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STM8S/A Standard Peripherals Firmware Library
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STM8S_StdPeriph_Examples/UART1/UART1_Synchronous/main.c
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00001 /** 00002 ****************************************************************************** 00003 * @file UART1_Synchronous\main.c 00004 * @brief This file contains the main function for UART1 Synchronous mode example. 00005 * @author MCD Application Team 00006 * @version V2.2.0 00007 * @date 30-September-2014 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 "stm8s.h" 00030 00031 /** 00032 * @addtogroup UART1_Synchronous 00033 * @{ 00034 */ 00035 00036 /* Private typedef -----------------------------------------------------------*/ 00037 typedef enum {FAILED = 0, PASSED = !FAILED} TestStatus; 00038 /* Private define ------------------------------------------------------------*/ 00039 #define TxBufferSize1 (countof(TxBuffer1) - 1) 00040 #define TxBufferSize2 (countof(TxBuffer2) - 1) 00041 /* Private macro -------------------------------------------------------------*/ 00042 #define countof(a) (sizeof(a) / sizeof(*(a))) 00043 /* Private variables ---------------------------------------------------------*/ 00044 uint8_t TxBuffer1[] = "UART1 Example: UART1 -> SPI using TXE and RXNE Flags"; 00045 uint8_t TxBuffer2[] = "UART1 Example: SPI -> UART1 using TXE and RXNE Flags"; 00046 uint8_t RxBuffer1[TxBufferSize2] = {0}; 00047 uint8_t RxBuffer2[TxBufferSize1] = {0}; 00048 uint8_t NbrOfDataToRead = TxBufferSize1; 00049 __IO uint8_t TxCounter = 0, RxCounter = 0; 00050 __IO TestStatus TransferStatus1 = FAILED, TransferStatus2 = FAILED; 00051 00052 /* Private function prototypes -----------------------------------------------*/ 00053 TestStatus Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength); 00054 void Delay (uint16_t nCount); 00055 static void CLK_Config(void); 00056 static void UART1_Config(void); 00057 static void SPI_Config(void); 00058 /* Private functions ----------------------------------------------------------*/ 00059 00060 /** 00061 * @brief Main program. 00062 * @param None 00063 * @retval None 00064 */ 00065 void main(void) 00066 { 00067 /* Clock configuration -----------------------------------------*/ 00068 CLK_Config(); 00069 00070 /* UART1 configuration -----------------------------------------*/ 00071 UART1_Config(); 00072 00073 /* SPI configuration -----------------------------------------*/ 00074 SPI_Config(); 00075 00076 /* Enable the UART1*/ 00077 UART1_Cmd(ENABLE); 00078 00079 Delay(0xFFF); 00080 00081 /* Enable the SPI*/ 00082 SPI_Cmd(ENABLE); 00083 00084 while (NbrOfDataToRead--) 00085 { 00086 /* Wait until end of transmit */ 00087 while (SPI_GetFlagStatus(SPI_FLAG_TXE)== RESET) 00088 { 00089 } 00090 /* Write one byte in the SPI Transmit Data Register */ 00091 SPI_SendData(TxBuffer2[TxCounter]); 00092 /* Write one byte in the UART1 Transmit Data Register */ 00093 UART1_SendData8(TxBuffer1[TxCounter++]); 00094 /* Wait until end of transmit */ 00095 while (UART1_GetFlagStatus(UART1_FLAG_TXE) == RESET) 00096 { 00097 } 00098 /* Wait the byte is entirely received by UART1 */ 00099 while (UART1_GetFlagStatus(UART1_FLAG_RXNE) == RESET) 00100 { 00101 } 00102 /* Store the received byte in the RxBuffer1 */ 00103 RxBuffer1[RxCounter] = UART1_ReceiveData8(); 00104 /* Wait the byte is entirely received by SPI */ 00105 while (SPI_GetFlagStatus(SPI_FLAG_RXNE) == RESET) 00106 { 00107 } 00108 /* Store the received byte in the RxBuffer2 */ 00109 RxBuffer2[RxCounter++] = SPI_ReceiveData(); 00110 } 00111 00112 /* Check the received data with the sent ones */ 00113 TransferStatus1 = Buffercmp(TxBuffer1, RxBuffer2, TxBufferSize1); 00114 /* TransferStatus = PASSED, if the data transmitted from UART1 and received by SPI are the same */ 00115 /* TransferStatus = FAILED, if the data transmitted from UART1 and received by SPI are different */ 00116 TransferStatus2 = Buffercmp(TxBuffer2, RxBuffer1, TxBufferSize2); 00117 /* TransferStatus = PASSED, if the data transmitted from SPI and received by UART1 are the same */ 00118 /* TransferStatus = FAILED, if the data transmitted from SPI and received by UART1 are different */ 00119 00120 while (1) 00121 {} 00122 } 00123 00124 /** 00125 * @brief Configure system clock to run at 16Mhz 00126 * @param None 00127 * @retval None 00128 */ 00129 static void CLK_Config(void) 00130 { 00131 /* Initialization of the clock */ 00132 /* Clock divider to HSI/1 */ 00133 CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1); 00134 } 00135 00136 /** 00137 * @brief Configure UART1 for the synchronous mode communication 00138 * @param None 00139 * @retval None 00140 */ 00141 static void UART1_Config(void) 00142 { 00143 /* UART1 configured as follow: 00144 - Word Length = 8 Bits 00145 - 1 Stop Bit 00146 - No parity 00147 - BaudRate = 9600 baud 00148 - UART1 Clock enabled 00149 - Polarity Low 00150 - Phase Middle 00151 - Last Bit enabled 00152 - Receive and transmit enabled 00153 */ 00154 UART1_DeInit(); 00155 UART1_Init((uint32_t)9600, UART1_WORDLENGTH_8D, UART1_STOPBITS_1, UART1_PARITY_NO, 00156 (UART1_SyncMode_TypeDef)(UART1_SYNCMODE_CLOCK_ENABLE | UART1_SYNCMODE_CPOL_LOW |UART1_SYNCMODE_CPHA_MIDDLE |UART1_SYNCMODE_LASTBIT_ENABLE), 00157 UART1_MODE_TXRX_ENABLE); 00158 UART1_Cmd(DISABLE); 00159 } 00160 00161 /** 00162 * @brief Configure SPI for the full duplex communication with UART1 00163 * @param None 00164 * @retval None 00165 */ 00166 static void SPI_Config(void) 00167 { 00168 SPI_DeInit(); 00169 /* Initialize SPI in Slave mode */ 00170 SPI_Init(SPI_FIRSTBIT_LSB, SPI_BAUDRATEPRESCALER_2, SPI_MODE_SLAVE, SPI_CLOCKPOLARITY_LOW, 00171 SPI_CLOCKPHASE_1EDGE, SPI_DATADIRECTION_2LINES_FULLDUPLEX, SPI_NSS_SOFT,(uint8_t)0x07); 00172 } 00173 00174 /** 00175 * @brief Compares two buffers. 00176 * @param pBuffer1 First buffer to be compared. 00177 * @param pBuffer2 Second buffer to be compared. 00178 * @param BufferLength Buffer's length 00179 * @retval TestStatus Status of buffer comparison 00180 * - PASSED: pBuffer1 identical to pBuffer2 00181 * - FAILED: pBuffer1 differs from pBuffer2 00182 */ 00183 TestStatus Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength) 00184 { 00185 while (BufferLength--) 00186 { 00187 if (*pBuffer1 != *pBuffer2) 00188 { 00189 return FAILED; 00190 } 00191 00192 pBuffer1++; 00193 pBuffer2++; 00194 } 00195 00196 return PASSED; 00197 } 00198 00199 /** 00200 * @brief Delay. 00201 * @param nCount 00202 * @retval None 00203 */ 00204 void Delay(uint16_t nCount) 00205 { 00206 /* Decrement nCount value */ 00207 while (nCount != 0) 00208 { 00209 nCount--; 00210 } 00211 } 00212 00213 #ifdef USE_FULL_ASSERT 00214 00215 /** 00216 * @brief Reports the name of the source file and the source line number 00217 * where the assert_param error has occurred. 00218 * @param file: pointer to the source file name 00219 * @param line: assert_param error line source number 00220 * @retval None 00221 */ 00222 void assert_failed(uint8_t* file, uint32_t line) 00223 { 00224 /* User can add his own implementation to report the file name and line number, 00225 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ 00226 00227 /* Infinite loop */ 00228 while (1) 00229 { 00230 } 00231 } 00232 #endif 00233 00234 /** 00235 * @} 00236 */ 00237 00238 00239 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/