diff options
| author | Jacques Comeaux <jacquesrcomeaux@protonmail.com> | 2024-05-26 14:21:59 -0500 |
|---|---|---|
| committer | Jacques Comeaux <jacquesrcomeaux@protonmail.com> | 2024-05-26 14:21:59 -0500 |
| commit | 5bbad5026cb810f61c2466d5c4bf3438ba820842 (patch) | |
| tree | 1fa99f91c1af046d812485ac52abf7b83eb2acdc /hexedit/hexedit.s | |
| parent | 7388c270069c2d1418539bca1d2789a6d468ecc2 (diff) | |
Finish hexedit and update README
Diffstat (limited to 'hexedit/hexedit.s')
| -rw-r--r-- | hexedit/hexedit.s | 42 |
1 files changed, 26 insertions, 16 deletions
diff --git a/hexedit/hexedit.s b/hexedit/hexedit.s index 0bc03a9..26bc84b 100644 --- a/hexedit/hexedit.s +++ b/hexedit/hexedit.s @@ -2,24 +2,34 @@ .cpu cortex-m0plus .thumb +.equ SRAM_BASE, 0x20000000 + .type hexedit, %function .global hexedit hexedit: - ldr r2, =0x20000100 - movs r1, 0 -getchar: + ldr r6, =SRAM_BASE + adds r5, r6, 1 +10: + movs r4, 0 +20: bl uart_recv - cmp r0, 'g - beq stop - subs r0, '0 // The ASCII char '0' - bmi next - lsls r1, 4 - adds r1, r0 - b getchar -next: - ldr r0, [r2, 0] - adds r2, 4 - b hexedit -stop: - b 0x20000100 + cmp r0, '\r + beq 30f + cmp r0, 'G + beq 40f + bl uart_send + subs r0, '0 + lsls r4, 3 + adds r4, r0 + b 20b +30: + movs r0, '\r + bl uart_send + movs r0, '\n + bl uart_send + strh r4, [r6] + adds r6, 2 + b 10b +40: + bx r5 |