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csantifort |
/*****************************************************************
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// //
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// Amber 2 System UART Test //
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// //
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// This file is part of the Amber project //
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// http://www.opencores.org/project,amber //
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// //
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// Description //
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// Uses the tb_uart in loopback mode to verify the transmitted //
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// data. //
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// //
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// Author(s): //
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// - Conor Santifort, csantifort.amber@gmail.com //
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// //
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//////////////////////////////////////////////////////////////////
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// //
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// Copyright (C) 2010 Authors and OPENCORES.ORG //
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// //
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// This source file may be used and distributed without //
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// restriction provided that this copyright statement is not //
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// removed from the file and that any derivative work contains //
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// the original copyright notice and the associated disclaimer. //
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// //
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// This source file is free software; you can redistribute it //
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// and/or modify it under the terms of the GNU Lesser General //
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// Public License as published by the Free Software Foundation; //
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// either version 2.1 of the License, or (at your option) any //
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// later version. //
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// //
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// This source is distributed in the hope that it will be //
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// useful, but WITHOUT ANY WARRANTY; without even the implied //
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// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //
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// PURPOSE. See the GNU Lesser General Public License for more //
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// details. //
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// //
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// You should have received a copy of the GNU Lesser General //
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// Public License along with this source; if not, download it //
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// from http://www.opencores.org/lgpl.shtml //
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// //
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*****************************************************************/
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#include "amber_registers.h"
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.section .text
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.globl main
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main:
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@ Put test_uart into loopback mode, and enable transmit
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ldr r0, AdrTEST_UART_CONTROL
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mov r1, #0x3
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str r1, [r0]
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@ Write to and read back from UART0 registers
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ldr r4, AdrUART0DR
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ldr r5, =Message
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ldr r9, =Message
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ldr r7, =EndMessage
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1: bl wait_tx_full
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ldrb r6, [r5], #1
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@ transmit byte from test_uart
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str r6, [r4]
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15 |
csantifort |
bl uart_rx_check
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@ keep doing this until get to the end of the message
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2 |
csantifort |
cmp r5, r7
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bne 1b
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15 |
csantifort |
@ The complete message has now been transmitted
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@ but some bytes are still en route
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2 |
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@ check the last few bytes received
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bl uart_rx_check
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@ check that all bytes were received
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add r9, r9, #2
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cmp r9, r7
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movne r10, #100
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bne testfail
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b testpass
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@ -------------------------------------------
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wait_tx_full:
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@ with timeout loop of 0x400
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ldr r0, AdrUART0FR
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mov r2, #0x400
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1: subs r2, r2, #1
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moveq r10, #100
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beq testfail
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ldr r1, [r0]
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ands r1, r1, #0x20
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bne 1b
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mov pc, lr
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uart_rx_check:
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ldr r2, AdrUART0DR @ rx/tx byte
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ldr r3, AdrUART0FR @ flags
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@ if rx fifo empty flag == 1, return without doing anything
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1: ldr r0, [r3]
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ands r0, r0, #0x10
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movne pc, lr
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ldrb r0, [r2] @ uart rx byte
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ldrb r1, [r9], #1 @ transmitted text
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cmp r0, r1
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movne r10, #20
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bne testfail
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@ check if there are more bytes in rx buffer
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b 1b
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testfail:
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ldr r11, AdrTestStatus
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str r10, [r11]
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b testfail
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testpass:
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ldr r11, AdrTestStatus
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mov r10, #17
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str r10, [r11]
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b testpass
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@ ------------------------------------------
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@ ------------------------------------------
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/* Write 17 to this address to generate a Test Passed message */
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AdrTestStatus: .word ADR_AMBER_TEST_STATUS
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AdrTEST_UART_CONTROL: .word ADR_AMBER_TEST_UART_CONTROL
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AdrUART0DR: .word ADR_AMBER_UART0_DR
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AdrUART0FR: .word ADR_AMBER_UART0_FR
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Message: .ascii "\nThis message is brought to you by UART0\nThats all folks\n"
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EndMessage: .word 0
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