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[/] [amber/] [trunk/] [hw/] [tests/] [uart_rx.S] - Rev 2
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/*****************************************************************
// //
// Amber 2 System UART Test //
// //
// This file is part of the Amber project //
// http://www.opencores.org/project,amber //
// //
// Description //
// Tests the UART receive function. //
// //
// Author(s): //
// - Conor Santifort, csantifort.amber@gmail.com //
// //
//////////////////////////////////////////////////////////////////
// //
// Copyright (C) 2010 Authors and OPENCORES.ORG //
// //
// This source file may be used and distributed without //
// restriction provided that this copyright statement is not //
// removed from the file and that any derivative work contains //
// the original copyright notice and the associated disclaimer. //
// //
// This source file is free software; you can redistribute it //
// and/or modify it under the terms of the GNU Lesser General //
// Public License as published by the Free Software Foundation; //
// either version 2.1 of the License, or (at your option) any //
// later version. //
// //
// This source is distributed in the hope that it will be //
// useful, but WITHOUT ANY WARRANTY; without even the implied //
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //
// PURPOSE. See the GNU Lesser General Public License for more //
// details. //
// //
// You should have received a copy of the GNU Lesser General //
// Public License along with this source; if not, download it //
// from http://www.opencores.org/lgpl.shtml //
// //
*****************************************************************/
#include "amber_registers.h"
.section .text
.globl main
main:
@ Configure the Amber UART to use the FIFO to receive
ldr r4, AdrUART0LCRH
mov r5, #0x10
str r5, [r4]
@ Load some bytes into the testbench uart
@ so it can transmit them to the Amber UART
ldr r4, AdrTEST_UART_TXD
ldr r5, =Message
ldr r9, =Message
ldr r7, =EndMessage
ldr r8, AdrTEST_UART_STATUS
@ transmit a byte from test uart
ldrb r6, [r5], #1
str r6, [r4]
@ test_uart transmit enable
ldr r0, AdrTEST_UART_CONTROL
mov r1, #1
str r1, [r0]
main_loop:
@ wait if test_uart tx fifo full
1: ldr r0, [r8]
ands r0, r0, #2
bne 1b
@ transmit a byte from test uart
ldrb r6, [r5], #1
str r6, [r4]
@ UART receive and transmit byte
bl uart_rx_check
@ full message transmitted?
cmp r5, r7
bne main_loop
@ while test_uart tx fifo empty == 0
2: bl uart_rx_check
ldr r0, [r8]
ands r0, r0, #1
beq 2b
@ wait until uart tx fifo empty == 1
ldr r3, AdrUART0FR @ flags
3: ldr r1, [r3]
ands r1, r1, #0x80
beq 3b
@ check the last few bytes received
bl uart_rx_check
@ ------------------------------------------
@ ------------------------------------------
b testpass
uart_rx_check:
ldr r2, AdrUART0DR @ rx/tx byte
ldr r3, AdrUART0FR @ flags
@ if rx fifo empty flag == 1, return without doing anything
1: ldr r0, [r3]
ands r0, r0, #0x10
movne pc, lr
ldrb r0, [r2] @ uart rx byte
ldrb r1, [r9], #1 @ transmitted text
cmp r0, r1
movne r10, #20
bne testfail
@ check if there are more bytes in rx buffer
b 1b
testfail:
ldr r11, AdrTEST_STATUS
str r10, [r11]
b testfail
testpass:
ldr r11, AdrTEST_STATUS
mov r10, #17
str r10, [r11]
b testpass
@ ------------------------------------------
@ ------------------------------------------
/* Write 17 to this address to generate a Test Passed message */
AdrTEST_STATUS: .word ADR_AMBER_TEST_STATUS
AdrTEST_IRQ_TIMER: .word ADR_AMBER_TEST_IRQ_TIMER
AdrTEST_RANDOM_NUM: .word ADR_AMBER_TEST_RANDOM_NUM
AdrTEST_UART_CONTROL: .word ADR_AMBER_TEST_UART_CONTROL
AdrTEST_UART_STATUS: .word ADR_AMBER_TEST_UART_STATUS
AdrTEST_UART_TXD: .word ADR_AMBER_TEST_UART_TXD
AdrUART0LCRH: .word ADR_AMBER_UART0_LCRH
AdrUART0DR: .word ADR_AMBER_UART0_DR
AdrUART0FR: .word ADR_AMBER_UART0_FR
/* Include some non-characters in the string to test all 8 bits */
Message: .word 0xa0ff810a
.ascii "\nThis message is brought to you by UART0\nIsnt that cool\nThats all folks\n"
EndMessage: .word 0