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accept multiple address/data octets

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This commit is contained in:
Wolfgang Hottgenroth 2024-03-08 08:16:56 +01:00
parent d295a36598
commit a5438cef14
1 changed files with 11 additions and 8 deletions
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19
main.S
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@ -225,30 +225,33 @@ receivedata:
push r10
;; wait for first octet
receivedata_wait_for_first_octet:
receivedata_wait_for_control_octet:
bit #UCB0RXIFG, &UC0IFG
jz receivedata_wait_for_first_octet
jz receivedata_wait_for_control_octet
;; get data from buffer register
;; get control or address octet from buffer register
mov.b UCB0RXBUF, r9
;; check whether value == 0xff (wait for the whole
;; set of data to fill the screendata)
cmp.b #0xff, r9
;; receive all data
jz receivedata_wait_for_all_data
;; check whether value == 0xfe (no more data)
cmp.b #0xfe, r9
;; no more data
jz receivedata_end
;; if it is not 0xff, it is the octet number which is the
;; relative address within screendata
;; it is an address octet
receivedata_wait_for_octet:
bit #UCB0RXIFG, &UC0IFG
jz receivedata_wait_for_octet
;; get octet from buffer register
;; get data octet from buffer register
mov.b UCB0RXBUF, r10
;; move it to the destination
mov.b r10, screendata(r9)
;; done
jmp receivedata_end
;; next address/control octet
jmp receivedata_wait_for_control_octet
receivedata_wait_for_all_data:
;; this is a bit dangerous, if the application controller