MAX7219 and built-in SPI commands (CCS C)

[The Puma]

Please can someone post a source with use the built-in SPI command from CCS-C

Commands are:
setup_spi, write_spi

The code has only put an 1 on digit 1, that's all

I can't get it work

[sebdey]

The max7219 is not spi compatible, the max7221 IS the spi display driver.

Please find my code for the spi driver, read it, and if you don't understand something, don't hesitate to ask... (but take the time to read the code)

MAX7221.h

[sebdey]

I can't give you the CCS command for setting the SPI, I'm directly writing to the pic registers, if someone in this forum can translate these values in CCS, please don't hesitate to do it...

[The Puma]

I have a board with the MAX7219 with 8 7-segment displays.
can i replace the max7219 with te max7221??

[sebdey]

No, my fault, I didn't read the dadasheet carefully enough, the 7219 IS spi compatible... sorry

So you can just use the code provided as is!

Good luck !!

[The Puma]

[sebdey]

Yes, the 7221 is the SPI compatible chip, but what I wanted to say is that the serial interface of the 7219 is also compatible with SPI, if you look on page 6, you'll see that the signals (Data, Clock, Load/_CS) are the same.

[The Puma]

I can't compile this code
Get 21 errors

Is this code for CCS-C??

UPDATE

Fault found (intensity double)


void setDisplayIntensity(int intensity)
{
if(intensity<16)
{
output_low(MAX7221_CS);
delay_cycles(4);

spi_write(INTENSITY);
spi_write(intensity);

output_high(MAX7221_CS);
}
}


I need a source code to count from 0 to 9999999
Please can someone help?

[-sebdey]

Of course this is ccs code, and works very well for me...
But you need to create your main.c, make sure that all needed declarations are done, and maybe also understand the code and what you are doing...
It will need some personal work...

If you want to find someone that makes everything for you, I am not the right person, sorry...

[The Puma]

It working so far.

But it counts only to 65536. Why??? Is haved used long variables
Howcan i count further than 65536?

void writeDisplayValue(unsigned long value)
{
dig5 = (value%1000000)/100000;
setDisplayDigit(DIGIT_5,dig5);
dig4 = (value%100000)/10000;
setDisplayDigit(DIGIT_4,dig4);
dig3 = (value%10000)/1000;
setDisplayDigit(DIGIT_3,dig3);
dig2 = (value%1000)/100;
setDisplayDigit(DIGIT_2,dig2);
dig1 = (value%100)/10;
setDisplayDigit(DIGIT_1,dig1);
dig0 = (value%10);
setDisplayDigit(DIGIT_0,dig0);
}


void main()
{
unsigned long tel;

setup_spi(SPI_MASTER | SPI_H_TO_L | SPI_CLK_DIV_16);

setDisplayDecodeMode(BCD_ALL);
setDisplayIntensity(7);
setDisplayDigitsCount(6);
setDisplayTest(NORMAL_MODE);
setDisplayOnOffState(TRUE);


while (1)
{
writeDisplayValue(tel);
tel++;
delay_ms(5);
}
}

[newguy]

This is why I never use words like "long" when I declare variables. A long int is 16 bits in CCS, thus the reason your counter tops out at 65,535.

Try an int32 instead.

[Guest]

Does this work on a 7219?

I've defined the CS pin, and output a test digit but with no go. The digit pins are all high, and the segments are all low =/

[Guest]

Oh sorry oops forgot to setup_spi (: ..now it responds but it still doesn't work. Segments doesn't go high

[Guest]

Good driver, but how do I turn on/off a segment DP without changing any other segments? For example the display already shows 123, and I want to turn on the decimal 12.3

[Guest]

Whoops wrong one. I'm actually using the bit bang one, how do I turn on DP? I'm not fluent with this stuff, more with PHP (: