FreeCalypso > hg > freecalypso-sw
view gsm-fw/lldbg/serio.S @ 992:a7b0b426f9ca
target-utils: boot ROM UART autodetection revamped
The new implementation should work with both the familiar Calypso C035
boot ROM version found in our regular targets as well as the older
Calypso F741979B version found on the vintage D-Sample board.
author | Mychaela Falconia <falcon@ivan.Harhan.ORG> |
---|---|
date | Wed, 30 Dec 2015 21:28:41 +0000 |
parents | f5affe83ba2d |
children |
line wrap: on
line source
#include "../include/config.h" #include "ns16550.h" /* this module implements the elementary serial I/O operations */ .text .code 32 .globl lldbg_serial_out lldbg_serial_out: ldr r2, =CONFIG_LLDBG_UART_BASE 1: ldrb r3, [r2, #NS16550_LSR] tst r3, #NS16550_LSR_THRE beq 1b strb r0, [r2, #NS16550_THR] bx lr .globl lldbg_serial_in_poll lldbg_serial_in_poll: ldr r2, =CONFIG_LLDBG_UART_BASE ldrb r3, [r2, #NS16550_LSR] tst r3, #NS16550_LSR_DR ldrneb r0, [r2, #NS16550_RBR] mvneq r0, #0 bx lr #if 0 // not needed currently .globl lldbg_serial_flush lldbg_serial_flush: ldr r2, =CONFIG_LLDBG_UART_BASE 1: ldrb r3, [r2, #NS16550_LSR] tst r3, #NS16550_LSR_TEMP beq 1b bx lr #endif