HAL GPIO Use Cases ¶

This chapter covers various use cases for the GPIO HAL module.

Process ¶

User application toggling an IO ¶

Called functions:

User application configuring a GPIO pin in INPUT mode ¶

Called functions:

User application configuring a GPIO pin in Alternate mode ¶

Called functions:

User application Configuring GPIO pin in INPUT mode to use with EXTI line through EXTI mux ¶

$@startuml hide footbox skinparam ParticipantPadding 150 skinparam DefaultFontSize 26 skinparam ArrowFontSize 24 skinparam NoteFontSize 22 skinparam boxPadding 80 skinparam backgroundColor #FBFBFB skinparam DiagramBorderColor #black skinparam DiagramBorderThickness 2 skinparam Padding 6 scale 1600 Width !pragma teoz true ||| ||| == Initialization == ||| ||| "User Application" -> "System Driver": **HAL_Init()** note right: **Configure System Clock** "System Driver" --> "User Application": hal status: HAL_OK note left: **return** group #LightBlue **#if defined (USE_HAL_GPIO_CLK_ENABLE_MODEL) && (USE_HAL_GPIO_CLK_ENABLE_MODEL == HAL_CLK_ENABLE_NO) ** ||| "User Application" -> "RCC": **Enable the current GPIO port Clock** ||| ||| end group "User Application" -> "HAL GPIO Driver": **HAL_GPIO_Init(HAL_GPIOB, HAL_GPIO_PIN_2 ,&p_gpio_config)** note right: **Initialize the GPIO Pin to use** "HAL GPIO Driver" --> "User Application": hal status: HAL_OK note left: **return** group #LightBlue **#if defined (USE_HAL_GPIO_CLK_ENABLE_MODEL) && (USE_HAL_GPIO_CLK_ENABLE_MODEL > HAL_CLK_ENABLE_NO) ** ||| "HAL GPIO Driver" -> "RCC": **Enable the current GPIO port Clock** ||| ||| end group "User Application" -> "HAL EXTI Driver": **HAL_EXTI_Init(&hexti, HAL_EXTI_LINE_2)** note right: **Initialize the EXTI.**\n**Store Line into Handle** "HAL EXTI Driver" --> "User Application": hal status: HAL_OK note left: **return** ||| ||| == Configuration == ||| ||| "User Application" -> "HAL EXTI Driver": **HAL_EXTI_SetConfig(&hexti, &p_exti_config)** note right: **Configure the EXTI Line**\n**stored in the handle** "HAL EXTI Driver" --> "User Application": hal status: HAL_OK note left: **return** ||| ||| == NVIC Settings == ||| ||| "User Application" -> "System Driver": **HAL_CORTEX_NVIC_SetPriority(EXTI2_IRQn, \ HAL_CORTEX_NVIC_PREEMP_PRIORITY_0, HAL_CORTEX_NVIC_SUB_PRIORITY_0)** note right: **Configure EXTI line**\n**IRQ priority** "System Driver" --> "User Application": Priority set "User Application" -> "System Driver": **HAL_CORTEX_NVIC_EnableIRQ( EXTI2_IRQn)** note right: **Enable EXTI line**\n**interrupt in the NVIC ** "System Driver" --> "User Application": Interrupt enabled ||| ||| == Register Callback == ||| ||| "User Application" -> "HAL EXTI Driver": **HAL_EXTI_RegisterTriggerCallback(&hexti, &user_cb)** note right: **Register the user defined callback**\n**function on rising edge trigger** "HAL EXTI Driver" --> "User Application": hal status: HAL_OK note left: **return** ||| ||| == Start the EXTI == ||| ||| "User Application" -> "HAL EXTI Driver": **HAL_EXTI_Enable(&hexti, HAL_EXTI_MODE_INTERRUPT)** note right: **Activate interrupt mode for**\n**the current EXTI ** "HAL EXTI Driver" --> "User Application": hal status: HAL_OK note left: **return** ||| ||| == Interrupt Service Routine == ||| ||| "EXTI_IRQHandler" <- : **Interrupt** note left: **Receive an interrupt signal** "EXTI_IRQHandler" --> "HAL EXTI Driver": "**HAL_EXTI_IRQHandler(&hexti)**" note left: **Call the IRQ Handler to manage upcoming interrupts** "HAL EXTI Driver" -> "User Application": "**p_rising_callback()**" @enduml$

Called functions:

HAL_GPIO_Init()

