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
|
/*
* Copyright © 2009 Keith Packard <keithp@keithp.com>
*
* 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; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "ao.h"
#define SERIAL_FIFO 32
struct ao_fifo {
uint8_t insert;
uint8_t remove;
uint8_t fifo[SERIAL_FIFO];
};
volatile __xdata struct ao_fifo ao_usart1_rx_fifo;
volatile __xdata struct ao_fifo ao_usart1_tx_fifo;
#define ao_fifo_insert(f,c) do { \
(f).fifo[(f).insert] = (c); \
(f).insert = ((f).insert + 1) & (SERIAL_FIFO-1); \
} while(0)
#define ao_fifo_remove(f,c) do {\
c = (f).fifo[(f).remove]; \
(f).remove = ((f).remove + 1) & (SERIAL_FIFO-1); \
} while(0)
#define ao_fifo_full(f) ((((f).insert + 1) & (SERIAL_FIFO-1)) == (f).remove)
#define ao_fifo_empty(f) ((f).insert == (f).remove)
void
ao_serial_rx1_isr(void) interrupt 3
{
if (!ao_fifo_full(ao_usart1_rx_fifo))
ao_fifo_insert(ao_usart1_rx_fifo, U1DBUF);
ao_wakeup(&ao_usart1_rx_fifo);
}
static __xdata uint8_t ao_serial_tx1_started;
static void
ao_serial_tx1_start(void)
{
if (!ao_fifo_empty(ao_usart1_tx_fifo) &&
!ao_serial_tx1_started)
{
ao_serial_tx1_started = 1;
ao_fifo_remove(ao_usart1_tx_fifo, U1DBUF);
}
}
void
ao_serial_tx1_isr(void) interrupt 14
{
UTX1IF = 0;
ao_serial_tx1_started = 0;
ao_serial_tx1_start();
ao_wakeup(&ao_usart1_tx_fifo);
}
uint8_t
ao_serial_getchar(void) __critical
{
uint8_t c;
while (ao_fifo_empty(ao_usart1_rx_fifo))
ao_sleep(&ao_usart1_rx_fifo);
ao_fifo_remove(ao_usart1_rx_fifo, c);
return c;
}
void
ao_serial_putchar(uint8_t c) __critical
{
while (ao_fifo_full(ao_usart1_tx_fifo))
ao_sleep(&ao_usart1_tx_fifo);
ao_fifo_insert(ao_usart1_tx_fifo, c);
ao_serial_tx1_start();
}
static void
send_serial(void)
{
ao_cmd_white();
while (ao_cmd_lex_c != '\n') {
ao_serial_putchar(ao_cmd_lex_c);
ao_cmd_lex();
}
}
__code struct ao_cmds ao_serial_cmds[] = {
{ 'S', send_serial, "S <data> Send data to serial line" },
{ 0, send_serial, NULL },
};
void
ao_serial_init(void)
{
/* Set up the USART pin assignment */
PERCFG = (PERCFG & ~PERCFG_U1CFG_ALT_MASK) | PERCFG_U1CFG_ALT_2;
/* ee has already set the P2SEL bits */
/* Make the USART pins be controlled by the USART */
P1SEL |= (1 << 6) | (1 << 7);
/* UART mode with receiver enabled */
U1CSR = (UxCSR_MODE_UART | UxCSR_RE);
/* Pick a 4800 baud rate */
U1BAUD = 163; /* 4800 */
U1GCR = 7 << UxGCR_BAUD_E_SHIFT; /* 4800 */
/* Reasonable serial parameters */
U1UCR = (UxUCR_FLUSH |
UxUCR_FLOW_DISABLE |
UxUCR_D9_ODD_PARITY |
UxUCR_BIT9_8_BITS |
UxUCR_PARITY_DISABLE |
UxUCR_SPB_1_STOP_BIT |
UxUCR_STOP_HIGH |
UxUCR_START_LOW);
IEN0 |= IEN0_URX1IE;
IEN2 |= IEN2_UTX1IE;
ao_cmd_register(&ao_serial_cmds[0]);
}
|
