• State Not Answered
  • Locked Locked
  • Replies 1 reply
  • Subscribers 22 subscribers
  • Views 677 views
  • Users 0 members are here
Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

MMC read block uses (HIGH(varh)); HIGH not CCS C recognised

graham kingsley

Hello Ed Waugh,

Thanks a lot for your code re: reading/writing SD/MMC cards.

In the read/write block functions you use

SPI_WRITE(HIGH)varh));

where is HIGH and LOW defined? presumably it shifts the bits into an 8 bit integer for the SPI but the compiler does not recognise it and my eforts to emulate dont appear to work.

Best regards

Graham

  • 0

    Macros to play with low and high byte are normally used as HIGH(var) - not (HIGH)var.

    Anyway - if you know your shift instructions, and how to mask bits, it's trivial to implement a macro HIGH() to pick up high byte of a 16-bit number and LOW() to pick up low byte.