PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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 Posted: Thu Apr 22, 2010 12:51 pm |
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Run this program and see if finds the ADS1112 chip. This program will
report any i2c chips that are on the bus, if they're alive (within the slave
address range of 0x10 to 0xEF). If it doesn't find it make sure that pins
A0 and A1 are connected to ground on the ADS1112.
Also, make sure you have pull-up resistors on the SDA and SCL lines.
You can use 4.7K ohm resistors.
| Code: |
#include <16F877.h>
#fuses XT,NOWDT,NOPROTECT,PUT,NOLVP,NOBROWNOUT
#use delay(clock=4000000)
#use i2c(Master, sda=PIN_C4, scl=PIN_C3)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
// This function writes the slave address to the i2c bus.
// If a slave chip is at that address, it should respond to
// this with an "ACK". This function returns TRUE if an
// ACK was found. Otherwise it returns FALSE.
int8 get_ack_status(int8 address)
{
int8 status;
i2c_start();
status = i2c_write(address); // Status = 0 if got an ACK
i2c_stop();
if(status == 0)
return(TRUE);
else
return(FALSE);
}
//=================================
void main()
{
int8 i;
int8 status;
int8 count = 0;
printf("Start:\n\r");
delay_ms(1000);
// Try all slave addresses from 0x10 to 0xEF.
// See if we get a response from any slaves
// that may be on the i2c bus.
for(i=0x10; i < 0xF0; i+=2)
{
status = get_ack_status(i);
if(status == TRUE)
{
printf("ACK addr: %X", i);
count++;
delay_ms(2000);
}
}
if(count == 0)
printf("\n\rNothing Found");
else
printf("\n\rFound %u chips", count);
while(1);
} |
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