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yayodiaz44
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| BIIIIIG PROBLEM. Help please. |
 Posted: Fri Jul 15, 2005 1:31 pm |
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Hi. I need your help. I really have a big problem.
I only want to know how can I access to a variable's bit?
I will be grateful with you all my life
Thank you. Don`t forget me
Alvaro |
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Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
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| Posted: Fri Jul 15, 2005 1:48 pm |
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That's a little problem 
There are a couple of ways but here is method:
bit_test(my_var,0)
bit_set(my_var,1)
bit_clear(my_var,2)
Last edited by Mark on Fri Jul 15, 2005 2:07 pm; edited 1 time in total |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Jul 15, 2005 1:50 pm |
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| Quote: | | I only want to know how can I access to a variable's bit? |
Here are several ways to use bit variables in CCS:
| Code: | #include <16F877.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
// Method 1:
// In CCS, the "short" data type is 1 bit.
// The compiler will handle assigning a RAM byte address
// to hold it. The compiler will put up to 8 "short"
// variables in that byte.
short my_short;
// Method 2:
// You can declare the byte variable yourself, and then
// declare bit variables within it, by using the #bit
// statement.
int8 my_var;
#bit my_bit0 = my_var.0
#bit my_bit1 = my_var.1
#bit my_bit2 = my_var.2
#bit my_bit3 = my_var.3
#bit my_bit4 = my_var.4
#bit my_bit5 = my_var.5
#bit my_bit6 = my_var.6
#bit my_bit7 = my_var.7
// Method 3:
// You can create a structure of bitfields that are 1 bit wide.
struct
{
short Bit0 : 1;
short Bit1 : 1;
short Bit2 : 1;
short Bit3 : 1;
short Bit4 : 1;
short Bit5 : 1;
short Bit6 : 1;
short Bit7 : 1;
}my_bits;
//======================
void main()
{
my_short = 1;
printf("my_short = %u \n\r", my_short);
my_bit0 = 1;
printf("my_bit0 = %u \n\r", my_bit0);
my_bits.Bit0 = 1;
printf("my_bits.Bit0 = %u \n\r", my_bits.Bit0);
while(1);
} |
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