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gabriel09
Joined: 29 Nov 2020
Posts: 1
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| Problems with TMP102 and PIC18F46K22 |
 Posted: Sun Nov 29, 2020 8:02 pm |
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Here is my code:
| Code: |
#include <18f46K22.h>
#device PASS_STRINGS = IN_RAM
#define BME280_I2C_ADDRESS 0xEC
//#fuses XT,NOWDT,NOPROTECT,PUT,NOLVP,BROWNOUT
#fuses XT,NOWDT,NOPROTECT,PUT,NOLVP,NOBROWNOUT
#use i2c(Master, sda=PIN_D1, scl=PIN_D0)
#use delay(clock = 20MHz,crystal = 20MHz)
#use rs232(baud=9600,bits=8,parity=N,xmit=PIN_C6,rcv=PIn_C7) //SERIAL de GPS
//#use RS232(UART1, BAUD = 9600, ERRORS) //UART1
//#use i2c(MASTER, sda=pin_D1,scl=pin_D0, FAST = 400000, STREAM = TMP117_STREAM, FORCE_HW, SMBUS ) //BME280
//#use I2C(MASTER, sda=pin_B0,scl=pin_B1, FAST = 400000, STREAM = INA_STREAM, )
//#include <BME280_Lib.c> // include BME280 sensor driver source file
//#include <GPS_Lib.c> //Libreria GPS
#include <stdio.h>
#include <string.h>
#include<math.h>
//#define TMP_RD 0x91
//#define TMP_WR 0x90//Assume ADR0 is tied to VCC
//#define TEMP_REG 0x00
signed int32 temperature;
unsigned int32 pressure, humidity;
//Varaibles del sensor de corriente
int data1,data2;
int16 VSina = 0;
unsigned int16 VSinau;
float valuecurrent;
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 dac(unsigned int16 sample){
// i2c_start(TMP117_STREAM);
//i2c_write(TMP117_STREAM,0B11000000); // I2C slave address 0x40
// i2c_write(TMP117_STREAM,0B1000000); // INA219 config reg
// i2c_write(TMP117_STREAM,((sample & 0xFF0) >> 4)); // bus 16V, shunt 320mV, 12-bit continuous Vshunt Vbus
// i2c_write(TMP117_STREAM,((sample & 0xF) << 4));
// i2c_write(INA_STREAM,0x9F); //
// i2c_stop(TMP117_STREAM);
// }
void main(){
unsigned int8 msb, lsb ;
int re, re2, re3;
delay_ms(2000);
printf("TMP102 Example \r\n");
printf("Reading Started...\r\n");
delay_ms(500);
while(TRUE)
{
unsigned int8 i;
unsigned int8 status;
unsigned int8 count = 0;
printf("\n\rStart:\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\n\r", i);
count++;
delay_ms(2000);
}
}
if(count == 0)
printf("\n\rNothing Found");
else
printf("\n\rNumber of i2c chips found: %u", count);
i2c_start();
delay_ms(50);
re=i2c_write(i); //We want to write a value to the TMP
delay_ms(50);
re2=i2c_write(0X00); //Set pointer register to temperature register (it's already there by default, but you never know)
i2c_start();
delay_ms(50);
re3=i2c_write(i+1); // Read from this I2C address, R/*W Set
delay_ms(50);
msb= i2c_read(); //Read the MSB data
delay_ms(50);
lsb = i2c_read(0); //Read the LSB data
i2c_Stop();
printf(" %u ", msb); //
printf(" %u ", lsb); //
printf(" re:%d re2:%d \n", re, re2);
delay_ms(3000);
}
} |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19505
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| Posted: Mon Nov 30, 2020 4:16 am |
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Comments inline
| Code: |
//#fuses XT,NOWDT,NOPROTECT,PUT,NOLVP,BROWNOUT
#fuses XT,NOWDT,NOPROTECT,PUT,NOLVP,NOBROWNOUT
//This is wrong. XT is for a crystal <=4MHz. You should be selecting HS
#use delay(clock = 20MHz,crystal = 20MHz)
//This though overrides the previous error.
#use i2c(Master, sda=PIN_D1, scl=PIN_D0)
//Put this _after_ the clock setup. Otherwise timings may not be right
#use rs232(baud=9600,bits=8,parity=N,xmit=PIN_C6,rcv=PIn_C7)
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You then need to get rid of your delay_ms(50) lines. The chip has a
built in timeout, if a transaction does not complete in 30mSec . These
delays will prevent the I2C from working properly. Once a 'start' has been
sent, the I2C should be continuous, without delays.
On a standard I2C device, there is no 'timeout', but SMBUS devices
have a timeout. This is an SMBUS device. |
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temtronic
Joined: 01 Jul 2010
Posts: 9225
Location: Greensville,Ontario
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| Posted: Mon Nov 30, 2020 5:35 am |
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re: the hardware...just downloaded the TMP102...The datasheet says it's a '3 volt ' device, so be SURE to run the PIC at 3 volts !!
Also, add 'ERRORS' to the #Use RS232(...options...). It'll prevent overrun errors (UART freezing).
Jay |
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