weatherstation/firmware/libraries/Adafruit_BusIO/Adafruit_SPIDevice.h
2022-11-11 11:11:25 +01:00

138 lines
5 KiB
C++

#ifndef Adafruit_SPIDevice_h
#define Adafruit_SPIDevice_h
#include <Arduino.h>
#if !defined(SPI_INTERFACES_COUNT) || \
(defined(SPI_INTERFACES_COUNT) && (SPI_INTERFACES_COUNT > 0))
// HW SPI available
#include <SPI.h>
#define BUSIO_HAS_HW_SPI
#else
// SW SPI ONLY
enum { SPI_MODE0, SPI_MODE1, SPI_MODE2, _SPI_MODE4 };
typedef uint8_t SPIClass;
#endif
// some modern SPI definitions don't have BitOrder enum
#if (defined(__AVR__) && !defined(ARDUINO_ARCH_MEGAAVR)) || \
defined(ESP8266) || defined(TEENSYDUINO) || defined(SPARK) || \
defined(ARDUINO_ARCH_SPRESENSE) || defined(MEGATINYCORE) || \
defined(DXCORE) || defined(ARDUINO_AVR_ATmega4809) || \
defined(ARDUINO_AVR_ATmega4808) || defined(ARDUINO_AVR_ATmega3209) || \
defined(ARDUINO_AVR_ATmega3208) || defined(ARDUINO_AVR_ATmega1609) || \
defined(ARDUINO_AVR_ATmega1608) || defined(ARDUINO_AVR_ATmega809) || \
defined(ARDUINO_AVR_ATmega808) || defined(ARDUINO_ARCH_ARC32)
typedef enum _BitOrder {
SPI_BITORDER_MSBFIRST = MSBFIRST,
SPI_BITORDER_LSBFIRST = LSBFIRST,
} BusIOBitOrder;
#elif defined(ESP32) || defined(__ASR6501__) || defined(__ASR6502__)
// some modern SPI definitions don't have BitOrder enum and have different SPI
// mode defines
typedef enum _BitOrder {
SPI_BITORDER_MSBFIRST = SPI_MSBFIRST,
SPI_BITORDER_LSBFIRST = SPI_LSBFIRST,
} BusIOBitOrder;
#else
// Some platforms have a BitOrder enum but its named MSBFIRST/LSBFIRST
#define SPI_BITORDER_MSBFIRST MSBFIRST
#define SPI_BITORDER_LSBFIRST LSBFIRST
typedef BitOrder BusIOBitOrder;
#endif
#if defined(__IMXRT1062__) // Teensy 4.x
// *Warning* I disabled the usage of FAST_PINIO as the set/clear operations
// used in the cpp file are not atomic and can effect multiple IO pins
// and if an interrupt happens in between the time the code reads the register
// and writes out the updated value, that changes one or more other IO pins
// on that same IO port, those change will be clobbered when the updated
// values are written back. A fast version can be implemented that uses the
// ports set and clear registers which are atomic.
// typedef volatile uint32_t BusIO_PortReg;
// typedef uint32_t BusIO_PortMask;
//#define BUSIO_USE_FAST_PINIO
#elif defined(__AVR__) || defined(TEENSYDUINO)
typedef volatile uint8_t BusIO_PortReg;
typedef uint8_t BusIO_PortMask;
#define BUSIO_USE_FAST_PINIO
#elif defined(ESP8266) || defined(ESP32) || defined(__SAM3X8E__) || \
defined(ARDUINO_ARCH_SAMD)
typedef volatile uint32_t BusIO_PortReg;
typedef uint32_t BusIO_PortMask;
#define BUSIO_USE_FAST_PINIO
#elif (defined(__arm__) || defined(ARDUINO_FEATHER52)) && \
!defined(ARDUINO_ARCH_MBED) && !defined(ARDUINO_ARCH_RP2040)
typedef volatile uint32_t BusIO_PortReg;
typedef uint32_t BusIO_PortMask;
#if !defined(__ASR6501__) && !defined(__ASR6502__)
#define BUSIO_USE_FAST_PINIO
#endif
#else
#undef BUSIO_USE_FAST_PINIO
#endif
/**! The class which defines how we will talk to this device over SPI **/
class Adafruit_SPIDevice {
public:
#ifdef BUSIO_HAS_HW_SPI
Adafruit_SPIDevice(int8_t cspin, uint32_t freq = 1000000,
BusIOBitOrder dataOrder = SPI_BITORDER_MSBFIRST,
uint8_t dataMode = SPI_MODE0, SPIClass *theSPI = &SPI);
#else
Adafruit_SPIDevice(int8_t cspin, uint32_t freq = 1000000,
BusIOBitOrder dataOrder = SPI_BITORDER_MSBFIRST,
uint8_t dataMode = SPI_MODE0, SPIClass *theSPI = nullptr);
#endif
Adafruit_SPIDevice(int8_t cspin, int8_t sck, int8_t miso, int8_t mosi,
uint32_t freq = 1000000,
BusIOBitOrder dataOrder = SPI_BITORDER_MSBFIRST,
uint8_t dataMode = SPI_MODE0);
~Adafruit_SPIDevice();
bool begin(void);
bool read(uint8_t *buffer, size_t len, uint8_t sendvalue = 0xFF);
bool write(const uint8_t *buffer, size_t len,
const uint8_t *prefix_buffer = nullptr, size_t prefix_len = 0);
bool write_then_read(const uint8_t *write_buffer, size_t write_len,
uint8_t *read_buffer, size_t read_len,
uint8_t sendvalue = 0xFF);
bool write_and_read(uint8_t *buffer, size_t len);
uint8_t transfer(uint8_t send);
void transfer(uint8_t *buffer, size_t len);
void beginTransaction(void);
void endTransaction(void);
void beginTransactionWithAssertingCS();
void endTransactionWithDeassertingCS();
private:
#ifdef BUSIO_HAS_HW_SPI
SPIClass *_spi = nullptr;
SPISettings *_spiSetting = nullptr;
#else
uint8_t *_spi = nullptr;
uint8_t *_spiSetting = nullptr;
#endif
uint32_t _freq;
BusIOBitOrder _dataOrder;
uint8_t _dataMode;
void setChipSelect(int value);
int8_t _cs, _sck, _mosi, _miso;
#ifdef BUSIO_USE_FAST_PINIO
BusIO_PortReg *mosiPort, *clkPort, *misoPort, *csPort;
BusIO_PortMask mosiPinMask, misoPinMask, clkPinMask, csPinMask;
#endif
bool _begun;
};
#endif // Adafruit_SPIDevice_h