Tomas Hyhlík / Mbed OS Nucleo_serial

Turns on and of LED depending on received serial commnad "on" or "off"

main.cpp@4:5ac470115649, 2018-04-08 (annotated)

Committer:
hyhlik
Date:
Sun Apr 08 14:49:52 2018 +0000
Revision:
4:5ac470115649
Parent:
2:08c13f9a3d5c 
Demonstration of serial communication

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bcostm 0:028fac66239d 1 #include "mbed.h"
bcostm 1:e9d1c42a73ae 2
bcostm 0:028fac66239d 3 Serial pc(SERIAL_TX, SERIAL_RX);
hyhlik 4:5ac470115649 4 DigitalOut led01(LED1);
bcostm 2:08c13f9a3d5c 5
hyhlik 4:5ac470115649 6 int i; // for cycles
hyhlik 4:5ac470115649 7 char cmd_on[] = "on";
hyhlik 4:5ac470115649 8 char cmd_off[] = "off";
hyhlik 4:5ac470115649 9
hyhlik 4:5ac470115649 10 char *getCmd();
hyhlik 4:5ac470115649 11 void processCmd(char *cmd);
hyhlik 4:5ac470115649 12
hyhlik 4:5ac470115649 13 Thread t1;
bcostm 2:08c13f9a3d5c 14
hyhlik 4:5ac470115649 15 ///////////////////////////////////////////////////////////////////////////////
hyhlik 4:5ac470115649 16 void tSerial_body()
hyhlik 4:5ac470115649 17 {
hyhlik 4:5ac470115649 18 while(1){
hyhlik 4:5ac470115649 19 if (pc.readable()) // if there is an character to read from the device
hyhlik 4:5ac470115649 20 {
hyhlik 4:5ac470115649 21 char *SerialCommand = getCmd();
hyhlik 4:5ac470115649 22 processCmd(SerialCommand);
hyhlik 4:5ac470115649 23 free(SerialCommand);
hyhlik 4:5ac470115649 24 }
hyhlik 4:5ac470115649 25 }
hyhlik 4:5ac470115649 26 }
hyhlik 4:5ac470115649 27 ///////////////////////////////////////////////////////////////////////////////
hyhlik 4:5ac470115649 28 char *getCmd()
bcostm 2:08c13f9a3d5c 29 {
hyhlik 4:5ac470115649 30 char buff[128];
hyhlik 4:5ac470115649 31 unsigned char ch;
hyhlik 4:5ac470115649 32 int buffIndex = 0;
hyhlik 4:5ac470115649 33 memset(buff, 0, sizeof(buff)); // clean the buffer
hyhlik 4:5ac470115649 34
hyhlik 4:5ac470115649 35
hyhlik 4:5ac470115649 36 char *cmd = (char*)malloc(128);
hyhlik 4:5ac470115649 37 if (!cmd)
hyhlik 4:5ac470115649 38 return NULL;
hyhlik 4:5ac470115649 39 do
hyhlik 4:5ac470115649 40 {
hyhlik 4:5ac470115649 41 ch = pc.getc(); // read it
hyhlik 4:5ac470115649 42 if (buffIndex < 128){ // just to avoid buffer overflow
hyhlik 4:5ac470115649 43 buff[buffIndex] = ch; // put it into the value array and increment the index
hyhlik 4:5ac470115649 44 buffIndex++;
hyhlik 4:5ac470115649 45 }
hyhlik 4:5ac470115649 46 }
hyhlik 4:5ac470115649 47 while (ch != '\n' && ch != '\r' );
hyhlik 4:5ac470115649 48 buff[buffIndex]='\0'; // add the end-signalling char
hyhlik 4:5ac470115649 49
hyhlik 4:5ac470115649 50 if(strlen(buff) != 0){
hyhlik 4:5ac470115649 51
hyhlik 4:5ac470115649 52 for (i = 0 ; i < sizeof(buff) ; i++){
hyhlik 4:5ac470115649 53 if (buff[i] == '\n' || buff[i] == '\r'){
hyhlik 4:5ac470115649 54 cmd[i] = '\0';
hyhlik 4:5ac470115649 55 return cmd;
hyhlik 4:5ac470115649 56 }
hyhlik 4:5ac470115649 57 cmd[i] = buff[i];
hyhlik 4:5ac470115649 58 }
hyhlik 4:5ac470115649 59 }
hyhlik 4:5ac470115649 60 return NULL;
hyhlik 4:5ac470115649 61 }
hyhlik 4:5ac470115649 62 ///////////////////////////////////////////////////////////////////////////////
hyhlik 4:5ac470115649 63 void processCmd(char *cmd)
hyhlik 4:5ac470115649 64 {
hyhlik 4:5ac470115649 65 pc.printf("rec: \"%s\"\n\r", cmd);
hyhlik 4:5ac470115649 66 if(strcmp(cmd,cmd_on) == 0){
hyhlik 4:5ac470115649 67 led01 = 1;
hyhlik 4:5ac470115649 68 pc.printf("Turning the led on.\n\r");
hyhlik 4:5ac470115649 69 } else if (strcmp(cmd,cmd_off) == 0) {
hyhlik 4:5ac470115649 70 led01 = 0;
hyhlik 4:5ac470115649 71 pc.printf("Turning the led off.\n\r");
hyhlik 4:5ac470115649 72
bcostm 2:08c13f9a3d5c 73 }
bcostm 0:028fac66239d 74 }
hyhlik 4:5ac470115649 75
hyhlik 4:5ac470115649 76 ///////////////////////////////////////////////////////////////////////////////
hyhlik 4:5ac470115649 77 int main()
hyhlik 4:5ac470115649 78 {
hyhlik 4:5ac470115649 79 t1.start(tSerial_body);
hyhlik 4:5ac470115649 80
hyhlik 4:5ac470115649 81 led01 = 1;
hyhlik 4:5ac470115649 82
hyhlik 4:5ac470115649 83 pc.printf("\n\r App started______Banik pyco\n\r");
hyhlik 4:5ac470115649 84 int counter = 1;
hyhlik 4:5ac470115649 85 while(1)
hyhlik 4:5ac470115649 86 {
hyhlik 4:5ac470115649 87 pc.printf("seconds: %d\n\r", counter++);
hyhlik 4:5ac470115649 88 wait(1);
hyhlik 4:5ac470115649 89 }
hyhlik 4:5ac470115649 90 }