【ESP32-S2-Kaluga-1测评】控制台组件的使用
之前安装环境已经搭建完成，现在就可以进行应用开发了。DEMO 的例程在 ESP32 上面应该都是可以运行的，但是 ESP32S2 上面存在兼容性的问题，有一些外设和蓝牙的例程会运行失败，我这边也没有全部测试。## 控制台例程
类似于 linux 的控制台，可以通过输入指令的方式运行你期望的函数，前提功能实现需要提前预制，是非常实用的一个组件，只需要一个串口。
### 工程源码
### 控制台的初始化
```c
static void initialize_console(void)
{
/* Drain stdout before reconfiguring it */
fflush(stdout);
fsync(fileno(stdout));
/* Disable buffering on stdin */
setvbuf(stdin, NULL, _IONBF, 0);
/* Minicom, screen, idf_monitor send CR when ENTER key is pressed */
esp_vfs_dev_uart_port_set_rx_line_endings(CONFIG_ESP_CONSOLE_UART_NUM, ESP_LINE_ENDINGS_CR);
/* Move the caret to the beginning of the next line on '\n' */
esp_vfs_dev_uart_port_set_tx_line_endings(CONFIG_ESP_CONSOLE_UART_NUM, ESP_LINE_ENDINGS_CRLF);
/* Configure UART. Note that REF_TICK is used so that the baud rate remains
* correct while APB frequency is changing in light sleep mode.
*/
const uart_config_t uart_config = {
.baud_rate = CONFIG_ESP_CONSOLE_UART_BAUDRATE,
.data_bits = UART_DATA_8_BITS,
.parity = UART_PARITY_DISABLE,
.stop_bits = UART_STOP_BITS_1,
.source_clk = UART_SCLK_REF_TICK,
};
/* Install UART driver for interrupt-driven reads and writes */
ESP_ERROR_CHECK( uart_driver_install(CONFIG_ESP_CONSOLE_UART_NUM,
256, 0, 0, NULL, 0) );
ESP_ERROR_CHECK( uart_param_config(CONFIG_ESP_CONSOLE_UART_NUM, &uart_config) );
/* Tell VFS to use UART driver */
esp_vfs_dev_uart_use_driver(CONFIG_ESP_CONSOLE_UART_NUM);
/* Initialize the console */
esp_console_config_t console_config = {
.max_cmdline_args = 8,
.max_cmdline_length = 256,
#if CONFIG_LOG_COLORS
.hint_color = atoi(LOG_COLOR_CYAN)
#endif
};
ESP_ERROR_CHECK( esp_console_init(&console_config) );
/* Configure linenoise line completion library */
/* Enable multiline editing. If not set, long commands will scroll within
* single line.
*/
linenoiseSetMultiLine(1);
/* Tell linenoise where to get command completions and hints */
linenoiseSetCompletionCallback(&esp_console_get_completion);
linenoiseSetHintsCallback((linenoiseHintsCallback*) &esp_console_get_hint);
/* Set command history size */
linenoiseHistorySetMaxLen(100);
/* Don't return empty lines */
linenoiseAllowEmpty(false);
#if CONFIG_STORE_HISTORY
/* Load command history from filesystem */
linenoiseHistoryLoad(HISTORY_PATH);
#endif
}
```
### 控制台函数注册
通过注册自己需要的命令，esp_console_cmd_register()，函数传参是一个 esp_console_cmd_t 的结构体
```c
typedef struct {
/**
* Command name. Must not be NULL, must not contain spaces.
* The pointer must be valid until the call to esp_console_deinit.
*/
const char *command;
/**
* Help text for the command, shown by help command.
* If set, the pointer must be valid until the call to esp_console_deinit.
* If not set, the command will not be listed in 'help' output.
*/
const char *help;
/**
* Hint text, usually lists possible arguments.
* If set to NULL, and 'argtable' field is non-NULL, hint will be generated
* automatically
*/
const char *hint;
/**
* Pointer to a function which implements the command.
*/
esp_console_cmd_func_t func;
/**
* Array or structure of pointers to arg_xxx structures, may be NULL.
* Used to generate hint text if 'hint' is set to NULL.
* Array/structure which this field points to must end with an arg_end.
* Only used for the duration of esp_console_cmd_register call.
*/
void *argtable;
} esp_console_cmd_t;
```
### 运行演示
可以看到输入提前注册的指令之后就能运行想对应的函数
## 结尾
控制台可以脱离仿真器，辅助用户进行代码调试和问题检测，是一个非常不错的组件
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