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/**
******************************************************************************
* @file Examples_LL/RNG/RNG_GenerateRandomNumbers_IT/Src/main.c
* @author MCD Application Team
* @brief This example describes how to use RNG peripheral for generating random
* numbers using the STM32F4xx RNG LL API.
* Peripheral initialization done using LL unitary services functions.
******************************************************************************
* @attention
*
* Copyright (c) 2017 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/** @addtogroup STM32F4xx_LL_Examples
* @{
*/
/** @addtogroup RNG_GenerateRandomNumbers_IT
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#if (USE_TIMEOUT == 1)
#define RNG_GENERATION_TIMEOUT 20
#endif /* USE_TIMEOUT */
#define NB_OF_GENERATED_RANDOM_NUMBERS 8 /* Nb of Random numbers generated after the User button press */
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
#if (USE_TIMEOUT == 1)
uint32_t Timeout = 0; /* Variable used for Timeout management */
#endif /* USE_TIMEOUT */
__IO uint8_t ubButtonPress = 0;
__IO uint8_t ubIndex = 0;
__IO uint8_t ubIsNbGenerated = 0;
/* Array used for storing generated Random 32bit Numbers */
__IO uint32_t aRandom32bit[NB_OF_GENERATED_RANDOM_NUMBERS];
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
void Configure_RNG(void);
void RandomNumbersGenerationIT(void);
void LED_Init(void);
void LED_On(void);
void LED_Blinking(uint32_t Period);
void UserButton_Init(void);
void WaitForUserButtonPress(void);
uint32_t SetSystemToHSI(void);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* Configure the system clock to 180 MHz */
SystemClock_Config();
/* Initialize LED1 */
LED_Init();
/* Initialize User push-button in EXTI mode */
UserButton_Init();
/* Configure RNG (RNG IP configuration : Clock enabling) */
Configure_RNG();
/* Wait for User push-button press to trigger random numbers generation */
WaitForUserButtonPress();
/* Generate Random Numbers series */
RandomNumbersGenerationIT();
/* Infinite loop */
while (1)
{
}
}
/**
* @brief This function configures RNG Instance.
* @note This function is used to :
* -1- Enable peripheral clock for RNG.
* -2- NVIC Configuration for RNG interrupts.
* @param None
* @retval None
*/
void Configure_RNG(void)
{
/* (1) Enable peripheral clock for RNG *********************/
LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_RNG);
/* Set system to HSI and disable PLL */
while (SetSystemToHSI()!= 0)
{
};
/* Configure PLLSAI to enable 48M domain
- Keep same PLLSAI source (HSE) and PLLM factor (DIV8) used for main PLL
- Select PLL_N & PLL_Q to have a frequency of 48MHz
* PLL_P output = (((HSE Freq / PLLM) * PLLSAI_N) / PLLSAI_P)
* = (((8000000 / 8 ) * 336 ) / 7 ) */
LL_RCC_PLL_ConfigDomain_48M(LL_RCC_PLLSOURCE_HSE, LL_RCC_PLLM_DIV_8, 336, LL_RCC_PLLQ_DIV_7);
/* set FLASH latency to 5 */
LL_FLASH_SetLatency(LL_FLASH_LATENCY_5);
/* Enable PLL*/
LL_RCC_PLL_Enable();
/* Wait for PLL ready flag */
while(LL_RCC_PLL_IsReady() != 1)
{
};
/* Sysclk activation on the main PLL */
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
while (LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
{
};
/* Set systick to 1ms */
SysTick_Config(168000000 / 1000);
/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
SystemCoreClock = 168000000;
/* (2) NVIC Configuration for RNG interrupts */
/* - Set priority for HASH_RNG_IRQn */
/* - Enable HASH_RNG_IRQn */
NVIC_SetPriority(HASH_RNG_IRQn, 0);
NVIC_EnableIRQ(HASH_RNG_IRQn);
}
/**
* @brief This function performs several random numbers generation.
* @note Generated random numbers are stored in global variable array, so that
* generated values could be observed by user by watching variable content
* in specific debugger window
* @param None
* @retval None
*/
void RandomNumbersGenerationIT(void)
{
/* Initialize random numbers generation */
LL_RNG_Enable(RNG);
/* Generate Random 32bit Numbers */
for(ubIndex = 0; ubIndex < NB_OF_GENERATED_RANDOM_NUMBERS; ubIndex++)
{
#if (USE_TIMEOUT == 1)
Timeout = RNG_GENERATION_TIMEOUT;
#endif /* USE_TIMEOUT */
ubIsNbGenerated = 0;
/* Enable RNG generation interrupt */
LL_RNG_EnableIT(RNG);
/* Wait for Random Number generation completion */
while (ubIsNbGenerated == 0)
{
#if (USE_TIMEOUT == 1)
/* Check Systick counter flag to decrement the time-out value */
if (LL_SYSTICK_IsActiveCounterFlag())
{
if(Timeout-- == 0)
{
/* Time-out occurred. Set LED to blinking mode */
LED_Blinking(LED_BLINK_SLOW);
}
}
#endif /* USE_TIMEOUT */
}
}
/* Stop random numbers generation */
LL_RNG_Disable(RNG);
/* Values of Generated Random numbers are now available in aRandom32bit array.
LED1 is turned on */
LED_On();
}
/**
* @brief Initialize LED1.
* @param None
* @retval None
*/
void LED_Init(void)
{
/* Enable the LED1 Clock */
LED1_GPIO_CLK_ENABLE();
/* Configure IO in output push-pull mode to drive external LED1 */
LL_GPIO_SetPinMode(LED1_GPIO_PORT, LED1_PIN, LL_GPIO_MODE_OUTPUT);
/* Reset value is LL_GPIO_OUTPUT_PUSHPULL */
//LL_GPIO_SetPinOutputType(LED1_GPIO_PORT, LED1_PIN, LL_GPIO_OUTPUT_PUSHPULL);
/* Reset value is LL_GPIO_SPEED_FREQ_LOW */
//LL_GPIO_SetPinSpeed(LED1_GPIO_PORT, LED1_PIN, LL_GPIO_SPEED_FREQ_LOW);
/* Reset value is LL_GPIO_PULL_NO */
//LL_GPIO_SetPinPull(LED1_GPIO_PORT, LED1_PIN, LL_GPIO_PULL_NO);
}
/**
* @brief Turn-on LED1.
* @param None
* @retval None
*/
void LED_On(void)
{
/* Turn LED1 on */
LL_GPIO_SetOutputPin(LED1_GPIO_PORT, LED1_PIN);
}
/**
* @brief Set LED1 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 LED1 in an infinite loop */
while (1)
{
LL_GPIO_TogglePin(LED1_GPIO_PORT, LED1_PIN);
LL_mDelay(Period);
}
}
/**
* @brief Configures User push-button in GPIO or EXTI Line Mode.
* @param None
* @retval None
*/
void UserButton_Init(void)
{
/* Enable the BUTTON Clock */
USER_BUTTON_GPIO_CLK_ENABLE();
/* Configure GPIO for BUTTON */
LL_GPIO_SetPinMode(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_MODE_INPUT);
LL_GPIO_SetPinPull(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_PULL_NO);
/* Connect External Line to the GPIO*/
USER_BUTTON_SYSCFG_SET_EXTI();
/* Enable a rising trigger EXTI_Line15_10 Interrupt */
USER_BUTTON_EXTI_LINE_ENABLE();
USER_BUTTON_EXTI_FALLING_TRIG_ENABLE();
/* Configure NVIC for USER_BUTTON_EXTI_IRQn */
NVIC_SetPriority(USER_BUTTON_EXTI_IRQn, 0x03);
NVIC_EnableIRQ(USER_BUTTON_EXTI_IRQn);
}
/**
* @brief Wait for User push-button press to start transfer.
