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STM8S/A Standard Peripherals Firmware Library
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STM8S_StdPeriph_Examples/UART1/UART1_HalfDuplex/main.c
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00001 /** 00002 ****************************************************************************** 00003 * @file UART1_HalfDuplex\main.c 00004 * @author MCD Application Team 00005 * @version V2.2.0 00006 * @date 30-September-2014 00007 * @brief This file contains the main function for UART1 in Half-Duplex mode example. 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_HalfDuplex 00033 * @{ 00034 */ 00035 00036 /* Private typedef -----------------------------------------------------------*/ 00037 typedef enum {FAILED = 0, PASSED = !FAILED} TestStatus; 00038 00039 /* Private define ------------------------------------------------------------*/ 00040 #define TxBufferSize1 (countof(TxBuffer1) - 1) 00041 #define TxBufferSize2 (countof(TxBuffer2) - 1) 00042 /* Private macro -------------------------------------------------------------*/ 00043 #define countof(a) (sizeof(a) / sizeof(*(a))) 00044 /* To run the transmitter connect the UART1_TX on the UART3_RX, uncomment the line 00045 "#define transmitter" and comment the line "#define receiver" */ 00046 #define transmitter 00047 00048 /* To run the transmitter connect the UART1_TX on the UART3_TX , uncomment the line 00049 "#define receiver" and comment the line "#define transmitter" */ 00050 #define receiver 00051 /* Private variables ---------------------------------------------------------*/ 00052 uint8_t TxBuffer1[] = "HalfDuplex Example: UART1 -> UART3 using HalfDuplex mode"; 00053 uint8_t TxBuffer2[] = "HalfDuplex Example: UART3 -> UART1 using HalfDuplex mode"; 00054 uint8_t RxBuffer1[TxBufferSize2]={0}; 00055 uint8_t RxBuffer2[TxBufferSize1]={0}; 00056 uint8_t NbrOfDataToRead1 = TxBufferSize2; 00057 uint8_t NbrOfDataToRead2 = TxBufferSize1; 00058 uint8_t TxCounter1 = 0, RxCounter1 = 0; 00059 uint8_t TxCounter2 = 0, RxCounter2 = 0; 00060 __IO TestStatus TransferStatus1 = FAILED, TransferStatus2 = FAILED; 00061 00062 /* Private function prototypes -----------------------------------------------*/ 00063 TestStatus Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength); 00064 static void CLK_Config(void); 00065 static void UART_Config(void); 00066 static void GPIO_Config(void); 00067 /* Private functions ---------------------------------------------------------*/ 00068 00069 /** 00070 * @brief Main program. 00071 * @param None 00072 * @retval None 00073 */ 00074 void main(void) 00075 { 00076 /* GPIO configuration -----------------------------------------*/ 00077 GPIO_Config(); 00078 00079 /* CLK configuration -----------------------------------------*/ 00080 CLK_Config(); 00081 00082 /* UART configuration -----------------------------------------*/ 00083 UART_Config(); 00084 00085 #ifdef transmitter 00086 00087 while (NbrOfDataToRead2--) 00088 { 00089 /* Wait until end of transmit */ 00090 while (UART1_GetFlagStatus(UART1_FLAG_TXE) == RESET) 00091 { 00092 } 00093 /* Write one byte in the UART1 Transmit Data Register */ 00094 UART1_SendData8(TxBuffer1[TxCounter1++]); 00095 00096 /* Wait the byte is entirely received by UART3 */ 00097 while (UART3_GetFlagStatus(UART3_FLAG_RXNE) == RESET) 00098 { 00099 } 00100 /* Store the received byte in the RxBuffer2 */ 00101 RxBuffer2[RxCounter2++] = UART3_ReceiveData8(); 00102 } 00103 /* Check the received data with the send ones */ 00104 00105 TransferStatus1 = Buffercmp(TxBuffer1, RxBuffer2, TxBufferSize1); 00106 /* TransferStatus = PASSED, if the data transmitted from UART1 and received 00107 by UART3 are the same */ 00108 /* TransferStatus = FAILED, if the data transmitted from UART1 and received 00109 by UART3 are different */ 00110 #endif 00111 #ifdef receiver 00112 /* Clear the UART1 Data Register */ 00113 UART1_ReceiveData8(); 00114 00115 while (NbrOfDataToRead1--) 00116 { 00117 /* Wait until end of transmit */ 00118 while (UART3_GetFlagStatus(UART3_FLAG_TXE)== RESET) 00119 { 00120 } 00121 /* Write one byte in the UART3 Transmit Data Register */ 00122 UART3_SendData8(TxBuffer2[TxCounter2++]); 00123 00124 /* Wait the byte is entirely received by UART1 */ 00125 while (UART1_GetFlagStatus(UART1_FLAG_RXNE) == RESET) 00126 { 00127 } 00128 /* Store the received byte in the RxBuffer1 */ 00129 RxBuffer1[RxCounter1++] = UART1_ReceiveData8(); 00130 } 00131 00132 /* Check the received data with the send ones */ 00133 TransferStatus2 = Buffercmp(TxBuffer2, RxBuffer1, TxBufferSize2); 00134 /* TransferStatus = PASSED, if the data transmitted from UART3 and received 00135 by UART1 are the same */ 00136 /* TransferStatus = FAILED, if the data transmitted from UART3 and received 00137 by UART1 are different */ 00138 #endif 00139 while (1) 00140 {} 00141 } 00142 00143 /** 00144 * @brief Configure system clock to run at 16Mhz 00145 * @param None 00146 * @retval None 00147 */ 00148 static void CLK_Config(void) 00149 { 00150 /* Initialization of the clock */ 00151 /* Clock divider to HSI/1 */ 00152 CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1); 00153 } 00154 00155 /** 00156 * @brief Configure UART1 Tx pin as Output open-drain high-impedance level 00157 * @param None 00158 * @retval None 00159 */ 00160 static void GPIO_Config(void) 00161 { 00162 /* Set PA5 as Output open-drain high-impedance level (UART1_Tx)*/ 00163 GPIO_Init(GPIOA, GPIO_PIN_5, GPIO_MODE_OUT_OD_HIZ_FAST); 00164 } 00165 00166 /** 00167 * @brief UART1 and UART3 Configuration for half duplex communication 00168 * @param None 00169 * @retval None 00170 */ 00171 static void UART_Config(void) 00172 { 00173 /* UART1 and UART3 configured as follow: 00174 - BaudRate = 230400 baud 00175 - Word Length = 8 Bits 00176 - One Stop Bit 00177 - No parity 00178 - Receive and transmit enabled 00179 */ 00180 UART1_DeInit(); 00181 UART1_Init((uint32_t)230400, UART1_WORDLENGTH_8D, UART1_STOPBITS_1, UART1_PARITY_NO, 00182 UART1_SYNCMODE_CLOCK_DISABLE, UART1_MODE_TXRX_ENABLE); 00183 00184 UART3_DeInit(); 00185 UART3_Init((uint32_t)230400, UART3_WORDLENGTH_8D, UART3_STOPBITS_1, UART3_PARITY_NO, 00186 UART3_MODE_TXRX_ENABLE); 00187 00188 /* Enable UART1 Half Duplex Mode*/ 00189 UART1_HalfDuplexCmd(ENABLE); 00190 } 00191 00192 /** 00193 * @brief Compares two buffers. 00194 * @param pBuffer1 First buffer to be compared. 00195 * @param pBuffer2 Second buffer to be compared. 00196 * @param BufferLength Buffer's length 00197 * @retval TestStatus Status of buffer comparison 00198 * - PASSED: pBuffer1 identical to pBuffer2 00199 * - FAILED: pBuffer1 differs from pBuffer2 00200 * @par Required preconditions: 00201 * None 00202 */ 00203 TestStatus Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength) 00204 { 00205 while (BufferLength--) 00206 { 00207 if (*pBuffer1 != *pBuffer2) 00208 { 00209 return FAILED; 00210 } 00211 00212 pBuffer1++; 00213 pBuffer2++; 00214 } 00215 00216 return PASSED; 00217 } 00218 #ifdef USE_FULL_ASSERT 00219 00220 /** 00221 * @brief Reports the name of the source file and the source line number 00222 * where the assert_param error has occurred. 00223 * @param file: pointer to the source file name 00224 * @param line: assert_param error line source number 00225 * @retval None 00226 */ 00227 void assert_failed(uint8_t* file, uint32_t line) 00228 { 00229 /* User can add his own implementation to report the file name and line number, 00230 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ 00231 00232 /* Infinite loop */ 00233 while (1) 00234 { 00235 } 00236 } 00237 #endif 00238 00239 /** 00240 * @} 00241 */ 00242 00243 00244 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/