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STM32F0xx Standard Peripherals Firmware Library
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STM32F0xx_StdPeriph_Examples/USART/USART_8xUsartsOneBoard/main.c
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00001 /** 00002 ****************************************************************************** 00003 * @file USART/USART_8xUsartsOneBoard/main.c 00004 * @author MCD Application Team 00005 * @version V1.4.0 00006 * @date 24-July-2014 00007 * @brief Main program body 00008 ****************************************************************************** 00009 * @attention 00010 * 00011 * <h2><center>© COPYRIGHT 2014 STMicroelectronics</center></h2> 00012 * 00013 * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License"); 00014 * You may not use this file except in compliance with the License. 00015 * You may obtain a copy of the License at: 00016 * 00017 * http://www.st.com/software_license_agreement_liberty_v2 00018 * 00019 * Unless required by applicable law or agreed to in writing, software 00020 * distributed under the License is distributed on an "AS IS" BASIS, 00021 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00022 * See the License for the specific language governing permissions and 00023 * limitations under the License. 00024 * 00025 ****************************************************************************** 00026 */ 00027 00028 /* Includes ------------------------------------------------------------------*/ 00029 #include "main.h" 00030 00031 /** @addtogroup STM32F0xx_StdPeriph_Examples 00032 * @{ 00033 */ 00034 00035 /** @addtogroup USART_8xUsartsOneBoard 00036 * @{ 00037 */ 00038 00039 /* Private typedef -----------------------------------------------------------*/ 00040 /* Private define ------------------------------------------------------------*/ 00041 /* Private macro -------------------------------------------------------------*/ 00042 /* Private variables ---------------------------------------------------------*/ 00043 static __IO uint32_t TimingDelay; 00044 00045 /* Buffer used for transmission */ 00046 uint8_t aTxBuffer[BUFFER_SIZE] = "USART Example: 8xUsarts Tx/Rx Communication"; 00047 uint8_t aRxBuffer[USART_MAX_INDEX][BUFFER_SIZE]; 00048 /* Buffer used for reception */ 00049 USART_InitTypeDef USART_InitStructure; 00050 __IO uint8_t TxCounter = 0; 00051 extern __IO uint8_t ReceiveState; 00052 USART_TypeDef* UsartInstance[USART_MAX_INDEX] = {USART1, USART2, USART3, USART4, USART5, USART6, USART7, USART8}; 00053 uint8_t UsartIndex = 0; 00054 /* Private function prototypes -----------------------------------------------*/ 00055 static uint16_t Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength); 00056 static void RCC_Configuration(void); 00057 static void GPIO_Configuration(void); 00058 static void NVIC_Configuration(void); 00059 static void Delay(__IO uint32_t nTime); 00060 00061 /* Private functions ---------------------------------------------------------*/ 00062 00063 /** 00064 * @brief Main program. 00065 * @param None 00066 * @retval None 00067 */ 00068 int main(void) 00069 { 00070 uint8_t *buffptr; 00071 00072 /*!< At this stage the microcontroller clock setting is already configured, 00073 this is done through SystemInit() function which is called from startup 00074 file (startup_stm32f0xx.s) before to branch to application main. 00075 To reconfigure the default setting of SystemInit() function, refer to 00076 system_stm32f0xx.c file 00077 */ 00078 if (SysTick_Config(SystemCoreClock / 1000)) 00079 { 00080 /* error */ 00081 while (1); 00082 } 00083 /* Configure clock GPIO, USARTs */ 00084 RCC_Configuration(); 00085 00086 /* Configure GPIO Pin Tx/Rx for Usart communication */ 00087 GPIO_Configuration(); 00088 00089 /* Configure NVIC */ 00090 NVIC_Configuration(); 00091 00092 /* 8xUSARTs configuration --------------------------------------------------*/ 00093 /* 8xUSARTs configured as follow: 00094 - BaudRate = 9600 baud 00095 - Word Length = 8 Bits 00096 - One Stop Bit 00097 - No parity 00098 - Hardware flow control disabled (RTS and CTS signals) 00099 - Receive and transmit enabled 00100 */ 00101 USART_InitStructure.USART_BaudRate = 9600; 00102 USART_InitStructure.USART_WordLength = USART_WordLength_8b; 00103 USART_InitStructure.USART_StopBits = USART_StopBits_1; 00104 USART_InitStructure.USART_Parity = USART_Parity_No; 00105 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; 00106 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; 00107 00108 /* Prepare all uart to receive a data packet */ 00109 for(UsartIndex = 0; UsartIndex < USART_MAX_INDEX; UsartIndex++) 00110 { 00111 USART_Init(UsartInstance[UsartIndex], &USART_InitStructure); 00112 00113 /* Enable 8xUSARTs Receive interrupts */ 00114 USART_ITConfig(UsartInstance[UsartIndex], USART_IT_RXNE, ENABLE); 00115 00116 /* Enable the 8xUSARTs */ 00117 USART_Cmd(UsartInstance[UsartIndex], ENABLE); 00118 } 00119 00120 /* Infinite Loop */ 00121 while(1) 00122 { 00123 /* Set aRxBuffer to 0 */ 00124 memset(aRxBuffer, 0x0, BUFFER_SIZE * USART_MAX_INDEX); 00125 00126 /* When data has been