eive-obsw/mission/devices/max1227.h
Robin Mueller 40d9829700
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Major update for power handling
and various smaller updates
2022-03-16 20:13:21 +01:00

85 lines
2.5 KiB
C++

#ifndef MISSION_DEVICES_MAX1227_H_
#define MISSION_DEVICES_MAX1227_H_
#include <cstddef>
#include <cstdint>
namespace max1227 {
enum ScanModes : uint8_t {
CHANNELS_0_TO_N = 0b00,
CHANNEL_N_TO_HIGHEST = 0b01,
N_REPEATEDLY = 0b10,
N_ONCE = 0b11
};
enum ClkSel : uint8_t {
INT_CONV_INT_TIMED_CNVST_AS_CNVST = 0b00,
INT_CONV_EXT_TIMED_CNVST = 0b01,
// Default mode upon power-up
INT_CONV_INT_TIMED_CNVST_AS_AIN = 0b10,
// Use external SPI clock for conversion and timing
EXT_CONV_EXT_TIMED = 0b11
};
enum RefSel : uint8_t {
INT_REF_WITH_WAKEUP = 0b00,
// No wakeup delay needed
EXT_REF_SINGLE_ENDED = 0b01,
INT_REF_NO_WAKEUP = 0b10,
// No wakeup delay needed
EXT_REF_DIFFERENTIAL = 0b11
};
enum DiffSel : uint8_t {
NONE_0 = 0b00,
NONE_1 = 0b01,
// One unipolar config byte follows the setup byte
UNIPOLAR_CFG = 0b10,
// One bipolar config byte follows the setup byte
BIPOLAR_CFG = 0b11
};
constexpr uint8_t buildResetByte(bool fifoOnly) { return (1 << 4) | (fifoOnly << 3); }
constexpr uint8_t buildConvByte(ScanModes scanMode, uint8_t channel, bool readTemp) {
return (1 << 7) | (channel << 3) | (scanMode << 1) | readTemp;
}
constexpr uint8_t buildSetupByte(ClkSel clkSel, RefSel refSel, DiffSel diffSel) {
return (1 << 6) | (clkSel << 4) | (refSel << 2) | diffSel;
}
/**
* If there is a wakeup delay, there needs to be a 65 us delay between sending
* the first byte (conversion byte) and the the rest of the SPI buffer.
* The raw ADC value will be located in the first and second reply byte.
* @param spiBuf
* @param n
* @param sz
*/
void prepareExternallyClockedSingleChannelRead(uint8_t* spiBuf, uint8_t channel, size_t& sz);
/**
* If there is a wakeup delay, there needs to be a 65 us delay between sending
* the first byte (first conversion byte) the the rest of the SPI buffer.
* @param spiBuf
* @param n Channel number. Example: If the ADC has 6 channels, n will be 5
* @param sz Will be incremented by amount which should be sent
*/
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 Will be incremented by amount which should be sent
*/
void prepareExternallyClockedTemperatureRead(uint8_t* spiBuf, size_t& sz);
float getTemperature(int16_t temp);
} // namespace max1227
#endif /* MISSION_DEVICES_MAX1227_H_ */