add erase region command

Author: igrr

README.md

@@ -37,6 +37,7 @@ Argument | Description
 ```-ca <address>``` | Address in flash memory to upload the data to. This address is interpreted as hexadecimal. Default is 0x00000000.
 ```-cf <filename>``` | Upload the file to flash. Parameters that set the port, baud rate, and address must precede the -cf command.
 ```-cp <size>``` | Pad last written section of firmware image to the given size, in bytes.
+```-cz <size>``` | Erase `size` bytes of flash starting from address set using `-ca` flag. Erase region boundaries must be aligned to 4kB.
 ```-ce``` | Erase flash
 ```-cr``` | Reset chip into app using the selected reset method
 

argparse/argparse.c

@@ -115,6 +115,9 @@ they are given.\n\
     Upload the file to flash. Parameters that set the port, baud rate, and address\n\
     must precede the -cf command.\n\
 \n\
+-cz <size>\n\
+    Erase <size> bytes, starting from the address set using -ca flag.\n\
+\n\
 -cr\n\
     Reset chip into app using the selected reset method.\n\
 \n\

argparse/argparse_commcmd.c

@@ -86,6 +86,17 @@ int argparse_commcmd(int num_args, char **arg_ptr)
                 }
                 break;
 
+            case 'z':
+                if (num_args < 1)
+                {
+                    return 0;
+                }
+                if (espcomm_erase_region(arg_ptr[0]))
+                {
+                    return 2;
+                }
+                break;
+
             case 'd':
                 if (num_args < 1)
                 {

espcomm/espcomm.c

@@ -565,6 +565,30 @@ bool espcomm_upload_file(const char *name)
     return true;
 }
 
+bool espcomm_erase_region(const char* size)
+{
+    uint32_t erase_size = (uint32_t) strtol(size, NULL, 16);
+    LOGDEBUG("setting erase size to 0x%08X",erase_size);
+    
+    if(!espcomm_open())
+    {
+        LOGERR("espcomm_open failed");
+        return false;
+    }
+
+    INFO("Erasing 0x%X bytes starting at 0x%08X\n", erase_size, espcomm_address);
+    LOGDEBUG("erasing flash");
+    int res = espcomm_start_flash(erase_size, espcomm_address);
+    if (res == 0)
+    {
+        LOGWARN("espcomm_send_command(FLASH_DOWNLOAD_BEGIN) failed");
+        espcomm_close();
+        return false;
+    }
+
+    return true;
+}
+
 int espcomm_start_app(int reboot)
 {
     if(!espcomm_open())

espcomm/espcomm.h

@@ -80,7 +80,7 @@ bool espcomm_upload_file_compressed(const char* name);
 int espcomm_file_uploaded();
 int espcomm_start_app(int reboot);
 bool espcomm_reset();
-
+bool espcomm_erase_region(const char* size);
 bool espcomm_erase_flash();
 
 #endif