Mislis da ja ne radim nekoliko sampla i da ne razumem o cemu pricas? Evo samo jedan detalj u vezi ads1115 pa zakljuci sam
Ali sam shvatio da nije potrebno da radim vise samplova jer onda gubim na brzini grejanja a zakljucio sam i da je ads1115 dovoljno precizan da bukvalno ni nema razlike ako je 5 samplova u pitanju ili je jedan sampl u pitanju pa sam ipak definisao READ_SAMPLES = 1
Podsetio sam se i zasto sam stavio u formuli 4.096, tako sam podesio registar u ads1115 mada sad tek vidim da je to pogresno kako sam uradio, ispravicu i doci cu do resenja na kraju.
Code:
for (i=0; i < READ_SAMPLES; ++i)
{
prev_tick = gpioTick();
// ADS1115 I2C Device Address
BSC0_A = 0x48;
// set config register and start conversion
// AIN0 and GND, 4.096v, 128sps
BSC0_DLEN = 3;
BSC0_FIFO = 1;
BSC0_FIFO = 0xc3; // single shot mode
//BSC0_FIFO = 0x42; // continuous mode
BSC0_FIFO = 0x83;
BSC0_S = CLEAR_STATUS;
BSC0_C = START_WRITE;
wait_i2c_done();
timeout = 50;
// wait for conversion complete
do {
BSC0_DLEN = 2;
BSC0_S = CLEAR_STATUS; // Reset status bits
BSC0_C = START_READ; // Start Read after clearing FIFO
wait_i2c_done();
buf[0] = BSC0_FIFO;
buf[1] = BSC0_FIFO;
} while ((0x0000 == ((buf[0] << 8 | buf[1]) & 0x8000)) && --timeout);
// read conversion register
BSC0_DLEN = 1;
BSC0_FIFO = 0; // conversion register is 0
BSC0_S = CLEAR_STATUS;
BSC0_C = START_WRITE;
wait_i2c_done();
BSC0_DLEN = 2;
BSC0_S = CLEAR_STATUS; // Reset status bits
BSC0_C = START_READ; // Start Read after clearing FIFO
wait_i2c_done();
buf[0] = BSC0_FIFO;
buf[1] = BSC0_FIFO;
// temperature = (VOUT - VREF)/(5 mV/ C)
// convert output and display results
//val = (int16_t)buf[0]*256 + (uint16_t)buf[1];
val = buf[0] << 8 | buf[1]; // Combine the two bytes of readBuf into a single 16 bit result
temperature = (float)((((val * 4.096) / 32768.0) - 1.33) / 0.005);
//printf("Conversion: buf[0]=0x%02x buf[1]=0x%02x combined=0x%04x time=%.2f mS result=%f temperature=%.2f\n",
// buf[0],
// buf[1],
// val,
// (float)((gpioTick() - prev_tick) / 1000.0),
// (float)((val * 4.096) / 32768.0),
// temperature);
jbc_temperature += round(temperature);
}
jbc_temperature /= i;
}Ali sam shvatio da nije potrebno da radim vise samplova jer onda gubim na brzini grejanja a zakljucio sam i da je ads1115 dovoljno precizan da bukvalno ni nema razlike ako je 5 samplova u pitanju ili je jedan sampl u pitanju pa sam ipak definisao READ_SAMPLES = 1
Podsetio sam se i zasto sam stavio u formuli 4.096, tako sam podesio registar u ads1115 mada sad tek vidim da je to pogresno kako sam uradio, ispravicu i doci cu do resenja na kraju.