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.syntax unified
.cpu cortex-m0plus
.thumb
.type register, %function
.global register
register:
PUSH {LR}
MOV R4, R0
LSLS R4, 1
ADDS R4, ('0 + 1)
10:
BL get_char
MOVS R1, 'R
CMP R0, R1
BNE 10b
BL uart_send
20:
BL get_char
MOVS R1, '0
CMP R0, R1
BLO 20b
CMP R0, R4
BHI 20b
BL uart_send
MOVS R1, '1
CMP R0, R1
BNE 30f
MOVS R1, '7
CMP R4, R1
BEQ 30f
50:
BL get_char
// CMP R0, ' // space is stop char
BEQ 60f
MOVS R1, '0
CMP R0, R1
BLO 50b
MOVS R1, '5
CMP R0, R1
BHI 50b
BL uart_send
ADDS R0, 10
30:
SUBS R0, '0
MOV R4, R0
40:
BL get_char
// CMP R0, ' // space is stop char
BNE 40b
POP {PC}
60:
MOVS R4, 1
POP {PC}
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