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OpenRTX/platform/drivers/baseband/HR_Cx000.h

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/***************************************************************************
* Copyright (C) 2021 by Federico Amedeo Izzo IU2NUO, *
* Niccolò Izzo IU2KIN *
* Frederik Saraci IU2NRO *
* Silvano Seva IU2KWO *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, see <http://www.gnu.org/licenses/> *
***************************************************************************/
#ifndef HRCx000_H
#define HRCx000_H
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* Check if "user" SPI bus, on some platforms shared between the baseband and
* other chips, is in use by the HR_Cx000 driver. This function is callable
* either from C or C++ sources.
*
* WARNING: this function is NOT thread safe! A proper critical section has to
* be set up to ensure it is accessed by one task at a time.
*
* @return true if SPI lines are being used by this driver.
*/
bool Cx000_uSpiBusy();
#ifdef __cplusplus
}
/**
* Configuration options for analog FM mode.
* Each option is tied to a particular bit of the Configuration register 0x34.
*/
enum class FmConfig : uint8_t
{
BPF_EN = 1 << 7, ///< Enable band-pass filter.
COMP_EN = 1 << 6, ///< Enable compression.
PREEMPH_EN = 1 << 5, ///< Enable preemphasis.
BW_25kHz = 1 << 4, ///< 25kHz TX bandwidth.
BW_12p5kHz = 0 ///< 12.5kHz TX bandwidth.
};
/**
* Audio input selection for both DMR and FM operation.
*/
enum class TxAudioSource
{
MIC, ///< Audio source is microphone.
LINE_IN ///< Audio source is "line in", e.g. tone generator.
};
/**
* Generic driver for HR_C5000/HR_C6000 "baseband" chip.
*
*
* WARNING: on some MDx devices the PLL and DMR chips share the SPI MOSI line,
* thus particular care has to be put to avoid them stomping reciprocally.
* This driver does not make any check if a SPI transfer is already in progress,
* deferring the correct bus management to higher level modules. However,
* a function returning true if the bus is currently in use by this driver is
* provided.
*/
class ScopedChipSelect;
template< class M >
class HR_Cx000
{
public:
/**
* \return a reference to the instance of the AT1846S class (singleton).
*/
static HR_Cx000& instance()
{
static HR_Cx000< M > Cx000;
return Cx000;
}
/**
* Destructor.
* When called it shuts down the baseband chip.
*/
~HR_Cx000()
{
terminate();
}
/**
* Initialise the baseband chip.
*/
void init();
/**
* Shutdown the baseband chip.
*/
void terminate();
/**
* Set value for two-point modulation offset adjustment. This value usually
* is stored in radio calibration data.
*
* @param offset: value for modulation offset adjustment.
*/
void setModOffset(const uint16_t offset);
/**
* Set values for two-point modulation amplitude adjustment. These values
* usually are stored in radio calibration data.
*
* @param iAmp: value for modulation offset adjustment.
* @param qAmp: value for modulation offset adjustment.
*/
inline void setModAmplitude(const uint8_t iAmp, const uint8_t qAmp)
{
writeReg(M::CONFIG, 0x45, iAmp); // Mod2 magnitude
writeReg(M::CONFIG, 0x46, qAmp); // Mod1 magnitude
}
/**
* Set value for FM-mode modulation factor, a value dependent on bandwidth.
*
* @param mf: value for FM modulation factor.
*/
inline void setModFactor(const uint8_t mf)
{
writeReg(M::CONFIG, 0x35, mf); // FM modulation factor
writeReg(M::CONFIG, 0x3F, 0x04); // FM Limiting modulation factor (HR_C6000)
}
/**
* Set the gain of the audio DAC stage. This value affects the sound volume
* in RX mode.
*
* @param value: gain value. Allowed range is 1-31.
*/
void setDacGain(uint8_t value);
/**
* Set the gain for the incoming audio from both the microphone and line-in
* sources. This value affects the modulation level in analog FM mode and
* it must be correctly tuned to avoid distorsions.
*
* HR_C5000 gain ranges from -34.5dB to +12dB
* HR_C6000 gain ranges from -12dB to +36dB
*
* @param value: gain value in dB.
*/
void setInputGain(int8_t value);
/**
* Configure chipset for DMR operation.
*/
void dmrMode();
/**
* Configure chipset for analog FM operation.
*/
void fmMode();
/**
* Start analog FM transmission.
*
* @param source: audio source for TX.
* @param cfg: TX configuration parameters, e.g. bandwidth.
*/
void startAnalogTx(const TxAudioSource source, const FmConfig cfg);
/**
* Stop analog FM transmission.
*/
void stopAnalogTx();
/**
* Set the value of a configuration register.
*
* @param reg: register number.
* @param value: new register value.
*/
inline void writeCfgRegister(const uint8_t reg, const uint8_t value)
{
writeReg(M::CONFIG, reg, value);
}
/**
* Get the current value of a configuration register.
*
* @param reg: register number.
* \return current value of the register.
*/
inline uint8_t readCfgRegister(const uint8_t reg)
{
return readReg(M::CONFIG, reg);
}
private:
/**
* Constructor.
*/
HR_Cx000()
{
// Being a singleton class, uSPI is initialised only once.
uSpi_init();
}
/**
* Helper function for register writing.
*
* @param opMode: "operating mode" specifier, see datasheet for details.
* @param addr: register number.
* @param value: value to be written.
*/
void writeReg(const M opMode, const uint8_t addr, const uint8_t value)
{
ScopedChipSelect cs;
(void) uSpi_sendRecv(static_cast< uint8_t >(opMode));
(void) uSpi_sendRecv(addr);
(void) uSpi_sendRecv(value);
}
/**
* Helper function for register reading.
*
* @param opMode: "operating mode" specifier, see datasheet for details.
* @param addr: register number.
* @return current value of the addressed register.
*/
uint8_t readReg(const M opMode, const uint8_t addr)
{
ScopedChipSelect cs;
(void) uSpi_sendRecv(static_cast< uint8_t >(opMode) | 0x80);
(void) uSpi_sendRecv(addr);
return uSpi_sendRecv(0x00);
}
/**
* Send a configuration sequence to the chipset. Configuration sequences are
* blocks of data sent contiguously.
*
* @param seq: pointer to the configuration sequence to be sent.
* @param len: length of the configuration sequence.
*/
void sendSequence(const uint8_t *seq, const size_t len)
{
ScopedChipSelect cs;
for(size_t i = 0; i < len; i++)
{
(void) uSpi_sendRecv(seq[i]);
}
}
/**
* Initialise the low-level driver which manages "user" SPI interface, that
* is the one used to configure the chipset functionalities.
*/
void uSpi_init();
/**
* Transfer one byte across the "user" SPI interface.
*
* @param value: value to be sent.
* @return incoming byte from the baseband chip.
*/
uint8_t uSpi_sendRecv(const uint8_t value);
};
/**
* \internal
* Specialisation of logical OR operator to allow composition of FmConfig fields.
* This allows to have code like: "FmConfig::BPF_EN | FmConfig::WB_MODE"
*/
FmConfig operator |(FmConfig lhs, FmConfig rhs);
/**
* \internal
* RAII class for chip select management.
*/
class ScopedChipSelect
{
public:
/**
* Constructor.
* When called it brings the HR_C5000/HR_C6000 chip select to logical low,
* selecting it.
*/
ScopedChipSelect();
/**
* Destructor.
* When called it brings the HR_C5000/HR_C6000 chip select to logical high,
* deselecting it.
*/
~ScopedChipSelect();
};
#endif // __cplusplus
#endif // HRCx000_H
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