an external circuit pull-up resistor to achieve a high-level output (low-level grounding). It is generally used in situations where the levels do not match, and different level outputs are achieved through external pull-up and pull-down resistors.
Push-pull output	Output 0 is connected to GND, output 1 is connected to VCC (ie 0=》GND, 1=》3.3V)
Open-drain multiplexing	PinMux to other functions
Push-Pull Multiplexing	PinMux to other functions

B. Hardware side:

The corresponding board has two GPIOs connected to the LED:

Uses GPIO Port G Pin13 and Pin14

C. Code side:

The steps required to configure the above two GPIOs to work are as follows:

1. Enable the corresponding GPIO_G clock

2. Configure GPIO_G13/GPIO_G14 as general push-pull output, and configure the port line flip speed to 50M

3. After configuration is complete, set the port output to 1/0 to control the GPIO output.

1. Clock settings:

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOG, ENABLE); // Here RCC_APB2Periph_GPIOG is (0x01 << 8)

void RCC_APB2PeriphClockCmd(uint32_t RCC_APB2Periph, FunctionalState NewState)

{

/* Check the parameters */

assert_param(IS_RCC_APB2_PERIPH(RCC_APB2Periph));

assert_param(IS_FUNCTIONAL_STATE(NewState));

if (NewState != DISABLE)

{

RCC->APB2ENR |= RCC_APB2Periph;

}

else

{

RCC->APB2ENR &= ~RCC_APB2Periph;

}

2. Configure GPIO_G13/GPIO_G14 as general push-pull output, 50M speed

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13|GPIO_Pin_14;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOG, &GPIO_InitStructure);

3. Configure output:

STM32 provides multiple ways to configure GPIO output 1/0, including directly writing 1/0 registers (GPIOx_ODR) to the port, registers specifically set to 1 value (GPIOx_BSRR), and registers specifically set to 0 value (GPIOx_BRR). You can use them at will:

#define LED1_ON GPIO_SetBits(GPIOG, GPIO_Pin_13);

#define LED1_OFF GPIO_ResetBits(GPIOG, GPIO_Pin_13);

#define LED2_ON GPIO_SetBits(GPIOG, GPIO_Pin_14);

#define LED2_OFF GPIO_ResetBits(GPIOG, GPIO_Pin_14);

void GPIO_SetBits(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)

{

/* Check the parameters */

assert_param(IS_GPIO_ALL_PERIPH(GPIOx));

assert_param(IS_GPIO_PIN(GPIO_Pin));

GPIOx->BSRR = GPIO_Pin;

}

void GPIO_ResetBits(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)

{

/* Check the parameters */

assert_param(IS_GPIO_ALL_PERIPH(GPIOx));

assert_param(IS_GPIO_PIN(GPIO_Pin));

GPIOx->BRR = GPIO_Pin;

}

The basic usage is as described above. Later, in the specific peripheral part, the multiplexing function of GPIO will be introduced.

Keywords：STM32F103ZET6 GPIO Reference address：STM32F103ZET6 —— GPIO

Previous article：STM32F103ZET6 — USART
Next article：STM32 Boot mode setting method

Recommended ReadingLatest update time:2024-11-16 12:25

Silicon C8051F340 GPIO port configuration and use

1. Background: I used C8051 a long time ago. Now I need to use C8051 again. But I forget all the experience I had a year ago. Basically, it is almost done. Even the most basic GPIO port configuration still requires a new look at the manual, so here is a note to keep in mind for quick reference next time.

[Microcontroller]

Silicon C8051F340 GPIO port configuration and use

stm32-GPIO operation (library function)

It's rare to have time, so I want to write about the basics of stm32 recently. 8 ways of GPIO 1. Floating input GPIO_IN_FLOATING ——Floating input, can be used for KEY recognition, RX1 2. GPIO_IPU with pull-up input——IO internal pull-up resistor input 3. GPIO_IPD with pull-down input——IO internal pul

[Microcontroller]

STM8 GPIO modes

GPIO_Mode_In_FL_No_IT No interrupt for floating input GPIO_Mode_In_PU_No_IT Pull-up input without interrupt GPIO_Mode_In_FL_IT Floating input has interrupt GPIO_Mode_In_PU_IT Pull-up input has interrupt GPIO_Mode_Out_OD_Low_Fast Output open-drain, low level, 10MHz GPIO_Mode_Out_PP_Low_Fast Output push-pull, l

[Microcontroller]

NXP-LPC1768 Getting Started: Development Environment Construction and GPIO

1. Environment Construction This project uses ARM's MDK414. Lower versions may result in failure to download debuggers in MDK. The emulator uses SEGGER's JlinkV7. First, create a new project GPIO, select the path to save, and then the chip selection interface will appear Then confirm, create a new main file main.c a

[Microcontroller]

STM32: GPIO basics and corresponding pin operation library functions

USE_STDPERIPH_DRIVER, STM32F10X_HD The English abbreviations of the startup files in the STM32 firmware library Libraries\CMSIS\Core\CM3\startup\arm mean: cl: interconnected product, stm32f105/107 series vl: value product, stm32f100 series xl: ultra-high density (capacity) product, stm32f101/103 series ld: low-densit

[Microcontroller]

GPIO_Write() Function

void GPIO_Write(GPIO_TypeDef* GPIOx, uint16_t PortVal) { /* Check the parameters */ assert_param(IS_GPIO_ALL_PERIPH(GPIOx)); GPIOx- ODR = PortVal; } You can assign values to multiple IO ports at one time (note: it is 16 bits!) Example: GPIO_Write(GPIOD,0x0100) //Set PD8 high

[Microcontroller]

Summary of 8 working modes of GPIO in STM32

1. Push-pull output: can output high and low levels, connect digital devices; push-pull structure generally refers to two transistors being controlled by two complementary signals, one transistor is always turned on while the other is turned off. The high and low levels are determined by the power supply of the IC. A

[Microcontroller]

Summary of 8 working modes of GPIO in STM32

STM32 GPIO related registers (Part 2)

STM32 microcontrollers can only communicate with the outside world if they have ports. Only by learning how to control ports can we make better use of peripherals, establish connections with the outside world, and give full play to our own advantages. First, let's introduce the basic GPIO related registers:

[Microcontroller]

Popular Resources
Popular amplifiers