STM32H723 GPIO_AF7_USART1

### STM32H723 GPIO Alternate Function AF7 USART1 Configuration

For configuring the alternate function of a pin to be used with USART1 on an STM32H723 device, it is necessary to use `GPIO_PinAFConfig` or its updated equivalent from newer HAL libraries. This involves setting up not only the mode but also specifying which alternate function should be assigned to that particular pin.

The process includes selecting the appropriate GPIO port and pin source corresponding to where USART1_TX and RX are connected physically on your board. For example:

// Assuming PA9 (TX) and PA10 (RX) for USART1
__HAL_RCC_GPIOA_CLK_ENABLE(); // Enable clock for GPIOA

GPIO_InitStruct.Pin       = GPIO_PIN_9 | GPIO_PIN_10;
GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;    // Set as alternate function push-pull output
GPIO_InitStruct.Pull      = GPIO_NOPULL;        // No pull-up/pull-down resistor
GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF7_USART1;

HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

This code snippet initializes two pins (PA9 and PA10) into their respective roles within USART1 by assigning them the correct alternate function number (`GPIO_AF7_USART1`). It ensures proper communication setup between hardware components using these specific configurations[^1].

Additionally, when dealing specifically with analog functionalities such as ADCs or DACs, one does not need to set any alternate functions since those operations require placing the pin directly in analog mode without involving multiplexing through other peripherals like UARTs do[^4]. However, this detail pertains more closely to non-digital interfaces rather than serial communications handled via USART.

Once configured correctly according to application needs including baud rates among others parameters required by USART initialization routines provided either by standard peripheral library calls or higher-level abstractions offered under CMSIS-DAP framework depending upon development environment chosen – data transmission over RS-232/TTL level lines becomes feasible following successful configuration steps outlined above.