transferred start the next transfer */ 00127 for(UsartIndex = 0; UsartIndex < USART_MAX_INDEX; UsartIndex++) 00128 { 00129 /* Initialize the global variable to handle the data transfer */ 00130 TxCounter = 0; 00131 ReceiveState = 0; 00132 00133 /* Delay to let time to see counter incrementation on the screen */ 00134 Delay(2000); 00135 /* Set the data buffptr to use for the transfer */ 00136 if (UsartIndex == 0) 00137 { 00138 buffptr = aTxBuffer; 00139 } 00140 else 00141 { 00142 buffptr = aRxBuffer[UsartIndex]; 00143 } 00144 00145 while(TxCounter < BUFFER_SIZE) 00146 { 00147 /* Send one byte from USART1 to USARTx */ 00148 USART_SendData(UsartInstance[UsartIndex], buffptr[TxCounter++]); 00149 00150 /* Loop until USART1 DR register is empty */ 00151 while(USART_GetFlagStatus(UsartInstance[UsartIndex], USART_FLAG_TXE) == RESET) 00152 {} 00153 } 00154 00155 while(ReceiveState == 0); 00156 /* Compares two buffers */ 00157 if(UsartIndex == (USART_MAX_INDEX - 1)) 00158 { 00159 if( Buffercmp((uint8_t*) aRxBuffer[0], (uint8_t*) aTxBuffer, BUFFER_SIZE)) 00160 { 00161 /* Error */ 00162 while(1); 00163 } 00164 } 00165 else 00166 { 00167 if( Buffercmp((uint8_t*) aRxBuffer[UsartIndex+1], (uint8_t*) aTxBuffer, BUFFER_SIZE)) 00168 { 00169 /* Error */ 00170 while(1); 00171 } 00172 } 00173 ReceiveState = 0; 00174 } 00175 /* Insert delay */ 00176 Delay(2000); 00177 } 00178 } 00179 00180 /** 00181 * @brief Decrements the TimingDelay variable. 00182 * @param None 00183 * @retval None 00184 */ 00185 void TimingDelay_Decrement(void) 00186 { 00187 if (TimingDelay != 0x00) 00188 { 00189 TimingDelay--; 00190 } 00191 } 00192 00193 /** 00194 * @brief Configures the different system clocks. 00195 * @param None 00196 * @retval None 00197 */ 00198 static void RCC_Configuration(void) 00199 { 00200 /* Enable GPIO clock */ 00201 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA|RCC_AHBPeriph_GPIOB|RCC_AHBPeriph_GPIOC|RCC_AHBPeriph_GPIOD|RCC_AHBPeriph_GPIOF, ENABLE); 00202 00203 /* Enable 8xUSARTs Clock */ 00204 RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2|RCC_APB1Periph_USART3|RCC_APB1Periph_USART4|RCC_APB1Periph_USART5, ENABLE); 00205 00206 RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART6|RCC_APB2Periph_USART7|RCC_APB2Periph_USART8|RCC_APB2Periph_USART1, ENABLE); 00207 } 00208 00209 /** 00210 * @brief Configures the different GPIO ports. 00211 * @param None 00212 * @retval None 00213 */ 00214 static void GPIO_Configuration(void) 00215 { 00216 GPIO_InitTypeDef GPIO_InitStructure; 00217 00218 /* USART1 Pins configuration ************************************************/ 00219 /* Connect pin to Periph */ 00220 GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_1); 00221 GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_1); 00222 00223 /* Configure pins as AF pushpull */ 00224 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10; 00225 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; 00226 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 00227 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; 00228 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; 00229 GPIO_Init(GPIOA, &GPIO_InitStructure); 00230 00231 /* USART2 Pins configuration ************************************************/ 00232 /* Connect pin to Periph */ 00233 GPIO_PinAFConfig(GPIOD, GPIO_PinSource6, GPIO_AF_0); 00234 GPIO_PinAFConfig(GPIOD, GPIO_PinSource5, GPIO_AF_0); 00235 00236 /* Configure pins as AF pushpull */ 00237 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6; 00238 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; 00239 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 00240 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; 00241 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; 00242 GPIO_Init(GPIOD, &GPIO_InitStructure); 00243 00244 /* USART3 Pins configuration ***********************************************/ 00245 /* Connect pin to Periph */ 00246 GPIO_PinAFConfig(GPIOD, GPIO_PinSource8, GPIO_AF_0); 00247 GPIO_PinAFConfig(GPIOD, GPIO_PinSource9, GPIO_AF_0); 00248 00249 /* Configure pins as AF pushpull */ 00250 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9; 00251 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; 00252 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 00253 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; 00254 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; 00255 GPIO_Init(GPIOD, &GPIO_InitStructure); 00256 00257 /* USART4 Pins configuration ***********************************************/ 00258 /* Connect pin to Periph */ 00259 GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_0); 00260 GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_0); 00261 00262 /* Configure pins as AF pushpull */ 00263 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11; 00264 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; 00265 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 00266 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; 00267 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; 00268 GPIO_Init(GPIOC, &GPIO_InitStructure); 00269 00270 /* USART5 Pins