Difference between revisions of "SWLEDX8-I2C"
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** MCP23017 Port A connects to SWITCHES 0-7 on [[SWLEDX8]] | ** MCP23017 Port A connects to SWITCHES 0-7 on [[SWLEDX8]] | ||
** MCP23017 Port B connects to LEDs 0-7 on [[SWLEDX8]] | ** MCP23017 Port B connects to LEDs 0-7 on [[SWLEDX8]] | ||
| + | * Board Rev 2 reverses bit order for byte transfers can be used | ||
[[file:SWLEDX8-I2C_P1.PNG]] | [[file:SWLEDX8-I2C_P1.PNG]] | ||
| Line 85: | Line 86: | ||
[[file:SWLEDX8-I2C_P3.PNG]] | [[file:SWLEDX8-I2C_P3.PNG]] | ||
| + | |||
| + | {| class="wikitable" | ||
| + | ! I2C Address | ||
| + | ! J3(A2) | ||
| + | ! J3(A1) | ||
| + | ! J3(A0) | ||
| + | |- | ||
| + | | 0x0 | ||
| + | | In | ||
| + | | In | ||
| + | | In | ||
| + | |- | ||
| + | | 0x1 | ||
| + | | In | ||
| + | | In | ||
| + | | Out | ||
| + | |- | ||
| + | | 0x2 | ||
| + | | In | ||
| + | | Out | ||
| + | | In | ||
| + | |- | ||
| + | | 0x3 | ||
| + | | In | ||
| + | | Out | ||
| + | | Out | ||
| + | |- | ||
| + | | 0x4 | ||
| + | | Out | ||
| + | | In | ||
| + | | In | ||
| + | |- | ||
| + | | 0x5 | ||
| + | | Out | ||
| + | | In | ||
| + | | Out | ||
| + | |- | ||
| + | | 0x6 | ||
| + | | Out | ||
| + | | Out | ||
| + | | In | ||
| + | |- | ||
| + | | 0x7 | ||
| + | | Out | ||
| + | | Out | ||
| + | | Out | ||
| + | |- | ||
| + | |} | ||
== Drivers / Software Examples == | == Drivers / Software Examples == | ||
| Line 111: | Line 160: | ||
* [https://github.com/land-boards/lb-Python-Code/blob/master/MicroPython/PyBoard%20Clone/libraries/mcp23017/mcp23017.py PyBoard MicroPython Driver] | * [https://github.com/land-boards/lb-Python-Code/blob/master/MicroPython/PyBoard%20Clone/libraries/mcp23017/mcp23017.py PyBoard MicroPython Driver] | ||
| + | |||
| + | ==== CircuitPython ==== | ||
| + | |||
| + | * [https://github.com/land-boards/lb-boards/blob/master/Projects/QTPy/Land%20Boards/Land%20Boards%20QT%20Py%20Code/SWLEDX8.py SWLEDX8.py] = Control the card | ||
=== Raspberry Pi Pico === | === Raspberry Pi Pico === | ||
| Line 117: | Line 170: | ||
* [https://github.com/land-boards/RasPiPico/blob/main/PicoMite_MMBASIC/PicoMite_VGA/Land%20Boards%20BASIC%20Programs/SWLEDX8-01.bas SWLEDX8-01.bas] - Read 8x switches, write 8x LEDs | * [https://github.com/land-boards/RasPiPico/blob/main/PicoMite_MMBASIC/PicoMite_VGA/Land%20Boards%20BASIC%20Programs/SWLEDX8-01.bas SWLEDX8-01.bas] - Read 8x switches, write 8x LEDs | ||
| + | * [https://github.com/land-boards/RasPiPico/blob/main/PicoMite_MMBASIC/PicoMite_VGA/Land%20Boards%20BASIC%20Programs/lbcards/GPIO16-02.bas MMBASIC Example Code] - Bounce a bit across the 16-bits (not for use with [[SWLEDX8]] card) | ||
| + | * [https://github.com/land-boards/RasPiPico/blob/main/PicoMite_MMBASIC/PicoMite_VGA/Land%20Boards%20BASIC%20Programs/lbcards/swledx8-03.bas swledx8-03.bas] - Write alternating pattern to LEDs then read/write switches to LEDs | ||
=== I2C VHDL Code === | === I2C VHDL Code === | ||
| Line 132: | Line 187: | ||
* '''Not''' functionally the same as Rev X1 | * '''Not''' functionally the same as Rev X1 | ||
