Task you are tasked with configuring gpio port b pin 3 pb3 on an stm32 microcontroller to function as a digital output you
need to set up the pins output mode maximum output speed and ensure its in pushpull configuration additionally you must

Question

Task: You are tasked with configuring GPIO Port B Pin 3 (PB3) on an STM32 microcontroller to function as a digital output. You need to set up the pin's output mode, maximum output speed, and ensure it's in push-pull configuration. Additionally, you must use bit-shifting operations to configure the necessary bits in the GPIOx_MODER, GPIOx_OSPEEDR, and GPIOx_OTYPER registers.

Tasks:

The positions of the bits corresponding to PB3 in the GPIOx_MODER, GPIOx_OSPEEDR, and GPIOx_OTYPER registers are:

GPIOx_MODER: Bits 6-7
GPIOx_OSPEEDR: Bits 6-7
GPIOx_OTYPER: Bit 3

Calculate the necessary bit-shift operations to configure PB3 for digital output, maximum output speed, and push-pull configuration.

See the C code snippet to configure PB3 accordingly using bit-shifting operations.

#include "stm32f4xx.h"

int main(void)
{
    // Configure PB3 as digital output, maximum speed, push-pull
    GPIOB->MODER   = ____________; // Set MODER bits 6-7 to 01 for output
    GPIOB->OSPEEDR = ____________; // Set OSPEEDR bits 6-7 to 11 for maximum speed
    GPIOB->OTYPER  = ____________; // Clear OTYPER bit 3 for push-pull configuration
    
    // Other initialization and main program logic here
    while (1)
    {
        // Main program loop
    }
}

Dr Nathan Williams · Answer

Here’s how you can configure GPIO Port B Pin 3 (PB3) on an STM32 microcontroller for digital output, maximum speed, and push-pull configuration using bit-shifting operations:

Set PB3 (Bits 6-7 in GPIOB_MODER) to Output Mode (01):

GPIOB->MODER &= ~(3UL << 6); // Clear bits 6-7
GPIOB->MODER |= (1UL << 6);  // Set bit 6 to 1 and bit 7 to 0 (01)

Set PB3 (Bits 6-7 in GPIOB_OSPEEDR) to Maximum Speed (11):

GPIOB->OSPEEDR &= ~(3UL << 6); // Clear bits 6-7
GPIOB->OSPEEDR |= (3UL << 6);  // Set bits 6-7 to 11

Configure PB3 (Bit 3 in GPIOB_OTYPER) as Push-Pull (0):
```
GPIOB->OTYPER &= ~(1UL << 3); // Clear bit 3
```

Combining these commands yields the full C code snippet:

#include "stm32f4xx.h"

int main(void) {
    // Enable the clock for GPIOB
    RCC->AHB1ENR |= RCC_AHB1ENR_GPIOBEN;

    // Configure PB3 as digital output, maximum speed, push-pull
    GPIOB->MODER &= ~(3UL << 6); // Clear MODER bits 6-7
    GPIOB->MODER |= (1UL << 6);  // Set MODER bits 6-7 to 01 for output

    GPIOB->OSPEEDR &= ~(3UL << 6); // Clear OSPEEDR bits 6-7
    GPIOB->OSPEEDR |= (3UL << 6);  // Set OSPEEDR bits 6-7 to 11 for maximum speed

    GPIOB->OTYPER &= ~(1UL << 3);  // Clear OTYPER bit 3 for push-pull configuration

    // Other initialization and main program logic here
    while (1) {
        // Main program loop
    }
}

In this code:

RCC->AHB1ENR |= RCC_AHB1ENR_GPIOBEN; enables the clock for GPIO Port B, which is required before we can configure the port.
The bit-shifting operations ensure that the correct bits are set without affecting other bits in the registers.

Remember:

GPIOB->MODER register sets the mode (input, output, alternate function, analog) for each pin.
GPIOB->OSPEEDR register sets the output speed for each pin.
GPIOB->OTYPER register configures the output type (push-pull or open-drain) for each pin.

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