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ccs c book

 
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sifirzero1



Joined: 14 Dec 2022
Posts: 37

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ccs c book
PostPosted: Wed Jan 04, 2023 2:21 pm     Reply with quote

sifirzero1



Joined: 14 Dec 2022
Posts: 37

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PostPosted: Wed Jan 04, 2023 2:22 pm     Reply with quote

Who has the book on this site? Would you sell or gift the book? thanks

http://janniehamman.co.za/
temtronic



Joined: 01 Jul 2010
Posts: 9081
Location: Greensville,Ontario

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PostPosted: Sat Jan 07, 2023 9:35 am     Reply with quote

One of the best ways to learn CCS C , is to look at the 100s of example programs that CCS supplies in the 'examples' folder !
You can also see working programs in the 'code library' on this forum.

I went to the website for that book, but didn't see any examples of his code
sifirzero1



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PostPosted: Sat Jan 07, 2023 9:42 am     Reply with quote

because the book is on sale. didn't share much
temtronic



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PostPosted: Sat Jan 07, 2023 10:26 am     Reply with quote

Most writers will show a sample of what's inside the book.
I will NOT buy that book without seeing something.

Would you buy a car without actually seeing it ?
sifirzero1



Joined: 14 Dec 2022
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PostPosted: Sat Jan 07, 2023 10:32 am     Reply with quote

website has samples at the bottom of the page and images from the book
temtronic



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PostPosted: Sat Jan 07, 2023 10:47 am     Reply with quote

hmm, I didn't scroll down to the end...just to the 'buy it now' info...
I did download the 7segment code.
It has an error in the first few lines..

hint the PIC doesn't have a 16 bit ADC...
sifirzero1



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PostPosted: Sat Jan 07, 2023 11:25 pm     Reply with quote

shall I not buy the book? is it naughty
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Sun Jan 08, 2023 1:50 pm     Reply with quote

I say don't buy. His Accelerometer program has bugs.
http://janniehamman.co.za/progs/accel355.c

In his main loop, he is not doing the acquisition delay after changing the
adc channels:
Code:
void main()
{
   setup_adc_ports(sAN0|sAN1|sAN2);
   setup_adc(ADC_CLOCK_INTERNAL);

   while(TRUE)
   {

      set_adc_channel(0);
      rax=read_adc();
      ax=calcxy(rax);   
     
      set_adc_channel(1);
      ray=read_adc();
      ay=calcxy(ray);
     
      set_adc_channel(2);
      raz=read_adc();
      az=calcz(raz);
     

The acquisition time is given in this section of the 16F88 data sheet:
12.1 A/D Acquisition Requirements (page 119)
It is listed in the equations as 19.72 us. His code should look like this:
Quote:

set_adc_channel(0);
delay_us(20);
rax=read_adc();
ax=calcxy(rax);

set_adc_channel(1);
delay_us(20);
ray=read_adc();
ay=calcxy(ray);

set_adc_channel(2);
delay_us(20);
raz=read_adc();
az=calcz(raz);


Also, his ADC setup is this:
Code:
setup_adc(ADC_CLOCK_INTERNAL);

But the 16F88 data sheet says on page 120:
Quote:
2: When the device frequencies are greater than 1 MHz, the RC A/D
conversion clock source is only recommended for Sleep operation.

He is running at 8MHz, therefore his setup should be:
Code:
setup_adc(ADC_CLOCK_DIV_16)

The DIV_16 value comes from this table in the PIC data sheet:
TABLE 12-1: TAD vs. MAXIMUM DEVICE OPERATING FREQUENCIES
on page 120. 16F88 data sheet:
https://ww1.microchip.com/downloads/en/devicedoc/30487c.pdf
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