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.c

@@ -0,0 +1,173 @@
+#include "cli_i.h"
+#include "cli_commands.h"
+
+#include <api-hal-vcp.h>
+
+Cli* cli_alloc() {
+    Cli* cli = furi_alloc(sizeof(Cli));
+    CliCommandDict_init(cli->commands);
+
+    cli->mutex = osMutexNew(NULL);
+    furi_check(cli->mutex);
+
+    cli_reset_state(cli);
+
+    return cli;
+}
+
+void cli_free(Cli* cli) {
+    free(cli);
+}
+
+void cli_reset_state(Cli* cli) {
+    string_clear(cli->line);
+    string_init(cli->line);
+}
+
+void cli_putc(char c) {
+    api_hal_vcp_tx((uint8_t*)&c, 1);
+}
+
+void cli_print(const char* str) {
+    api_hal_vcp_tx((uint8_t*)str, strlen(str));
+}
+
+void cli_print_version() {
+    cli_print("Build date:" BUILD_DATE ". "
+              "Git Commit:" GIT_COMMIT ". "
+              "Git Branch:" GIT_BRANCH ". "
+              "Commit Number:" GIT_BRANCH_NUM ".");
+}
+
+void cli_motd() {
+    cli_print("Flipper cli.\r\n");
+    cli_print_version();
+}
+
+void cli_nl() {
+    cli_print("\r\n");
+}
+
+void cli_prompt() {
+    cli_print("\r\n>: ");
+}
+
+void cli_backspace(Cli* cli) {
+    size_t s = string_size(cli->line);
+    if(s > 0) {
+        s--;
+        string_left(cli->line, s);
+        cli_putc(CliSymbolAsciiBackspace);
+        cli_putc(CliSymbolAsciiSpace);
+        cli_putc(CliSymbolAsciiBackspace);
+    } else {
+        cli_putc(CliSymbolAsciiBell);
+    }
+}
+
+void cli_enter(Cli* cli) {
+    // Normalize input
+    string_strim(cli->line);
+    if(string_size(cli->line) == 0) {
+        cli_prompt();
+        return;
+    }
+
+    // Get first word as command name
+    string_t command;
+    string_init(command);
+    size_t ws = string_search_char(cli->line, ' ');
+    if(ws == STRING_FAILURE) {
+        string_set(command, cli->line);
+        string_clear(cli->line);
+        string_init(cli->line);
+    } else {
+        string_set_n(command, cli->line, 0, ws);
+        string_right(cli->line, ws);
+        string_strim(cli->line);
+    }
+
+    // Search for command
+    furi_check(osMutexAcquire(cli->mutex, osWaitForever) == osOK);
+    CliCommand* cli_command = CliCommandDict_get(cli->commands, command);
+    furi_check(osMutexRelease(cli->mutex) == osOK);
+    if(cli_command) {
+        cli_nl();
+        cli_command->callback(cli->line, cli_command->context);
+        cli_prompt();
+    } else {
+        cli_nl();
+        cli_print("Command not found: ");
+        cli_print(string_get_cstr(command));
+        cli_prompt();
+        cli_putc(CliSymbolAsciiBell);
+    }
+
+    // Always finish with clean state
+    cli_reset_state(cli);
+}
+
+void cli_process_input(Cli* cli) {
+    char c;
+    size_t r;
+
+    r = api_hal_vcp_rx((uint8_t*)&c, 1);
+    if(r == 0) {
+        cli_reset_state(cli);
+    }
+
+    if(c == CliSymbolAsciiTab) {
+        cli_putc(CliSymbolAsciiBell);
+    } else if(c == CliSymbolAsciiSOH) {
+        cli_motd();
+        cli_prompt();
+    } else if(c == CliSymbolAsciiEOT) {
+        cli_reset_state(cli);
+    } else if(c == CliSymbolAsciiEsc) {
+        r = api_hal_vcp_rx((uint8_t*)&c, 1);
+        if(r && c == '[') {
+            api_hal_vcp_rx((uint8_t*)&c, 1);
+        } else {
+            cli_putc(CliSymbolAsciiBell);
+        }
+    } else if(c == CliSymbolAsciiBackspace || c == CliSymbolAsciiDel) {
+        cli_backspace(cli);
+    } else if(c == CliSymbolAsciiCR) {
+        cli_enter(cli);
+    } else if(c >= 0x20 && c < 0x7F) {
+        string_push_back(cli->line, c);
+        cli_putc(c);
+    } else {
+        cli_putc(CliSymbolAsciiBell);
+    }
+}
+
+void cli_add_command(Cli* cli, const char* name, CliCallback callback, void* context) {
+    string_t name_str;
+    string_init_set_str(name_str, name);
+    CliCommand c;
+    c.callback = callback;
+    c.context = context;
+
+    furi_check(osMutexAcquire(cli->mutex, osWaitForever) == osOK);
+    CliCommandDict_set_at(cli->commands, name_str, c);
+    furi_check(osMutexRelease(cli->mutex) == osOK);
+}
+
+void cli_task(void* p) {
+    Cli* cli = cli_alloc();
+
+    // Init basic cli commands
+    cli_commands_init(cli);
+
+    if(!furi_create("cli", cli)) {
+        printf("[cli_task] cannot create the cli record\n");
+        furiac_exit(NULL);
+    }
+
+    furiac_ready();
+
+    while(1) {
+        cli_process_input(cli);
+    }
+}