Implementation of 1-Wire with added Alarm Search Functionality
Dependents: Max32630_One_Wire_Interface
Masters/DS2465/DS2465.h
- Committer:
- IanBenzMaxim
- Date:
- 2016-05-12
- Revision:
- 73:2cecc1372acc
- Parent:
- OneWire_Masters/DS2465/DS2465.hpp@ 72:6892702709ee
- Child:
- 74:23be10c32fa3
File content as of revision 73:2cecc1372acc:
#ifndef OneWire_Masters_DS2465 #define OneWire_Masters_DS2465 #include "Masters/OneWireMaster.h" #include "Authenticators/ISha256MacCoproc.h" namespace mbed { class I2C; } namespace OneWire { namespace Masters { /// Interface to the DS2465 1-Wire master and SHA-256 coprocessor. class DS2465 : public OneWireMaster, public Authenticators::ISha256MacCoproc { public: /// Delay required after writing an EEPROM segment. static const unsigned int eepromSegmentWriteDelayMs = 10; /// Delay required after writing an EEPROM page such as the secret memory. static const unsigned int eepromPageWriteDelayMs = 8 * eepromSegmentWriteDelayMs; /// Delay required for a SHA computation to complete. static const unsigned int shaComputationDelayMs = 2; /// Page region to use for swapping. enum PageRegion { REGION_FULL_PAGE = 0x03, REGION_FIRST_HALF = 0x01, REGION_SECOND_HALF = 0x02 }; /// Starting memory addresses. enum MemoryAddr { ADDR_SPAD = 0x00, ADDR_CMD_REG = 0x60, ADDR_STATUS_REG = 0x61, ADDR_DATA_REG = 0x62, ADDR_MAC_READ = 0x63, ADDR_SHA_SELECT_REG = 0x66, ADDR_WCFG_REG = 0x67, ADDR_TRSTL_REG = 0x68, ADDR_TMSP_REG = 0x69, ADDR_TW0L_REG = 0x6A, ADDR_TREC0_REG = 0x6B, ADDR_RWPU_REG = 0x6C, ADDR_TW1L_REG = 0x6D, ADDR_USER_MEM_PAGE_0 = 0x80, ADDR_USER_MEM_PAGE_1 = 0xA0 }; /// Represents a DS2465 configuration. class Config { public: /// @{ /// 1-Wire Speed bool get1WS() const { return m_1WS; } void set1WS(bool new1WS) { m_1WS = new1WS; } /// @} /// @{ /// Strong Pullup bool getSPU() const { return m_SPU; } void setSPU(bool newSPU) { m_SPU = newSPU; } /// @} /// @{ /// 1-Wire Power Down bool getPDN() const { return m_PDN; } void setPDN(bool newPDN) { m_PDN = newPDN; } /// @} /// @{ /// Active Pullup bool getAPU() const { return m_APU; } void setAPU(bool newAPU) { m_APU = newAPU; } /// @} /// Byte representation that is read from the DS2465. uint8_t readByte() const; /// Byte respresentation that is written to the DS2465. uint8_t writeByte() const; /// Reset to the power-on default config. void reset(); Config() { reset(); } private: bool m_1WS, m_SPU, m_PDN, m_APU; }; /// @param I2C_interface Configured I2C communication interface for DS2465. /// @param I2C_address I2C bus address of the DS2465 in mbed format. DS2465(mbed::I2C & I2C_interface, uint8_t I2C_address); // Const member functions should not change the settings of the DS2465 or affect the state of the 1-Wire bus. // Read pointer, scratchpad, MAC output register, and command register on the DS2465 are considered mutable. /// Performs a soft reset on the DS2465. This is NOT a 1-Wire Reset. OneWireMaster::CmdResult reset(void); /// Write a new configuration to the DS2465. /// @param[in] config New configuration to write. /// @param verify Verify that the configuration was written successfully. OneWireMaster::CmdResult writeConfig(const Config & config, bool verify); /// Read the current DS2465 configuration. /// @returns The cached current configuration. Config currentConfig() const { return m_curConfig; } // DS2465 Memory Commands /// Read memory from the DS2465 /// @param addr Address to begin reading from. /// @param[out] buf Buffer to hold read data. /// @param bufLen Length of buffer, buf, and number of bytes to read. /// @param skipSetPointer Assume that the read pointer is already set to the correct address. OneWireMaster::CmdResult readMemory(uint8_t addr, uint8_t * buf, size_t bufLen, bool skipSetPointer = false) const; /// Write to SRAM memory on the DS2465 /// @param addr Address to begin writing to. /// @param[in] buf Buffer containing the data to write. /// @param bufLen Length of buffer, buf, and number of bytes to write. OneWireMaster::CmdResult writeMemory(uint8_t addr, const uint8_t * buf, size_t bufLen) { return cWriteMemory(addr, buf, bufLen); } /// Write data to the scratchpad area of the DS2465 /// @param[in] buf Buffer containing the data to write. /// @param bufLen Length of buffer, buf, and the number of bytes to write. OneWireMaster::CmdResult writeScratchpad(const uint8_t * buf, size_t bufLen) const { return cWriteMemory(ADDR_SPAD, buf, bufLen); } /// Copy the scratchpad contents to an EEPROM memory page. /// @param pageNum Page number to copy to. OneWireMaster::CmdResult copyScratchpadToPage(unsigned int pageNum) { return copyScratchpad(false, pageNum, false, 0); } /// Copy the scratchpad contents to an EEPROM memory segment. /// @param pageNum Page number to copy to. /// @param segmentNum Segment number to copy to. OneWireMaster::CmdResult copyScratchpadToSegment(unsigned int pageNum, unsigned int segmentNum) { return copyScratchpad(false, pageNum, true, segmentNum); } /// Copy the scratchpad contents to the secret EEPROM memory page. OneWireMaster::CmdResult copyScratchpadToSecret() { return copyScratchpad(true, 0, false, 0); } // 1-Wire Master Commands virtual OneWireMaster::CmdResult OWInitMaster(void); virtual OneWireMaster::CmdResult OWReset(void); virtual OneWireMaster::CmdResult OWTouchBitSetLevel(uint8_t & sendrecvbit, OWLevel after_level); virtual OneWireMaster::CmdResult OWReadByteSetLevel(uint8_t & recvbyte, OWLevel after_level); virtual OneWireMaster::CmdResult OWWriteByteSetLevel(uint8_t sendbyte, OWLevel after_level); virtual OneWireMaster::CmdResult OWReadBlock(uint8_t *rx_buf, uint8_t rx_len); virtual OneWireMaster::CmdResult OWWriteBlock(const uint8_t *tran_buf, uint8_t tran_len); virtual OneWireMaster::CmdResult OWSetSpeed(OWSpeed new_speed); /// @note The DS2465 only supports enabling strong pullup following a 1-Wire read or write operation. virtual OneWireMaster::CmdResult OWSetLevel(OWLevel new_level); virtual OneWireMaster::CmdResult OWTriplet(SearchDirection & search_direction, uint8_t & sbr, uint8_t & tsb); /// Write the last computed MAC to the 1-Wire bus OneWireMaster::CmdResult OWWriteBlockMac(); // DS2465 Coprocessor Commands /// Compute Next Master Secret with scratchpad data. OneWireMaster::CmdResult computeNextMasterSecret() { return computeNextMasterSecret(false, 0, REGION_FULL_PAGE); } /// Compute Next Master Secret with page swapping. /// @param pageNum Page number to swap in. /// @param region Region of the page to swap in. OneWireMaster::CmdResult computeNextMasterSecretSwap(unsigned int pageNum, PageRegion region) { return computeNextMasterSecret(true, pageNum, region); } /// Compute Write MAC with scratchpad data. /// @param regwrite True if writing to a register or false if regular memory. OneWireMaster::CmdResult computeWriteMac(bool regwrite) const { return computeWriteMac(regwrite, false, 0, 0); } /// Compute Write MAC with page swapping. /// @param regwrite True if writing to a register or false if regular memory. /// @param pageNum Page number to swap in. /// @param segmentNum Segment number to swap in. OneWireMaster::CmdResult computeWriteMacSwap(bool regwrite, unsigned int pageNum, unsigned int segmentNum) const { return computeWriteMac(regwrite, true, pageNum, segmentNum); } /// Compute Slave Secret (S-Secret) with scratchpad data. OneWireMaster::CmdResult computeSlaveSecret() { return computeSlaveSecret(false, 0, REGION_FULL_PAGE); } /// Compute Slave Secret (S-Secret) with page swapping. /// @param pageNum Page number to swap in. /// @param region Region of the page to swap in. OneWireMaster::CmdResult computeSlaveSecretSwap(unsigned int pageNum, PageRegion region) { return computeSlaveSecret(true, pageNum, region); } /// Compute Authentication MAC with scratchpad data. OneWireMaster::CmdResult computeAuthMac() const { return computeAuthMac(false, 0, REGION_FULL_PAGE); } /// Compute Authentication MAC with page swapping. /// @param pageNum Page number to swap in. /// @param region Region of the page to swap in. OneWireMaster::CmdResult computeAuthMacSwap(unsigned int pageNum, PageRegion region) const { return computeAuthMac(true, pageNum, region); } // ISha256MacCoproc Commands virtual ISha256MacCoproc::CmdResult setMasterSecret(const Secret & masterSecret); virtual ISha256MacCoproc::CmdResult computeSlaveSecret(const DevicePage & devicePage, const DeviceScratchpad & deviceScratchpad, const SlaveSecretData & slaveSecretData); virtual ISha256MacCoproc::CmdResult computeWriteMac(const WriteMacData & writeMacData, Mac & mac) const; virtual ISha256MacCoproc::CmdResult computeAuthMac(const DevicePage & devicePage, const DeviceScratchpad & challenge, const AuthMacData & authMacData, Mac & mac) const; private: mbed::I2C & m_I2C_interface; uint8_t m_I2C_address; Config m_curConfig; /// Polls the DS2465 status waiting for the 1-Wire Busy bit (1WB) to be cleared. /// @param[out] pStatus Optionally retrive the status byte when 1WB cleared. /// @returns Success or TimeoutError if poll limit reached. OneWireMaster::CmdResult pollBusy(uint8_t * pStatus = NULL); /// Ensure that the desired 1-Wire level is set in the configuration. /// @param level Desired 1-Wire level. OneWireMaster::CmdResult configureLevel(OWLevel level); /// Const version of writeMemory() for internal use. OneWireMaster::CmdResult cWriteMemory(uint8_t addr, const uint8_t * buf, size_t bufLen) const; // Legacy implementations OneWireMaster::CmdResult OWWriteBlock(bool tx_mac, const uint8_t *tran_buf, uint8_t tran_len); OneWireMaster::CmdResult copyScratchpad(bool destSecret, unsigned int pageNum, bool notFull, unsigned int segmentNum); OneWireMaster::CmdResult computeNextMasterSecret(bool swap, unsigned int pageNum, PageRegion region); OneWireMaster::CmdResult computeWriteMac(bool regwrite, bool swap, unsigned int pageNum, unsigned int segmentNum) const; OneWireMaster::CmdResult computeSlaveSecret(bool swap, unsigned int pageNum, PageRegion region); OneWireMaster::CmdResult computeAuthMac(bool swap, unsigned int pageNum, PageRegion region) const; }; } } #endif