CANBUS Background | Lantronix DSTni-EX guide

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Lantronix DSTni-EX manual CANBUS Background, Data Exchanges and Communication, Arbitration and Error Checking

Contents

DSTni-EX User Guide Section FivePage Copyright & Trademark LantronixTechnical Support Master Distributor Warranty Contents 1 About This User Guide2 SPI Controller 3 I2C Controller List of Tables 5 CAN Controllers Table 3-17. Clock Control Register List of Figures 1 About This User Guide Intended Audience ConventionsNavigating Online Notes Notes are information requiring attention Organization 2 SPI Controller Theory of OperationSPI Background DSTni SPI Controller SPI Controller Register Summary Table 2-1. SPI Controller Register Summary SPI Controller Register Definitions SPIDATA RegisterRESET Table 2-2. SPIDATA Register CTL Register Interrupt Request EnablePhase Select Wire-O SPISTAT Register Table 2-6. SPISTAT RegisterTable 2-7. SPISTAT Register Definitions Interrupt Request SPISSEL Register Table 2-10. BCNT Bit SettingsSelectO Signal Table 2-8. SPISSEL Register DVDCNTRLO Register DVDCNTRHITable 2-11. DVDCNTRLO Register Table 2-12. DVDCNTRLO Register Definitions Features 3 I2C Controller I2C Background Block DiagramFigure 3-1. DSTni I2C Controller Block Diagram Operating Modes I2C ControllerMaster Transmit Mode Table 3-1. Master Transmit Status Codes CodeI2C State Microprocessor Response Servicing the Interrupt Table 3-2. Codes After Servicing Interrupts Master Transmit Transmitting Each Data Byte Table 3-3. Status Codes After Each Data Byte TransmitsAll Bytes Transmit Completely Master Receive Mode Table 3-4. Master Receive Status Codes Table 3-5. Codes After Servicing Interrupt Master Receive Table 3-6. Codes After Receiving Each Data Byte Receiving Each Data ByteSlave Transmit Mode Slave Receive Mode Bus Clock Considerations Bus Clock SpeedClock Synchronization Bus Arbitration Programmer’s Reference I2C Controller Register SummaryResetting the I2C Controller Table 3-7. I 2C Controller Register Summary I2C Controller Register Definitions Slave Address RegisterGeneral Call Address Enable Table 3-8. Slave Address Register Data Register Table 3-10. Data Register Control Register Table 3-12. Control RegisterTable 3-13. Control Register Definitions Extended Slave Address Status Register Table 3-14. Status Register Table 3-16. Status Codes Table 3-15. Status Register DefinitionsStatus Code Table 3-17. Clock Control Register Clock Control RegisterTable 3-18. Clock Control Register Definitions Software Reset Register Extended Slave Address RegisterTable 3-21. Software Reset Register Table 3-22. Software Reset Register Definitions 4 USB Controller USB Background USB InterruptUSB Core Serial Interface Engine USB Hardware/Software Interface Digital Phase Lock Loop LogicMicroprocessor Interface Buffer Descriptor Table Figure 4-1. Buffer Descriptor Table Rx vs. Tx as a Target Device or Host Table 4-1. USB Data Direction Addressing BDT EntriesTable 4-2. 16-Bit USB Address Table 4-3. 16-Bit USB Address Definitions Table 4-4. BDT Data Used by USB Controller and Microprocessor USB Controller Determines…Microprocessor Determines… Table 4-5. USB Buffer Descriptor Format Table 4-6. USB Buffer Descriptor Format Definitions BD OwnerDATA0/1 Transmit or Receive USB Ownership USB Transaction Figure 4-2. USB Token Transaction Table 4-7. USB Register Summary USB Register SummaryDedicated to host mode USB Register Definitions Interrupt Status RegisterTable 4-8. Interrupt Status Register Table 4-9. 16- Interrupt Status Register Definitions Enable/Disable USBRST Interrupt Sleep TimerError Condition USB Reset Table 4-10. Error Interrupt Status Register Error RegisterTable 4-11. 16- Error Interrupt Status Register Definitions Error interrupt with two functions Data Field Received Not 8 BitsCRC16 Failure PID check field failed Live USB Differential Receiver JSTATE Signal Live USB Single Ended Zero SignalTable 4-12. Status Register Table 4-13. Status Register Definitions USB Reset Signal Host Mode Enable valid for host mode onlyResume Signaling BDT PDD Reset Table 4-14. Address Register Address RegisterTable 4-15. 