Cortex Challenge Team / Mbed 2 deprecated Nucleo-getc

Reception of multiple characters over UART without interrupting the program. Uses 2 input buffers.

Dependencies:   mbed

main.cpp@3:e316c5e314e1, 2015-05-12 (annotated)

Committer:
Foxnec
Date:
Tue May 12 09:31:21 2015 +0000
Revision:
3:e316c5e314e1
Parent:
2:416bbbc23e82 
Changes to comments

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dousape2 1:4486f14a88ad 1 /**********************************************************************************
dousape2 1:4486f14a88ad 2 * @file main.cpp
dousape2 1:4486f14a88ad 3 * @author Petr Dousa
dousape2 1:4486f14a88ad 4 * @version V1.00
dousape2 1:4486f14a88ad 5 * @date 22-March-2015
Foxnec 3:e316c5e314e1 6 * @brief Every single second push to serial message and read from serial
dousape2 1:4486f14a88ad 7 * Serial speed is set to 115200.
dousape2 1:4486f14a88ad 8 ***********************************************************************************/
dousape2 1:4486f14a88ad 9
dousape2 1:4486f14a88ad 10 /* Includes ----------------------------------------------------------------------*/
dousape2 0:2a0d1131965d 11 #include "mbed.h"
dousape2 0:2a0d1131965d 12
dousape2 1:4486f14a88ad 13 /* Defines -----------------------------------------------------------------------*/
dousape2 1:4486f14a88ad 14 #define buffer_size 256 // incoming buffer size
dousape2 1:4486f14a88ad 15 #define buffer_fill buffer_size+1 // number, when buffer is ready
dousape2 1:4486f14a88ad 16
dousape2 1:4486f14a88ad 17 /* Function prototypes -----------------------------------------------------------*/
dousape2 1:4486f14a88ad 18 void serialRx();
dousape2 2:416bbbc23e82 19 int serialGetBuffer(char * & data);
dousape2 0:2a0d1131965d 20
dousape2 1:4486f14a88ad 21 /* Variables ---------------------------------------------------------------------*/
Foxnec 3:e316c5e314e1 22 // additional variables for incoming data
dousape2 1:4486f14a88ad 23 char serial_buffer[buffer_size]; // buffer to save incoming data
dousape2 1:4486f14a88ad 24 char serial_buffer2[buffer_size]; // second buffer to save incoming data
dousape2 1:4486f14a88ad 25 int serial_buffer_where=0; // index array for buffer
dousape2 1:4486f14a88ad 26 int serial_buffer2_where=0; // index array for second buffer
dousape2 1:4486f14a88ad 27 bool serial_end_line = false; // searching for end line
dousape2 1:4486f14a88ad 28
dousape2 1:4486f14a88ad 29 //mbed - initialization of peripherals
dousape2 0:2a0d1131965d 30 Serial pc(SERIAL_TX, SERIAL_RX);
dousape2 0:2a0d1131965d 31 DigitalOut myled(LED1);
dousape2 0:2a0d1131965d 32
dousape2 1:4486f14a88ad 33 /* Functions----------------------------------------------------------------------*/
dousape2 0:2a0d1131965d 34
dousape2 1:4486f14a88ad 35 /*******************************************************************************
dousape2 1:4486f14a88ad 36 * Function Name : serialRx.
dousape2 2:416bbbc23e82 37 * Description : Incoming interruption fom serial. Fill two buffers with
Foxnec 3:e316c5e314e1 38 * incoming data and prepare it to serialGetBuffer.
dousape2 1:4486f14a88ad 39 * Input : None.
dousape2 1:4486f14a88ad 40 * Output : None.
dousape2 1:4486f14a88ad 41 * Return : None.
dousape2 1:4486f14a88ad 42 *******************************************************************************/
