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
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 Catalin Patulea <cat@vv.carleton.ca>
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* 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"
#define MAX_UART_BUFFER 31
#define SEND_RING_SIZE 256
#define RECIEVE_RING_SIZE 20
char
// uart1_send_buffer_ring[SEND_RING_SIZE],
uart1_recieve_buffer_ring[RECIEVE_RING_SIZE];
//static unsigned int uart1_send_count, uart1_send_read, uart1_send_write;
static unsigned int uart1_recieve_count, uart1_recieve_read, uart1_recieve_write;
void uart_init(void)
{
// 8-N-1
IO_UART1_MSR=0x8000;
IO_UART1_BRSR=0x0057;
IO_UART1_RFCR = 0x8010; /* Trigger later */
/* 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 recieve buffer */
uart1_recieve_count=0;
uart1_recieve_read=0;
uart1_recieve_write=0;
/* Enable the interrupt */
IO_INTC_EINT0 |= INTR_EINT0_UART1;
}
void uart1_putc(char ch)
{
/* 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)
{
int count=0;
while (count<size)
{
uart1_putc(str[count]);
count++;
}
}
/* 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, unsigned int size)
{
IO_INTC_EINT0 &= ~INTR_EINT0_UART1;
int retval;
if(uart1_recieve_count<size)
{
retval= -1;
}
else
{
if(uart1_recieve_read+size<RECIEVE_RING_SIZE)
{
memcpy(str,uart1_recieve_buffer_ring+uart1_recieve_read,size);
}
else
{
int tempcount=(RECIEVE_RING_SIZE-uart1_recieve_read);
memcpy(str,uart1_recieve_buffer_ring+uart1_recieve_read,tempcount);
memcpy(str+tempcount,uart1_recieve_buffer_ring,size-tempcount);
}
uart1_recieve_count-=size;
if(uart1_recieve_read+size<RECIEVE_RING_SIZE)
uart1_recieve_read+=size;
else
uart1_recieve_read=size-(RECIEVE_RING_SIZE-uart1_recieve_read);
retval=uart1_recieve_count;
}
/* Enable the interrupt */
IO_INTC_EINT0 |= INTR_EINT0_UART1;
return retval;
}
/* UART1 receive interupt handler */
void UART1(void)
{
while (IO_UART1_RFCR & 0x3f)
{
if (uart1_recieve_count > RECIEVE_RING_SIZE)
panicf("UART1 buffer overflow");
else
{
if(uart1_recieve_write==RECIEVE_RING_SIZE)
uart1_recieve_write=0;
uart1_recieve_buffer_ring[uart1_recieve_write] = IO_UART1_DTRR & 0xff;
uart1_recieve_write++;
uart1_recieve_count++;
}
}
IO_INTC_IRQ0 = INTR_IRQ0_UART1;
}
|
