Paspberry Pi Pi-Lite

Pi-Lite

SPEED(value) $$$SPEED200[RETURN] F(value) example (pacman) $$$F00000000000000000000011100001111111001111111011111111111110111111110111101100011001100011 0000000000000000000000000000000000000 B(column),(value) examples $$$B1,89[RETURN] - column 1 set to 89% $$$B14,20[RETURN] - column 14 set to 20% V(row),(value) examples $$$V1,89[RETURN] - bar 1 set to 89% $$$V2,20[RETURN] - bar 2 set to 20% P(column),(row),(action) examples $$$P4,4,ON[RETURN] $$$P4,4,OFF[RETURN] $$$P4,4,TOGGLE[RETURN] ALL,(value) examples $$$ALL,ON $$$ALL,OFF SCROLL(value) examples $$$SCROLL-4[RETURN] T(column),(row),(character) examples $$$T1,1,Z[RETURN] - display a Z at location 4,4

#include <sys/types.h> #include <sys/stat.h> #include <stdio.h> #include <string.h> #include <unistd.h> #include <fcntl.h> #include <errno.h> #include <termios.h> #define BAUDRATE B9600 #define MODEMDEVICE "/dev/ttyAMA0" #define _POSIX_SOURCE 1 /* POSIX compliant source */ int main(int argc, char ** argv) { int fd; struct termios oldtio,newtio; char buff[255]; // Open the Port. We want read/write, no "controlling tty" status, and open it no matter what state DCD is in fd = open(MODEMDEVICE, O_RDWR | O_NOCTTY | O_NDELAY); if (fd == -1) { perror("open_port: Unable to open /dev/ttyAMA0 - "); return(-1); } bzero(&newtio, sizeof(newtio)); /* clear struct for new port settings */ /* BAUDRATE: Set bps rate. You could also use cfsetispeed and cfsetospeed. CRTSCTS : output hardware flow control (only used if the cable has all necessary lines. See sect. 7 of Serial-HOWTO) CS8 : 8n1 (8bit,no parity,1 stopbit) CLOCAL : local connection, no modem contol CREAD : enable receiving characters */ newtio.c_cflag = BAUDRATE | CRTSCTS | CS8 | CLOCAL | CREAD; /* IGNPAR : ignore bytes with parity errors ICRNL : map CR to NL (otherwise a CR input on the other computer will not terminate input) otherwise make device raw (no other input processing) */ newtio.c_iflag = IGNPAR | ICRNL; /* Raw output. */ newtio.c_oflag = 0; /* ICANON : enable canonical input disable all echo functionality, and don't send signals to calling program */ newtio.c_lflag = ICANON; /* initialize all control characters default values can be found in /usr/include/termios.h, and are given in the comments, but we don't need them here */ newtio.c_cc[VINTR] = 0; /* Ctrl-c */ newtio.c_cc[VQUIT] = 0; /* Ctrl-\ */ newtio.c_cc[VERASE] = 0; /* del */ newtio.c_cc[VKILL] = 0; /* @ */ newtio.c_cc[VEOF] = 4; /* Ctrl-d */ newtio.c_cc[VTIME] = 0; /* inter-character timer unused */ newtio.c_cc[VMIN] = 1; /* blocking read until 1 character arrives */ newtio.c_cc[VSWTC] = 0; /* '\0' */ newtio.c_cc[VSTART] = 0; /* Ctrl-q */ newtio.c_cc[VSTOP] = 0; /* Ctrl-s */ newtio.c_cc[VSUSP] = 0; /* Ctrl-z */ newtio.c_cc[VEOL] = 0; /* '\0' */ newtio.c_cc[VREPRINT] = 0; /* Ctrl-r */ newtio.c_cc[VDISCARD] = 0; /* Ctrl-u */ newtio.c_cc[VWERASE] = 0; /* Ctrl-w */ newtio.c_cc[VLNEXT] = 0; /* Ctrl-v */ newtio.c_cc[VEOL2] = 0; /* '\0' */ /* now clean the modem line and activate the settings for the port */ tcflush(fd, TCIFLUSH); tcsetattr(fd,TCSANOW,&newtio); // Turn off blocking for reads, use (fd, F_SETFL, FNDELAY) if you want that fcntl(fd, F_SETFL, 0); // Write to the port int n = write(fd,"Hello Peripheral\n",20); if (n < 0) { perror("Write failed - "); return -1; } // Don't forget to clean up close(fd); /* restore the old port settings */ tcsetattr(fd,TCSANOW,&oldtio); return 0; }

Pi-Lite för Raspberry Pi