📄 sio.lst
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C51 COMPILER V6.23a SIO 05/11/2007 22:24:42 PAGE 1
C51 COMPILER V6.23a, COMPILATION OF MODULE SIO
OBJECT MODULE PLACED IN SIO.OBJ
COMPILER INVOKED BY: C:\Keil623\C51\BIN\C51.EXE SIO.C OPTIMIZE(11,SPEED) REGFILE(.\intsio2.ORC) BROWSE DEFINE(XTAL=11059
-200) OBJECTADVANCED DEBUG CODE SYMBOLS PREPRINT
stmt level source
1
2 #include <reg52.h>
3 #include <string.h>
4 #include "sio.h"
5
6 /*------------------------------------------------------------------------------
7 Notes:
8
9 The length of the receive and transmit buffers must be a power of 2.
10
11 Each buffer has a next_in and a next_out index.
12
13 If next_in = next_out, the buffer is empty.
14
15 (next_in - next_out) % buffer_size = the number of characters in the buffer.
16 ------------------------------------------------------------------------------*/
17 #define TBUF_SIZE 2 /*** Must be one of these powers of 2 (2,4,8,16,32,64,128) ***/
18 #define RBUF_SIZE 8 /*** Must be one of these powers of 2 (2,4,8,16,32,64,128) ***/
19
20 #define TBUF_SPACE idata /*** Memory space where the transmit buffer resides ***/
21 #define RBUF_SPACE idata /*** Memory space where the receive buffer resides ***/
22
23 #define CTRL_SPACE data /*** Memory space for the buffer indexes ***/
24 /* #define XTAL 12000000L */
25 #define XTAL 11059200L
*** WARNING C317 IN LINE 25 OF SIO.C: redefinition of macro 'XTAL'
26 /*------------------------------------------------------------------------------
27 ------------------------------------------------------------------------------*/
28 #if TBUF_SIZE < 2
#error TBUF_SIZE is too small. It must be larger than 1.
#elif TBUF_SIZE > 128
#error TBUF_SIZE is too large. It must be smaller than 129.
#elif ((TBUF_SIZE & (TBUF_SIZE-1)) != 0)
#error TBUF_SIZE must be a power of 2.
#endif
35
36 #if RBUF_SIZE < 2
#error RBUF_SIZE is too small. It must be larger than 1.
#elif RBUF_SIZE > 128
#error RBUF_SIZE is too large. It must be smaller than 129.
#elif ((RBUF_SIZE & (RBUF_SIZE-1)) != 0)
#error RBUF_SIZE must be a power of 2.
#endif
43
44 /*------------------------------------------------------------------------------
45 ------------------------------------------------------------------------------*/
46 sbit P34 = 0xB4;
47 static TBUF_SPACE unsigned char tbuf [TBUF_SIZE];
48 static RBUF_SPACE unsigned char rbuf [RBUF_SIZE];
49
50 static CTRL_SPACE unsigned char t_in = 0;
51 static CTRL_SPACE unsigned char t_out = 0;
52
53 static CTRL_SPACE unsigned char r_in = 0;
C51 COMPILER V6.23a SIO 05/11/2007 22:24:42 PAGE 2
54 static CTRL_SPACE unsigned char r_out = 0;
55
56 static bit ti_restart = 0; /* NZ if TI=1 is required */
57
58 extern void update_LCD( unsigned char ASC_II );
59
60 /*------------------------------------------------------------------------------
61 ------------------------------------------------------------------------------*/
62 static void com_isr (void) interrupt 4
63 { unsigned char temp ;
64 1 /*------------------------------------------------
65 1 Received data interrupt.
66 1 ------------------------------------------------*/
67 1 if (RI != 0)
68 1 {
69 2 RI = 0;
70 2 if( P34 == 0 ) { //P34 == 0，主机呼叫
71 3 if (((r_in - r_out) & ~(RBUF_SIZE-1)) == 0)
72 3 {
73 4 rbuf [r_in & (RBUF_SIZE-1)] = SBUF;
74 4 r_in++;
75 4 }
76 3 }// if( P34 )
77 2 }
78 1 P34 = 1;
79 1 /*------------------------------------------------
80 1 Transmitted data interrupt.
