Src/main.c (RCC_ClockConfig)

Outline

Includes

#include "main.h"

Private variables

RCC_ClkInitStruct

RCC_OscInitStruct

Private function prototypes

main()

HAL_GPIO_EXTI_Callback(uint16_t)

SystemClockHSE_Config()

SystemClockHSI_Config()

Error_Handler()

Files

SourceVuSTM32 Libraries and SamplesRCC_ClockConfigSrc/main.c

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

/** ****************************************************************************** * @file RCC/RCC_ClockConfig/Src/main.c * @author MCD Application Team * @brief This example describes how to use the RCC HAL API to configure the * system clock (SYSCLK) and modify the clock settings on run time. ****************************************************************************** * @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_HAL_Examples * @{ */ /** @addtogroup RCC_ClockConfig * @{ */ /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ static RCC_ClkInitTypeDef RCC_ClkInitStruct; static RCC_OscInitTypeDef RCC_OscInitStruct; /* Private function prototypes -----------------------------------------------*/ static void SystemClockHSI_Config(void); static void SystemClockHSE_Config(void); static void Error_Handler(void); /* Private functions ---------------------------------------------------------*/ /** * @brief Main program * @param None * @retval None */ int main(void) { /* STM32F4xx HAL library initialization: - Configure the Flash prefetch, instruction and Data caches - Configure the Systick to generate an interrupt each 1 msec - Set NVIC Group Priority to 4 - Global MSP (MCU Support Package) initialization */ HAL_Init(); /* Configure LED1, LED2, LED3 and LED4 */ BSP_LED_Init(LED1); BSP_LED_Init(LED2); BSP_LED_Init(LED3); BSP_LED_Init(LED4); /* Configure Key Button, used to trigger an interrupt each time it's pressed. In the ISR the PLL source will be changed from HSE to HSI, and vice versa. */ BSP_PB_Init(BUTTON_KEY, BUTTON_MODE_EXTI); /* Enable Power Control clock */ __HAL_RCC_PWR_CLK_ENABLE(); /* The voltage scaling allows optimizing the power consumption when the device is clocked below the maximum system frequency, to update the voltage scaling value regarding system frequency refer to product datasheet. */ __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1); /* Enable HSE oscillator and configure the PLL to reach the max system frequency (180MHz) when using HSE oscillator as PLL clock source. */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE; RCC_OscInitStruct.HSEState = RCC_HSE_ON; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; RCC_OscInitStruct.PLL.PLLM = 25; RCC_OscInitStruct.PLL.PLLN = 360; RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; RCC_OscInitStruct.PLL.PLLQ = 7; if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { /* Initialization Error */ Error_Handler(); } /* Activate the Over Drive feature (available only for STM32F42xxx/43xxx devices)*/ if(HAL_PWREx_EnableOverDrive() != HAL_OK) { /* Initialization Error */ Error_Handler(); } /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers. The SysTick 1 msec interrupt is required for the HAL process (Timeout management); by default the configuration is done using the HAL_Init() API, and when the system clock configuration is updated the SysTick configuration will be adjusted by the HAL_RCC_ClockConfig() API. */ RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2); RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK) { /* Initialization Error */ Error_Handler(); } /* Output SYSCLK divided by 2 on MCO2 pin(PC9) */ HAL_RCC_MCOConfig(RCC_MCO2, RCC_MCO2SOURCE_SYSCLK, RCC_MCODIV_2); /* Toggle some LEDs in an infinite loop */ while (1) { /* Toggle LED1 */ BSP_LED_Toggle(LED1); HAL_Delay(100); /* Toggle LED2 */ BSP_LED_Toggle(LED2); HAL_Delay(100); /* Toggle LED4 */ BSP_LED_Toggle(LED4); HAL_Delay(100); } } /** * @brief EXTI line detection callbacks. * @param GPIO_Pin: Specifies the pins connected EXTI line * @retval None */ void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin) { if(GPIO_Pin == KEY_BUTTON_PIN) { if(__HAL_RCC_GET_PLL_OSCSOURCE() == RCC_PLLCFGR_PLLSRC_HSI) { /* Set SYSCLK frequency to 180 MHz, coming from the PLL which is clocked by the HSE */ SystemClockHSE_Config(); } else /* PLL source is HSE oscillator */ { /* Set SYSCLK