dousape2 0:2a0d1131965d 43 void serialRx()
dousape2 0:2a0d1131965d 44 {
dousape2 1:4486f14a88ad 45 while(pc.readable()) { // read all data from serial
dousape2 1:4486f14a88ad 46 char character=pc.getc(); // get a char form serial
dousape2 1:4486f14a88ad 47 if(((int)character==10 || (int)character==13) && serial_end_line) { // search for end line /r or /n
Foxnec 3:e316c5e314e1 48 serial_end_line=true; // end was find in the previous charascter, skip
dousape2 0:2a0d1131965d 49 continue;
dousape2 1:4486f14a88ad 50 } else {
dousape2 1:4486f14a88ad 51 serial_end_line=false; // clear serial_end_line flag
dousape2 1:4486f14a88ad 52 }
Foxnec 3:e316c5e314e1 53 if(serial_buffer_where!=buffer_fill && !(serial_buffer2_where != 0 && serial_buffer2_where!=buffer_fill)) {
dousape2 0:2a0d1131965d 54 serial_buffer[serial_buffer_where++]=character;
Foxnec 3:e316c5e314e1 55 if(serial_buffer_where==buffer_size) { // check if incoming data are smaller than buffer size
dousape2 1:4486f14a88ad 56 serial_buffer[buffer_size-1]='\0'; // posibility to lost data, if the incoming data are too big
dousape2 1:4486f14a88ad 57 serial_buffer_where=buffer_fill; // set index array to indicate buffer fill
dousape2 2:416bbbc23e82 58 continue;
dousape2 0:2a0d1131965d 59 }
Foxnec 3:e316c5e314e1 60 if(character==13 || character==10) { // if end of line (\r \n) is indicated, prepare the buffer to serialGetBuffer
dousape2 1:4486f14a88ad 61 serial_buffer[serial_buffer_where-1]='\0'; // set end of buffer with 0
dousape2 1:4486f14a88ad 62 serial_buffer_where=buffer_fill; // set index array to indicate buffer fill
dousape2 1:4486f14a88ad 63 serial_end_line=true; // end of line was find, set serial_end_line flag
dousape2 0:2a0d1131965d 64 }
dousape2 1:4486f14a88ad 65 } else if(serial_buffer2_where!=buffer_fill) { // same for second buffer
dousape2 0:2a0d1131965d 66 serial_buffer2[serial_buffer2_where++]=character;
dousape2 0:2a0d1131965d 67 if(serial_buffer2_where==buffer_size) {
dousape2 0:2a0d1131965d 68 serial_buffer2[buffer_size-1]='\0';
dousape2 0:2a0d1131965d 69 serial_buffer2_where=buffer_fill;
dousape2 2:416bbbc23e82 70 continue;
dousape2 0:2a0d1131965d 71 }
dousape2 0:2a0d1131965d 72 if(character==13 || character==10) {
dousape2 0:2a0d1131965d 73 serial_buffer2[serial_buffer2_where-1]='\0';
dousape2 0:2a0d1131965d 74 serial_buffer2_where=buffer_fill;
dousape2 0:2a0d1131965d 75 serial_end_line=true;
dousape2 0:2a0d1131965d 76 }
Foxnec 3:e316c5e314e1 77 } /*else { // the buffers are full and thedata are lost
dousape2 0:2a0d1131965d 78 while(!pc.writeable());
dousape2 0:2a0d1131965d 79 pc.printf("Code is too slow!\n");
dousape2 1:4486f14a88ad 80 //pc.printf("I get: \"%c\", DEC: %d\n",character,(int)character);
dousape2 0:2a0d1131965d 81 }*/
dousape2 0:2a0d1131965d 82 }
dousape2 0:2a0d1131965d 83 }
dousape2 0:2a0d1131965d 84
dousape2 1:4486f14a88ad 85 /*******************************************************************************
dousape2 1:4486f14a88ad 86 * Function Name : serialGetBuffer.
dousape2 1:4486f14a88ad 87 * Description : Timer overflow handle. Blinks the LED.
dousape2 1:4486f14a88ad 88 * Input : Char array with size buffer_size.
dousape2 1:4486f14a88ad 89 * Output : Char array with incoming data.
dousape2 1:4486f14a88ad 90 * Return : 0 - on no data, 1 - one buffer is fill, 2 -two buffers are fill (posibility to lost data)
