命令解释器的设计及实现

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• • 1 命令解释器的设计及实现

1 命令解释器的设计及实现

命令解释器的实现较为简单，流程简单归纳为：

• 打印命令提示符
• 读取一行字符串
• 解析命令，执行操作，必要时打印结果

主要实现了如下命令：

实现代码如下：
cli.h：

/*** @brief 命令解释器设计* @details* @author 01课堂 李述铜 http://01ketang.cc* @date 2017-06-01* @version 1.0* @copyright 版权所有，禁止用于商业用途*/ #ifndef CLI_H #define CLI_H#define CLI_TASK_PRIO 0 #define CLI_CMD_PROMATE_SIZE 64 #define CLI_TASK_ENV_SIZE 512 #define CLI_CMD_HISTORY_SIZE 1024 #define CLI_CMD_BUFFER_SIZE 128void CLIInit (void);#endif //CLI_H

cli.c：

/*** @brief 命令解释器设计* @details* @author 01课堂 李述铜 http://01ketang.cc* @date 2017-06-01* @version 1.0* @copyright 版权所有，禁止用于商业用途*/ #include <string.h> #include "tinyOS.h" #include "cli.h" #include "uart.h" #include "extio.h" #include "WaveGen.h"#define TERMINAL_BS 0x08 #define TERMINAL_SPACE ' ' #define TERMINAL_CR '\r' #define TERMINAL_LF '\n' #define TERMINAL_TAB '\t'// 空白字符 static const char spaceCh[] = {TERMINAL_SPACE, TERMINAL_CR, TERMINAL_LF, TERMINAL_TAB, '\0'}; static const char * unknownPinMsg = "Unknown Pin\r\n"; static const char * unknownCmdMsg = "Unknown Command!\r\n"; static const char * noEnoughParamMsg = "No Enough Param!\r\n";// 任务相关 static tTaskStack cliTaskEnv[CLI_TASK_ENV_SIZE]; // 任务1的堆栈空间 static tTask cliTask;// 命令行提示缓冲区 static char promoteBuffer[CLI_CMD_PROMATE_SIZE];/*** 显示消息*/ static void showMsg (const char * msg) {UartWrite(msg, strlen(msg)); }/*** 输出显示字符* @param ch*/ static void showCh (const char ch) {UartWrite(&ch, 1); }/*** 显示提示符*/ static void showPromote (void) {UartWrite(promoteBuffer, strlen(promoteBuffer)); }/*** 更改提示符*/ static void setPromote (const char * newPromote) {strncpy(promoteBuffer, newPromote, sizeof(promoteBuffer));promoteBuffer[sizeof(promoteBuffer) - 1] = '\0'; }/*** 提示符修改命令*/ static void promoteCmd (void) {char * promote = strtok(NULL, spaceCh);if (promote == NULL) {showMsg(noEnoughParamMsg);return;}setPromote(promote); }/*** 将引脚名转换为内部序号* @param pinCh* @return*/ static ExtIOPin convertPinNum (char * pinCh) {ExtIOPin pinNum;if (pinCh == NULL) {return ExtIOPinEnd;}pinNum = (ExtIOPin)(*pinCh - '0');if (pinNum >= ExtIOPinEnd) {return ExtIOPinEnd;}return pinNum; }/*** 外部IO命令解析*/ static void extioCmd () {char * type = strtok(NULL, spaceCh);if (type == NULL) {showMsg(noEnoughParamMsg);return;}if (strstr(type, "get")) { // 命令extio get pinExtIOPin pin;ExtIOState state;pin = convertPinNum(strtok(NULL, spaceCh));if (pin == ExtIOPinEnd) {showMsg(unknownPinMsg);return;}state = ExtIOGetState(pin);showMsg((state == ExtIOHigh) ? "1\r\n" : "0\r\n");} else if (strstr(type, "set")) { // 命令extio set pin valueExtIOPin pin;char * value;pin = convertPinNum(strtok(NULL, spaceCh));if (pin == ExtIOPinEnd) {showMsg(unknownPinMsg);return;}value = strtok(NULL, spaceCh);if (value == NULL) {showMsg(noEnoughParamMsg);return;}ExtIOSetState(pin, *value == '0' ? ExtIOLow : ExtIOHigh);} else if (strstr(type, "dir")) { // 命令extio dir pin in/outExtIOPin pin;char *outType;pin = convertPinNum(strtok(NULL, spaceCh));if (pin == ExtIOPinEnd) {showMsg(unknownPinMsg);return;}outType = strtok(NULL, spaceCh);if (outType == NULL) {showMsg(noEnoughParamMsg);return;}ExtIOSetDir(pin, strstr(outType, "in") ? 1 : 0);} else {showMsg(noEnoughParamMsg);} }/*** 波形输出命令解析*/ static void waveCmd () {char *type = strtok(NULL, spaceCh);if (type == NULL) {showMsg(noEnoughParamMsg);return;}if (strstr(type, "square")) { // 命令wave squareWaveSelectType(WaveSquare);} else if (strstr(type, "start")) {WaveStartOutput();} else if (strstr(type, "stop")) {WaveStopOutput();} else {showMsg(noEnoughParamMsg);} }/*** 未知命令处理*/ static void unknowCmd (void) {showMsg(unknownCmdMsg); }/*** 读取一行数据，如果命令超过则截断*/ static void readLine (char * buffer, uint32_t maxLen) {uint32_t index = 0;while (index < maxLen) {char ch;UartRead(&ch, 1);switch (ch) {case TERMINAL_BS: // 退格键if (index > 0) {buffer[index--] = '\0';showCh(TERMINAL_BS);showCh(TERMINAL_SPACE);showCh(TERMINAL_BS);}break;case TERMINAL_CR:showCh(TERMINAL_LF);default:showCh(ch);buffer[index++] = ch;if ((ch == '\n') || (ch == '\r') || (index >= maxLen)) {buffer[index] = '\0';return;}break;}} }/*** 解析命令*/ static void processCmd (char * cmdLine) {char * cmdStart;// 获取开头cmdStart = strtok(cmdLine, spaceCh);if (cmdStart == NULL) {return;}// 识别命令if (strstr(cmdStart, "extio")) {extioCmd();} else if (strstr(cmdStart, "wave")) {waveCmd();} else if (strstr(cmdStart, "promote")){promoteCmd();} else {unknowCmd();} }/*** 解释器任务* @param param*/ void cliTaskEntry (void * param) {static char cmdBuffer[CLI_CMD_BUFFER_SIZE];for (;;) {showPromote();readLine(cmdBuffer, sizeof(cmdBuffer));processCmd(cmdBuffer);} }/*** 命令解释器设计*/ void CLIInit (void) {strcpy(promoteBuffer, ">>");tTaskInit(&cliTask, cliTaskEntry, (void *) 0x0, CLI_TASK_PRIO, cliTaskEnv, sizeof(cliTaskEnv)); }

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