From fa4bf4f8b51569a84859f0b6f122564381d371c6 Mon Sep 17 00:00:00 2001
From: Jedian <jmb15@c3sl.ufpr.br>
Date: Tue, 24 May 2016 21:57:32 -0300
Subject: [PATCH] Started rx_queue
Signed-off-by: Jedian <jmb15@c3sl.ufpr.br>
---
cMIPS/include/mainjedi.c | 12 ++++++++++
cMIPS/tests/handlerUARTjedi.s | 45 ++++++++++++++++++++++++++++++++++-
cMIPS/tests/uartrx.c | 17 +++++++++++--
3 files changed, 71 insertions(+), 3 deletions(-)
diff --git a/cMIPS/include/mainjedi.c b/cMIPS/include/mainjedi.c
index 668d307..23e6718 100644
--- a/cMIPS/include/mainjedi.c
+++ b/cMIPS/include/mainjedi.c
@@ -1,5 +1,17 @@
#include "cMIPS.h"
+typedef struct UARTdriver {
+int rx_hd ; // reception queue head index
+int rx_tl ; // reception queue tail index
+char rx_q [16]; // reception queue
+int tx_hd ; // transmission queue head index
+int tx_tl ; // transmission queue tail index
+char tx_q [16]; // transmission queue
+int nrx ; // number of characters in rx_queue
+int ntx ; // number of spaces in tx_queue
+} UARTdriver ;
+extern UARTdriver Ud ;
+
typedef struct control { // control register fields (uses only ls byte)
int ign : 24, // ignore uppermost bits
rts : 1, // Request to Send output (bit 7)
diff --git a/cMIPS/tests/handlerUARTjedi.s b/cMIPS/tests/handlerUARTjedi.s
index 4336d21..8f2915d 100644
--- a/cMIPS/tests/handlerUARTjedi.s
+++ b/cMIPS/tests/handlerUARTjedi.s
@@ -1,4 +1,9 @@
#UARTinterr:
+ # There is space on _uart_buff
+ # _uart_buff[0]=UARTstatus, [1]=UARTcontrol, [2]=data_inp, [3]=new,
+ # [4]=$ra, [5]=$a0, [6]=$a1, [7]=$a2, [8]=$a3
+ #k0 = _uart_buff
+
andi $a1, $k1, UART_rx_irq # Is this reception?
beq $a1, $zero, UARTinterr2 # no, maybe transmission?
nop
@@ -9,7 +14,44 @@
sw $a1, 2*4($k0) # and return from interrupt
addiu $a1, $zero, 1
sw $a1, 3*4($k0) # Signal new arrival
- # Jedian: when a new char is on the UART's buffer, i have to enqueue it and update nrx
+ # Jedian: when a new char is on the UART's buffer,
+ # i have to enqueue it and update nrx.
+
+ #ACHO QUE ELE NAO TA RESETANDO O INTERRUPTION REQUEST, AI FICA TRAVADAO
+ # saving used registers on _uart_buff
+ sw $5, 9*4($k0)
+ sw $6, 10*4($k0)
+ sw $7, 11*4($k0)
+
+ # enqueue
+ lui $5, %hi(rx_hd) # get rx head address
+ ori $5, $5, %lo(rx_hd)
+
+ lw $7, 0($5)
+
+ #### stores on queue on calculated new head
+ lui $6, %hi(rx_q) # get queue address
+ ori $6, $6, %lo(rx_q)
+
+ sll $7, $7, 2 # multiply by 4
+ addu $6, $7, $6 # calculate address to move new char
+ lw $7, 2*4($k0) # get char to be stored
+ nop
+ sw $7, 0($6) # and store it!
+
+ #### process rx_hd
+ lw $7, 0($5)
+ addiu $7, $7, 1 # increment in 1 the head of the circular queue
+ li $6, 16 # calculate mod 16
+ div $7, $6
+ mfhi $7
+ sw $7, 0($5)
+
+
+ # loading back used registers
+ lw $5, 9*4($k0)
+ lw $6, 10*4($k0)
+ lw $7, 11*4($k0)
UARTinterr2:
andi $a1, $k1, UART_tx_irq # Is this transmission?
@@ -19,5 +61,6 @@ UARTinterr2:
#handle transmission
# ... TODO
+ # Lembrar de inicializar os hd e tl com 0 no comeco do main
#UARTret:
diff --git a/cMIPS/tests/uartrx.c b/cMIPS/tests/uartrx.c
index cc00516..7ded407 100644
--- a/cMIPS/tests/uartrx.c
+++ b/cMIPS/tests/uartrx.c
@@ -1,5 +1,18 @@
#include "cMIPS.h"
+typedef struct UARTdriver {
+int rx_hd ; // reception queue head index
+int rx_tl ; // reception queue tail index
+char rx_q [16]; // reception queue
+int tx_hd ; // transmission queue head index
+int tx_tl ; // transmission queue tail index
+char tx_q [16]; // transmission queue
+int nrx ; // number of characters in rx_queue
+int ntx ; // number of spaces in tx_queue
+} UARTdriver ;
+extern UARTdriver Ud ;
+
+
typedef struct control { // control register fields (uses only ls byte)
int ign : 24, // ignore uppermost bits
rts : 1, // Request to Send output (bit 7)
@@ -67,7 +80,7 @@ int main(void) { // receive a string through the UART serial interface
ctrl.rts = 1; // make RTS=1 to activate RemoteUnit
ctrl.ign2 = 0;
ctrl.intTX = 0;
- ctrl.intRX = 0;
+ ctrl.intRX = 1;
ctrl.speed = 1; // operate at the second highest data rate
uart->cs.ctl = ctrl;
@@ -78,7 +91,7 @@ int main(void) { // receive a string through the UART serial interface
if (state == 0) cmips_delay(1); // just do something with state
s[i] = (char)uart->d.rx;
to_stdout( s[i] );
-
+ //to_stdout( (Ud.rx_hd+'0') );
} while (s[i] != '\0');
return(state);
--
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