COM: Transformed to use normal buffers but in kind of a ringbuffer way.

There are now fixed buffers which are organized in a ringbuffer. This makes
it easier to access data stored in the buffers, also receiving packets is
now way faster with reduced risk of sync problems.

avr/main.asm

@@ -19,8 +19,6 @@
 
 .equ COM_BIT_LENGTH      = 52000 ; 104000=9600, 52000=19200, 26000=38400
 
-.equ COM_RINGBUFFER_SIZE = 32    ; 32 bytes for now
-
 .equ COM_DDR_DATA        = DDRA
 .equ COM_PORT_DATA       = PORTA
 .equ COM_PIN_DATA        = PINA
@@ -52,7 +50,7 @@
 
 	rjmp main ; Reset vector
 	reti ; EXT_INT0
-	reti ; PCI0
+	rjmp comIsrPcint0 ; PCI0
 	reti ; PCI1
 	reti ; WATCHDOG
 	reti ; ICP1
@@ -74,7 +72,6 @@
 ; includes
 
 .include "utils.asm"
-.include "ringbuffer.asm"
 .include "timer.asm"
 .include "led.asm"
 .include "com.asm"
@@ -262,14 +259,13 @@ onEverySecond:
 ; USED: depending on called routines
 
 onEvery10s:
-  in r15, SREG ; debug
-  cli
-  push r15
-    ldi r17, 219
-    rcall COM_EnqueuePing
-;    rcall comHandleNextPacketInRingbuffer
-  pop r15
-  out SREG, r15
+;  in r15, SREG ; debug
+;  cli
+;  push r15
+;    ldi r16, 219
+;    rcall COM_EnqueuePing
+;  pop r15
+;  out SREG, r15
   ret
 
 
@@ -286,8 +282,6 @@ onEvery10s:
 ; USED: depending on called routines
 
 onEveryMinute:
-    sbi DDRA, PORTA2 ; debug
-    sbi PINA, PORTA2 ; debug (toggle)
   ret
 
 
@@ -299,13 +293,14 @@ onEveryMinute:
 ;
 ; The packet will be removed from buffer in any case after return from this call.
 ; IN:
-; - R18: pos of packet in ringbuffer
-; - Y  : pointer to ringbuffer
+; - Y  : pointer to received buffer
 ; OUT:
 ; - CFLAG: set if handled, cleared otherwise
 ; USED: depending on called routines
 
 onPacketReceived:
+ sbi DDRA, PORTA2 ; debug
+ sbi PINA, PORTA2 ; debug (toggle)
   clc               ; not handled
   ret
 
@@ -316,33 +311,42 @@ onPacketReceived:
 
 
 debugSendByte:
-  in r15, SREG ; debug
-  cli
+  push r15
+    in r15, SREG ; debug
+    cli
+    push r17
+      push r22
+        ldi r17, 8
+        sbi DDRA, PORTA2 ; debug
+        
+        cbi PORTA, PORTA2 ; debug (on)
+        Utils_WaitNanoSecs 100000, 0, r22 ; start with 2t low
 
-  ldi r17, 8
-  sbi DDRA, PORTA2 ; debug
-
-  cbi PORTA, PORTA2 ; debug (on)
-  Utils_WaitNanoSecs 200000, 0, r22 ; start with 2t low
-
-debugSendByte_loop:
-  lsr r16
-  brcs debugSendByte_sendLow
-  cbi PORTA, PORTA2 ; debug (on)
-  rjmp debugSendByte_wait
-debugSendByte_sendLow:
-  sbi PORTA, PORTA2 ; debug (off)
-
-debugSendByte_wait:
-  Utils_WaitNanoSecs 100000, 0, r22
-  dec r17
-  brne debugSendByte_loop
-
-  cbi PORTA, PORTA2 ; debug (on)
-  Utils_WaitNanoSecs 200000, 0, r22 ; end with 2t low
-  sbi PORTA, PORTA2 ; debug (off)
-
-
-  out SREG, r15
+        sbi PORTA, PORTA2 ; debug (off)
+        nop
+        nop
+        cbi PORTA, PORTA2 ; debug (on)
+        Utils_WaitNanoSecs 100000, 0, r22 ; start with 2t low
+        
+        debugSendByte_loop:
+        lsr r16
+        brcs debugSendByte_sendLow
+        cbi PORTA, PORTA2 ; debug (on)
+        rjmp debugSendByte_wait
+        debugSendByte_sendLow:
+        sbi PORTA, PORTA2 ; debug (off)
+        
+        debugSendByte_wait:
+        Utils_WaitNanoSecs 100000, 0, r22
+        dec r17
+        brne debugSendByte_loop
+        
+        cbi PORTA, PORTA2 ; debug (on)
+        Utils_WaitNanoSecs 200000, 0, r22 ; end with 2t low
+        sbi PORTA, PORTA2 ; debug (off)
+      pop r22
+    pop r17
+    out SREG, r15
+  pop r15
   ret