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SPI Can't work of PIC18452

 
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sindyvirgo



Joined: 15 Jan 2009
Posts: 8

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SPI Can't work of PIC18452
PostPosted: Thu Jan 15, 2009 1:16 am     Reply with quote
Experiment board : Microchip App001
--------------------------------------------------------------------
I use SPI to write PIC and EEPROM (25LC160A)
Could you tell me how I should do ?
I have tried the following ways ...
--------------------------------------------------------------------

Code:
#define SPI_MODE_1  (SPI_L_TO_H)

setup_psp(PSP_DISABLED);
setup_spi(SPI_MASTER|SPI_MODE_1|SPI_CLK_DIV_16);


void main()
{
//write to spi
output_low(CS);
SPI_write(0x06);
SPI_write(0x02);                  
spi_write(0x00);         
spi_write(0x10);                               
spi_write('A');
delay_us(100);       
output_high(CS);

//read from spi
output_low(pin_a5);                  
SPI_write(0x03);                             
spi_write(0x00);             
spi_write(0x10);                   
SPI_Msg = SPI_read();                                    
output_high(pin_a5);

if(spi_data_is_in())
{
   SPI_Msg = SPI_read();     
   printf("%c",SPI_Msg);
}
}

My procedure can't work, please help me !!
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Jan 15, 2009 2:59 am     Reply with quote
You problem is that you need a driver for the 25LC160A.

You have SPI mode 1 selected, but the data sheet says it uses
modes 0 or 3. Look at the timing diagram on page 5 on the left side:
Quote:
FIGURE 1-2: SERIAL INPUT TIMING

It gives those two modes (in binary notation). 25LC160A data sheet:
http://ww1.microchip.com/downloads/en/DeviceDoc/21807D.pdf

Here's an example of a hardware SPI driver for the 25LC640.
I think it will work for the 25LC160A. Try it.
http://www.ccsinfo.com/forum/viewtopic.php?t=28199&start=1
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