* @param None
* @retval None
*/
/* */
void WaitForUserButtonPress(void)
{
while (ubButtonPress == 0)
{
LL_GPIO_TogglePin(LED1_GPIO_PORT, LED1_PIN);
LL_mDelay(LED_BLINK_FAST);
}
/* Turn LED1 off */
LL_GPIO_ResetOutputPin(LED1_GPIO_PORT, LED1_PIN);
}
/**
* @brief System Clock Configuration
* The system Clock is configured as follow :
* System Clock source = PLL (HSE)
* SYSCLK(Hz) = 180000000
* HCLK(Hz) = 180000000
* AHB Prescaler = 1
* APB1 Prescaler = 2
* APB2 Prescaler = 1
* HSE Frequency(Hz) = 8000000
* PLL_M = 8
* PLL_N = 360
* PLL_P = 2
* VDD(V) = 3.3
* Main regulator output voltage = Scale1 mode
* Flash Latency(WS) = 5
* @param None
* @retval None
*/
void SystemClock_Config(void)
{
/* Enable HSE oscillator */
LL_RCC_HSE_EnableBypass();
LL_RCC_HSE_Enable();
while(LL_RCC_HSE_IsReady() != 1)
{
};
/* Set FLASH latency */
LL_FLASH_SetLatency(LL_FLASH_LATENCY_5);
/* Enable PWR clock */
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_PWR);
/* Activation OverDrive Mode */
LL_PWR_EnableOverDriveMode();
while(LL_PWR_IsActiveFlag_OD() != 1)
{
};
/* Activation OverDrive Switching */
LL_PWR_EnableOverDriveSwitching();
while(LL_PWR_IsActiveFlag_ODSW() != 1)
{
};
/* Main PLL configuration and activation */
LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE, LL_RCC_PLLM_DIV_8, 360, LL_RCC_PLLP_DIV_2);
LL_RCC_PLL_Enable();
while(LL_RCC_PLL_IsReady() != 1)
{
};
/* Sysclk activation on the main PLL */
LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
{
};
/* Set APB1 & APB2 prescaler */
LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_2);
LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
/* Set systick to 1ms */
SysTick_Config(180000000 / 1000);
/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
SystemCoreClock = 180000000;
}
uint32_t SetSystemToHSI(void)
{
uint32_t timeout = 0;
/* Enable HSI if not enabled */
if (LL_RCC_HSI_IsReady() != 1)
{
LL_RCC_HSI_Enable();
timeout = 1000;
while ((LL_RCC_HSI_IsReady() != 1) && (timeout != 0))
{
if (SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk)
{
timeout --;
}
if (timeout == 0)
{
return 1;
}
}
}
/* Set SYS clock source to HSI */
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_HSI);
LL_FLASH_SetLatency(LL_FLASH_LATENCY_0);
SystemCoreClock = HSI_VALUE;
/* Disable PLL if enabled */
if (LL_RCC_PLL_IsReady() != 0)
{
LL_RCC_PLL_Disable();
timeout = 1000;
while ((LL_RCC_PLL_IsReady() != 0) && (timeout != 0))
{
if (SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk)
{
timeout --;
}
if (timeout == 0)
{
return 1;
}
}
}
/* Test end */
return 0;
}
/******************************************************************************/
/* IRQ HANDLER TREATMENT Functions */
/******************************************************************************/
/**
* @brief Function called when RNG IT is triggered with DRDY flag set
* @param None
* @retval None
*/
void RNG_DataReady_Callback(void)
{
/* Disable RNG IT generation */
LL_RNG_DisableIT(RNG);
/* Value of generated random number could be retrieved and stored in dedicated array */
aRandom32bit[ubIndex] = LL_RNG_ReadRandData32(RNG);
/* Set Flag indicated random Number generation is completed */
ubIsNbGenerated = 1;
}
/**
* @brief Function called in case of error detected in RNG IT Handler
* @param None
* @retval None
*/
void Error_Callback(void)
{
/* Disable HASH_RNG_IRQn */
NVIC_DisableIRQ(HASH_RNG_IRQn);
/* Clock or Seed Error detected. Set LED to blinking mode (Error type)*/
LED_Blinking(LED_BLINK_ERROR);
}
/**
* @brief Function to manage User push-button
* @param None
* @retval None
*/
void UserButton_Callback(void)
{
/* Update User push-button variable : to be checked in waiting loop in main program */
ubButtonPress = 1;
}
#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 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)
{
}
}
#endif
/**
* @}
*/
/**
* @}
*/