Paul Griffith
Run multiple binaries on your mbed.
Diff: main.cpp
- Revision:
- 0:4ea2252690b9
- Child:
- 1:68f8899ed1ea
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed May 29 20:06:47 2013 +0000
@@ -0,0 +1,372 @@
+/******************************************************************************
+ * File: main.cpp
+ * Author: Paul Griffith
+ * Created: 27 May 2013
+ * Last Edit: see below
+ * Version: see below
+ *
+ * Description:
+ * Test program to demonstrate application switching.
+
+ * This program loads and runs one of several different binaries.
+ * The binaries are all present on the local filesystem, but are renamed to
+ * app1.mbd, app2.mbd and so on. The filenames must conform to the local
+ * filesystem's 8+3 filename rule and have an extension other then .bin.
+ * This ensures that the files can be accessed by the local filesystem library
+ * and that the interface chip does not act upon the binaries.
+ * Another requirement is that all other .bin files must be deleted from the
+ * local filesystem. This is necessary because downloaded files will always
+ * have more recent timestamps than ones created by the local filesystem.
+ * To switch applications, the current .bin file is deleted, the chosen app
+ * file is copied to a .bin and the nR pin is driven low. The interface chip
+ * then loads the .bin file into mbed's Flash.
+ *
+ * To use this program:
+ * 1. From the PC, remove all .bin files from the mbed local filesystem,
+ * 2. Compile as is, download to mbed and Flash it into mbed.
+ * 3. From the PC, rename the binary to app1.mbd.
+ * 4. Edit the MYNAME string to app2.bin
+ * 5. Save, recompile and download to mbed. Do NOT Flash into mbed.
+ * 6. From the PC, rename the binary to app2.mbd.
+ * 7. Edit the MYNAME string to app3.bin
+ * 8. Save, recompile and download to mbed. Do NOT Flash into mbed.
+ * 9. From the PC, rename the binary to app3.mbd.
+ * 10 Fit a wire jumper between mbed pin 9 (rstOut) and mbed pin 4 (nR).
+ * Another mbed I/O pin can be used if you change the RSTPIN definition.
+ * (If you don't fit a jumper you will have to press the Reset button
+ * when the Resetting mbed module... prompt appears).
+ *
+ * The program can now be run. It uses the virtual serial port at 9600 baud
+ * and has a simple command interpreter. All commands end with <Enter>.
+ * Use the 1, 2 and 3 commands to switch applications.
+ *
+ * Copyright (c) 2013 Paul Griffith.
+ * Released under the MIT License: http://mbed.org/license/mit
+ *
+ * Modifications:
+ * Ver Date By Details
+ * 0.00 27May13 PG File created.
+ * 1.00 29May13 PG Initial release.
+ *
+ ******************************************************************************/
+
+#define VERSION "1.00"
+#define MYNAME "app1.bin" //edit to desired name before compiling & downloading
+#define RSTPIN p9
+
+#include "mbed.h"
+
+void printHelps(void);
+void badArgs(void);
+void nyi(void);
+void pause(void);
+void usage(void);
+int getVal();
+int exist(char *);
+int copyFile(char*, char*);
+void listDir(char*);
+int renameFile(char*, char*);
+void resetMbed(void);
+
+Serial pc(USBTX, USBRX);
+LocalFileSystem local("local");
+
+int main() {
+ char buf[120], *cp;
+ char arg0[50], arg1[50], arg2[50];
+ int argc, i;
+
+ printf("\nApplication Switcher Demo (Version %s, %s %s)\n",
+ VERSION, __DATE__, __TIME__);
+ printf("I am application %s\n", MYNAME);
+ printf("Type ? for help\n");
+
+ strcpy(arg1, "/local/"); //build file name
+ strcpy(arg2, "/local/"); //build file name
+
+ while (1) {
+ printf("> ");
+ cp = buf;
+ while ( (*cp++ = putchar(getchar())) != '\r') ; //get a line of input
+ *cp = '\0'; //terminate buffer
+ printf("\n");
+ argc = sscanf(buf, "%s%s%s", arg0, &arg1[7], &arg2[7]); //extract cmd & args
+ if (argc < 1)
+ continue;
+ switch (arg0[0]) {
+
+ case '1': //load Application app1.bin
+ if (strcmp(MYNAME, "app1.bin") == 0) {
+ printf("Application app1.bin is already running!\n");
+ }
+ else {
+ sprintf(&arg1[7], MYNAME);
+ remove(arg1);
+ copyFile("/local/app1.mbd", "/local/app1.bin");
+ resetMbed();
+ }
+ break;
+
+ case '2': //load Application app2.bin
+ if (strcmp(MYNAME, "app2.bin") == 0) {
+ printf("Application app2.bin is already running!\n");
+ }
+ else {
+ sprintf(&arg1[7], MYNAME);
+ remove(arg1);
+ copyFile("/local/app2.mbd", "/local/app2.bin");
+ resetMbed();
+ }
+ break;
+
+ case '3': //load Application app3.bin
+ if (strcmp(MYNAME, "app3.bin") == 0) {
+ printf("Application app3.bin is already running!\n");
+ }
+ else {
+ sprintf(&arg1[7], MYNAME);
+ remove(arg1);
+ copyFile("/local/app3.mbd", "/local/app3.bin");
+ resetMbed();
+ }
+ break;
+
+ case 'c': //copy file
+ if (argc != 3) {
+ usage();
+ break;
+ }
+ i = copyFile(arg1, arg2);
+ printf("Copy %s to %s returned %d\n", arg1, arg2, i);
+ break;
+
+ case 'd': //delete file
+ if (argc != 2) {
+ usage();
+ break;
+ }
+ if (exist(arg1) == 0)
+ printf("File does not exist\n");
+ else {
+ remove(arg1);
+ printf("File deleted\n");
+ }
+ break;
+
+ case 'e': //check if file exists
+ if (argc != 2) {
+ usage();
+ break;
+ }
+ if (exist(arg1) != 0)
+ printf("File exists\n");
+ else
+ printf("File does not exist\n");
+ break;
+
+ case 'i': //identify self
+ printf("I am application %s\n", MYNAME);
+ break;
+
+ case 'l': //list files on local filesystem
+ listDir("/local");
+ break;
+
+ case 'r': //rename file on local filesystem
+ if (argc != 3) {
+ usage();
+ break;
+ }
+ i = renameFile(arg1, arg2);
+ printf("Rename %s to %s returned %d\n", arg1, arg2, i);
+ break;
+
+ case 'x': //reset mbed module
+ resetMbed();
+ break;
+
+ case '?': //print help
+ printHelps();
+ break;
+
+ default:
+ printf("?? Unknown command\n");
+ break;
+ }
+ }
+}
+
+//************************
+// Display command summary
+//************************
+
+void printHelps(void) {
+ printf("Command summary:\n");
+ printf("1 - 3 load specified application\n");
+ printf("c old new copy file on local filesystem\n");
+ printf("d filename delete file on local filesystem\n");
+ printf("e filename check if file exists on local filesystem\n");
+ printf("i identification\n");
+ printf("l list files on local filesystem\n");
+ printf("r old new rename file on local filesystem\n");
+ printf("x reset mbed module\n");
+}
+
+//************************
+// Miscellaneous functions
+//************************
+
+void badArgs(void) {
+ pc.printf("?? Bad arguments\n");
+}
+
+void nyi(void) {
+ pc.printf("!! Not yet implemented\n");
+}
+
+void pause(void)
+{
+ pc.printf("Press any key to continue . . .\n");
+ pc.getc();
+}
+
+void usage(void) {
+ printf("Invalid command usage\n");
+}
+
+// Get integer value from user. Used in enter functions
+
+int getVal() {
+ char buf[10];
+ char* cp;
+ int v;
+
+ cp = buf;
+ while ( (*cp++ = putchar(getchar())) != '\r') ;
+ *cp = '\0';
+ printf("\n");
+ v = 0;
+ sscanf(buf, "%d", &v);
+ return v;
+}
+
+int exist(char *name) {
+ FILE *fp;
+
+ fp = fopen(name, "r");
+ if (fp != NULL)
+ fclose(fp);
+ return ((fp == NULL) ? 0 : 1);
+}
+
+//*******************
+// Command processing
+//*******************
+
+// Copy file
+
+int copyFile(char *srcfile, char *destfile)
+{
+ char buf[512];
+ int end, r, w;
+ long length, size = 0;
+ FILE *fp, *fp2;
+ Timer timer;
+
+ fp = fopen(srcfile, "r");
+ if (fp == NULL)
+ {
+ printf("Source file does not exist\n");
+ return(-1);
+ }
+ if (exist(destfile) == 1)
+ {
+ printf("Destination file already exists\n");
+ fclose(fp);
+ return(-2);
+ }
+ fp2 = fopen(destfile, "w");
+ if (fp2 == NULL)
+ {
+ printf("Unable to create file\n");
+ fclose(fp);
+ return(-3);
+ }
+ fseek(fp, 0L, SEEK_END);
+ length = ftell(fp);
+ fseek(fp, 0L, SEEK_SET);
+
+ printf("copy %s to %s\n", srcfile, destfile);
+
+ printf("file length = %ld\n", length);
+ timer.start();
+ while (size < length)
+ {
+ r = fread(buf, 1, 512, fp); //read a sector
+ w = fwrite(buf, 1, r, fp2); //write a sector
+ if (w != r)
+ {
+ printf("file write error\n");
+ fclose(fp);
+ fclose(fp2);
+ return(-4);
+ }
+ if (r < 512) //reached end
+ break;
+ size += r;
+ }
+ end = timer.read_ms();
+ fclose(fp);
+ fclose(fp2);
+ printf("%ld bytes copied in %d.%03ds\n", size, end/1000, end%1000);
+ return(0);
+}
+
+
+// List directory
+
+void listDir(char *drive) {
+ DIR *d;
+ struct dirent *p;
+
+ d = opendir(drive);
+ if (d != NULL) {
+ while ((p = readdir(d)) != NULL) {
+ printf(" - %s\n", p->d_name);
+ }
+ }
+ else {
+ printf("Could not open directory!\n");
+ }
+ closedir(d);
+}
+
+// Rename file
+// this does not seem to work, perhaps rename() is broken?
+
+int renameFile(char* srcfile, char* destfile) {
+ if (exist(srcfile) == 0)
+ {
+ printf("Source file does not exist\n");
+ return(-2);
+ }
+ if (exist(destfile) == 1)
+ {
+ printf("Destination file already exists\n");
+ return(-3);
+ }
+ return( rename(srcfile, destfile) );
+}
+
+// Reset mbded module
+// Requires a wire jumper between an I/O pin and pin 4
+
+void resetMbed(void) {
+ DigitalOut rst(RSTPIN);
+
+ printf("Resetting mbed module...\n");
+ rst = 0;
+}
+
+// END of main.cpp
+