📄 832slave.lst
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832SLAVE PAGE 1
1 ;********************************************************************
2 ;
3 ; Author : ADI - Apps www.analog.com/MicroConverter
4 ;
5 ; Date : April 2002
6 ;
7 ; File : SPIslave.asm
8 ;
9 ; Hardware : ADuC832
10 ;
11 ; Include File : UARTIO.asm - serial I/O routines
12 ;
13 ; Description : Demonstrates an example slave mode SPI interface.
14 ; Code is intended for use with companion code file
15 ; '832mstr.asm' running on a second MicroConverter
16 ; chip. Chips must have SCLK, MOSI, MISO, & GND pins
17 ; connected together, and P3.5 pin on master must
18 ; connect to SS pin on slave.
19 ;
20 ; If using the ADuC832 eval board, you can
21 ; simply connect the 10-pin SPI header directly
22 ; to that of the master board. However, you must
23 ; also ensure that LK5 ('SS master') is REMOVED on
24 ; the slave board, and INSERTED on the master board.
25 ;
26 ; Once hardware is connected, download code to both
27 ; master & slave devices ('832mstr' to the master,
28 ; '832slave' to the slave). Reset the slave first,
29 ; and then the master. The slave will sit with the
30 ; LED off until the master starts exchanging data
31 ; with it at which time its LED will start blinking
32 ; in sync (or 180皁ut of phase) with that of the
33 ; master. When first launched, both master and slave
34 ; are transmitting zeros repeatedly on the SPI port.
35 ; Pressing the INT0 button on either master or slave
36 ; increments the value it is transmitting. Received
37 ; SPI data is relayed out the UART and can be viewed
38 ; on any VT100 terminal or terminal emulator at
39 ; 9600baud/8bits/noparity/1stopbit. Characters sent
40 ; from the terminal to the MicroConverter will update
41 ; the value being transmitted by SPI.
42 ;
43 ;********************************************************************
44
45 $MOD832 ; Use 8052 & ADuC832 predefined symbols
46
00B4 47 LED EQU P3.4 ; P3.4 drives red LED on eval board
48
49 ;____________________________________________________________________
50 ; DEFINE VARIABLES IN INTERNAL RAM
---- 51 DSEG
0060 52 ORG 0060h
0060 53 INPUT: DS 1 ; data byte received by SPI
0061 54 OUTPUT: DS 1 ; data byte to send by SPI
55
56 ;____________________________________________________________________
57 ; BEGINNING OF CODE
---- 58 CSEG
832SLAVE PAGE 2
59
0000 60 ORG 0000h
0000 02004B 61 JMP MAIN ; jump to main program
62
63 ;____________________________________________________________________
64 ; INTERRUPT VECTOR SPACE
0003 65 ORG 0003h ; (.................... INT0 ISR)
66
0003 0561 67 INC OUTPUT
0005 32 68 RETI
69
003B 70 ORG 003Bh ; (.................... SPI ISR)
71
003B 85F760 72 MOV INPUT,SPIDAT ; get data just received by SPI
003E 8561F7 73 MOV SPIDAT,OUTPUT ; update next byte to transmit
0041 C3 74 CLR C ; clear C indicates transfer complete
0042 32 75 RETI
76
77 ;====================================================================
78 ; MAIN PROGRAM
004B 79 ORG 004Bh
80
004B 81 MAIN:
82
004B 758107 83 MOV SP,#007h
84
85 ; CONFIGURE UART...
004E 759E82 86 MOV T3CON,#082h
0051 759D2D 87 Mov T3FD,#02Dh
0054 759852 88 MOV SCON,#052h
89
90 ; CONFIGURE SPI...
91
0057 75F824 92 MOV SPICON,#024h ; configure SPI port for:
93 ; CPHA=1, CPOL=0, slave
005A 75A901 94 MOV IEIP2,#1 ; enable SPI interrupt
95
96 ; CONFIGURE INTERRUPT 0...
97
005D D288 98 SETB IT0 ; INT0 edge triggered
005F D2A8 99 SETB EX0 ; enable INT0 interrupt
100
101 ; ENABLE INTERRUPTS & ENTER MAIN LOOP...
102
0061 756100 103 MOV OUTPUT,#0 ; set initial value for output byte..
0064 75F700 104 MOV SPIDAT,#0 ; ..including very fisrt output byte
0067 D2AF 105 SETB EA ; enable inturrupts
106
0069 B2B4 107 LOOP: CPL LED ; flash the LED on the eval board
006B D3 108 SETB C
006C 40FE 109 JC $ ; wait here to receive SPI transfer
006E E560 110 MOV A,INPUT ; send value received by SPI..
0070 1200A3 111 CALL SENDVAL ; ..out the UART as 2 hex chars
0073 90011E 112 MOV DPTR,#SEPERATOR ; send line-feed & crdg-return..
0076 120083 113 CALL SENDSTRING ; ..out the UART
0079 3098ED 114 JNB RI,LOOP ; repeat (unless UART data received)
115
116 ; WHEN UART DATA RECEIVED, MOVE DATA TO SPI OUTPUT...
832SLAVE PAGE 3
117
007C 859961 118 MOV OUTPUT,SBUF ; update OUTPUT byte to new value
007F C298 119 CLR RI ; must clear RI
0081 80E6 120 JMP LOOP ; back to main loop
121
122 ;____________________________________________________________________
123 ; SUBROUTINE INCLUDE FILE
124
=1 125 $INCLUDE(UARTIO.asm)
=1 126 ;********************************************************************
=1 127 ;
=1 128 ; Author : ADI - Apps www.analog.com/MicroConverter
=1 129 ;
=1 130 ; Date : January 2001
=1 131 ;
=1 132 ; File : UARTIO.asm
=1 133 ;
=1 134 ; Hardware : any 8051 based microcontroller or MicroConverter
=1 135 ;
=1 136 ; Description : standard UART I/O subroutines. total size of this
=1 137 ; code when assembled is 155 bytes. routines for use
=1 138 ; external to this file are:
=1 139 ;
=1 140 ; SENDSTRING - sends a string of characters
=1 141 ; SENDCHAR - sends a single character
=1 142 ; SENDVAL - sends a byte as 2 ASCII characters
=1 143 ; HEX2ASCII - converts from HEX to ASCII
=1 144 ; ASCII2HEX - converts from ASCII to HEX
=1 145 ; GETCHAR - gets a single character
=1 146 ; GETVAL - gets a byte as 2 ASCII characters
=1 147 ;
=1 148 ;********************************************************************
=1 149
=1 150 ;____________________________________________________________________
=1 151 ; SENDSTRING
=1 152
0083 =1 153 SENDSTRING: ; sends ASCII string to UART starting at location
=1 154 ; DPTR and ending with a null (0) value
=1 155
0083 C0E0 =1 156 PUSH ACC
0085 C0F0 =1 157 PUSH B
0087 E4 =1 158 CLR A
0088 F5F0 =1 159 MOV B,A
008A E5F0 =1 160 IO0010: MOV A,B
008C 05F0 =1 161 INC B
008E 93 =1 162 MOVC A,@A+DPTR
008F 6005 =1 163 JZ IO0020
0091 12009B =1 164 CALL SENDCHAR
0094 80F4 =1 165 JMP IO0010
0096 D0F0 =1 166 IO0020: POP B
0098 D0E0 =1 167 POP ACC
=1 168
009A 22 =1 169 RET
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