/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file Examples_LL/HSEM/HSEM_DualProcess/Src/main.c
* @author MCD Application Team
* @brief This example describes how to use HSEM peripheral to lock and unlock
* hardware semaphore in the context of two process accessing the same
* semaphore using the STM32WLxx HSEM LL API.
* Peripheral initialization done using LL unitary services functions.
******************************************************************************
* @attention
*
* <h2><center>© Copyright (c) 2020 STMicroelectronics.
* All rights reserved.</center></h2>
*
* This software component is licensed by ST under BSD 3-Clause license,
* the "License"; You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
/* USER CODE BEGIN PFP */
void Configure_HSEM(void);
void LED_On(void);
void LED_Blinking(uint32_t Period);
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
uint32_t lockStatus = 0;
uint32_t currentProcess = 0;
uint32_t currentCore = 0;
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);
/* System interrupt init*/
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
/* USER CODE BEGIN 2 */
/* Configure HSEM */
Configure_HSEM();
/* PROCESS_A takes the semaphore with success */
lockStatus = LL_HSEM_2StepLock(HSEM, SEMAPHORE_ID, PROCESS_A);
if(lockStatus != 0)
{
LED_Blinking(LED_BLINK_ERROR);
}
/* PROCESS_B takes the semaphore and fail (as already taken by PROCESS_A) */
lockStatus = LL_HSEM_2StepLock(HSEM, SEMAPHORE_ID, PROCESS_B);
if(lockStatus != 1)
{
LED_Blinking(LED_BLINK_ERROR);
}
/* PROCESS_B releases the semaphore and fail (as owned by PROCESS_A) */
LL_HSEM_ReleaseLock(HSEM, SEMAPHORE_ID, PROCESS_B);
/* The status of the semaphore is observed using LL_HSEM_GetStatus */
lockStatus = LL_HSEM_GetStatus(HSEM, SEMAPHORE_ID);
if(lockStatus != 1)
{
LED_Blinking(LED_BLINK_ERROR);
}
/* The current process locking the semaphore is observed using LL_HSEM_GetProcessId */
currentProcess = LL_HSEM_GetProcessId(HSEM, SEMAPHORE_ID);
if(currentProcess != PROCESS_A)
{
LED_Blinking(LED_BLINK_ERROR);
}
/* In multicore environment, the current core locking the semaphore is observed using LL_HSEM_GetCoreId */
/* In this example, only one core is used and so only possible values are LL_HSEM_COREID_NONE or LL_HSEM_COREID_CPU1 */
currentCore = LL_HSEM_GetCoreId(HSEM, SEMAPHORE_ID);
if(currentCore != LL_HSEM_COREID_CPU1)
{
LED_Blinking(LED_BLINK_ERROR);
}
/* PROCESS_A releases the semaphore with success */
LL_HSEM_ReleaseLock(HSEM, SEMAPHORE_ID, PROCESS_A);
/* The status of the semaphore is observed using LL_HSEM_GetStatus */
lockStatus = LL_HSEM_GetStatus(HSEM, SEMAPHORE_ID);
if(lockStatus != 0)
{
LED_Blinking(LED_BLINK_ERROR);
}
LED_On();
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
LL_FLASH_SetLatency(LL_FLASH_LATENCY_2);
while(LL_FLASH_GetLatency() != LL_FLASH_LATENCY_2)
{
}
LL_PWR_SetRegulVoltageScaling(LL_PWR_REGU_VOLTAGE_SCALE1);
LL_RCC_MSI_Enable();
/* Wait till MSI is ready */
while(LL_RCC_MSI_IsReady() != 1)
{
}
LL_RCC_MSI_EnableRangeSelection();
LL_RCC_MSI_SetRange(LL_RCC_MSIRANGE_11);
LL_RCC_MSI_SetCalibTrimming(0);
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_MSI);
/* Wait till System clock is ready */
while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_MSI)
{
}
LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
LL_RCC_SetAHB3Prescaler(LL_RCC_SYSCLK_DIV_1);
LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
LL_Init1msTick(48000000);
/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
LL_SetSystemCoreClock(48000000);
}
/**
* @brief GPIO Initialization Function
* @param None
* @retval None
*/
static void MX_GPIO_Init(void)
{
LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
/* GPIO Ports Clock Enable */
LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOB);
/**/
LL_GPIO_ResetOutputPin(LED2_GPIO_Port, LED2_Pin);
/**/
GPIO_InitStruct.Pin = LED2_Pin;
GPIO_InitStruct.Mode = LL_GPIO_MODE_OUTPUT;
GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
LL_GPIO_Init(LED2_GPIO_Port, &GPIO_InitStruct);
}
/* USER CODE BEGIN 4 */
/**
* @brief This function configures HSEM Instance.
* @note This function is used to :
* - Enable peripheral clock for HSEM.
* @param None
* @retval None
*/
void Configure_HSEM(void)
{
/* Enable peripheral clock for RNG */
LL_AHB3_GRP1_EnableClock(LL_AHB3_GRP1_PERIPH_HSEM);
}
/**
* @brief Turn-on LED2.
* @param None
* @retval None
*/
void LED_On(void)
{
/* Turn LED2 on */
LL_GPIO_SetOutputPin(LED2_GPIO_Port, LED2_Pin);
}
/**
* @brief Set LED2 to Blinking mode for an infinite loop (toggle period based on value provided as input parameter).
* @param Period : Period of time (in ms) between each toggling of LED
* This parameter can be user defined values. Pre-defined values used in that example are :
* @arg LED_BLINK_FAST : Fast Blinking
* @arg LED_BLINK_SLOW : Slow Blinking
* @arg LED_BLINK_ERROR : Error specific Blinking
* @retval None
*/
void LED_Blinking(uint32_t Period)
{
/* Toggle LED2 in an infinite loop */
while (1)
{
LL_GPIO_TogglePin(LED2_GPIO_Port, LED2_Pin);
LL_mDelay(Period);
}
}
/* USER CODE END 4 */
/**
* @brief This function is executed in case of error occurrence.
* @retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
/* USER CODE END Error_Handler_Debug */
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* USER CODE BEGIN 6 */
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d", file, line) */
/* Infinite loop */
while (1)
{
}
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/