Merge branch 'master' of ssh://tetalab.org:2213/tTh/DD2-monitor

Je merge, donc je suis.

.gitignore

@@ -1,7 +1,7 @@
 a.out
 *.o
 fake-values
-essai
+essai serial/t
 doc/*.toc doc/*.log doc/*.aux doc/*.pdf
 
 

serial/Makefile

@@ -0,0 +1,9 @@
+
+
+
+serial.o:	serial.c serial.h Makefile
+	gcc -Wall -c $<
+
+t:	t.c serial.o Makefile
+	gcc -Wall  $< serial.o -o $@
+

serial/README.md

@@ -1,8 +1,20 @@
 
-
 # Serial Input
 
 But premier de ce module : recevoir les données fournies par l'automate
 de contrôle du phytotron.
 
+Ayant déja pratiqué ce genre de chose pour un déja ancien
+[projet](http://art.dinorama.fr/bdf/)
+avec _MadPhoenix_, je me propose de reprendre quelques parties de ce code,
+de le remettre au gout du jour et de le tester dès que possible.
+
+
+
+
+
+
+
+
+
 

serial/serial.c

@@ -0,0 +1,117 @@
+
+#include <stdio.h>
+#include  <stdlib.h>
+#include <unistd.h>			//Used for UART
+#include <fcntl.h>			//Used for UART
+#include <termios.h>		//Used for UART
+
+#include  "serial.h"
+
+/* -------------------------------------------------------------------- */
+static int baudrate2const(int bauds)
+{
+int	br;
+
+switch (bauds)
+	{
+	case 1200:	br = B1200;		break;
+	case 2400:	br = B2400;		break;
+	case 4800:	br = B4800;		break;
+	case 9600:	br = B9600;		break;
+	case 19200:	br = B19200;		break;
+	case 38400:	br = B38400;		break;
+	case 57600:	br = B57600;		break;
+	case 115200:	br = B115200;		break;
+	default:
+		fprintf(stderr, "baudrate %d invalide\n", bauds);
+		exit(1);	
+		break;
+	}
+return br;
+}
+/* -------------------------------------------------------------------- */
+
+int prepare_UART(char *port, int baudrate)
+{
+int		uart0 = -1;
+int		baudbits;
+struct termios	options;
+
+#if DEBUG_LEVEL
+fprintf(stderr, "%s ( %s %d )\n", __func__, port, baudrate);
+#endif
+// OPEN THE UART
+// The flags (defined in fcntl.h):
+//	Access modes (use 1 of these):
+//		O_RDONLY - Open for reading only.
+//		O_RDWR - Open for reading and writing.
+//		O_WRONLY - Open for writing only.
+//
+//	O_NDELAY / O_NONBLOCK (same function) - Enables nonblocking mode.
+// When set read requests on the file can return immediately with a
+// failure status
+// if there is no input immediately available (instead of blocking).
+// Likewise, write requests can also return
+// immediately with a failure status if the output can't be written
+// immediately.
+//
+// O_NOCTTY - When set and path identifies a terminal device, open()
+// shall not cause the terminal device to become the controlling terminal
+// for the process.
+
+uart0 = open(port, O_RDWR | O_NOCTTY);
+if (uart0== -1)
+	{
+	perror("unable to open uart ");
+	return -1;
+	}
+	
+// CONFIGURE THE UART
+// The flags defined in /usr/include/termios.h -
+// see http://pubs.opengroup.org/onlinepubs/007908799/xsh/termios.h.html
+//	Baud rate:- B1200, B2400, B4800, B9600, B19200, B38400, B57600,
+//	B115200, B230400, B460800, B500000, B576000, B921600, B1000000,
+//	B1152000, B1500000, B2000000, B2500000, B3000000, B3500000, B4000000
+//	CSIZE:- CS5, CS6, CS7, CS8
+//	CLOCAL - Ignore modem status lines
+//	CREAD - Enable receiver
+//	IGNPAR = Ignore characters with parity errors
+//	ICRNL - Map CR to NL on input (Use for ASCII comms where you want
+//	to auto correct end of line characters - don't use for bianry comms!)
+//	PARENB - Parity enable
+//	PARODD - Odd parity (else even)
+
+
+baudbits = baudrate2const(baudrate);
+#if DEBUG_LEVEL
+fprintf(stderr, "%d -> %x\n", baudrate, baudbits);
+#endif
+tcgetattr(uart0, &options);
+options.c_cflag = baudbits | CS8 | CLOCAL | CREAD;	//<Set baud rate
+options.c_iflag = IGNPAR;
+options.c_oflag = 0;
+options.c_lflag = 0;
+tcflush(uart0, TCIFLUSH);
+tcsetattr(uart0, TCSANOW, &options);
+
+return uart0;
+}
+/* -------------------------------------------------------------------- */
+/*
+ *	maybe we have to check for timeout ?
+ */
+int getbyte(int fd)
+{
+unsigned char   byte;
+int             foo;
+
+foo = read(fd, &byte, 1);
+if (1 != foo)
+        {
+        perror("read a byte");
+        return -1;
+        }
+return (int)byte;
+}
+
+/* -------------------------------------------------------------------- */

serial/serial.h

@@ -0,0 +1,8 @@
+/*
+ *		serial.h
+ */
+
+int prepare_UART(char *port, int bauds);
+
+int getbyte(int fd);
+

serial/t.c

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+
+
+#include  <stdio.h>
+
+#include  "serial.h"
+
+int main (int argc, char *argv[])
+{
+int	serial_in;
+int	byte, foo;
+
+serial_in = prepare_UART("/dev/ttyS0", 9600);
+fprintf(stderr, "prepare uart -> %d\n", serial_in);
+
+for (foo=0; foo<20; foo++) {
+	byte = getbyte(serial_in);
+	printf("%6d    %02x\n", foo, byte);
+	}
+
+return 0;
+}