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