FreeCalypso > hg > freecalypso-sw
comparison gsm-fw/lldbg/serio.S @ 865:f5affe83ba2d
lldbg hack (poor girl's substitute for JTAG) implemented
| author | Space Falcon <falcon@ivan.Harhan.ORG> |
|---|---|
| date | Fri, 15 May 2015 00:02:03 +0000 |
| parents | |
| children |
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| 864:4fa939eada22 | 865:f5affe83ba2d |
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| 1 #include "../include/config.h" | |
| 2 #include "ns16550.h" | |
| 3 | |
| 4 /* this module implements the elementary serial I/O operations */ | |
| 5 | |
| 6 .text | |
| 7 .code 32 | |
| 8 .globl lldbg_serial_out | |
| 9 lldbg_serial_out: | |
| 10 ldr r2, =CONFIG_LLDBG_UART_BASE | |
| 11 1: ldrb r3, [r2, #NS16550_LSR] | |
| 12 tst r3, #NS16550_LSR_THRE | |
| 13 beq 1b | |
| 14 strb r0, [r2, #NS16550_THR] | |
| 15 bx lr | |
| 16 | |
| 17 .globl lldbg_serial_in_poll | |
| 18 lldbg_serial_in_poll: | |
| 19 ldr r2, =CONFIG_LLDBG_UART_BASE | |
| 20 ldrb r3, [r2, #NS16550_LSR] | |
| 21 tst r3, #NS16550_LSR_DR | |
| 22 ldrneb r0, [r2, #NS16550_RBR] | |
| 23 mvneq r0, #0 | |
| 24 bx lr | |
| 25 | |
| 26 #if 0 // not needed currently | |
| 27 .globl lldbg_serial_flush | |
| 28 lldbg_serial_flush: | |
| 29 ldr r2, =CONFIG_LLDBG_UART_BASE | |
| 30 1: ldrb r3, [r2, #NS16550_LSR] | |
| 31 tst r3, #NS16550_LSR_TEMP | |
| 32 beq 1b | |
| 33 bx lr | |
| 34 #endif |