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| author | Jacques Comeaux <jacquesrcomeaux@protonmail.com> | 2024-01-19 16:41:29 -0600 |
|---|---|---|
| committer | Jacques Comeaux <jacquesrcomeaux@protonmail.com> | 2024-01-19 16:41:29 -0600 |
| commit | 261c210c9c4c1e55103a7af31dfcc539c0e0e5cc (patch) | |
| tree | 71840ab97b84dd3f995ea8900b08c98149feac36 /hexedit/hexedit.s | |
| parent | 473e52cbe7cbee0333b7d97d91c4bbf95c1b3225 (diff) | |
Add subroutine for printing hexadecimal word
Diffstat (limited to 'hexedit/hexedit.s')
| -rw-r--r-- | hexedit/hexedit.s | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/hexedit/hexedit.s b/hexedit/hexedit.s new file mode 100644 index 0000000..0bc03a9 --- /dev/null +++ b/hexedit/hexedit.s @@ -0,0 +1,25 @@ +.syntax unified +.cpu cortex-m0plus +.thumb + +.type hexedit, %function +.global hexedit + +hexedit: + ldr r2, =0x20000100 + movs r1, 0 +getchar: + 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 |