interfacing MMA7660FC with at89s52
Tue Mar 15 2011, 01:38 am
The flow of your program is not clear.
It probably crashes somewhere near..
I suggest you put your assembly start up code into a "C" function to get it
out of the way.
It probably crashes somewhere near..
mov r7,#98h // device address 0x98 mov r6,#00h // starting address mov r5,#99h // read mode call read_block mov a,r0 init: setb sda setb scl ret
I suggest you put your assembly start up code into a "C" function to get it
out of the way.
Wed Mar 16 2011, 12:47 pm
I do not know how you and your controller mma7660fc interface, can provide your schematic, so I can help you better?
Wed Mar 16 2011, 11:39 pm
still does not work.
#include<reg51.h>
sbit SDA = P3^6;
sbit SCL = P3^7;
#define stepper P1
void motor_cw(unsigned int);
void delay();
void i2c_acc();
void main(void)
{
unsigned int x_axis=0;
i2c_acc();
if(ACC>
=0x00 && ACC<=0x16)
{
x_axis=((((-149*ACC)/1000)*ACC-(64*ACC)/1000+78)*10)/72;
motor_cw(x_axis);
}
else if(ACC>
=0x2B && ACC<=0x3F)
{
x_axis=((((180*ACC)/1000)-(23*ACC)+824)*10)/72;
motor_cw(x_axis);
}
}
void i2c_acc(void)
{
#pragma asm
mov scon,#0x50 // initilaizing serial port at 9600 @ 11.0592MHz
mov tmod,#0x20
mov th1,#0xfd
mov tl1,#0xfd
setb tr1
acall init
//active mode
mov r7,#98h // device address 0x98
mov r6,#07h // write to mode reg
mov r5,#01h // write mode reg to 00000001
acall write_byte // all is done in this function
mov 0x41,#20
call delayms
mov 0x41,#20
call delayms
mov r7,#98h // device address 0x98
mov r6,#00h // starting address
mov r5,#99h // read mode
call read_block
mov a,r0
init:
setb sda
setb scl
ret
read_block:
call start
jc x35
mov a,r7
call shout
jc x34
mov a,r6
call shout
jc x34
call start
jc x34
mov a,r5 //read form mma7660 read addres 0x99
call shout
jc x34
// read from register 0
call shin
mov r0,a
call ACK
// read from register 1
call shin
mov r1,a
call ACK
// read from register 2
call shin
mov r2,a
call ACK
call NAK
clr c
x34:
call stop
x35:
ret
write_byte:
call start
jc x49
mov a,r7
call shout
jc x48
mov a,r6
call shout
jc x48
mov a,r5
call shout
jc x48
clr c
x48:
call stop
x49:
ret
start:
setb SDA
setb SCL
jnb SDA, x40
jnb SCL, x40
nop
clr SDA
nop
nop
nop
nop
nop
clr SCL
clr c
jmp x41
x40:
setb c
x41:
ret
stop:
clr SCL
clr SDA
nop
nop
setb SCL
nop
nop
nop
nop
nop
setb SDA
ret
shout:
mov b, #8
x42:
rlc a
mov SDA, c
nop
setb SCL
nop
nop
nop
nop
clr SCL
djnz b, x42
setb SDA
nop
nop
setb SCL
nop
nop
nop
nop
mov c, SDA
clr SCL
ret
shin:
setb SDA
mov b, #8
x43:
nop
nop
nop
setb SCL
nop
nop
mov c, SDA
rlc a
clr SCL
djnz b, x43
ret
ACK:
clr SCL
clr SDA
nop
nop
setb SCL
nop
nop
nop
nop
clr SCL
ret
NAK:
clr SCL
setb SDA
nop
nop
setb SCL
nop
nop
nop
nop
clr SCL
ret
delayms:
mov 0x40,#230
d:
nop
nop
djnz 0x40,d
djnz 0x41,delayms
ret
#pragma endasm
}
void motor_cw(unsigned int cntrx)
{
unsigned int a;
for(a=0;a<cntrx;a++)
{
stepper = 0x08;
delay();
stepper = 0x0C;
delay();
stepper = 0x04;
delay();
stepper = 0x06;
delay();
stepper = 0x02;
delay();
stepper = 0x03;
delay();
stepper = 0x01;
delay();
stepper = 0x09;
delay();
}
}
void delay()
{
unsigned char l,m,n;
for(l=0;l<6;l++)
for(m=0;m<255;m++)
for(n=0;n<255;n++);
} Wed Mar 16 2011, 11:51 pm
when a source code is generated for this file it always shows a continuous loop even though the program is designed such that it must run once. can anyone comment on that. it is in the main: segment. there is a ret before end of main program. also the source code has essentially converted the lengthy if else condition and the formula in assembly level code. can somebody help me integrating that in the assembly code that is already working???? is it prudent to do so.....
Thu Mar 17 2011, 02:46 am
Now it crashes near
To run just once add a while loop..
Try a simpler test for now, such as
}
else if(ACC>
=0x2B && ACC<=0x3F)
{
x_axis=((((180*ACC)/1000)-(23*ACC)+824)*10)/72;
motor_cw(x_axis);
}
}
}To run just once add a while loop..
}
else if(ACC>
=0x2B && ACC<=0x3F)
{
x_axis=((((180*ACC)/1000)-(23*ACC)+824)*10)/72;
motor_cw(x_axis);
}
while(1);
}
Try a simpler test for now, such as
if(ACC> =60) motor_cw(5); else motor_acw(5);
omega123 like this.
Sat Mar 19 2011, 07:06 pm
@experimenterUK i tried what u told....and for once it worked. i set the accelerometer in test mode, wrote the value 1 to the X axis register and then put the condition that
it worked.
if(x1==1) motor_cw(1); else motor_cw(2);
it worked.
Sun Mar 20 2011, 10:19 am
@ omega123
can u upload ur final project folder which u make now
i am trying to mixing asm and c as u try but in this manner some error comes
can u upload ur final project folder which u make now
i am trying to mixing asm and c as u try but in this manner some error comes
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