我正在尝试使用UART AT COMMAND 4G模块,并且正在尝试设计工作流程图作为其状态机。我有一个问题
这是我的初始状态:
#define STATE_INIT 0
#define STATE_CONNECTED 1
#define STATE_DISCONNECTED 2
#define STATE_RETRY_CONNECT 3
#define STATE_FAILURE 4
#define STATE_HTTP_POST 5
#define STATE_HTTP_GET 6
#define STATE_HTTP_POST_RETRY 7
#define STATE_HTTP_POST_SUCCESS 8
#define STATE_HTTP_GET_RETRY 9
#define STATE_HTTP_GET_SUCCESS 10
#define STATE_CHECK_CONNECTIVITY 11
#define SIM_STATUS_ERROR 12
#define SIM_STATUS_READY 13
#define SIM_STATUS_LOCKED 14
#define REG_STATUS_UNREGISTERED 15
#define REG_STATUS_SEARCHING 16
#define REG_STATUS_DENIED 17
#define REG_STATUS_OK 18
#define REG_STATUS_HOME 19
#define REG_STATUS_ROAMING 20
#define REG_STATUS_UNKNOWN 21
uint8_t current_state;
void processMessage(char *msg) {
}
void sendCmd(char *cmd) {
strcpy(UART_Out_Buffer, cmd);
UART_Out_Cnt = strlen(cmd);
}
void Init_State(void) {
current_state = STATE_INIT;
sendCmd("AT+CGSOCKCONT=1,""\"IP""\",""\"A1.net""\"");
sendCmd("AT+CSOCKAUTH=1,1,""\"ppp""\",""\"[email protected]""\"");
sendCmd("AT+CHTTPSOPSE=""\"ipdb-eu1.com""\",443""\"");
}
这里,当我们发送命令时,应处理响应。
void process_uart(void)
{
uint16_t uartBufPos = 0;
char line[UART_BUFFER_SIZE];
line[0] = '\0';
uint16_t linePos = 0;
while (UART_Buffer[uartBufPos] != '\0')
{
if (UART_Buffer[uartBufPos] == '\n')
{
line[linePos] = '\0';
processMessage(line);
linePos = 0;
}
else
{
line[linePos] = UART_Buffer[uartBufPos];
linePos++;
if (linePos == UART_BUFFER_SIZE)
{
linePos = 0;
}
}
uartBufPos++;
if (uartBufPos == UART_BUFFER_SIZE)
{
uartBufPos = 0;
}
}
if (UART_Out_Cnt > 0)
{
HAL_UART_Transmit(&huart2, (uint8_t *)UART_Out_Buffer, UART_Out_Cnt, 100);
UART_Out_Cnt = 0;
}
}
跟随答案:我已经做到了:
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
if (htim->Instance == TIM2)
{
start_processing = true;
isSynced = true;
if (waitreply > 1)
{
waitreply--;
HAL_UART_Receive_DMA(&huart2, DMA_RX_Buffer, DMA_RX_BUFFER_SIZE);
uint16_t uartBufPos = 0;
uint16_t linePos = 0;
while (DMA_RX_Buffer[uartBufPos] != '\0')
{
if (DMA_RX_Buffer[uartBufPos] == '\n')
{
wait_reply = -1;
}
else
{
if (uartBufPos == DMA_RX_BUFFER_SIZE)
{
uartBufPos = 0;
}
uartBufPos++;
}
}
}
}
}
进程状态机:
void process_state_machine()
{
uint8_t timeout = 0;
switch (current_state)
{
case STATE_INIT:
if (wait_reply == 0)
{
// just entered this state, send command
HAL_UART_Transmit(&huart2, "AT+CGSOCKCONT=1,"
"\"IP"
"\","
"\"A1.net"
"\"\r\n",
strlen("AT+CGSOCKCONT=1,"
"\"IP"
"\","
"\"A1.net"
"\"\r\n"),
100);
wait_reply = 2;
}
else
{
// reply, or timeout
if (wait_reply == 1)
{
// timeout, retry
timeout = 0; // this will re-enter this state
}
if (wait_reply == -1)
{
// analyze reply, may be change state
wait_reply = 0;
timeout = 1;
current_state = STATE_CONNECTED;
}
}
break;
这并不容易,但是您可以使用状态机来完成;但是该状态机必须至少具有两个级别。这是因为当您向调制解调器发送命令时,会花费一些时间。还需要更多时间来等待响应。只要您有两个或至少一个用于调制解调器通信的循环缓冲区,就可以使用单个计时器(一个简单的变量)完成此操作。
及时调用状态机,例如每1/100秒。计时器变量称为waitreply。伪代码是这样的:
statemachine:
if (waitreply > 1):
waitreply--;
read characters from modem (from circular buffer)
is the read message complete? (ends with CR-LF?)
no:
(fall to the rest of the routine)
yes:
is this out-of-band data?
yes:
put it aside and ignore
no:
waitreply = -1;
剩余部分是一个switch语句,每个状态一个案例。每个状态均分为两部分:
case SEND_AT:
if (waitreply == 0) {
// just entered this state, send command
send command
waitreply = some_timeout
} else {
// reply, or timeout
if (waitreply == 1) {
// timeout, retry
waitreply = 0; // this will re-enter this state
}
if (waitreply == -1) {
// analyze reply, may be change state
waitreply = 0;
STATE = SEND_ATI;
}
}
break;
这只是一个主意,希望对您有所帮助。
=====注释后编辑=====
如上面的代码所示,waitreply变量实现了第二级状态机。如果waitreply == 0,则表示没有事务在进行中:可以发送命令;否则,可以发送命令。如果==-1,则来自调制解调器的答复准备好被当前的“状态”读取;否则,状态机就在等待。因此,可以将(waitreply> 0)的测试移至该函数的开头,如果满足,则只需过早退出该函数。但这似乎没有太大的改善。
关于OP的问题:
伪代码用法如下:
int waitreply;枚举等等void statemachine(void);
void main(void){waitreply = 0; //已由C运行时清零状态= ST_SENDAT; //看看调制解调器是否还活着做{如果(timer_expired){// 1/100秒过去statemachine();start_timer();}}}
void statemachine(void){//序言... modem_replay包含来自调制解调器的回复开关(状态){案例ST_SENDAT:如果(waitreply == 0){//刚进入此状态,发送命令send_to_modem(“ AT” CR LF);waitreply = 200; // 2秒}其他{//回复或超时如果(waitreply == 1){//超时,重试waitreply = 0; //这将重新进入此状态}如果(waitreply == -1){//分析回复,可能是改变状态waitreply = 0;如果(0 == strcmp(modem_reply,“ OK”))STATE = SEND_ATI; //另一个状态,以从调制解调器获取信息//否则将永远重新进入同一状态}}打破;} //切换结束} // func statemachine
我再说一遍,这只是一个可以很好控制的想法,但仅此而已。