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uart.c

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+/*
+    asd
+*/
+//libraries
+#include "uart.h"
+
+//paths and global variables
+#define incomplet_uart_path "/dev/ttyO"
+
+int uartFile[6];    //file descriptor
+unsigned char receive[6][100];      //declare a buffer for receiving data
+struct termios options;               //The termios structure is vital
+
+//funtions
+
+int uartConf(unsigned char uartNumber, int baudRate){
+    
+    unsigned char fullFileName[11];
+    
+    //completing uart file path
+    if ((uartNumber == 1) ||
+        (uartNumber == 2) ||
+        (uartNumber == 4) ||
+        (uartNumber == 5)) sprintf(fullFileName, incomplet_uart_path "%d", uartNumber);
+    else{
+        perror("Wrong UART number. " \
+             "UART numbers availables 1, 2, 4 or 5.\n");
+        return 2;
+    }
+    
+    //openign uart file
+    printf("Configuring UART%d.\n", uartNumber);
+    if ((uartFile[uartNumber] = open(fullFileName, O_RDWR | O_NOCTTY | O_NDELAY | O_NONBLOCK))<0){
+    //if ((uartFile[uartNumber] = open(fullFileName, O_RDWR | O_NOCTTY | O_NDELAY))<0){
+    //if ((uartFile[uartNumber] = open(fullFileName, O_RDWR | O_NOCTTY))<0){
+        perror("UART: Failed to open the file.\n");
+        return -1;
+    }
+    
+    //Sets the parameters associated with file
+    tcgetattr(uartFile[uartNumber], &options);
+    
+    options.c_ispeed = 0;
+    options.c_lflag = 0;
+    options.c_line = 0;
+    options.c_oflag = 0;
+    options.c_ospeed = 0;
+    
+    // Set up the communications options:
+    // 8-bit, enable receiver, no modem control lines
+    options.c_cflag = baudRate | CS8 | CREAD | CLOCAL;
+    options.c_iflag = IGNPAR;    //ignore partity errors, CR -> newline
+    //options.c_iflag = IGNPAR | ICRNL;    //ignore partity errors, CR -> newline
+    //options.c_lflag = ICANON;
+    tcflush(uartFile[uartNumber], TCIOFLUSH);             //discard file information not transmitted
+    tcsetattr(uartFile[uartNumber], TCSANOW, &options);  //changes occur immmediately
+    
+    printf("UART%d configurated.\n", uartNumber);
+    
+    
+    return 0;
+}
+
+int uartClose(unsigned char uartNumber){
+    printf("Closing UART4.\n"); close(uartFile[uartNumber]);
+    return 0;
+}
+
+int uartTransmit(unsigned char uartNumber, unsigned char message[]){
+
+   int count;
+    
+   //writing file
+   if ((count = write(uartFile[uartNumber], message, (strlen(message))))<0){        //send the string
+      perror("Failed to write to the output\n");
+      return -1;
+   }
+   tcflush(uartFile[uartNumber], TCOFLUSH);
+
+   return 0;
+}
+
+int uartReceive(unsigned char uartNumber){
+    
+    int count;
+
+    /*if ((count = read(uartFile[uartNumber], (void*)receive[uartNumber], 100))<0){   //receive[uartNumber] the data
+        perror("Failed to read from the input\n");
+        return -1;
+    }*/
+    while((count = read(uartFile[uartNumber], (void*)receive[uartNumber], 100)) < 0);
+    tcflush(uartFile[uartNumber], TCIFLUSH);
+
+    return count;
+}