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What output data register?
GPIO Output data register is used to control the I/O state of the I/O pins. If you write one means corresponding I/O pin as high and if you write 0 means corresponding I/O pin as is low. So, these bits can be read and written by software.
What is GPIO IDR?
IDR stands for Input Data Register. ODR is one of GPIO registers which holds all output states of pins of a GPIO port. We can alter with 16bit binary value and we specify the pin values with this register. IDR is one of the GPIO registers which holds the input states of pins of a GPIO port.
What is the use of data output register?
A register is basically a storage space for units of memory that are used to transfer data for immediate use by the CPU (Central Processing Unit) for data processing. Also known as memory registers, they can actually form part of the computer processor as a processor register.
How to set GPIO output type in STM32?
The output type can be configured in the GPIOx_OTYPER Register. Since I want to blink the LED on pin PA5, i will choose the push-pull type output, and to do so, I need to write a ‘ 0 ‘ in the 5th position Next, The output speed can be configured in the GPIOx_OSPEEDR Register
How many registers are there in a GPIO port?
Each of the general-purpose I/O ports has two 32-bit configuration registers, two 32-bit data registers, a 32-bit set/reset register, a 16-bit reset register, and a 32-bit locking register. Each I/O port bit is freely programmable, however, the I/O port registers have to be accessed as 32-bit words (half-word or byte accesses are not allowed).
Which is the atomic write register in STM32?
In case of GPIO configuration registers of STM32, we can perform atomic write operations using the dedicated BSRR and BRR registers. BSRR is a 32-bit register where the lower 16-bits are used to set any of the 16 pins and the higher 16-bits to clear/reset any of the 16 pins of a particular IO port.
What do you need to know about STM32 microcontroller?
In STM32 microcontroller to activate a particular port you need to access APB2 register. The APB2 register in this Microcontroller is shown below. Out of that bit 16 to 31 are reserved, where user will not have any control. Bit 0 to 16 pins can be read or written.