Src/main.c (WWDG_RefreshUntilUserEvent)

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

/** ****************************************************************************** * @file Examples_LL/WWDG/WWDG_RefreshUntilUserEvent/Src/main.c * @author MCD Application Team * @brief This example describes how to configure WWDG down-counter (with Window) * using the STM32F4xx WWDG 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 WWDG_RefreshUntilUserEvent * @{ */ /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ static __IO uint8_t KeyPressed = 0; /* Private function prototypes -----------------------------------------------*/ void SystemClock_Config(void); void Check_WWDG_Reset(void); void Configure_WWDG(void); void LED_Init(void); void LED_On(void); void UserButton_Init(void); /* Private functions ---------------------------------------------------------*/ /** * @brief Main program * @param None * @retval None */ int main(void) { /* Configure the system clock to 2MHz */ SystemClock_Config(); /* Initialize LED2 */ LED_Init(); /* Initialize button in EXTI mode */ UserButton_Init(); /* Check if the system has resumed from WWDG reset*/ Check_WWDG_Reset(); /* Configure the WWDG */ /* - Configure the Window to ~2s */ /* - Configure the Prescaler */ /* - Configure the Downcounter to ~2s */ /* - Enable the WWDG */ Configure_WWDG(); /* Infinite loop */ while (1) { if (1 != KeyPressed) { /* Refresh WWDG Downcounter to initial value ~2s*/ LL_WWDG_SetCounter(WWDG, 0X7E); LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN); LL_mDelay(LED_BLINK_FAST); } } } /** * @brief This function configures WWDG * @param None * @retval None */ void Configure_WWDG(void) { /* Enable the peripheral clock of DBG register (uncomment for debug purpose) */ /*LL_DBGMCU_APB1_GRP1_FreezePeriph(LL_DBGMCU_APB1_GRP1_WWDG_STOP); */ /* Enable the peripheral clock WWDG */ LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_WWDG); /* Configure WWDG */ /* (1) set prescaler to have a rollover each about ~2s */ /* (2) set window value to same value (~2s) as downcounter in order to ba able to refresh the WWDG almost immediately */ /* (3) Refresh WWDG before activate it */ /* (4) Activate WWDG */ LL_WWDG_SetPrescaler(WWDG, LL_WWDG_PRESCALER_8); /* (1) */ LL_WWDG_SetWindow(WWDG,0x7E); /* (2) */ LL_WWDG_SetCounter(WWDG, 0X7E); /* (3) */ LL_WWDG_Enable(WWDG); /* (4) */ } /** * @brief This function check if the system has resumed from WWDG reset * @param None * @retval None */ void Check_WWDG_Reset(void) { if (LL_RCC_IsActiveFlag_WWDGRST()) { /* clear WWDG reset flag */ LL_RCC_ClearResetFlags(); /* turn Led on and wait for user event to perform example again */ LED_On(); while(KeyPressed != 1) { } /* Reset KeyPressed value */ KeyPressed = 0; } } /** * @brief Initialize LED2. * @param None * @retval None */ void LED_Init(void) { /* Enable the LED2 Clock */ LED2_GPIO_CLK_ENABLE(); /* Configure IO in output push-pull mode to drive external LED2 */ LL_GPIO_SetPinMode(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_MODE_OUTPUT); /* Reset value is LL_GPIO_OUTPUT_PUSHPULL */ //LL_GPIO_SetPinOutputType(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_OUTPUT_PUSHPULL); /* Reset value is LL_GPIO_SPEED_FREQ_LOW */ //LL_GPIO_SetPinSpeed(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_SPEED_FREQ_LOW); /* Reset value is LL_GPIO_PULL_NO */ //LL_GPIO_SetPinPull(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_PULL_NO); } /** * @brief Turn-on LED2. * @param None * @retval None */ void LED_On(void) { /* Turn LED2 on */ LL_GPIO_SetOutputPin(LED2_GPIO_PORT, LED2_PIN); } /** * @brief Configures User push-button in 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 line 13 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 System Clock Configuration * The system Clock is configured as follow : * System Clock source = HSE * SYSCLK(Hz) = 8000000 * HCLK(Hz) = 2000000 * AHB Prescaler = 4 * APB1 Prescaler = 1 * APB2 Prescaler = 1 * HSE Frequency(Hz) = 8000000 * VDD(V) = 3.3 * Main regulator output voltage = Scale1 mode * Flash Latency(WS) = 0 * @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_0); /* Sysclk activation on the main PLL */ LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_4); LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_HSE); while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_HSE) { }; /* Set APB1 & APB2 prescaler */ LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1); LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1); /* Set systick to 1ms */ SysTick_Config(2000000 / 1000); /* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */ SystemCoreClock = 2000000; } /******************************************************************************/ /* USER IRQ HANDLER TREATMENT */ /******************************************************************************/ /** * @brief Function to manage IRQ Handler * @param None * @retval None */ void UserButton_Callback(void) { KeyPressed = 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 /** * @} */ /** * @} */