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STM32F0xx Standard Peripherals Firmware Library
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STM32F0xx_StdPeriph_Examples/CRC/CRC_TwoBoards/main.c
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00001 /** 00002 ****************************************************************************** 00003 * @file CRC/CRC_TwoBoards/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 00029 /* Includes ------------------------------------------------------------------*/ 00030 #include "main.h" 00031 00032 /** @addtogroup CRC_TwoBoards 00033 * @{ 00034 */ 00035 00036 /* Private typedef -----------------------------------------------------------*/ 00037 /* Private define ------------------------------------------------------------*/ 00038 /* Private macro -------------------------------------------------------------*/ 00039 /* Private variables ---------------------------------------------------------*/ 00040 uint8_t TxBuffer[] = "USART Interrupt Example: Communication between two USART using Interrupt"; 00041 uint8_t RxBuffer [RXBUFFERSIZE]; 00042 00043 __IO JOYState_TypeDef PressedButton = JOY_NONE; 00044 __IO uint8_t RxIndex = 0x00; 00045 __IO uint8_t TxIndex = 0x00; 00046 00047 /* Private function prototypes -----------------------------------------------*/ 00048 static void USART_Config(void); 00049 static void SysTickConfig(void); 00050 static void CRC_Config(uint8_t poly); 00051 00052 /* Private functions ---------------------------------------------------------*/ 00053 00054 /** 00055 * @brief Main program. 00056 * @param None 00057 * @retval None 00058 */ 00059 int main(void) 00060 { 00061 /*!< At this stage the microcontrollers clock setting is already configured, 00062 this is done through SystemInit() function which is called from startup 00063 file (startup_stm32f30x.s) before to branch to application main. 00064 To reconfigure the default setting of SystemInit() function, refer to 00065 system_stm32f30x.c file 00066 */ 00067 00068 /* USART configuration -----------------------------------------------------*/ 00069 USART_Config(); 00070 00071 /* SysTick configuration ---------------------------------------------------*/ 00072 SysTickConfig(); 00073 00074 /* Initialize LEDs mounted on STM32303C-EVAL board */ 00075 STM_EVAL_LEDInit(LED1); 00076 STM_EVAL_LEDInit(LED2); 00077 STM_EVAL_LEDInit(LED3); 00078 00079 /* Configure the CRC peripheral to use the polynomial x8 + x7 + x6 + x4 + x2 + 1 */ 00080 CRC_Config(0xD5); 00081 00082 #ifdef MODE_TRANSMITTER 00083 /* ------------------ USART in mode Tramitter ------------------------------*/ 00084 00085 /* Configure the external interrupt "Joystick SEL" button */ 00086 STM_EVAL_PBInit(BUTTON_SEL, BUTTON_MODE_EXTI); 00087 00088 /* Forever loop */ 00089 while (1) 00090 { 00091 00092 /*Wait "JOY_SEL" to start data transfer */ 00093 if ((PressedButton != JOY_NONE)) 00094 { 00095 /* Enable the USARTx transmit data register empty interrupt */ 00096 USART_ITConfig(USARTx, USART_IT_TXE, ENABLE); 00097 /* Set PressedButton to default value */ 00098 PressedButton = JOY_NONE; 00099 } 00100 } 00101 #else 00102 /* ------------------ USART in mode Receiver -------------------------------*/ 00103 /* Enable the USARTx receive data register not empty interrupt */ 00104 USART_ITConfig(USARTx, USART_IT_RXNE, ENABLE); 00105 00106 /* Infinite loop */ 00107 while(1) 00108 { 00109 } 00110 00111 #endif /* MODE_TRANSMITTER */ 00112 } 00113 00114 /** 00115 * @brief Configures the USART Peripheral. 