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kmp84
Joined: 02 Feb 2010
Posts: 354
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| make8() help |
 Posted: Mon Mar 21, 2011 5:43 am |
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Hi Friends !
Anybody help about this problem : | Code: |
#include <16F628A.H>
#device *=16
//#device adc=8
#fuses NOWDT,HS,PUT,NOPROTECT,BROWNOUT,NOCPD,NOMCLR
#use delay(clock=11 059 200)
#use rs232(baud=9600,rcv=PIN_B1,xmit=PIN_B2,errors)
float temperature;
//.......................................
void send_packet (float *data) //
{
int i;
tx_buffer[0]=stx;
tx_buffer[1]=0x12;//cop_send temp
tx_buffer[2]=address;
tx_buffer[3]=0x00;//errors
tx_buffer[4]=0x04;//lenght of data field
tx_buffer[5]=0x11; //make8(data,0);
tx_buffer[6]=0x12; //make8(data,2);
tx_buffer[7]=0x13; //make8(data,1);
tx_buffer[8]= make8(data,0);// <------------------PROBLEM!!!!
tx_buffer[9]=get_checksum(tx_buffer,9);
tx_buffer[10]=etx;
for (i=0;i<=10;i++)
{
putc(tx_buffer[i]);
}
}
//.......................
send_packet(temperature);
[quote] compiler ver: PCM 4.104
says : "Invalid parameters to built in function "[/quote] |
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temtronic
Joined: 01 Jul 2010
Posts: 9245
Location: Greensville,Ontario
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| Posted: Mon Mar 21, 2011 5:57 am |
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The compiler may not like the spaces in the
#use delay(clock=11 059 200)
I know it confused me !
just try
#use delay(clock=11059200) or
#use delay(clock=11,059,200)
please check the CCS help file ( press F11),it says exactly how to use/format the directive. |
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kmp84
Joined: 02 Feb 2010
Posts: 354
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| Posted: Mon Mar 21, 2011 6:25 am |
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I checked this,,, but it's no my problem.
My problem is function " make8()". I accept float argument *data in my funct. "void send_packet (float *data)" and then try to make four bytes.. |
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Wayne_
Joined: 10 Oct 2007
Posts: 681
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| Posted: Mon Mar 21, 2011 8:18 am |
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| Code: |
void send_packet (float *data) //
{
int i;
tx_buffer[0]=stx;
tx_buffer[1]=0x12;//cop_send temp
tx_buffer[2]=address;
tx_buffer[3]=0x00;//errors
tx_buffer[4]=0x04;//lenght of data field
tx_buffer[5]=0x11; //make8(data,0);
tx_buffer[6]=0x12; //make8(data,2);
tx_buffer[7]=0x13; //make8(data,1);
tx_buffer[8]= make8(data,0);// <------------------PROBLEM!!!!
tx_buffer[9]=get_checksum(tx_buffer,9);
tx_buffer[10]=etx;
for (i=0;i<=10;i++)
{
putc(tx_buffer[i]);
}
}
//.......................
send_packet(temperature);
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your function is expecting an address (float *data)
You are sending it a value
send_packet(temperature);
Try
send_packet(&temperature);
to send the address of the variable. |
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Wayne_
Joined: 10 Oct 2007
Posts: 681
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| Posted: Mon Mar 21, 2011 8:25 am |
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You also have another problem
| Quote: | From the help.
Syntax:
i8 = MAKE8(var, offset)
Parameters:
var is a 16 or 32 bit integer.
offset is a byte offset of 0,1,2 or 3.
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It appears MAKE8 does not take floats. you could force it to an int32 but the compiler would convert it.
try i8 = *(data[0]);
or
i8 = *(data[3]);
It realy depends on what you are after. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19549
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| Posted: Mon Mar 21, 2011 8:34 am |
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Several answers, and two comment.
First the comments - what is the point of declaring 'temperature' as global?.
Second, 'data', is a pointer _to_ a float value, not the value, in the function, but you are passing the value itself. basic 'typing' error here....
1) Use a union, instead of make8. This is my 'preferred' way, since make8, is CCS specific, while unions are generic C. So:
| Code: |
union {
int8 b[4];
float fpval;
} value;
value.fpval=12345.4;
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Then value.b[0] to b[3] are the four bytes.
You can also put bytes into value.b[x], then use the floating point result....
Also, because of the 'leniency' of C regarding typing, you can declare such a union, and have your own function, like:
| Code: |
union converter {
int8 b[4];
float fpval;
} ;
int do_something(union converter val) {
//Access the bytes here as val.b[0] to b[3]
}
//But call the function with:
float fred;
fred=12345.6;
do_something(fred);
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2) take advantage of the fact you are passing a pointer. If you don't want to use the value inside the function, simply tell the function that you are handing it a pointer to an integer, not a float. So:
| Code: |
void send_packet (int8 *data) //
{
//data[0], to data[3], are the four bytes of the float value.....
}
//But you then need to call with the _address_ of the number,
//not the number. So:
send_packet(&temperature);
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3) Since the value is global, don't pass the value to the function, but just write the function to access the value directly, and use a byte statement, to give access to this. So:
| Code: |
float temperature; //Value
int32 int_version;
#byte int_version=temperature;
//Then anywhere in your code,
make8(int_version,0); //Through to 3
//Will access the bytes making up 'temperature'
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Best Wishes |
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kmp84
Joined: 02 Feb 2010
Posts: 354
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| Posted: Wed Mar 23, 2011 2:52 pm |
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Thanks for your help developers.  |
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