demo3/tcl.c

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// 透传缆
#include <stdio.h>
#include <stdlib.h>
#include "MultiTimer.h"
#define CMD_TRA_MODE 0xA1
#define CMD_REC_MODE 0xA2
#define CMD_SLP_MODE 0xA3
#define CMD_WKP_MODE 0xA4
#define CMD_ACK_OK 0xAB
#define CMD_ACK_NOK 0xAF
#define MIN_TR_PERIOD_MS 1000 * 5 // 单字节最小传输时间
#define HOST_RETRY_PERIOD_MS (MIN_TR_PERIOD_MS + 1000) // 主机重试时间间隔
#define CLIENT_RETRY_PERIOD_MS (MIN_TR_PERIOD_MS + 1000 * 10) // 客户端重试时间间隔
static int devMode = HOST_MODE;
static int curMode = R_MODE;
static int tarMode = R_MODE;
static int trySwt = 0; // 是否尝试切换到发送模式
static int tarDevMode = R_MODE; // 目标端工作模式
static MultiTimer retryTimer, timeoutTimer; // 重试定时器、超时定时器
/// @brief 主从模式,主机拥有更高优先级
enum
{
HOST_MODE = 0,
CLIENT_MODE
};
/// @brief 工作模式,收、发、休眠、唤醒
enum
{
T_MODE = 0,
R_MODE,
SLEEP_MODE,
WORK_MODE
};
// 设置GPIO电平
void setGpioLevel(int gpio, int level)
{
// 设置GPIO电平
}
/// @brief 初始化工作模式仅设置对应GPIO电平
/// @param cfg
void initWorkMode(int cfg)
{
switch (cfg)
{
case T_MODE:
/* code */
break;
case R_MODE:
/* code */
break;
case SLEEP_MODE:
/* code */
break;
case WORK_MODE:
/* code */
break;
default:
break;
}
}
/// @brief 通过透传缆串口发送数据
/// @param data 待发送数据
/// @param len 待发送数据长度
void lineTransmitData(uint8_t *data, uint8_t len)
{
// 发送数据前后需初始化为发送模式
initWorkMode(T_MODE);
// 发送数据
// 发送完毕后需恢复为接收模式
initWorkMode(R_MODE);
}
/// @brief 通过用户串口发送数据
/// @param data 待发送数据
/// @param len 待发送数据长度
void userTransmitData(uint8_t *data, uint8_t len)
{
}
/// @brief 切换为接收模式
void switchToRecMode()
{
lineTransmitData(CMD_REC_MODE, 1);
// 不需要ACK
curMode = R_MODE;
tarMode = R_MODE;
}
/// @brief 切换为发送模式
//
// 以ACK回复判断是否切换成功
// 切换失败则定时重试
void switchToTraMode()
{
// tarMode = T_MODE;
lineTransmitData(CMD_REC_MODE, 1);
// 接收ACK
uint8_t ack[] = {};
uint8_t len = 0;
recvData(ack, len, 2000); // 阻塞等待
if (len == 1 && ack[0] == CMD_ACK_OK)
{
// 切换发送模式成功
curMode = T_MODE;
tarMode = R_MODE;
// initWorkMode(T_MODE);
// return 0;
}
else
{
// 切换发送模式失败
// 恢复为接收模式
switchToRecMode();
tarMode = T_MODE; // 触发定时重试
}
}
uint64_t getPlatformTicks(void)
{
/* Platform-specific implementation */
}
// Callback functions for the timers
void retryTimerCallback(MultiTimer *timer, void *userData)
{
if (tarDevMode == R_MODE && curMode == R_MODE && tarMode == T_MODE) // 两端为收方可发起请求
{
trySwt = 1;
}
printf("Timer 1 fired at %lu ms\n", getPlatformTicks());
}
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/// @brief 计算异或XOR校验
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/// @param data
/// @param len
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/// @return 校验结果
uint8_t bccCRC(uint8_t *data, uint8_t len)
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{
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uint8_t crc = 0;
for (int i = 0; i < len; i++)
{
crc ^= data[i];
}
return crc;
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}
/// @brief 检查数据有效性
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/// @param data 待校验数据
/// @param len 数据长度
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/// @return 0->有效 1->帧头无效 2->帧尾无效 3->校验位无效
int chkDataValid(uint8_t *data, uint8_t len)
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{
// 按帧发送数据
// 判断帧的完整性及校验位
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if (data[0] != 0x5A || data[1] != 0xA5) // 帧头校验
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{
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return 1;
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}
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if (data[len - 1] != 0xED) // 帧尾校验
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{
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return 2;
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}
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if (bccCRC(data + 2, len - 4) != data[len - 2]) // 校验位校验
{
return 3;
}
return 0;
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}
/// @brief 用户接口接收数据回调
/// @param data
/// @param len
void userRecDataCallback(uint8_t *data, uint8_t len)
{
if (len == 1)
{
switch (data[0])
{
case CMD_REC_MODE:
switchToRecMode();
break;
case CMD_TRA_MODE:
if (curMode == R_MODE && tarDevMode == R_MODE)
{
switchToTraMode();
// ok
}
break;
case CMD_SLP_MODE:
initWorkMode(SLEEP_MODE);
break;
case CMD_WKP_MODE:
initWorkMode(WORK_MODE);
break;
default:
break;
}
}
else
{
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if (chkDataValid(data, len))
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{
lineTransmitData(data, len);
}
}
}
/// @brief 透传缆接收数据回调
/// @param data
/// @param len
void lineRecCallback(uint8_t *data, uint8_t len)
{
if (len == 1)
{
switch (data[0])
{
case CMD_REC_MODE:
lineTransmitData(CMD_ACK_OK, 1);
tarDevMode = R_MODE;
break;
case CMD_TRA_MODE: // 对端请求切换为发送模式
if (curMode == R_MODE)
{
lineTransmitData(CMD_ACK_OK, 1);
tarDevMode = T_MODE;
}
else
{
lineTransmitData(CMD_ACK_NOK, 1);
}
break;
default:
lineTransmitData(CMD_ACK_NOK, 1);
break;
}
}
else
{
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if (chkDataValid(data, len))
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{
userTransmitData(data, len);
}
}
}
/// @brief
void handleTR()
{
// 初始化外设
uint8_t retryTime = 100;
if (devMode == HOST_MODE)
{
// 间隔0.1s
retryTime = 100;
}
else
{
retryTime = 1000;
}
// 初始化MultiTimer
multiTimerInstall(getPlatformTicks);
// 定时器始终开启
multiTimerStart(&retryTimer, retryTime, retryTimerCallback, NULL); // Start timer
while (1)
{
multiTimerYield();
if (trySwt)
{
trySwt = 0; // clear flag
switchToTraMode();
multiTimerStart(&retryTimer, retryTime, retryTimerCallback, NULL); // always restart timer
}
}
}
void main()
{
handleTR();
}