00116 * @param None 00117 * @retval None 00118 */ 00119 static void USART_Config(void) 00120 { 00121 USART_InitTypeDef USART_InitStructure; 00122 NVIC_InitTypeDef NVIC_InitStructure; 00123 GPIO_InitTypeDef GPIO_InitStructure; 00124 00125 /* Enable GPIO clock */ 00126 RCC_AHBPeriphClockCmd(USARTx_TX_GPIO_CLK | USARTx_RX_GPIO_CLK, ENABLE); 00127 00128 /* Enable USART clock */ 00129 USARTx_APBPERIPHCLOCK(USARTx_CLK, ENABLE); 00130 00131 /* Connect PXx to USARTx_Tx */ 00132 GPIO_PinAFConfig(USARTx_TX_GPIO_PORT, USARTx_TX_SOURCE, USARTx_TX_AF); 00133 00134 /* Connect PXx to USARTx_Rx */ 00135 GPIO_PinAFConfig(USARTx_RX_GPIO_PORT, USARTx_RX_SOURCE, USARTx_RX_AF); 00136 00137 /* Configure USART Tx and Rx as alternate function push-pull */ 00138 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; 00139 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 00140 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; 00141 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; 00142 GPIO_InitStructure.GPIO_Pin = USARTx_TX_PIN; 00143 GPIO_Init(USARTx_TX_GPIO_PORT, &GPIO_InitStructure); 00144 00145 GPIO_InitStructure.GPIO_Pin = USARTx_RX_PIN; 00146 GPIO_Init(USARTx_RX_GPIO_PORT, &GPIO_InitStructure); 00147 00148 /* USARTx configuration ----------------------------------------------------*/ 00149 /* USARTx configured as follow: 00150 - BaudRate = 230400 baud 00151 - Word Length = 8 Bits 00152 - One Stop Bit 00153 - No parity 00154 - Hardware flow control disabled (RTS and CTS signals) 00155 - Receive and transmit enabled 00156 */ 00157 USART_InitStructure.USART_BaudRate = 230400; 00158 USART_InitStructure.USART_WordLength = USART_WordLength_8b; 00159 USART_InitStructure.USART_StopBits = USART_StopBits_1; 00160 USART_InitStructure.USART_Parity = USART_Parity_No; 00161 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; 00162 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; 00163 USART_Init(USARTx, &USART_InitStructure); 00164 00165 /* NVIC configuration: Enable the USARTx Interrupt */ 00166 NVIC_InitStructure.NVIC_IRQChannel = USARTx_IRQn; 00167 NVIC_InitStructure.NVIC_IRQChannelPriority = 0; 00168 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 00169 NVIC_Init(&NVIC_InitStructure); 00170 00171 /* Enable USART */ 00172 USART_Cmd(USARTx, ENABLE); 00173 00174 } 00175 00176 /** 00177 * @brief Configure a SysTick Base time to 10 ms. 00178 * @param None 00179 * @retval None 00180 */ 00181 static void SysTickConfig(void) 00182 { 00183 /* Setup SysTick Timer for 10ms interrupts */ 00184 if (SysTick_Config(SystemCoreClock / 100)) 00185 { 00186 /* Capture error */ 00187 while (1); 00188 } 00189 /* Configure the SysTick handler priority */ 00190 NVIC_SetPriority(SysTick_IRQn, 0x0); 00191 } 00192 00193 /** 00194 * @brief Configure CRC peripheral to use 8-bit polynomials 00195 * @param poly: the CRC polynomial 00196 * @retval None 00197 */ 00198 static void CRC_Config(uint8_t poly) 00199 { 00200 /* Enable CRC AHB clock interface */ 00201 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_CRC, ENABLE); 00202 00203 /* DeInit CRC peripheral */ 00204 CRC_DeInit(); 00205 00206 /* Init the INIT register */ 00207 CRC_SetInitRegister(0); 00208 00209 /* Select 8-bit polynomial size */ 00210 CRC_PolynomialSizeSelect(CRC_PolSize_8); 00211 00212 /* Set the polynomial coefficients */ 00213 CRC_SetPolynomial(poly); 00214 } 00215 00216 #ifdef USE_FULL_ASSERT 00217 00218 /** 00219 * @brief Reports the name of the source file and the source line number 00220 * where the assert_param error has occurred. 00221 * @param file: pointer to the source file name 00222 * @param line: assert_param error line source number 00223 * @retval None 00224 */ 00225 void assert_failed(uint8_t* file, uint32_t line) 00226 { 00227 /* User can add his own implementation to report the file name and line number, 00228 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ 00229 00230 /* Infinite loop */ 00231 while (1) 00232 { 00233 } 00234 } 00235 #endif 00236 00237 /** 00238 * @} 00239 */ 00240 00241 00242 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/