reworked com stack.

- prepared for use of CRC8
- organized code in more files
- recv stats message now contains crc errors and io errors

avr/comproto_values.asm

@@ -0,0 +1,60 @@
+
+; ***************************************************************************
+; code
+
+.cseg
+
+
+; ---------------------------------------------------------------------------
+; Enqueue a VALUE packet.
+;
+; IN:
+; - R16: destination address
+; - R17: value id
+; - R19:R18: value
+; - R21:R20: denom (e.g. 100, meaning value must be divided by 100)
+; - R22: value type
+; OUT:
+; - CFLAG: set if okay, clear otherwise
+; MODIFIED REGS: R6, R7, R8, R9, R10, R11, R12, R16, R17, X, Y (R3, R4, R15, R16, R17, R18, R19, R20, R21)
+
+CPRO_EnqueueValue:
+  mov r6, r16
+  mov r7, r17
+  mov r8, r18
+  mov r9, r19
+  mov r10, r20
+  mov r11, r21
+  mov r12, r22
+
+  rcall COM_AllocBufferAndGetXY ; (r16, r17, r21)
+  brcc CPRO_EnqueueValue_error
+
+  push xh
+    push xl
+      mov r16, r6
+      ldi r17, CPRO_PAYLOAD_FLAGS_UID | (6<<CPRO_PAYLOAD_FLAGS_SHIFT_NUM)
+      ldi r18, CPRO_CMD_VALUE
+      rcall cproBeginMsgWithVariablePayload  ; (R3, R4, R16, R17, R18, R19, R20, R21, X)
+      st X+, r7                              ; 6: value id
+      st X+, r12                             ; 7: value type
+      st X+, r8                              ; 8: low value
+      st X+, r9                              ; 9: high value
+      st X+, r10                             ; 10: low denom
+      st X+, r11                             ; 11: high denom
+    pop xl
+  pop xh
+  rcall comCalcAndAddChecksumByte
+
+  ; mark buffer as enqueued with PRIO "normal" (slightly limited number of retries)
+  ldi r20, COM_BUFFER_PRIO_NORMAL
+  rcall COM_EnqueuePacket      ; (R15, R16)
+  brcc CPRO_EnqueueValue_error
+  sec
+  ret
+CPRO_EnqueueValue_error:
+  clc
+  ret
+
+
+