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receivedata added

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This commit is contained in:
Wolfgang Hottgenroth 2024-03-07 21:50:09 +01:00
parent 3eaf90dbd6
commit d295a36598
1 changed files with 44 additions and 2 deletions
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46
main.S
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@ -145,8 +145,9 @@ mainloop_draw:
;; signal waiting for data
set_signal_waiting_for_data
call #forwardscreen
call #wait
;call #forwardscreen
;call #wait
call #receivedata
;; data has been received, clear signal
clear_signal_waiting_for_data
@ -218,6 +219,47 @@ resetscreen_continue:
ret
;; ----------------------------------------------------
receivedata:
push r9
push r10
;; wait for first octet
receivedata_wait_for_first_octet:
bit #UCB0RXIFG, &UC0IFG
jz receivedata_wait_for_first_octet
;; get data 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
;; if it is not 0xff, it is the octet number which is the
;; relative address within screendata
receivedata_wait_for_octet:
bit #UCB0RXIFG, &UC0IFG
jz receivedata_wait_for_octet
;; get octet from buffer register
mov.b UCB0RXBUF, r10
;; move it to the destination
mov.b r10, screendata(r9)
;; done
jmp receivedata_end
receivedata_wait_for_all_data:
;; this is a bit dangerous, if the application controller
;; sends too few data, we are in a dead lock
receivedata_end:
pop r10
pop r9
ret
;; ----------------------------------------------------
drawscreen:
push r7