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uarttest.asm
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;; assume default stack is ok
ORG 0
CALL splash
top:
LDRIQ '?', FACC
CALL uartsend
LDRIQ ' ', FACC ; note that call clobbers FIMM
CALL uartsend
CALL uartrx
MOV FACC,FIO_LED
CALL uartsend
MOV FACC,FIO_DISP
MOV FACC,FIO_UART
JMP top
crlf:
PUSH FACC
LDRIQ 13,FACC
CALL uartsend
LDRIQ 10,FACC
CALL uartsend
POP FACC
RET
uartsend:
PUSH FACC
CALL uarttwait
POP FACC
MOV FACC, FIO_UART
RET
uarttwait:
MOV FIO_UART_TBE,FACC
MOVP FCON_neg1,FPC_ADD
RET
uartrx:
MOV FIO_UART_DR,FACC
MOVP FCON_neg1,FPC_ADD
MOV FIO_UART,FACC
RET
splash: LDRIQ 0x20,FLOOP_IEND
MOV FCON_0,FLOOP_I
MOV FCON_1,FLOOP_IINC
LDRI 0x01000001, FACC
MOV FIMMV,FACC2
LDRIQ splash0,FLOOP_IADD ;assume it will fit in a small constant
splash0:
MOV FACC,FIO_LED
CALL hexout8
CALL crlf
MOV FCON_1,FACC_SHL
MOVC FACC2,FACC
MOV FCON_ff0000,FIO_DELAY
MOV FIO_DELAY,FZERO
MOV FLOOP_IADD,FPC
RET
hexout8:
PUSH FACC
MOV FBYTE_W1,FACC
CALL hexout4
POP FACC
;; fall into hexout4
hexout4:
PUSH FACC
MOV FBYTE_1,FACC
CALL hexout2
POP FACC
;; fall into hexout2
hexout2:
PUSH FACC
MOV FCON_4,FACC_SHR
CALL hexout1
POP FACC
;; fall into hexout1
hexout1:
PUSH FACC
PUSH FACC2
MOV FCON_f,FACC_AND
LDRIQ '0',FACC2
MOV FACC,FACC2_ADD ; 0 to 9 is now good, a-f needs +7
MOV FCON_a,FACC_SUB
LDIQ 7
MOVP FIMMV,FACC2_ADD
CALL uarttwait
MOV FACC2,FIO_UART
POP FACC2
POP FACC
RET
END