![]() ![]() This register will do the atomic set/reset. When you want to set or reset a particular bit or pin, you can use this register. Then what if I want to write a single bit without disturbing others? There is a way to do that. Because you may disturb the other Pins (bits) of the register which you don’t want to. You have to be careful when you are writing the GPIO port using this GPIOx_ODR. Now we can write the GPIO pins like below. Let’s assume that I have configured PORT B as output, using the GPIOB_MODERregister and other control registers. That’s why we are using a pullup resistor for the open-drain pins. If you write low to the GPIO pin, it will be left floating since the switch will be turned off. So If you write high to the GPIO pin using software, it will be connected to the ground through the switch. In open-drain mode, inside the microcontroller one switch (transistor/MOSFET) is connected to the GPIO pin and the ground. If you have worked on I2C you must have heard this. First, we need to know what is push-pull and open drain. This is the GPIO output type register which is used to select the output type (Push-Pull or Open Drain). So, we will use either Input mode or output mode. In this tutorial, we are using only the I/O operation. Here 2-bits are combined for one particular GPIO pin.īits – MODERy : Direction selection for port X and bit Y, (y = 0 … 15)Ġ0: Input (reset state) 01: General purpose output mode 10: Alternate Function mode 11: Analog mode You can go to the section directly based on the microcontroller that you have. In this post, we have used three microcontrollers ( STM32F1, STM32F4, STM32F7) for demonstration. Please click the controller-specific tab and see the content properly. ![]() If you have any one of the controllers or ARM cortex, you can use that. In this tutorial, we are going to see the timer for the below three STM32 controllers. STM32 GPIO Tutorial – Switch/Button interfacing with STM32īefore starting this STM32 GPIO Tutorial, Please go through the below tutorials.STM32 GPIO Tutorial – LED Interfacing with STM32.GPIO Port configuration lock register (GPIOx_LCKR).Port bit set/reset register (GPIOx_BSRR).GPIO Port output data register (GPIOx_ODR).GPIO Port input data register (GPIOx_IDR).GPIO Port configuration register high (GPIOx_CRH).GPIO Port configuration register low (GPIOx_CRL).STM32 GPIO Tutorial – Bare Metal Part 2. ![]()
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