dousape2 1:4486f14a88ad 91 *******************************************************************************/
dousape2 2:416bbbc23e82 92 int serialGetBuffer(char * & data)
dousape2 0:2a0d1131965d 93 {
dousape2 0:2a0d1131965d 94 if(serial_buffer_where==buffer_fill && serial_buffer2_where==buffer_fill) {
dousape2 2:416bbbc23e82 95 data=serial_buffer;
dousape2 2:416bbbc23e82 96 //memcpy(data, serial_buffer, strlen(serial_buffer)+1);
dousape2 0:2a0d1131965d 97 serial_buffer_where=0;
dousape2 0:2a0d1131965d 98 return 2;
dousape2 0:2a0d1131965d 99 } else if(serial_buffer2_where==buffer_fill) {
dousape2 2:416bbbc23e82 100 data=serial_buffer2;
dousape2 2:416bbbc23e82 101 //memcpy(data, serial_buffer2, strlen(serial_buffer2)+1);
dousape2 0:2a0d1131965d 102 serial_buffer2_where=0;
dousape2 0:2a0d1131965d 103 return 1;
dousape2 0:2a0d1131965d 104 } else if(serial_buffer_where==buffer_fill) {
dousape2 2:416bbbc23e82 105 data=serial_buffer;
dousape2 2:416bbbc23e82 106 //memcpy(data, serial_buffer, strlen(serial_buffer)+1);
dousape2 0:2a0d1131965d 107 serial_buffer_where=0;
dousape2 0:2a0d1131965d 108 return 1;
dousape2 0:2a0d1131965d 109 } else {
dousape2 0:2a0d1131965d 110 return 0;
dousape2 0:2a0d1131965d 111 }
dousape2 0:2a0d1131965d 112 }
dousape2 0:2a0d1131965d 113
dousape2 1:4486f14a88ad 114 /***********************************************************************************
dousape2 1:4486f14a88ad 115 * Function Name : main.
dousape2 1:4486f14a88ad 116 * Description : Main routine.
dousape2 1:4486f14a88ad 117 * Input : None.
dousape2 1:4486f14a88ad 118 * Output : None.
dousape2 1:4486f14a88ad 119 * Return : None.
dousape2 1:4486f14a88ad 120 ***********************************************************************************/
dousape2 1:4486f14a88ad 121 int main()
dousape2 1:4486f14a88ad 122 {
dousape2 1:4486f14a88ad 123 int i = 1;
dousape2 1:4486f14a88ad 124 int j = 0;
dousape2 2:416bbbc23e82 125 int k = 0;
dousape2 1:4486f14a88ad 126
Foxnec 3:e316c5e314e1 127 //array for data that are coming to user
dousape2 2:416bbbc23e82 128 char * prijata_data;
dousape2 1:4486f14a88ad 129
Foxnec 3:e316c5e314e1 130 pc.baud(115200); // set serial speed to 115200
Foxnec 3:e316c5e314e1 131 pc.attach(&serialRx,Serial::RxIrq); // attach serialRx to reception interrupt
dousape2 1:4486f14a88ad 132 pc.printf("Hello World !\n");
dousape2 1:4486f14a88ad 133
dousape2 1:4486f14a88ad 134 while(1) {
Foxnec 3:e316c5e314e1 135 wait_ms(10); // wait 1 second
dousape2 1:4486f14a88ad 136 if(serialGetBuffer(prijata_data)) { // get char array from serial
dousape2 1:4486f14a88ad 137 sscanf (prijata_data,"%d",&j); // sscanf for searching integer
dousape2 1:4486f14a88ad 138 pc.printf("From PC:%d.\n" ,j); // write to serial incoming integer
dousape2 1:4486f14a88ad 139 }
dousape2 2:416bbbc23e82 140
dousape2 2:416bbbc23e82 141 k++;
dousape2 2:416bbbc23e82 142
dousape2 2:416bbbc23e82 143 if (k>=100) {
Foxnec 3:e316c5e314e1 144 pc.printf("This program runs since %d seconds.\n", i++); // write some string to serial
dousape2 2:416bbbc23e82 145
dousape2 2:416bbbc23e82 146 myled = !myled; // blink LED
dousape2 2:416bbbc23e82 147
dousape2 2:416bbbc23e82 148 k=0;
dousape2 2:416bbbc23e82 149 }
dousape2 1:4486f14a88ad 150 }
dousape2 1:4486f14a88ad 151 }
dousape2 1:4486f14a88ad 152