Revision 0:32af38c93bc6, committed 2020-03-17

Comitter:

villemejane

Date:

Tue Mar 17 07:07:00 2020 +0000

Commit message:

Example of communication between a computer and a Nucleo board - RS232/USB - A terminal or interface is required

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Mar 17 07:07:00 2020 +0000
@@ -0,0 +1,184 @@
+#include "mbed.h"
+
+#define     ETAT_STOP           0
+#define     ETAT_WAIT_PARAM     1
+#define     ETAT_WAIT_PARAM_N   11
+#define     ETAT_WAIT_PARAM_F   12
+#define     ETAT_WAIT_PARAM_S   13
+#define     ETAT_WAIT_GO        2
+#define     ETAT_ACQUIRING      3
+#define     ETAT_SENDING_DATA   4
+
+// inputs and outputs configuration
+DigitalOut  debug_led(LED1);
+Serial      rs232(USBTX, USBRX);
+AnalogIn    can_input(A0);
+InterruptIn sync_input(D10);
+
+Ticker tictoc;
+Ticker blinky;
+
+// System functions
+void ISR_sync(void);
+void convert_signal(void);
+void ISR_get_data(void);
+void ISR_send_data(void);
+void TIK_blink_led(void);
+
+// System variables
+int i, pdix, temp;
+char etat = 0;
+char data_received, i_received;
+char tab_received[10] = {0};
+
+// Acquisition parameters
+int     number_points;
+int     frequency;
+char    sync = 0;
+
+// Acquisition data
+int     i_data;
+int     tab_data[10000];
+
+// Main function
+int main() {
+    number_points = 0;
+    frequency = 0;
+    i_received = 0;
+    etat = ETAT_STOP;
+    data_received = '0';
+    debug_led = 0;
+    i_data = 0;
+    rs232.baud(115200);
+    rs232.attach(&ISR_get_data);
+    sync_input.rise(&ISR_sync);
+    while(1) {
+        switch(etat){
+
+            case ETAT_SENDING_DATA :
+                rs232.putc('d');
+                blinky.detach();
+                tictoc.detach();
+                debug_led = 1;
+                for(i = 0; i < number_points; i++){
+                    rs232.printf("[%d;%d]", i, tab_data[i]);
+                }
+                etat = ETAT_STOP;
+                debug_led = 0;
+                break;
+            default :
+                temp = 0;
+        }
+    }
+}
+
+void ISR_sync(void){
+    if((etat == ETAT_ACQUIRING) && (sync == 1)){
+        float period = 1.0/frequency;
+        tictoc.attach(&convert_signal,period);
+    }
+} 
+
+void convert_signal(void){
+    tab_data[i_data] = can_input.read_u16() >> 4;
+    i_data++;
+    if(i_data == number_points){
+        etat = ETAT_SENDING_DATA;
+        tictoc.detach();
+    }
+}
+
+void ISR_send_data(){
+    i++;
+    rs232.printf("i=%d:\r\n", i);
+}
+
+void ISR_get_data(){
+    data_received = rs232.getc();
+    if((data_received == 'U') && (etat != ETAT_STOP) && (etat != ETAT_ACQUIRING) && (etat != ETAT_SENDING_DATA)){   // UPDATE parameters
+        rs232.putc('u');
+        etat = ETAT_WAIT_PARAM;
+        blinky.attach(&TIK_blink_led, 0.5);
+    }
+    
+    switch(etat){
+        case ETAT_STOP :
+            if(data_received == 'a'){
+                etat = ETAT_WAIT_PARAM;
+                rs232.putc('o');
+                blinky.attach(&TIK_blink_led, 0.5);
+            }            
+            break;
+        case ETAT_WAIT_PARAM :
+            if(data_received == 'n'){
+                rs232.putc('n');
+                etat = ETAT_WAIT_PARAM_N;
+                i_received = 0;
+            }
+            break;    
+        case ETAT_WAIT_PARAM_N :
+            if(data_received == 'f'){
+                rs232.putc('f');
+                // param number of points
+                number_points = 0;
+                pdix = 1;
+                for(i = i_received-1; i >= 0; i--){
+                    number_points += (tab_received[i] - '0') * pdix;
+                    pdix = pdix * 10;
+                }
+                // next state
+                etat = ETAT_WAIT_PARAM_F;
+                i_received = 0;
+            }
+            else{
+                tab_received[i_received] = data_received;
+                i_received++;
+            }
+            break;    
+        case ETAT_WAIT_PARAM_F :
+            if(data_received == 's'){
+                rs232.putc('s');
+                // param frequency
+                frequency = 0;
+                pdix = 1;
+                for(i = i_received-1; i >= 0; i--){
+                    frequency += (tab_received[i] - '0') * pdix;
+                    pdix = pdix * 10;
+                }
+                // next state
+                etat = ETAT_WAIT_PARAM_S;
+                i_received = 0;
+            }
+            else{
+                tab_received[i_received] = data_received;
+                i_received++;
+            }
+            break; 
+        case ETAT_WAIT_PARAM_S :
+            // param synchro
+            sync = data_received - '0';
+            // next state
+            etat = ETAT_WAIT_GO;
+            i_received = 0;
+            rs232.printf("N=%d;F=%d;S=%d;",number_points, frequency, sync);
+            break; 
+        case ETAT_WAIT_GO :
+            if(data_received == 'G'){
+                etat = ETAT_ACQUIRING;
+                blinky.detach();
+                blinky.attach(&TIK_blink_led, 0.1);
+                if(sync == 0){
+                    float period = 1.0/frequency;
+                    tictoc.attach(&convert_signal,period);
+                }   
+            }
+            break;
+        default :
+            etat = ETAT_STOP;
+            debug_led = 0;
+    }
+}
+
+void TIK_blink_led(void){
+    debug_led = !debug_led;
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Tue Mar 17 07:07:00 2020 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/mbed_official/code/mbed/builds/65be27845400
\ No newline at end of file