1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 Catalin Patulea <cat@vv.carleton.ca>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include "cpu.h"
#include "system.h"
#include "string.h"
#include "panic.h"
#include "uart-target.h"
#define MAX_UART_BUFFER 31
#define SEND_RING_SIZE 256
#define RECEIVE_RING_SIZE 20
char
uart1_send_buffer_ring[SEND_RING_SIZE],
uart1_receive_buffer_ring[RECEIVE_RING_SIZE];
static volatile int uart1_send_count, uart1_send_read, uart1_send_write;
static volatile int uart1_receive_count, uart1_receive_read, uart1_receive_write;
void uart_init(void)
{
// 8-N-1
IO_UART1_MSR = 0xC400;
IO_UART1_BRSR = 0x0057;
IO_UART1_RFCR = 0x8020; /* Trigger later */
IO_UART1_TFCR = 0x0000; /* Trigger level */
/* gio 27 is input, uart1 rx
gio 28 is output, uart1 tx */
IO_GIO_DIR1 |= (1<<11); /* gio 27 */
IO_GIO_DIR1 &= ~(1<<12); /* gio 28 */
/* init the receive buffer */
uart1_receive_count=0;
uart1_receive_read=0;
uart1_receive_write=0;
/* init the send buffer */
uart1_send_count=0;
uart1_send_read=0;
uart1_send_write=0;
/* Enable the interrupt */
IO_INTC_EINT0 |= INTR_EINT0_UART1;
}
/* This function is not interrupt driven */
void uart1_putc(char ch)
{
/* Wait for the interupt driven puts to finish */
while(uart1_send_count>0);
/* Wait for room in FIFO */
while ((IO_UART1_TFCR & 0x3f) >= 0x20);
/* Write character */
IO_UART1_DTRR=ch;
}
void uart1_puts(const char *str, int size)
{
if(size>SEND_RING_SIZE)
panicf("Too much data passed to uart1_puts");
/* Wait for the previous transfer to finish */
while(uart1_send_count>0);
memcpy(uart1_send_buffer_ring, str, size);
/* Disable interrupt while modifying the pointers */
IO_INTC_EINT0 &= ~INTR_EINT0_UART1;
uart1_send_count=size;
uart1_send_read=0;
/* prime the hardware buffer */
while(((IO_UART1_TFCR & 0x3f) < 0x20) && (uart1_send_count > 0))
{
IO_UART1_DTRR=uart1_send_buffer_ring[uart1_send_read++];
uart1_send_count--;
}
/* Enable interrupt */
IO_INTC_EINT0 |= INTR_EINT0_UART1;
}
void uart1_clear_queue(void)
{
/* Disable interrupt while modifying the pointers */
IO_INTC_EINT0 &= ~INTR_EINT0_UART1;
uart1_receive_write=0;
uart1_receive_count=0;
uart1_receive_read=0;
/* Enable interrupt */
IO_INTC_EINT0 |= INTR_EINT0_UART1;
}
/* This function returns the number of bytes left in the queue after a read is done (negative if fail)*/
int uart1_gets_queue(char *str, int size)
{
/* Disable the interrupt while modifying the pointers */
IO_INTC_EINT0 &= ~INTR_EINT0_UART1;
int retval;
if(uart1_receive_count<size)
{
retval= -1;
}
else
{
if(uart1_receive_read+size<=RECEIVE_RING_SIZE)
{
memcpy(str,uart1_receive_buffer_ring+uart1_receive_read,size);
uart1_receive_read+=size;
}
else
{
int tempcount=(RECEIVE_RING_SIZE-uart1_receive_read);
memcpy(str,uart1_receive_buffer_ring+uart1_receive_read,tempcount);
memcpy(str+tempcount,uart1_receive_buffer_ring,size-tempcount);
uart1_receive_read=size-tempcount;
}
uart1_receive_count-=size;
retval=uart1_receive_count;
}
/* Enable the interrupt */
IO_INTC_EINT0 |= INTR_EINT0_UART1;
return retval;
}
/* UART1 receive/transmit interupt handler */
void UART1(void)
{
IO_INTC_IRQ0 = INTR_IRQ0_UART1; /* Clear the interrupt first */
while (IO_UART1_RFCR & 0x3f)
{
if (uart1_receive_count > RECEIVE_RING_SIZE)
panicf("UART1 receive buffer overflow");
else
{
if(uart1_receive_write>=RECEIVE_RING_SIZE)
uart1_receive_write=0;
uart1_receive_buffer_ring[uart1_receive_write]=IO_UART1_DTRR & 0xff;
uart1_receive_write++;
uart1_receive_count++;
}
}
while ( ((IO_UART1_TFCR & 0x3f) < 0x20) && (uart1_send_count > 0) )
{
IO_UART1_DTRR=uart1_send_buffer_ring[uart1_send_read++];
uart1_send_count--;
}
}
|
