From 954c0f55a4471b974bae4fe8aab3600e6dac7ed3 Mon Sep 17 00:00:00 2001
From: "Israel B. Sant'Anna" <ibsa14@inf.ufpr.br>
Date: Tue, 2 Jun 2015 23:43:44 -0300
Subject: [PATCH] =?UTF-8?q?Implementada=20parte=20de=20recep=C3=A7=C3=A3o?=
=?UTF-8?q?=20do=20handler=20(incompleto)?=
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Signed-off-by: Israel B. Sant'Anna <ibsa14@inf.ufpr.br>
---
cMIPS/tests/handlerUART.s | 24 +++++++++++++++++++-----
1 file changed, 19 insertions(+), 5 deletions(-)
diff --git a/cMIPS/tests/handlerUART.s b/cMIPS/tests/handlerUART.s
index eef98d2..f9ad569 100644
--- a/cMIPS/tests/handlerUART.s
+++ b/cMIPS/tests/handlerUART.s
@@ -8,11 +8,25 @@ RX:
lui $a0, %hi(HW_uart_addr)
ori $a0, $a0, %lo(HW_uart_addr)
lw $a1, 4($a0) # Read data
- nop # and store it to UART's buffer
- sw $a1, 4($k0) # and return from interrupt
- addiu $a1, $zero, 1
- sw $a1, 8($k0) # Signal new arrival
- # TODO: Read data, store it to buffer and decrement nrx (we're reading a char)
+
+ lui $a0, %hi(rx_queue)
+ ori $a0, $a0, %lo(rx_queue)
+ sw $a1, 0($a0) # Put data on RX_queue
+
+ lui $a0, %hi(rx_tl)
+ ori $a0, $a0, %lo(rx_tl)
+ lw $a1, 0($a0) # Read rx_tl
+ nop
+ addiu $a1, $a1, 1 # Increment rx_tl (shouldn't it be (rx_tl+1)%16 ?)
+ sw $a1, 0($a0) # Save rx_tl
+
+ lui $a0, %hi(nrx)
+ ori $a0, $a0, %lo(nrx)
+ lw $a1, 0($a0) # Read nrx
+ nop
+ addiu $a1, $a1, 1 # Increment nrx
+ sw $a1, 0($a0) # Save incremented nrx
+
TX:
andi $a0, $k1, UART_tx_irq # Is this transmission?
beq $a0, $zero, END # no, end handler
--
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