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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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 Posted: Thu Nov 01, 2007 2:46 pm |
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Try a more simple program:
| Code: | #include <16F628A.H>
#fuses XT,NOWDT,PUT,NOBROWNOUT,NOLVP
#use delay(clock=4000000)
#use i2c(master, scl=PIN_A2, sda=PIN_A3)
#include <flex_lcd.c>
//-----------------------------------
#define MCP3021_READ_ADDR 0b10011011
int16 read_mcp3021(void)
{
int8 lsb;
int8 msb;
int16 retval;
i2c_start();
i2c_write(MCP3021_READ_ADDR);
msb = i2c_read();
lsb = i2c_read(0);
i2c_stop();
retval = make16(msb, lsb) >> 2;
return(retval);
}
//============================
void main()
{
int16 result;
lcd_init();
while(1)
{
result = read_mcp3021();
printf(lcd_putc, "\f%lx ", result);
delay_ms(500);
}
} |
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Doglao
Joined: 26 Mar 2007
Posts: 11
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| Posted: Thu Nov 01, 2007 4:06 pm |
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Thanks for all!
it is working now!
I put a 11us delay before read the data, this delay is necessary to make a acquisition time Tacq(1.12usec) plus Conversion Time Tconv(8.96) and this work well, the values changing linearity. the other thing that I know now, is to join msb and lsb with make16() command.
very very very thanks!!
_________________
Breaking rocks in the hot sun!
Doglao |
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