USB VCP Cli (#237)

* Core: ring buffer.
* Api: usb vcp. F3: vcp glue code.
* Applications: cli draft version.
* Cli: basic working version, includes help and version commands
* HAL: vcp on f2
* Makefile: update openocd conf
* F3: vcp rx with freertos stream
* Cli: help
* Cli: standard commands, api-hal-uid
* Power: cli poweroff.

applications/cli/cli_commands.c

@@ -0,0 +1,54 @@
+#include "cli_commands.h"
+#include <api-hal.h>
+
+void cli_command_help(string_t args, void* context) {
+    (void)args;
+    Cli* cli = context;
+    cli_print("Commands we have:");
+
+    furi_check(osMutexAcquire(cli->mutex, osWaitForever) == osOK);
+    CliCommandDict_it_t it;
+    for(CliCommandDict_it(it, cli->commands); !CliCommandDict_end_p(it); CliCommandDict_next(it)) {
+        CliCommandDict_itref_t* ref = CliCommandDict_ref(it);
+        cli_print(" ");
+        cli_print(string_get_cstr(ref->key));
+    };
+    furi_check(osMutexRelease(cli->mutex) == osOK);
+
+    if(string_size(args) > 0) {
+        cli_nl();
+        cli_print("Also I have no clue what '");
+        cli_print(string_get_cstr(args));
+        cli_print("' is.");
+    }
+}
+
+void cli_command_version(string_t args, void* context) {
+    (void)args;
+    (void)context;
+    cli_print_version();
+}
+
+void cli_command_uuid(string_t args, void* context) {
+    (void)args;
+    (void)context;
+    size_t uid_size = api_hal_uid_size();
+    const uint8_t* uid = api_hal_uid();
+
+    string_t byte_str;
+    string_init(byte_str);
+    string_cat_printf(byte_str, "UID:");
+    for(size_t i = 0; i < uid_size; i++) {
+        uint8_t uid_byte = uid[i];
+        string_cat_printf(byte_str, "%02X", uid_byte);
+    }
+    cli_print(string_get_cstr(byte_str));
+}
+
+void cli_commands_init(Cli* cli) {
+    cli_add_command(cli, "help", cli_command_help, cli);
+    cli_add_command(cli, "?", cli_command_help, cli);
+    cli_add_command(cli, "version", cli_command_version, cli);
+    cli_add_command(cli, "!", cli_command_version, cli);
+    cli_add_command(cli, "uid", cli_command_uuid, cli);
+}