TLC2543 Help me please !! ( TLC2543 Hi-tech C to CCSC Code)

[sirisopa]

#include <pic.h>

/*

Freely distributable in this original form.
(c) Feb 2000 Shane Tolmie
(c) KeyGhost, now you can record keystrokes on PC with tiny device
Any questions or comments? shane@keyghost.com
Updates to FAQ available from http://www.keyghost.com/htpic

Routines to setup and use the TLC2543 serial 11channel 12bit a/d converter.

For Hi-Tech C v7.85, on a generic PIC micro.

Tested with PIC16F84, PIC12CE674, and PIC16F876 all @ 4Mhz, should work at 16Mhz

Code status: tested and works beautifully.

- the current channel is set by the previous channel supplied
- initially two calls must be made to ad_setgetchannel(), or use slower ad_getchannel(x)

Sample C:

ad_setup(); //sets up port directions

garbage=ad_setgetchannel(0); //sets up current channel to zero, garbage returned
data=ad_setgetchannel(1); //data now has channel 0. Channel for next call is 1
data=ad_setgetchannel(2); //data now has channel 1. Channel for next call is 2

alternatively, use the slower, but more intuitive

ad_getchannel(x). //this uses two calls to return data at channel x.

WARNING: these chips are static sensitive - I had two cease to work on me for some reason.

*/

#define io_clk RB0 //clock on port B bit 7
#define io_clk_dir TRISB0 //clock on port B bit 7
#define ad_data_in RB1
#define ad_data_in_dir TRISB1

#define ad_data_out RB2 //data on port A bit 1
#define ad_data_out_dir TRISB2 //data on port A bit 1
#define ad_cs RB3
#define ad_cs_dir TRISB3

#define port_out 0
#define port_in 1

//call this once to set it up
void ad_setup()
{
//these in/outs are a bit confusing - its from the TLC2543's perspective
ad_data_in_dir = port_out;
ad_data_out_dir = port_in;

io_clk_dir = port_out;
ad_cs_dir = port_out;
}

unsigned int ad_setgetchannel(unsigned char channel)
{
signed char i;
unsigned int data = 0x0;
unsigned int ch_config;

ch_config = channel<<8;

io_clk = 0; //ensure clock is low
ad_cs = 0;
for(i=11; i>=0; i--)
{

ad_data_in = ((ch_config>>i) & 0x01); //bit to send

data <<= 1; //read the next bit
data |= ad_data_out;
io_clk = 1; //ensure clock is high
io_clk = 0; //ensure clock is low
}
ad_cs = 1;
return data;
}

//recommended routine to call, its only a little slower
unsigned int ad_getchannel(unsigned char channel)
{
unsigned int dummy;
// call it twice to get and set the channel
dummy=ad_setgetchannel(channel); //get garbage channel, but set next one
dummy=ad_setgetchannel(channel); //get current channel
return dummy;
}

[sirisopa]