FreeCalypso > hg > freecalypso-tools
view target-utils/libbase/serio.S @ 698:9ecbf1bf2e1b
fc-iram: added '+' to getopt magic string like in fc-xram
Both fc-iram and fc-xram now support secondary program invokation.
If the user needs to pass some options to the secondary program,
we don't want fc-iram or fc-xram to claim these options as its own,
thus we need to stop getopt() from reordering arguments. This fix
was already implemented in fc-xram a long time ago, but the issue
was overlooked when secondary program invokation ability was added
to fc-iram.
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Tue, 31 Mar 2020 03:23:26 +0000 |
| parents | da6df2c626cf |
| children |
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#include "ns16550.h" @ this module implements the elementary serial I/O operations .comm uart_base,4,4 .text .code 32 .global serial_out serial_out: ldr r1, =uart_base ldr r2, [r1] 1: ldrb r3, [r2, #0x11] @ Calypso UART non-std register SSR tst r3, #0x01 @ Tx FIFO full flag bne 1b strb r0, [r2, #NS16550_THR] bx lr .global serial_in_poll serial_in_poll: ldr r1, =uart_base ldr r2, [r1] ldrb r3, [r2, #NS16550_LSR] tst r3, #NS16550_LSR_DR ldrneb r0, [r2, #NS16550_RBR] mvneq r0, #0 bx lr .global serial_flush serial_flush: ldr r1, =uart_base ldr r2, [r1] 1: ldrb r3, [r2, #NS16550_LSR] tst r3, #NS16550_LSR_TEMP beq 1b bx lr