diff options
| 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 /xosc.s | |
| parent | 473e52cbe7cbee0333b7d97d91c4bbf95c1b3225 (diff) | |
Add subroutine for printing hexadecimal word
Diffstat (limited to 'xosc.s')
| -rw-r--r-- | xosc.s | 23 |
1 files changed, 0 insertions, 23 deletions
@@ -1,23 +0,0 @@ -.syntax unified -.cpu cortex-m0plus -.thumb - -.equ XOSC_BASE, 0x40024000 -.equ CTRL_OFST, 0x0 -.equ STATUS_OFST, 0x4 -.equ STARTUP_OFST, 0xc - -.type start_xosc, %function -.global start_xosc - -start_xosc: - ldr r1, =XOSC_BASE - movs r0, 47 // startup delay = 47 for 12Mhz crystal - str r0, [r1, STARTUP_OFST] - ldr r0, =0x00fabaa0 // enable - str r0, [r1, CTRL_OFST] -1: - ldr r0, [r1, STATUS_OFST] - lsrs r0, 31 // stable bit - beq 1b - bx lr |