Digi BL1800 user manual Jackrabbit Function Calls, 1 I/O Drivers

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4.4 Jackrabbit Function Calls

4.4.1 I/O Drivers

The Jackrabbit contains four high-power digital output channels, two D/A converter out- put channels, and one A/D converter input channel. These I/O channels can be accessed using the functions found in the JRIO.LIB library.

4.4.1.1 Initialization

The function jrioInit() must be called before any other function from the JRIO.LIB library. This function initializes the digital outputs and sets up the driver for the analog input/outputs. The digital outputs correspond to the Rabbit processor’s port E bits 0–3, and the analog I/O uses timer B; bits 1, 2, and 4 of port D; and bits 6 and 7 of port E.

The function void jrioInit() initializes the I/O drivers for Jackrabbit. In particular, it sets up parallel port D bits 1, 2, and 4 for analog output, port E bits 0–3 for digital output, and starts up the pulse-width modulation routines for the A/D and D/A channels. Note that these routines can consume up to 20% of the CPU’s processing power; the routines use timer B and the B1 and B2 match registers.

4.4.1.2 Digital Outputs

The Jackrabbit contains four high-power digital output drivers, HV0–HV3, on header J4. These can be turned on and off with the following functions from the library JRIO.LIB.

HV0, HV1, and HV2 are open-collector sinking outputs, and are able to sink up to 1 A (200 mA for the Jackrabbit and BL1820) from a 30 V source connected to the K line on header J4. HV3 is a sourcing output that is able to source up to 500 mA (100 mA for the BL1810 and BL1820) from a 30 V source connected to the K line.

CAUTION: Remember to cut the trace between K and Vcc inside the outline for header JP2 on the top side of the Prototyping Board if you are supplying K from a separate power supply. An exacto knife, a precision grinder tool, or a screwdriver may be used to cut through the traces as shown in Figure 16.

NOTE: Failure to do this could lead to

the destruction of the Rabbit 2000 microprocessor and other components once the Jackrabbit is connected to the Prototyping Board.

Cut gray trace as shown

Top Side

Prototyping

Board

JP2

 

 

 

 

 

 

 

 

VCC

K

 

 

 

 

 

 

Cut

 

 

LS1

 

 

 

R3

 

 

Buzzer

 

3

 

 

 

2

 

 

 

 

 

 

 

COIL()-

R1

 

 

 

+

 

 

 

 

1

 

 

 

HV0

+RAWPOT PE4

GND AD0

 

JP2

 

 

 

RT1

 

BZR VCC

K

AD0

PD0

 

 

Figure 16. Cut Trace on Prototyping Board

When Vcc and K Are Different

User’s Manual

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Contents Programmable Single-Board Computer Jackrabbit BL1800Digi International Inc TrademarksTable of Contents Index Schematics Introduction FeaturesDevelopment and Evaluation Tools Jackrabbit FeaturesAdditional Product Information How to Use This ManualOnline Documentation Immunity CE ComplianceEmissions Design Guidelines General SafetyInterfacing the Jackrabbit to Other Devices Jackrabbit BL1800 Getting Started Development Kit ContentsDevelopment Hardware Connections Attach Jackrabbit to Prototyping Board BoardAssemble AC Adapter Connect Programming CableConnect Power Installing Dynamic C Run a Sample Program TroubleshootingReal-Time Clock Where Do I Go From Here?Technical Support BL1800 SubsystemsHeaders Jackrabbit PinoutsDigital Inputs Digital Inputs/OutputsHV3 Sourcing Output Digital OutputsConfigurable High-Current Output Changing HV3 to a Sinking Output Bidirectional I/OA/D Converter Schematic Diagram of A/D ConverterJackrabbit BL1800 D/A Converters Schematic Diagram of D/A Converters1 DA1 V ⋅ 1 e RCTypical DA1 Voltages for Various Duty Cycles Typical DA0 Voltages for Various Duty Cycles 2 DA0User’s Manual 1 RS-232 Serial Communication2 RS-485 Ground recommended 485 R16 Programming PortUser’s Manual Programming Cable Changing Between Program Mode and Run ModeSram MemoryFlash Eprom External Interrupts Other HardwareClock Doubler Spectrum Spreader Jackrabbit BL1800 An Overview of Dynamic C Software ReferenceJackrabbit BL1800 Jackrabbit Sample Programs Sample ProgramsSample Program DEMOJR1.C DEMOJR1.CWatch Expression Break Point Single-SteppingEditing the Program Summary of FeaturesWatching Variables Dynamically User’s Manual Other Sample Programs Illustrating Digital I/O R/W pin and DB0-DB3 on 3 RS-232 Serial Communication Sample Programs 4 RS-485 Serial Communication Sample Program Cooperative Multitasking Int vswitch Advantages of Cooperative Multitasking 1 I/O Drivers Jackrabbit Function CallsVoid digOutint channel, int value Void anaOutint channel, int value Void anaInint channel, int *value Serial Communication Drivers Patches and Bug Fixes Upgrading Dynamic CAdd-On Modules Appendix A. Specifications Figure A-1shows the mechanical dimensions for the Jackrabbit Electrical and Mechanical SpecificationsTable A-1. Jackrabbit Board Specifications Exclusion Zones Exclusion ZoneFigure A-3. User Board Footprint for Jackrabbit Figure A-4. Location of Jackrabbit Configurable Positions Jumper ConfigurationsTable A-2. Jackrabbit Jumper Configurations Conformally coated area Conformal CoatingJackrabbit Use of Rabbit 2000 Parallel PortsTable A-3. Jackrabbit Pinout Configurations PD0 PD1 Jackrabbit BL1800 Appendix B. Prototyping Board Prototyping Board Overview Jackrabbit Connectors User LEDs BuzzerPrototyping Board Features Top Side Mechanical Dimensions and LayoutTop Side Using the Prototyping BoardRelay Demonstration BoardExisting Top Side Prototyping BoardPE0 VCC HV0 SM1 SM0 HV2 Stat Jackrabbit BL1800 Power Supplies Appendix C. Power ManagementDcin Current mA 950 mA·h = 5.4 years 20 µA Batteries and External Battery ConnectionsFigure C-5shows the Jackrabbit battery backup circuitry Battery Backup CircuitReset Generator Power to Vram SwitchChip Select Circuit Figure C-7shows a schematic of the chip select circuitJackrabbit BL1800 SMODE0 SMODE1 IndexRABDB01.C RABDB02.C Schematics
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