configuration*************************************************/ 00271 /* Connect pin to Periph */ 00272 GPIO_PinAFConfig(GPIOB, GPIO_PinSource3, GPIO_AF_4); 00273 GPIO_PinAFConfig(GPIOB, GPIO_PinSource4, GPIO_AF_4); 00274 00275 /* Configure pins as AF pushpull */ 00276 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4; 00277 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; 00278 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 00279 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; 00280 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; 00281 GPIO_Init(GPIOB, &GPIO_InitStructure); 00282 00283 /* USART6 Pins configuration*************************************************/ 00284 /* Connect pin to Periph */ 00285 GPIO_PinAFConfig(GPIOF, GPIO_PinSource9, GPIO_AF_1); 00286 GPIO_PinAFConfig(GPIOF, GPIO_PinSource10, GPIO_AF_1); 00287 00288 /* Configure pins as AF pushpull */ 00289 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_9; 00290 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; 00291 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 00292 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; 00293 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; 00294 GPIO_Init(GPIOF, &GPIO_InitStructure); 00295 00296 /* USART7 Pins configuration *************************************************/ 00297 /* Connect pin to Periph */ 00298 GPIO_PinAFConfig(GPIOF, GPIO_PinSource2, GPIO_AF_1); 00299 GPIO_PinAFConfig(GPIOF, GPIO_PinSource3, GPIO_AF_1); 00300 00301 /* Configure pins as AF pushpull */ 00302 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3; 00303 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; 00304 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 00305 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; 00306 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; 00307 GPIO_Init(GPIOF, &GPIO_InitStructure); 00308 00309 /* USART8 Pins configuration *************************************************/ 00310 /* Connect pin to Periph */ 00311 GPIO_PinAFConfig(GPIOC, GPIO_PinSource8, GPIO_AF_1); 00312 GPIO_PinAFConfig(GPIOC, GPIO_PinSource9, GPIO_AF_1); 00313 00314 /* Configure pins as AF pushpull */ 00315 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9; 00316 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; 00317 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 00318 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; 00319 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; 00320 GPIO_Init(GPIOC, &GPIO_InitStructure); 00321 } 00322 00323 /** 00324 * @brief Configures the nested vectored interrupt controller. 00325 * @param None 00326 * @retval None 00327 */ 00328 static void NVIC_Configuration(void) 00329 { 00330 NVIC_InitTypeDef NVIC_InitStructure; 00331 00332 /* USART1 IRQ Channel configuration */ 00333 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; 00334 NVIC_InitStructure.NVIC_IRQChannelPriority = 0x01; 00335 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 00336 NVIC_Init(&NVIC_InitStructure); 00337 00338 /* USART2 IRQ Channel configuration */ 00339 NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn; 00340 NVIC_InitStructure.NVIC_IRQChannelPriority = 0x01; 00341 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 00342 NVIC_Init(&NVIC_InitStructure); 00343 00344 /* USART3_8 IRQ Channel configuration */ 00345 NVIC_InitStructure.NVIC_IRQChannel = USART3_8_IRQn; 00346 NVIC_InitStructure.NVIC_IRQChannelPriority = 0x01; 00347 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 00348 NVIC_Init(&NVIC_InitStructure); 00349 } 00350 00351 /** 00352 * @brief Inserts a delay time. 00353 * @param nTime: specifies the delay time length, in milliseconds. 00354 * @retval None 00355 */ 00356 static void Delay(__IO uint32_t nTime) 00357 { 00358 TimingDelay = nTime; 00359 00360 while(TimingDelay != 0); 00361 } 00362 00363 /** 00364 * @brief Compares two buffers. 00365 * @param pBuffer1, pBuffer2: buffers to be compared. 00366 * @param BufferLength: buffer's length 00367 * @retval 0 : pBuffer1 identical to pBuffer2 00368 * >0 : pBuffer1 differs from pBuffer2 00369 */ 00370 static uint16_t Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength) 00371 { 00372 while (BufferLength--) 00373 { 00374 if ((*pBuffer1) != *pBuffer2) 00375 { 00376 return BufferLength; 00377 } 00378 pBuffer1++; 00379 pBuffer2++; 00380 } 00381 00382 return 0; 00383 } 00384 00385 #ifdef USE_FULL_ASSERT 00386 00387 /** 00388 * @brief Reports the name of the source file and the source line number 00389 * where the assert_param error has occurred. 00390 * @param file: pointer to the source file name 00391 * @param line: assert_param error line source number 00392 * @retval None 00393 */ 00394 void assert_failed(uint8_t* file, uint32_t line) 00395 { 00396 /* User can add his own implementation to report the file name and line number, 00397 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ 00398 00399 /* Infinite loop */ 00400 while (1) 00401 { 00402 } 00403 } 00404 #endif 00405 00406 /** 00407 * @} 00408 */ 00409 00410 /** 00411 * @} 00412 */ 00413 00414 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/