frequency to 180 MHz, coming from the PLL which is clocked by the HSI */ SystemClockHSI_Config(); } } } /** * @brief Switch the PLL source from HSI to HSE, and select the PLL as SYSCLK * source. * The system Clock is configured as follow : * System Clock source = PLL (HSE) * SYSCLK(Hz) = 180000000 * HCLK(Hz) = 180000000 * AHB Prescaler = 1 * APB1 Prescaler = 4 * APB2 Prescaler = 2 * HSE Frequency(Hz) = 25000000 * PLL_M = 25 * PLL_N = 360 * PLL_P = 2 * PLL_Q = 7 * VDD(V) = 3.3 * Main regulator output voltage = Scale1 mode * Flash Latency(WS) = 5 * @param None * @retval None */ void SystemClockHSE_Config(void) { /* -1- Select HSI as system clock source to allow modification of the PLL configuration */ RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK; RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI; if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK) { Error_Handler(); } /* -2- Enable HSE Oscillator, select it as PLL source and finally activate the PLL */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE; RCC_OscInitStruct.HSEState = RCC_HSE_ON; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; RCC_OscInitStruct.PLL.PLLM = 25; RCC_OscInitStruct.PLL.PLLN = 360; RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; RCC_OscInitStruct.PLL.PLLQ = 7; if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { /* Initialization Error */ Error_Handler(); } /* -3- Activate the Over Drive feature to reach 180 MHz as system clock frequency (this feature is only available for STM32F42xxx/43xxx devices) */ if(HAL_PWREx_EnableOverDrive() != HAL_OK) { /* Initialization Error */ Error_Handler(); } /* -4- Select the PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */ RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2); RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK) { Error_Handler(); } /* -5- Optional: Disable HSI Oscillator (if the HSI is no more needed by the application)*/ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI; RCC_OscInitStruct.HSIState = RCC_HSI_OFF; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { /* Initialization Error */ Error_Handler(); } } /** * @brief Switch the PLL source from HSI to HSE, and select the PLL as SYSCLK * source. * The system Clock is configured as follow : * System Clock source = PLL (HSI) * SYSCLK(Hz) = 180000000 * HCLK(Hz) = 180000000 * AHB Prescaler = 1 * APB1 Prescaler = 4 * APB2 Prescaler = 2 * HSI Frequency(Hz) = 16000000 * PLL_M = 16 * 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 SystemClockHSI_Config(void) { /* -1- Select HSE as system clock source to allow modification of the PLL configuration */ RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK; RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSE; if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK) { Error_Handler(); } /* -2- Enable HSI Oscillator, select it as PLL source and finally activate the PLL */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI; RCC_OscInitStruct.HSIState = RCC_HSI_ON; RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI; RCC_OscInitStruct.PLL.PLLM = 16; RCC_OscInitStruct.PLL.PLLN = 360; RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { /* Initialization Error */ Error_Handler(); } /* -3- Activate the Over Drive feature to reach 180 MHz as system clock frequency (this feature is only available for STM32F42xxx/43xxx devices) */ if(HAL_PWREx_EnableOverDrive() != HAL_OK) { /* Initialization Error */ Error_Handler(); } /* -4- Select the PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */ RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2); RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK) { Error_Handler(); } /* -5- Optional: Disable HSE Oscillator (if the HSE is no more needed by the application) */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE; RCC_OscInitStruct.HSEState = RCC_HSE_OFF; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { /* Initialization Error */ Error_Handler(); } } /** * @brief This function is executed in case of error occurrence. * @param None * @retval None */ static void Error_Handler(void) { /* Turn LED3 on */ BSP_LED_On(LED3); while(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\r\n", file, line) */ /* Infinite loop */ while (1) { } } #endif /** * @} */ /** * @} */

Details