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avr: increased COM buffer size to 24 bytes.

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This commit is contained in:
Martin Preuss
2023-04-05 23:38:09 +02:00
parent dc19b84fba
commit 604a85d54b
2 changed files with 14 additions and 7 deletions
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6
avr/MESSAGES
View File

@@ -2,8 +2,8 @@
General Message Format General Message Format
====================== ======================
Currently messages can maximally use 14 bytes for data because: Currently messages can maximally use 22 bytes for data because:
- maximum buffer size if 16 bytes - maximum buffer size if 24 bytes
- the internal buffer needs an additional flags byte - the internal buffer needs an additional flags byte
- a message contains a checksum byte - a message contains a checksum byte
@@ -116,7 +116,7 @@ Offset Length Meaning
3 1 source address 3 1 source address
--------------------------------------------------------- ---------------------------------------------------------
4 2 message number 4 2 message number
6 n up to 4 words to write at given address 6 n up to 8 words to write at given address

15
avr/com.asm
View File

@@ -28,7 +28,7 @@
.equ COM_REPEAT_VITAL = 255 .equ COM_REPEAT_VITAL = 255
.equ COM_BUFFER_NUM = 6 .equ COM_BUFFER_NUM = 6
.equ COM_BUFFER_SIZE = 16 ; CAVE: Need to change routine COM_BufferPosToY when changing this value!! .equ COM_BUFFER_SIZE = 24 ; CAVE: Need to change routine COM_BufferPosToY when changing this value!!
.equ COM_BUFFER_OFFS_FLAGS = 0 ; first byte in buffer is flags byte .equ COM_BUFFER_OFFS_FLAGS = 0 ; first byte in buffer is flags byte
@@ -939,12 +939,19 @@ COM_BufferPosToY:
lsl yl lsl yl
rol yh ; *2 rol yh ; *2
add yl, r16
adc yh, r17 ; *3
lsl yl lsl yl
rol yh ; *4 rol yh ; *6
lsl yl lsl yl
rol yh ; *8 rol yh ; *12
lsl yl lsl yl
rol yh ; *16 rol yh ; *24
; add base position of buffers ; add base position of buffers
ldi r16, LOW(comRecvBuffers) ldi r16, LOW(comRecvBuffers)
ldi r17, HIGH(comRecvBuffers) ldi r17, HIGH(comRecvBuffers)