FreeCalypso > hg > freecalypso-tools
view target-utils/loadagent/serextra.S @ 828:502aec4c1e8e
fc-buzplay: implement playt command for PWT melodies
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sun, 30 May 2021 20:54:02 +0000 |
parents | 3229940734e5 |
children |
line wrap: on
line source
#include "ns16550.h" @ extra serial I/O functions for loadagent binary operations .text .code 32 .globl serial_out_if_empty serial_out_if_empty: ldr r1, =uart_base ldr r2, [r1] ldrb r3, [r2, #NS16550_LSR] tst r3, #NS16550_LSR_THRE strneb r0, [r2, #NS16550_THR] bx lr