christian b / 4dGENIE

Mbed 4dGenie class

Dependents:   Genie_Test 039847382-S3_DS1621_and_LCD_V1

This is a work in progress.

4dGenie class to use with 4dLCD screens that are using the genie environment.

There are still some rare occasions where the 4dLCD might crash, for now i have no solution to this except doing a reset of the 4dLCD.

Please make sure to have the most up to date PmmC loaded on the screen.

usage example :

Mbed4dGenie test program

#include "mbed.h"
#include "mbed_genie.h"

DigitalOut myled(LED1);
/*
    The Mbed4dGenie class requires 3 parameters
    1 - Tx pin
    2 - Rx pin
    3 - Reset pin
*/
Mbed4dGenie lcd4d(PTE0,PTE1,PTB9);



int main() {
    int temp = 0;
printf("Mbed Genie demo \n\r");
lcd4d.Start();


 /*
 for example, in this loop we increment the thermometer0 object from 0 to 100
 */
 
    while(1) {
        if(temp >= 100)
        {
            temp = -1;
        }
        else
        {
            temp++;
        }

        lcd4d.genieWriteObject(GENIE_OBJ_LED_DIGITS,1,temp);

        myled = 1;
        wait(0.05);
        myled = 0;
        wait(0.05);
    }
}

Diff: mbed_genie.cpp

Revision:
8:b5ba0df2d0db
Parent:
7:6edb20845684
Child:
9:b74deaac80f9
--- a/mbed_genie.cpp	Sat Jul 05 15:11:57 2014 +0000
+++ b/mbed_genie.cpp	Sun Jul 06 17:22:32 2014 +0000
@@ -7,6 +7,7 @@
     _reset = 0;
     _screen.baud(9600);
     _genieUserHandler = NULL;
+    RxStateTimeoutErrors = 0;
 }
 void Mbed4dGenie::Start()
 {
@@ -44,10 +45,10 @@
             }   
             else if(data == GENIE_REPORT_OBJ || data == GENIE_REPORT_EVENT)
             {
+                RxMaxTimeout = _t.read_ms() + RESYNC_PERIOD;
                 checksum = data;
                 rx_data[rxframe_count++] = data;
-                state = CommInProgress; 
-                LastResponse = NO_RESPONSE;             
+                state = CommInProgress;              
             }                     
             break;
         
@@ -148,7 +149,9 @@
     _screen.putc(index) ;              checksum ^= index ; 
     _screen.putc(checksum) ;
         
-    return  0;//Mbed4dGenie::WaitForAnswer();
+    //Here we dont wiat for a typical answer
+    //The screen will respond with an NACK if the command was not understood, otherwise it will send a report object frame    
+    return  WaitForReadAnswer();
 }
 void Mbed4dGenie::writec(char data)
 {
@@ -156,15 +159,47 @@
 }
 bool Mbed4dGenie::WaitForIdle()
 {
+    if(state != CommIdle)
+    {
+        long timeout = _t.read_ms() + TIMEOUT_PERIOD;
+        long timerReading = 0;
+        if(_t.read_ms() >= RxMaxTimeout)
+        {
+            Reset();
+            RxStateTimeoutErrors++;
+        }
+        while(timerReading < timeout && state != CommIdle)
+        {
+            timerReading = _t.read_ms();
+        }
+        LastResponse = 0;
+        return (timerReading >= timeout);
+    }
+    
+    return false;    
+}
+
+int8_t Mbed4dGenie::WaitForReadAnswer()
+{
     long timeout = _t.read_ms() + TIMEOUT_PERIOD;
     long timerReading = 0;
-    
-    while(timerReading < timeout && state != CommIdle)
+    while(state == CommIdle && LastResponse != ERROR_NAK && timerReading < timeout)
     {
         timerReading = _t.read_ms();
     }
-    LastResponse = 0;
-    return (timerReading >= timeout);
+    if(LastResponse == ERROR_NAK)//check if the screen returned a NACK
+    {
+        LastResponse = NO_RESPONSE;
+        return ERROR_NAK;
+    }
+    else if(LastResponse >= timeout) //check if we timed out while waiting for response
+    {   
+        LastResponse = NO_RESPONSE;
+        return ERROR_TIMEOUT;
+    }
+    //if we get here it means we didnt timeout and the screen did accept the command
+    LastResponse = NO_RESPONSE;
+    return ERROR_NONE;
 }
 
 int8_t Mbed4dGenie::WaitForAnswer()
@@ -179,12 +214,15 @@
            
     if(LastResponse == ERROR_NAK)
     {
-        return ERROR_NONE;
+        LastResponse = NO_RESPONSE;
+        return ERROR_NAK;
     }
     else if(LastResponse >= timeout)
     {   
+        LastResponse = NO_RESPONSE;
         return ERROR_TIMEOUT;
     }
+    LastResponse = NO_RESPONSE;
     return ERROR_NONE;
 }