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/*
* SPI Master library for nRF5x.
* Copyright (c) 2015 Arduino LLC
* Copyright (c) 2016 Sandeep Mistry All right reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _SPI_H_INCLUDED
#define _SPI_H_INCLUDED
#include <Arduino.h>
// SPI_HAS_TRANSACTION means SPI has
// - beginTransaction()
// - endTransaction()
// - usingInterrupt()
// - SPISetting(clock, bitOrder, dataMode)
#define SPI_HAS_TRANSACTION 1
#define SPI_MODE0 0x02
#define SPI_MODE1 0x00
#define SPI_MODE2 0x03
#define SPI_MODE3 0x01
class SPISettings {
public:
SPISettings(uint32_t clock, BitOrder bitOrder, uint8_t dataMode) {
if (__builtin_constant_p(clock)) {
init_AlwaysInline(clock, bitOrder, dataMode);
} else {
init_MightInline(clock, bitOrder, dataMode);
}
}
// Default speed set to 4MHz, SPI mode set to MODE 0 and Bit order set to MSB first.
SPISettings() { init_AlwaysInline(4000000, MSBFIRST, SPI_MODE0); }
private:
void init_MightInline(uint32_t clock, BitOrder bitOrder, uint8_t dataMode) {
init_AlwaysInline(clock, bitOrder, dataMode);
}
void init_AlwaysInline(uint32_t clock, BitOrder bitOrder, uint8_t dataMode) __attribute__((__always_inline__)) {
if (clock <= 125000) {
this->clockFreq = SPI_FREQUENCY_FREQUENCY_K125;
} else if (clock <= 250000) {
this->clockFreq = SPI_FREQUENCY_FREQUENCY_K250;
} else if (clock <= 500000) {
this->clockFreq = SPI_FREQUENCY_FREQUENCY_K500;
} else if (clock <= 1000000) {
this->clockFreq = SPI_FREQUENCY_FREQUENCY_M1;
} else if (clock <= 2000000) {
this->clockFreq = SPI_FREQUENCY_FREQUENCY_M2;
} else if (clock <= 4000000) {
this->clockFreq = SPI_FREQUENCY_FREQUENCY_M4;
} else {
this->clockFreq = SPI_FREQUENCY_FREQUENCY_M8;
}
this->bitOrder = (bitOrder == MSBFIRST ? SPI_CONFIG_ORDER_MsbFirst : SPI_CONFIG_ORDER_LsbFirst);
this->dataMode = dataMode;
}
uint32_t clockFreq;
uint8_t dataMode;
uint32_t bitOrder;
friend class SPIClass;
};
class SPIClass {
public:
SPIClass(NRF_SPI_Type *p_spi, uint8_t uc_pinMISO, uint8_t uc_pinSCK, uint8_t uc_pinMOSI);
byte transfer(uint8_t data);
uint16_t transfer16(uint16_t data);
inline void transfer(void *buf, size_t count);
// Transaction Functions
void usingInterrupt(int interruptNumber);
void beginTransaction(SPISettings settings);
void endTransaction(void);
// SPI Configuration methods
void attachInterrupt();
void detachInterrupt();
void begin();
void end();
void setBitOrder(BitOrder order);
void setDataMode(uint8_t uc_mode);
void setClockDivider(uint8_t uc_div);
private:
void init();
void config(SPISettings settings);
NRF_SPI_Type *_p_spi;
uint8_t _uc_pinMiso;
uint8_t _uc_pinMosi;
uint8_t _uc_pinSCK;
uint8_t _dataMode;
uint32_t _bitOrder;
bool initialized;
uint8_t interruptMode;
char interruptSave;
uint32_t interruptMask;
};
void SPIClass::transfer(void *buf, size_t count)
{
// TODO: Optimize for faster block-transfer
uint8_t *buffer = reinterpret_cast<uint8_t *>(buf);
for (size_t i=0; i<count; i++)
buffer[i] = transfer(buffer[i]);
}
#if SPI_INTERFACES_COUNT > 0
extern SPIClass SPI;
#endif
// For compatibility with sketches designed for AVR @ 64 MHz
// New programs should use SPI.beginTransaction to set the SPI clock
#if F_CPU == 64000000 // feather52 run @ 64Mhz
#define SPI_CLOCK_DIV2 2
#define SPI_CLOCK_DIV4 4
#define SPI_CLOCK_DIV8 8
#define SPI_CLOCK_DIV16 16
#define SPI_CLOCK_DIV32 32
#define SPI_CLOCK_DIV64 64
#define SPI_CLOCK_DIV128 128
#define SPI_CLOCK_DIV256 256
#define SPI_CLOCK_DIV512 512
#endif
#endif
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