81 1 ------------------------------------------------*/
82 1 if (TI != 0)
83 1 {
84 2 TI = 0;
85 2
86 2 if (t_in != t_out)
87 2 {
88 3 SBUF = tbuf [t_out & (TBUF_SIZE-1)];
89 3 t_out++;
90 3 ti_restart = 0;
91 3 }
92 2 else
93 2 {
94 3 ti_restart = 1;
95 3 }
96 2 }
97 1
98 1 }
*** WARNING C280 IN LINE 63 OF SIO.C: 'temp': unreferenced local variable
99
100 /*------------------------------------------------------------------------------
101 ------------------------------------------------------------------------------*/
102 #pragma disable
103
104 void com_initialize (void)
105 {
106 1 /*------------------------------------------------
107 1 Setup TIMER1 to generate the proper baud rate.
108 1 ------------------------------------------------*/
109 1 //com_baudrate (1200);
110 1
111 1 /*------------------------------------------------
112 1 Clear com buffer indexes.
113 1 ------------------------------------------------*/
114 1 t_in = 0;
C51 COMPILER V6.23a SIO 05/11/2007 22:24:42 PAGE 3
115 1 t_out = 0;
116 1
117 1 r_in = 0;
118 1 r_out = 0;
119 1
120 1 /*------------------------------------------------
121 1 Setup serial port registers.
122 1 ------------------------------------------------*/
123 1 SM0 = 0; SM1 = 1; /* serial port MODE 1 */
124 1 SM2 = 0;
125 1 REN = 1; /* enable serial receiver */
126 1
127 1 RI = 0; /* clear receiver interrupt */
128 1 TI = 0; /* clear transmit interrupt */
129 1 ti_restart = 1;
130 1
131 1 ES = 1; /* enable serial interrupts */
132 1 PS = 0; /* set serial interrupts to low priority */
133 1 }
134
135 /*------------------------------------------------------------------------------
136 ------------------------------------------------------------------------------*/
137 #pragma disable
138
139 void com_baudrate (
140 unsigned baudrate)
141 {
142 1 /*------------------------------------------------
143 1 Clear transmit interrupt and buffer.
144 1 ------------------------------------------------*/
145 1 TI = 0; /* clear transmit interrupt */
146 1 t_in = 0; /* empty transmit buffer */
147 1 t_out = 0;
148 1
149 1 /*------------------------------------------------
150 1 Set timer 1 up as a baud rate generator.
151 1 ------------------------------------------------*/
152 1 TR1 = 0; /* stop timer 1 */
153 1 ET1 = 0; /* disable timer 1 interrupt */
154 1
155 1 PCON |= 0x80; /* 0x80=SMOD: set serial baudrate doubler */
156 1
157 1 TMOD &= ~0xF0; /* clear timer 1 mode bits */
158 1 TMOD |= 0x20; /* put timer 1 into MODE 2 */
159 1
160 1 TH1 = (unsigned char) (256 - (XTAL / (16L * 12L * baudrate)));
161 1
162 1 TR1 = 1; /* start timer 1 */
163 1 }
164
165 /*------------------------------------------------------------------------------
166 ------------------------------------------------------------------------------*/
167 #pragma disable
168
169 char com_putchar (
170 unsigned char c)
171 {
172 1 /*------------------------------------------------
173 1 If the buffer is full, return an error value.
174 1 ------------------------------------------------*/
175 1 if (com_tbuflen () >= TBUF_SIZE)
176 1 return (-1);
C51 COMPILER V6.23a SIO 05/11/2007 22:24:42 PAGE 4
177 1
178 1 /*------------------------------------------------
179 1 Add the data to the transmit buffer. If the
180 1 transmit interrupt is disabled, then enable it.
181 1 ------------------------------------------------*/
182 1 tbuf [t_in & (TBUF_SIZE - 1)] = c;
183 1 t_in++;
184 1
185 1 if (ti_restart)
186 1 {
187 2 ti_restart = 0;
188 2 TI = 1; /* generate transmit interrupt */
189 2 }
190 1
191 1 return (0);
192 1 }
193
194 /*------------------------------------------------------------------------------
195 ------------------------------------------------------------------------------*/
196 #pragma disable
197
198 int com_getchar (void)
199 {
200 1 if (com_rbuflen () == 0)
201 1
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