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- /*
- * The MySensors Arduino library handles the wireless radio link and protocol
- * between your home built sensors/actuators and HA controller of choice.
- * The sensors forms a self healing radio network with optional repeaters. Each
- * repeater and gateway builds a routing tables in EEPROM which keeps track of the
- * network topology allowing messages to be routed to nodes.
- *
- * Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
- * Copyright (C) 2013-2018 Sensnology AB
- * Full contributor list: https://github.com/mysensors/MySensors/graphs/contributors
- *
- * Documentation: http://www.mysensors.org
- * Support Forum: http://forum.mysensors.org
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * version 2 as published by the Free Software Foundation.
- *
- * Based on TMRh20 RF24 library, Copyright (c) 2015 Charles-Henri Hallard <tmrh20@gmail.com>
- */
-
- #ifndef SPIBCM_h
- #define SPIBCM_h
-
- #include <stdio.h>
- #include "bcm2835.h"
- #include "BCM.h"
-
- #define SPI_HAS_TRANSACTION
-
- #define SPI_CLOCK_BASE 256000000
-
- // SPI Clock divider
- #define SPI_CLOCK_DIV1 BCM2835_SPI_CLOCK_DIVIDER_1
- #define SPI_CLOCK_DIV2 BCM2835_SPI_CLOCK_DIVIDER_2
- #define SPI_CLOCK_DIV4 BCM2835_SPI_CLOCK_DIVIDER_4
- #define SPI_CLOCK_DIV8 BCM2835_SPI_CLOCK_DIVIDER_8
- #define SPI_CLOCK_DIV16 BCM2835_SPI_CLOCK_DIVIDER_16
- #define SPI_CLOCK_DIV32 BCM2835_SPI_CLOCK_DIVIDER_32
- #define SPI_CLOCK_DIV64 BCM2835_SPI_CLOCK_DIVIDER_64
- #define SPI_CLOCK_DIV128 BCM2835_SPI_CLOCK_DIVIDER_128
- #define SPI_CLOCK_DIV256 BCM2835_SPI_CLOCK_DIVIDER_256
- #define SPI_CLOCK_DIV512 BCM2835_SPI_CLOCK_DIVIDER_512
- #define SPI_CLOCK_DIV1024 BCM2835_SPI_CLOCK_DIVIDER_1024
- #define SPI_CLOCK_DIV2048 BCM2835_SPI_CLOCK_DIVIDER_2048
- #define SPI_CLOCK_DIV4096 BCM2835_SPI_CLOCK_DIVIDER_4096
- #define SPI_CLOCK_DIV8192 BCM2835_SPI_CLOCK_DIVIDER_8192
- #define SPI_CLOCK_DIV16384 BCM2835_SPI_CLOCK_DIVIDER_16384
- #define SPI_CLOCK_DIV32768 BCM2835_SPI_CLOCK_DIVIDER_32768
- #define SPI_CLOCK_DIV65536 BCM2835_SPI_CLOCK_DIVIDER_65536
-
- // SPI Data mode
- #define SPI_MODE0 BCM2835_SPI_MODE0
- #define SPI_MODE1 BCM2835_SPI_MODE1
- #define SPI_MODE2 BCM2835_SPI_MODE2
- #define SPI_MODE3 BCM2835_SPI_MODE3
-
- #define LSBFIRST BCM2835_SPI_BIT_ORDER_LSBFIRST
- #define MSBFIRST BCM2835_SPI_BIT_ORDER_MSBFIRST
-
- const uint8_t SS = 24;
- const uint8_t MOSI = 19;
- const uint8_t MISO = 21;
- const uint8_t SCK = 23;
-
- /**
- * SPISettings class
- */
- class SPISettings
- {
-
- public:
- /**
- * @brief SPISettings constructor.
- *
- * Default clock speed is 8Mhz.
- */
- SPISettings()
- {
- init(SPI_CLOCK_DIV32, MSBFIRST, SPI_MODE0);
- }
- /**
- * @brief SPISettings constructor.
- *
- * @param clock SPI clock speed in Hz.
- * @param bitOrder SPI bit order.
- * @param dataMode SPI data mode.
- */
- SPISettings(uint32_t clock, uint8_t bitOrder, uint8_t dataMode)
- {
- uint16_t divider;
-
- if (clock >= SPI_CLOCK_BASE) {
- divider = SPI_CLOCK_DIV1;
- } else if (clock >= SPI_CLOCK_BASE / 2) {
- divider = SPI_CLOCK_DIV2;
- } else if (clock >= SPI_CLOCK_BASE / 4) {
- divider = SPI_CLOCK_DIV4;
- } else if (clock >= SPI_CLOCK_BASE / 8) {
- divider = SPI_CLOCK_DIV8;
- } else if (clock >= SPI_CLOCK_BASE / 16) {
- divider = SPI_CLOCK_DIV16;
- } else if (clock >= SPI_CLOCK_BASE / 32) {
- divider = SPI_CLOCK_DIV32;
- } else if (clock >= SPI_CLOCK_BASE / 64) {
- divider = SPI_CLOCK_DIV64;
- } else if (clock >= SPI_CLOCK_BASE / 128) {
- divider = SPI_CLOCK_DIV128;
- } else if (clock >= SPI_CLOCK_BASE / 256) {
- divider = SPI_CLOCK_DIV256;
- } else if (clock >= SPI_CLOCK_BASE / 512) {
- divider = SPI_CLOCK_DIV512;
- } else if (clock >= SPI_CLOCK_BASE / 1024) {
- divider = SPI_CLOCK_DIV1024;
- } else if (clock >= SPI_CLOCK_BASE / 2048) {
- divider = SPI_CLOCK_DIV2048;
- } else if (clock >= SPI_CLOCK_BASE / 4096) {
- divider = SPI_CLOCK_DIV4096;
- } else if (clock >= SPI_CLOCK_BASE / 8192) {
- divider = SPI_CLOCK_DIV8192;
- } else if (clock >= SPI_CLOCK_BASE / 16384) {
- divider = SPI_CLOCK_DIV16384;
- } else if (clock >= SPI_CLOCK_BASE / 32768) {
- divider = SPI_CLOCK_DIV32768;
- } else if (clock >= SPI_CLOCK_BASE / 65536) {
- divider = SPI_CLOCK_DIV65536;
- } else {
- // Default to 8Mhz
- divider = SPI_CLOCK_DIV32;
- }
-
- init(divider, bitOrder, dataMode);
- }
-
- uint16_t cdiv; //!< @brief SPI clock divider.
- uint8_t border; //!< @brief SPI bit order.
- uint8_t dmode; //!< @brief SPI data mode.
-
- private:
- /**
- * @brief Initialized class members.
- *
- * @param divider SPI clock divider.
- * @param bitOrder SPI bit order.
- * @param dataMode SPI data mode.
- */
- void init(uint16_t divider, uint8_t bitOrder, uint8_t dataMode)
- {
- cdiv = divider;
- border = bitOrder;
- dmode = dataMode;
- }
-
- friend class SPIBCMClass;
- };
-
- /**
- * SPIBCM class
- */
- class SPIBCMClass
- {
-
- public:
- /**
- * @brief Send and receive a byte.
- *
- * @param data to send.
- * @return byte received.
- */
- inline static uint8_t transfer(uint8_t data);
- /**
- * @brief Send and receive a number of bytes.
- *
- * @param tbuf Sending buffer.
- * @param rbuf Receive buffer.
- * @param len Buffer length.
- */
- inline static void transfernb(char* tbuf, char* rbuf, uint32_t len);
- /**
- * @brief Send and receive a number of bytes.
- *
- * @param buf Buffer to read from and write to.
- * @param len Buffer length.
- */
- inline static void transfern(char* buf, uint32_t len);
- /**
- * @brief Start SPI operations.
- */
- static void begin();
- /**
- * @brief End SPI operations.
- */
- static void end();
- /**
- * @brief Sets the SPI bit order.
- *
- * @param bit_order The desired bit order.
- */
- static void setBitOrder(uint8_t bit_order);
- /**
- * @brief Sets the SPI data mode.
- *
- * @param data_mode The desired data mode.
- */
- static void setDataMode(uint8_t data_mode);
- /**
- * @brief Sets the SPI clock divider and therefore the SPI clock speed.
- *
- * @param divider The desired SPI clock divider.
- */
- static void setClockDivider(uint16_t divider);
- /**
- * @brief Sets the chip select pin.
- *
- * @param csn_pin Specifies the CS pin.
- */
- static void chipSelect(int csn_pin);
- /**
- * @brief Start SPI transaction.
- *
- * @param settings for SPI.
- */
- static void beginTransaction(SPISettings settings);
- /**
- * @brief End SPI transaction.
- */
- static void endTransaction();
- /**
- * @brief Not implemented.
- *
- * @param interruptNumber ignored parameter.
- */
- static void usingInterrupt(uint8_t interruptNumber);
- /**
- * @brief Not implemented.
- *
- * @param interruptNumber ignored parameter.
- */
- static void notUsingInterrupt(uint8_t interruptNumber);
-
- private:
- static uint8_t initialized; //!< @brief SPI initialized flag.
- };
-
- uint8_t SPIBCMClass::transfer(uint8_t data)
- {
- return bcm2835_spi_transfer(data);
- }
-
- void SPIBCMClass::transfernb(char* tbuf, char* rbuf, uint32_t len)
- {
- bcm2835_spi_transfernb( tbuf, rbuf, len);
- }
-
- void SPIBCMClass::transfern(char* buf, uint32_t len)
- {
- transfernb(buf, buf, len);
- }
-
- extern SPIBCMClass SPIBCM;
-
- #endif
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