User application writing multiple GPIO pins in one shot ¶

$@startuml hide footbox skinparam ParticipantPadding 150 skinparam DefaultFontSize 26 skinparam ArrowFontSize 24 skinparam NoteFontSize 22 skinparam boxPadding 80 skinparam backgroundColor #FBFBFB skinparam DiagramBorderColor #black skinparam DiagramBorderThickness 2 skinparam Padding 6 scale 1600 Width !pragma teoz true ||| ||| == Initialization && Configuration== ||| ||| "User Application" -> "System Driver": **HAL_Init()** note right: **Configure System Clock** "System Driver" --> "User Application": hal status: HAL_OK note left: **return** group #LightBlue **#if defined (USE_HAL_GPIO_CLK_ENABLE_MODEL) && (USE_HAL_GPIO_CLK_ENABLE_MODEL == HAL_CLK_ENABLE_NO) ** ||| "User Application" -> "RCC": **Enable the current GPIO port Clock** ||| ||| end group "User Application" -> "HAL GPIO Driver": **HAL_GPIO_Init****(HAL_GPIOB**, **HAL_GPIO_PIN_2** \ \n\t\t\t\t\t\t | **HAL_GPIO_PIN_3** \ \n\t\t\t\t\t\t | **HAL_GPIO_PIN_5** \ \n\t\t\t\t\t\t | **HAL_GPIO_PIN_6** \ \n\t\t\t\t\t\t | **HAL_GPIO_PIN_14, &p_gpio_config)** note right: **Initialize the GPIO Pins to use**\n**in OUTPUT mode** "HAL GPIO Driver" --> "User Application": hal status: HAL_OK note left: **return** note right: **GPIO pins PB2, PB3, PB5, PB6 and PB14 initialized in OUTPUT mode successfully ** group #LightBlue **#if defined (USE_HAL_GPIO_CLK_ENABLE_MODEL) && (USE_HAL_GPIO_CLK_ENABLE_MODEL > HAL_CLK_ENABLE_NO) ** ||| "HAL GPIO Driver" -> "RCC": **Enable the current GPIO port Clock** ||| ||| end group ||| ||| == Process == ||| ||| "User Application" -> "HAL GPIO Driver": **HAL_GPIO_WriteMultipleStatePin****(HAL_GPIOB, HAL_GPIO_PIN_2** \ \n\t\t\t\t\t\t | **HAL_GPIO_PIN_3** \ \n\t\t\t\t\t\t | **HAL_GPIO_PIN_14,** \ \n\t\t\t\t\t\t **HAL_GPIO_PIN_5** \ \n\t\t\t\t\t\t | **HAL_GPIO_PIN_6)** note right: **Reset GPIO pin PB2**, **PB3 and PB14 and set GPIO pins PB5 and PB6** "HAL GPIO Driver" -> "STM32 Hardware": **Change the logical state of the pin PB2**, **PB3 and PB14 from HIGH to LOW and GPIO pins PB5 and PB6 from LOW to HIGH** ||| "User Application" -> "HAL GPIO Driver": **HAL_GPIO_ReadPin(HAL_GPIOB, HAL_GPIO_PIN_2)** note right: **Retrieve the actual state of the GPIO Pin PB2** "HAL GPIO Driver" <- "STM32 Hardware": **Read the logical state of the GPIO pin PB2 (either HIGH or LOW)** "User Application" <- "HAL GPIO Driver": **return the actual logical state of the GPIO Pin PB2** ||| "User Application" -> "HAL GPIO Driver": **HAL_GPIO_ReadPin(HAL_GPIOB, HAL_GPIO_PIN_3)** note right: **Retrieve the actual state of the GPIO Pin PB3** "HAL GPIO Driver" <- "STM32 Hardware": **Read the logical state of the GPIO pin PB3 (either HIGH or LOW)** "User Application" <- "HAL GPIO Driver": **return the actual logical state of the GPIO Pin PB3** "User Application" -> "HAL GPIO Driver": **HAL_GPIO_ReadPin(HAL_GPIOB, HAL_GPIO_PIN_5)** note right: **Retrieve the actual state of the GPIO Pin PB5** "HAL GPIO Driver" <- "STM32 Hardware": **Read the logical state of the GPIO pin PB5 (either HIGH or LOW)** "User Application" <- "HAL GPIO Driver": **return the actual logical state of the GPIO Pin PB5** ||| "User Application" -> "HAL GPIO Driver": **HAL_GPIO_ReadPin(HAL_GPIOB, HAL_GPIO_PIN_6)** note right: **Retrieve the actual state of the GPIO Pin PB6** "HAL GPIO Driver" <- "STM32 Hardware": **Read the logical state of the GPIO pin PB6 (either HIGH or LOW)** "User Application" <- "HAL GPIO Driver": **return the actual logical state of the GPIO Pin PB6** ||| "User Application" -> "HAL GPIO Driver": **HAL_GPIO_ReadPin(HAL_GPIOB, HAL_GPIO_PIN_14)** note right: **Retrieve the actual state of the GPIO Pin PB14** "HAL GPIO Driver" <- "STM32 Hardware": **Read the logical state of the GPIO pin PB14 (either HIGH or LOW)** "User Application" <- "HAL GPIO Driver": **return the actual logical state of the GPIO Pin PB14** @enduml$

Called functions: