flash: added easy way to reset the target (#505)

* flash: added easy way to reset the target

st-flash does now have a 'reset' command
makes it easy to reset the Target

* Doc: added man page entry for reset command of st-flash

doc/man/st-flash.md

@@ -32,6 +32,8 @@ read *FILE* *ADDR* *SIZE*
 erase
 :   Perform a mass erasing of the device firmware
 
+reset
+:   Reset the target
 
 # OPTIONS
 

include/stlink/tools/flash.h

@@ -7,7 +7,7 @@
 #define DEBUG_LOG_LEVEL 100
 #define STND_LOG_LEVEL  50
 
-enum flash_cmd {FLASH_CMD_NONE = 0, FLASH_CMD_WRITE = 1, FLASH_CMD_READ = 2, FLASH_CMD_ERASE = 3};
+enum flash_cmd {FLASH_CMD_NONE = 0, FLASH_CMD_WRITE = 1, FLASH_CMD_READ = 2, FLASH_CMD_ERASE = 3, CMD_RESET = 4};
 enum flash_format {FLASH_FORMAT_BINARY = 0, FLASH_FORMAT_IHEX = 1};
 struct flash_opts
 {

src/tools/flash.c

@@ -33,6 +33,7 @@ static void usage(void)
     puts("stlinkv1 command line: ./st-flash [--debug] /dev/sgX erase");
     puts("stlinkv2 command line: ./st-flash [--debug] [--reset] [--serial <serial>] [--format <format>] {read|write} <path> <addr> <size>");
     puts("stlinkv2 command line: ./st-flash [--debug] [--serial <serial>] erase");
+    puts("stlinkv2 command line: ./st-flash [--debug] [--serial <serial>] reset");
     puts("                       Use hex format for addr, <serial> and <size>.");
     puts("                       Format may be 'binary' (default) or 'ihex', although <addr> must be specified for binary format only.");
     puts("                       ./st-flash [--version]");
@@ -168,6 +169,17 @@ int main(int ac, char** av)
             printf("stlink_erase_flash_mass() == -1\n");
             goto on_error;
         }
+    } else if (o.cmd == CMD_RESET)
+    {
+        if (stlink_jtag_reset(sl, 2)) {
+            printf("Failed to reset JTAG\n");
+            goto on_error;
+        }
+
+        if (stlink_reset(sl)) {
+            printf("Failed to reset device\n");
+            goto on_error;
+        }
     }
     else /* read */
     {

src/tools/flash_opts.c

@@ -99,6 +99,10 @@ int flash_get_opts(struct flash_opts* o, int ac, char** av)
             if (o->cmd != FLASH_CMD_NONE) return -1;
             o->cmd = FLASH_CMD_WRITE;
         }
+        else if (strcmp(av[0], "reset") == 0) {
+            if (o->cmd != FLASH_CMD_NONE) return -1;
+            o->cmd = CMD_RESET;
+        }
         else if(starts_with(av[0], "/dev/")) {
             if (o->devname) return -1;
             o->devname = av[0];