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code for MCP3202 with 18f4550 !!!!

 
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slyfox



Joined: 20 Sep 2007
Posts: 11
Location: GRENOBLE FRANCE

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code for MCP3202 with 18f4550 !!!!
PostPosted: Sun Feb 07, 2010 12:17 pm     Reply with quote
now it's ok !!!
just few lines to use the MCP3202 , 12 bits analog to digital converter , with pic microcontroller :

USE spi hardware if you can !

Code:

#use spi(FORCE_HW, BITS=16,SAMPLE_RISE, BAUD=1000000)

#define CS1  PIN_C6
#define DIN  PIN_C7
#define DOUT PIN_B0
#define CLK  PIN_B1

in your main program or function :
Code:

int8 msb, lsb;
int16 value;

// for first channel reading

output_low(cs1);
spi_write(0x01); // start bit
msb=spi_read(0xC0); // first channel in single mode and read first byte
lsb=spi_read(0x00); // read second byte
output_high(CS1);
value=make16(msb,lsb); //convert to 16 bits
value=value & 0x0fff;  // forced fourth first msb bits to zero

print value to read result !!!!

// for second channel reading
Code:

output_low(cs1);
spi_write(0x01); // start bit
msb=spi_read(0x80); // second channel in single mode and read first byte
lsb=spi_read(0x00); // read second byte
output_high(CS1);
value=make16(msb,lsb); //convert to 16 bits
value=value & 0x0fff;  // forced fourth first msb bits to zero


hope it is useful !!
glk.c.93



Joined: 27 Jun 2012
Posts: 9
Location: India

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re:
PostPosted: Mon Jul 09, 2012 2:57 am     Reply with quote
If you are transferring 16 bits at a time, then while
reading data to a 8 bit number, which 8 bits do we get ?
Do we get 16/8 bit value while we read ?
Did you check the program practically ?
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