Jacques Pelletier
This is a program for testing the 8255 interface on protocoltool. It implements a software emulation of the bidirectional mode 2 of a 8255 chip.
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parallel_port_tester
by 
Jacques Pelletier
Revision 0:a5957f25b150, committed 2013-07-26
- Comitter:
- jpelletier
- Date:
- Fri Jul 26 04:51:00 2013 +0000
- Child:
- 1:51bc46468482
- Commit message:
- Initial commit
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Fri Jul 26 04:51:00 2013 +0000
@@ -0,0 +1,162 @@
+#include "mbed.h"
+
+//#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define PAR_NEGOTIATE_EXTENSIBILITY_LINK 0x80
+#define PAR_NEGOTIATE_REQ_EPP_MODE 0x40
+#define PAR_NEGOTIATE_REQ_ECP_MODE 0x10
+#define PAR_NEGOTIATE_REQ_ECP_RLE_MODE 0x30
+#define PAR_NEGOTIATE_REQ_DEV_ID_NIBBLE_MODE 0x04
+#define PAR_NEGOTIATE_REQ_DEV_ID_BYTE_MODE 0x05
+#define PAR_NEGOTIATE_REQ_DEV_ID_ECP_MODE 0x14
+#define PAR_NEGOTIATE_REQ_DEV_ID_ECP_RLE_MODE 0x34
+#define PAR_NEGOTIATE_NIBBLE_MODE 0x00
+#define PAR_NEGOTIATE_BYTE_MODE 0x01
+
+/*
+Instructions for use: connect the mbed to a parallel port using these connexions.
+use a terminal program to connect via USB to the mbed side.
+
+This program uses CR to rewrite over the status previously printed. Setup the terminal
+program so that CR = CR without line feed.
+
+15 nError -> p9
+13 Select -> p10
+12 PE -> p11
+11 Busy -> p12
+10 nAck -> p13
+
+ 1 nStrobe -> p14
+14 nAutoFeed -> p15
+16 nInit -> p16
+17 nSelectIn -> p17
+*/
+
+DigitalOut nError(p9);
+DigitalOut Select(p10);
+DigitalOut PaperOut(p11);
+DigitalOut Busy(p12);
+DigitalOut nAck(p13);
+
+DigitalIn nStrobe(p14);
+DigitalIn nAutoFeed(p15);
+DigitalIn nInit(p16);
+DigitalIn nSelectIn(p17);
+
+/*
+D0 p30 p0.4
+D1 p29 p0.5
+D2 p8 p0.6
+D3 p7 p0.7
+D4 p6 p0.8
+D5 p5 p0.9
+D6 p28 p0.10
+D7 p27 p0.11
+*/
+BusInOut PtrData(p30,p29,p8,p7,p6,p5,p28,p27);
+
+#define __DOUTBUFSIZE 256
+#define __DINBUFSIZE 256
+char __outstr[__DOUTBUFSIZE];
+char __instr[__DINBUFSIZE];
+
+Serial pc(USBTX, USBRX); // tx, rx
+
+int main() {
+
+char key;
+bool PortIsInput = false;
+
+ PtrData.input();
+
+ pc.printf("Parallel port tester on mbed\r\n\n");
+ pc.printf("Press keys 0-7,G,H,J,K and L to toggle output bits (inputs on PC)\r\n");
+ pc.printf("Press keys I and O to toggle data direction for bits 0-7\r\n");
+ pc.printf(" (be sure your PC and mbed don't output at the same time)\r\n\n");
+ pc.printf("PINS 9-2 1 14 16 17 ------ 15 13 12 11 10\r\n");
+ pc.printf("DATA 7-0 /STB /AF /INIT /SEL_IN ------/ERR SEL PO BUSY /ACK\r\n");
+ pc.printf("Keys ------ G H J K L\r\n");
+ // XX B B B B ------ B B B B B
+ while(1) {
+ pc.printf(" %02X %c %c %c %c %c %c %c %c %c \r",
+ PtrData & 0xff,
+ '0'| nStrobe,
+ '0'| nAutoFeed,
+ '0'| nInit,
+ '0'| nSelectIn,
+ '0'| nError,
+ '0'| Select,
+ '0'| PaperOut,
+ '0'| Busy,
+ '0'| nAck
+ );
+
+ if (pc.readable())
+ {
+ key = pc.getc();
+ switch(key)
+ {
+ case 'I':
+ PtrData.input();
+ PortIsInput = true;
+ break;
+ case 'O':
+ PtrData.output();
+ PortIsInput = false;
+ break;
+ case '0':
+ if (!PortIsInput)
+ PtrData = PtrData ^ 0x01;
+ break;
+ case '1':
+ if (!PortIsInput)
+ PtrData = PtrData ^ 0x02;
+ break;
+ case '2':
+ if (!PortIsInput)
+ PtrData = PtrData ^ 0x04;
+ break;
+ case '3':
+ if (!PortIsInput)
+ PtrData = PtrData ^ 0x08;
+ break;
+ case '4':
+ if (!PortIsInput)
+ PtrData = PtrData ^ 0x10;
+ break;
+ case '5':
+ if (!PortIsInput)
+ PtrData = PtrData ^ 0x20;
+ break;
+ case '6':
+ if (!PortIsInput)
+ PtrData = PtrData ^ 0x40;
+ break;
+ case '7':
+ if (!PortIsInput)
+ PtrData = PtrData ^ 0x80;
+ break;
+ case 'G':
+ nError = !nError;
+ break;
+ case 'H':
+ Select = !Select;
+ break;
+ case 'J':
+ PaperOut = !PaperOut;
+ break;
+ case 'K':
+ Busy = !Busy;
+ break;
+ case 'L':
+ nAck = !nAck;
+ break;
+ default:
+ ;
+ }
+ }
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Fri Jul 26 04:51:00 2013 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/b3110cd2dd17 \ No newline at end of file