The ‘fd’ variable above is the file descriptor that serialOpen() returns. Tcsetattr (fd, &options) // Set new options Options.c_cflag |= PARENB // Enable Parity - even by default Options.c_cflag &= ~CSIZE // Mask out size Tcgetattr (fd, &options) // Read current options
C serial library linux serial#
parity control, modem control lines (via a USB adapter, there are none on the Pi’s on-board UART!) and so on, then you need to do some of this the “old fashioned” way.įor example – To set the serial line into 7 bit mode plus even parity, you need to do this…Īnd in a function: struct termios options The wiringSerial library is intended to provide simplified control – suitable for most applications, however if you need advanced control – e.g. you may wish to write a larger block of binary data where the serialPutchar() or serialPuts() function may not be the most appropriate function to use, in which case, you can use write() to send the data. system calls on this file descriptor as required. You can use the standard read(), write(), etc. Note: The file descriptor ( fd) returned is a standard Linux file descriptor. This discards all data received, or waiting to be send down the given device. This call will block for up to 10 seconds if no data is available (when it will return -1) Returns the next character available on the serial device.
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Returns the number of characters available for reading, or -1 for any error condition, in which case errno will be set appropriately.
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WiringPi includes a simplified serial port handling library.