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Tuning LM75AD sensor driver

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This commit is contained in:
Theo Arends 2018-06-05 16:55:35 +02:00
parent 43dd708413
commit 221c420fcb
1 changed files with 8 additions and 17 deletions
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25
sonoff/xsns_26_lm75ad.ino
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@ -46,18 +46,12 @@ uint8_t lm75ad_type = 0;
uint8_t lm75ad_address; uint8_t lm75ad_address;
uint8_t lm75ad_addresses[] = { LM75AD_ADDRESS1, LM75AD_ADDRESS2, LM75AD_ADDRESS3, LM75AD_ADDRESS4, LM75AD_ADDRESS5, LM75AD_ADDRESS6, LM75AD_ADDRESS7, LM75AD_ADDRESS8 }; uint8_t lm75ad_addresses[] = { LM75AD_ADDRESS1, LM75AD_ADDRESS2, LM75AD_ADDRESS3, LM75AD_ADDRESS4, LM75AD_ADDRESS5, LM75AD_ADDRESS6, LM75AD_ADDRESS7, LM75AD_ADDRESS8 };
int16_t LM75ADGetTempRegister(void)
{
uint16_t res = I2cRead16(lm75ad_address, LM75_TEMP_REGISTER);
return (int16_t)res;
}
void LM75ADDetect() void LM75ADDetect()
{ {
uint8_t buffer; uint8_t buffer;
if (lm75ad_type) {
return; if (lm75ad_type) { return; }
}
for (byte i = 0; i < sizeof(lm75ad_addresses); i++) { for (byte i = 0; i < sizeof(lm75ad_addresses); i++) {
lm75ad_address = lm75ad_addresses[i]; lm75ad_address = lm75ad_addresses[i];
if (I2cValidRead8(&buffer, lm75ad_address, LM75_CONF_REGISTER)) { if (I2cValidRead8(&buffer, lm75ad_address, LM75_CONF_REGISTER)) {
@ -69,18 +63,16 @@ void LM75ADDetect()
} }
} }
float LM75ADConvertTemp(uint16_t t) { float LM75ADGetTemp() {
float tmpt;
int16_t sign = 1; int16_t sign = 1;
uint16_t t = I2cRead16(lm75ad_address, LM75_TEMP_REGISTER);
if (t & 0x8000) { // we are getting a negative temperature value if (t & 0x8000) { // we are getting a negative temperature value
t = (~t) +0x20; t = (~t) +0x20;
sign = -1; sign = -1;
} }
t = t >> 5; // shift value into place (5 LSB not used) t = t >> 5; // shift value into place (5 LSB not used)
tmpt = ConvertTemp(sign * t * 0.125); return ConvertTemp(sign * t * 0.125);
return tmpt;
} }
void LM75ADShow(boolean json) void LM75ADShow(boolean json)
@ -88,8 +80,7 @@ void LM75ADShow(boolean json)
if (lm75ad_type) { if (lm75ad_type) {
char temperature[10]; char temperature[10];
uint16_t lm75ad_value = LM75ADGetTempRegister(); float t = LM75ADGetTemp();
float t = LM75ADConvertTemp(lm75ad_value);
dtostrfd(t, Settings.flag2.temperature_resolution, temperature); dtostrfd(t, Settings.flag2.temperature_resolution, temperature);
if (json) { if (json) {