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0.1.1 added CRC checking

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RobTillaart 2017-12-12 13:21:02 +01:00
parent eb8163fc8d
commit 5fa808ee04
1 changed files with 29 additions and 19 deletions
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48
libraries/AM232X/AM232X.cpp
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@ -1,11 +1,12 @@
//
// FILE: AM232X.cpp
// AUTHOR: Rob Tillaart
// VERSION: 0.1.0
// VERSION: 0.1.1
// PURPOSE: AM232X library for AM2320 for Arduino.
//
// HISTORY:
// 0.1.0 - 2017-12-11 initial version
// 0.1.1 = 2017-12-12 added CRC
//
// Released to the public domain
//
@ -111,7 +112,7 @@ int AM232X::_readRegister(uint8_t reg, uint8_t count)
// wake up the sensor - see 8.2
Wire.beginTransmission(_deviceAddress);
int rv = Wire.endTransmission();
delayMicroseconds(1000);
delayMicroseconds(1000); // TODO tune
// request the data
Wire.beginTransmission(_deviceAddress);
@ -170,33 +171,42 @@ int AM232X::_readRegister(uint8_t reg, uint8_t count)
int AM232X::_writeRegister(uint8_t reg, uint8_t cnt, int32_t value)
{
// TODO fix
// bool debug = true;
// wake up the sensor - see 8.2
Wire.beginTransmission(_deviceAddress);
int rv = Wire.endTransmission();
delayMicroseconds(1000);
delayMicroseconds(1000); // TODO tune
// prepare data to send
bits[0] = value & 0xFF;
bits[1] = (value >> 8) & 0xFF;
bits[2] = (value >> 8) & 0xFF;
bits[3] = (value >> 8) & 0xFF;
bits[0] = 0x10;
bits[1] = reg;
bits[2] = cnt;
if (cnt == 4)
{
bits[6] = value & 0xFF;
bits[5] = (value >> 8) & 0xFF;
bits[4] = (value >> 8) & 0xFF;
bits[3] = (value >> 8) & 0xFF;
}
else if (cnt == 2)
{
bits[4] = value & 0xFF;
bits[3] = (value >> 8) & 0xFF;
}
else if (cnt == 1)
{
bits[3] = value & 0xFF;
}
uint16_t crc = crc16(bits, cnt + 3);
// send data
Wire.beginTransmission(_deviceAddress);
Wire.write(0x10);
Wire.write(reg);
Wire.write(cnt);
switch(cnt)
for (int i=0; i< cnt+3; i++)
{
case 4: Wire.write(bits[3]);
case 3: Wire.write(bits[2]);
case 2: Wire.write(bits[1]);
case 1: Wire.write(bits[0]);
Wire.write(bits[i]);
}
// add CRC ?
Wire.write(crc & 0xFF);
Wire.write(crc >> 8);
rv = Wire.endTransmission();
if (rv < 0) return rv;