From 6ac0e1cc382ea7dd3fac62527d9e6b4ae4f23f1d Mon Sep 17 00:00:00 2001
From: "Israel B. Sant'Anna" <ibsa14@inf.ufpr.br>
Date: Tue, 9 Jun 2015 14:04:34 -0300
Subject: [PATCH] Changed from lw/sw to lbu/sb the character read/write in
handlerUART
Signed-off-by: Israel B. Sant'Anna <ibsa14@inf.ufpr.br>
---
cMIPS/tests/handlerUART.s | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/cMIPS/tests/handlerUART.s b/cMIPS/tests/handlerUART.s
index 17a0d50..806c52f 100644
--- a/cMIPS/tests/handlerUART.s
+++ b/cMIPS/tests/handlerUART.s
@@ -10,6 +10,8 @@ RX:
lw $a1, 48($a0) # Read nrx
+ la $2,x_IO_BASE_ADDR
+ sw $a1,0($2) # Print for debug
addiu $k1, $zero, 16
slt $k1, $a1, $k1 # If nrx >= 16 the queue is full
@@ -28,13 +30,13 @@ RX:
lui $a1, %hi(HW_uart_addr)
ori $a1, $a1, %lo(HW_uart_addr)
- lw $k1, 4($a1) # Read data
+ lbu $k1, 4($a1) # Read data
nop
- sw $k1, 0($a0) # Put data on RX_queue tail
+ sb $k1, 0($a0) # Put data on RX_queue tail
- #FIXME: Breaks after trying to save second character on rx_queue
la $2,x_IO_BASE_ADDR
- sw $k1,0($2) # Print for debug
+ sw $a0,0($2) # Print for debug
+
TX:
@@ -61,11 +63,11 @@ TX:
addiu $a1, $a1, 24 # tx_hd position on tx_queue
add $a0, $a1, $a0 # tx_queue head address
- lw $a1, 0($a0) # Read TX_queue head
+ lbu $a1, 0($a0) # Read TX_queue head
lui $a0, %hi(HW_uart_addr)
ori $a0, $a0, %lo(HW_uart_addr)
- sw $a1, 0($a0) # Put data on UART
+ sb $a1, 4($a0) # Put data on UART
END:
--
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