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added new max1227 helper functions

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This commit is contained in:
Robin Müller 2022-02-17 20:42:53 +01:00
parent ae4d1e6db3
commit 49decb8e9a
2 changed files with 20 additions and 0 deletions
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10
mission/devices/max1227.cpp
View File

@ -1,5 +1,7 @@
#include "max1227.h"
#include <cstring>
uint8_t max1227::buildConvByte(ScanModes scanMode, uint8_t channel, bool readTemp) {
return (1 << 7) | (channel << 3) | (scanMode << 1) | readTemp;
}
@ -26,3 +28,11 @@ void max1227::prepareExternallyClockedRead0ToN(uint8_t *spiBuf, uint8_t n, size_
spiBuf[(n + 1) * 2] = 0x00;
sz = (n + 1) * 2 + 1;
}
void max1227::prepareExternallyClockedTemperatureRead(uint8_t *spiBuf, size_t &sz) {
spiBuf[0] = buildConvByte(ScanModes::N_ONCE, 0, true);
std::memset(spiBuf + 1, 0, 24);
sz = 25;
}
float max1227::getTemperature(int16_t temp) { return static_cast<float>(temp) * 0.125; }

10
mission/devices/max1227.h
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@ -63,6 +63,16 @@ void prepareExternallyClockedSingleChannelRead(uint8_t* spiBuf, uint8_t channel,
*/
void prepareExternallyClockedRead0ToN(uint8_t* spiBuf, uint8_t n, size_t& sz);
/**
* Prepare an externally clocked temperature read. 25 bytes have to be sent
* and the raw temperature value will appear on the last 2 bytes of the reply.
* @param spiBuf
* @param sz
*/
void prepareExternallyClockedTemperatureRead(uint8_t* spiBuf, size_t& sz);
float getTemperature(int16_t temp);
} // namespace max1227
#endif /* MISSION_DEVICES_MAX1227_H_ */