16- Address Register Definitions Frame Number Registers Table 4-16. Frame Number RegisterTable 4-17. Frame Number Register Definitions Frame Number Token Register Endpoint for Token Command Table 4-18. Token RegisterTable 4-19. Token Register Definitions Table 4-20. Valid PID Tokens Endpoint Control Registers Endpoint EnableTable 4-21. Endpoint Control Registers Table 4-22. Endpoint Control Register Definitions Host Mode Operation Table 4-23. Endpoint Control Register Definitions Sample Host Mode Operations Figure 3. Enable Host Mode and Configure a Target Device Figure 4. Full-Speed Bulk Data Transfers to a Target Device USB Pull-up/Pull-down Resistors Figure 4-5. Pull-up/Pull-down USB USB Interface Signals USB Output EnableHOST Mode Enable Clock CLK 5 CAN Controllers CANBUS Background Arbitration and Error CheckingData Exchanges and Communication CANBUS Speed and Length Table 5-1. Bit Rates for Different Cable Lengths CAN Register Summaries Register SummaryHex Offset Register Hex Offset Detailed CAN Register Map Table 5-4. Detailed CAN Register Map Acceptance Filter Enable Register Hex Offset Register CAN Register Definitions TX Message RegistersFigure 5-1. TX Message Routing Sending a Message Tx Message Registers Table 5-5. TxMessage0ID28Table 5-6. TxMessage0ID12 Table 5-7. TxMessage0Data Table 5-12. TxMessage0Ctrl Flags Table 5-13. TxMessage0 Register DefinitionsMessage Identifier for Both Standard and Extended Messages Message Data RX Message Registers Figure 5-2. RX Message Routing Rx Message Registers Table 5-14. RxMessageID28Table 5-15. Rx Message ID28 Register Definitions Table 5-16. RxMessageID12 Table 5-20. Rx Message Data Table 5-21. Rx Message Data 39 Register DefinitionsTable 5-22. Rx Message Data Table 5-23. Rx Message Data 23 Register Definitions Table 5-26. RxMessage RTR Table 5-27. Rx Message RTR Register DefinitionsTable 5-28. Rx Message Msg Flags Table 5-29. Rx Message Msg Flags Register Definitions Error Count and Status Registers Table 5-30. Tx/Rx Error CountTable 5-31. Tx\Rx Error Count Register Definitions Table 5-32. Error Status Table 5-34. Tx/Rx Message Level Register Table 5-35. Tx/Rx Message Level Register Definitionsrxlevel10 txlevel10 Interrupt Flags Note The reset value of this register’s bits is indeterminateCRC Error Format Error Interrupt Enable Registers Table 5-38. Interrupt Enable RegistersTable 5-39. Interrupt Enable Register Definitions Bus Off State − int2n group error interrupts CAN Operating Mode Table 5-40. Interrupt Enable RegistersTable 5-41. Interrupt Enable Register Definitions Overload Condition − int3n group diagnostic interrupts CAN Configuration Registers Configuration Bit RateFigure 5-3. CAN Operating Mode Table 5-42. Bit Rate Divisor Register Table 5-44. Configuration Register Table 5-45. Configuration Register DefinitionsOverwrite Last Message Cfgsjw Bit Time tseg1 +tseg2 + time quanta TQ Acceptance Filter and Acceptance Code Mask Table 5-46. Acceptance Filter Enable RegisterTable 5-47. Acceptance Filter Enable Register Definitions Table 5-48. Acceptance Mask 0 Register Table 5-50. Acceptance Mask Register ID Table 5-51. Acceptance Mask Register ID12 DefinitionsTable 5-52. Acceptance Mask Register Data D5556 Table 5-54. Acceptance Code Register Table 5-55. Acceptance Code Register DefinitionsTable 5-56. Acceptance Mask Register ID12 Table 5-57. Acceptance Mask Register ID12 Definitions CANbus Analysis Arbitration Lost Capture RegisterTable 5-60. Arbitration Lost Capture Register Table 5-61. Arbitration Lost Capture Register Definitions Error Capture Register Table 5-62. Error Capture RegisterTable 5-63. Error Capture Register Definitions Errorcode Table 5-65. Error Capture Register Definitions Frame Reference RegisterTable 5-64. Frame Reference Register Stuff Bit Inserted CAN Bus Interface Interface ConnectionsFigure 5-6. CAN Connector Figure 5-5. CAN Bus Interface Figure 5-7. Power for CAN +5CANGNDCAN +24V Figure 5-8. CAN Transceiver and Isolation Circuits 0.01uf