CCS C Software and Maintenance Offers
FAQFAQ   FAQForum Help   FAQOfficial CCS Support   SearchSearch  RegisterRegister 

ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

CCS does not monitor this forum on a regular basis.

Please do not post bug reports on this forum. Send them to support@ccsinfo.com

Arduino compatible bit macros (bitSet, bitClear, etc.)

 
Post new topic   Reply to topic    CCS Forum Index -> Code Library
View previous topic :: View next topic  
Author Message
allenhuffman



Joined: 17 Jun 2019
Posts: 540
Location: Des Moines, Iowa, USA

View user's profile Send private message Visit poster's website

Arduino compatible bit macros (bitSet, bitClear, etc.)
PostPosted: Tue Feb 25, 2020 1:38 pm     Reply with quote

To aid in porting Arduino code over, I have my own macros that replicate the ones Arduino uses to set, test, clear, etc. bits. These is also a test program to use them all, but it's for standard C and would need a few changes to run on the PIC.

Source: https://subethasoftware.com/2020/02/07/arduino-compatible-bit-macros/

Code:
#ifndef BITMACROS_H
#define BITMACROS_H

// Bit macros, based on Arduino standard.
// https://www.arduino.cc/reference/en/language/functions/bits-and-bytes/bit/
//
// x: the numeric variable to which to write.
// n: which bit of the number to write, starting at 0 for the least-significant (rightmost) bit.
// b: the value to write to the bit (0 or 1).

#define bit(n)              (1 << (n))

#define bitSet(x, n)        ((x) |= bit(n))

#define bitClear(x, n)      ((x) &= ~bit(n))

#define bitRead(x, n)       (((x) & bit(n)) !=0 )

#define bitWrite(x, n, b)   ((b) ? bitSet((x), (n)) : bitClear((x), (n)))

/* Verification tests:
bool showBits (uint32_t value, unsigned int bits)
{
    bool status;

    //printf ("showBits (%u, %u)\n", value, bits);

    if ((bits == 0) || (bits > sizeof(value)*8))
    {
        status = false;
    }
    else
    {
        // Must use signed to check against 0.
        for (int bit = (bits-1); bit >= 0; bit--)
        {
            printf ("%u", bitRead(value, bit));
        }
        printf ("\n");
    }

    return status;
}

int main()
{
    unsigned int value;

    // Test bit()
    for (unsigned int bit = 0; bit < 8; bit++)
    {
        printf ("bit(%u) = %u\n", bit, bit(bit));
    }

    printf ("\n");

    // Test bitSet()
    for (unsigned int bit = 0; bit < 8; bit++)
    {
        value = 0;
        printf ("bitSet(%u, %u) = ", value, bit);
        bitSet(value, bit);
        showBits (value, 8);
    }

    printf ("\n");

    // Test bitClear()
    for (unsigned int bit = 0; bit < 8; bit++)
    {
        value = 0xff;
        printf ("bitClear(%u, %u) = ", value, bit);
        bitClear (value, bit);
        showBits (value, 8);
    }

    printf ("\n");

    // Test bitRead()
    value = 0b10101111;
    showBits (value, 8);
    for (unsigned int bit = 0; bit < 8; bit++)
    {
        printf ("bitRead(%u, %u) = %u\n", value, bit, bitRead (value, bit));
    }

    printf ("\n");

    // Test bitWrite - 1
    value = 0x00;
    showBits (value, 8);
    for (unsigned int bit = 0; bit < 8; bit++)
    {
        printf ("bitWrite(%u, %u, 1) = ", value, bit);
        bitWrite (value, bit, 1);
        showBits (value, 8);
    }
    // Test bitWrite - 0
    showBits (value, 8);
    for (unsigned int bit = 0; bit < 8; bit++)
    {
        printf ("bitWrite(%u, %u, 0) = ", value, bit);
        bitWrite (value, bit, 0);
        showBits (value, 8);
    }

    printf ("\n");

    return EXIT_SUCCESS;
}
*/

#endif // BITMACROS_H
// End of BitMacros.h

_________________
Allen C. Huffman, Sub-Etha Software (est. 1990) http://www.subethasoftware.com
Embedded C, Arduino, MSP430, ESP8266/32, BASIC Stamp and PIC24 programmer.
http://www.whywouldyouwanttodothat.com ?
Display posts from previous:   
Post new topic   Reply to topic    CCS Forum Index -> Code Library All times are GMT - 6 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group