** Flips the data bits to match the [[SWLEDX8]] card | ** Flips the data bits to match the [[SWLEDX8]] card | ||
| − | *** Programs can | + | *** Programs can read/write in bytes (no shuffling of bits needed) |
* Change resistors from SMT (0805) to through hole (1/8W) | * Change resistors from SMT (0805) to through hole (1/8W) | ||
* Adds silkscreen Front/Rear | * Adds silkscreen Front/Rear | ||
Latest revision as of 10:35, 21 June 2022
Contents
Features
- 16-Bit Digital I/O card with a small form factor
- MCP23017 I/O Expander
- I2C interface
- Card can be used standalone or stacked together with the SWLEDX8 card
- I2C Daisy-Chain (In/Out) connectors
- (3) I2C Address select jumpers for up to 8 devices per I2C bus
- SCL/SDA termination jumpers
- 2x10 pins Digital I/O Header
- 16 digital pins
- 2 power, 2 ground pins
- 59mmx38mm
- (4) #4-40 mounting holes
- Software Drivers
Build Options
- There are a number of options for using the card
- Stacked option with SWLEDX8 card
- Small footprint option
- Low height/profile option
Stacked option with SWLEDX8 card
- SWLEDX8 card mounts above this card
- Pins can be directly mounted to both cards or male/female connector pairs can be used
_REV2.png)
Small footprint option
_REV2.png)
Low height/profile option
_REV2.png)
Rear Side Marking
_REV2.png)
Connectors
- Connectors are as follows
.PNG)
P1 - GPIO Pins
Connections to SWLEDX8 Card
- When paired with SWLEDX8
- Board Rev 2 reverses bit order for byte transfers can be used
P2 - I2C Interface
- 2X5 header
- Pinout
- GND
- VCC
- SDA
- SCL
- INTA
P3 - I2C Terminators / I2C Address Offset Jumpers
- Install left 2 jumpers to terminate I2C bus
- Typically, the "last" card in a chain
- Install right 3 jumpers for I2C base address offset in range 0x20 (all installed) to 0x27 (all removed)
| I2C Address | J3(A2) | J3(A1) | J3(A0) |
|---|---|---|---|
| 0x0 | In | In | In |
| 0x1 | In | In | Out |
| 0x2 | In | Out | In |
| 0x3 | In | Out | Out |
| 0x4 | Out | In | In |
| 0x5 | Out | In | Out |
| 0x6 | Out | Out | In |
| 0x7 | Out | Out | Out |
Drivers / Software Examples
- Any MCP23017 library should work with this card
- Here's our tested code
Arduino
- LandBoards MCP23017
- pinMode(uint8_t bit, uint8_t value) - Set bits 0-7=Input, 8-15=Output
- readGPIOA() - Read the 8 Switches
- writeOLATB(uint8_t baData) _ Write the 8 LEDs
- digitalRead(uint8_t bit) - read a single Switch (bit=0-7)
- digitalWrite(uint8_t bit, uint8_t wrVal) - write a single LED (nit=8-15)
- SWLEDX8_01.ino - Read 8 Switches, Write 8 LEDs
MicroPython Drivers
ESP32 MicroPython Driver
PyBoard MicroPython Driver
CircuitPython
- SWLEDX8.py = Control the card
Raspberry Pi Pico
MMBASIC
- SWLEDX8-01.bas - Read 8x switches, write 8x LEDs
- MMBASIC Example Code - Bounce a bit across the 16-bits (not for use with SWLEDX8 card)
- swledx8-03.bas - Write alternating pattern to LEDs then read/write switches to LEDs
I2C VHDL Code
Mechanicals
.PNG)
Versions
Rev 2
- Not functionally the same as Rev X1
- Flips the data bits to match the SWLEDX8 card
- Programs can read/write in bytes (no shuffling of bits needed)
- Flips the data bits to match the SWLEDX8 card
- Change resistors from SMT (0805) to through hole (1/8W)
- Adds silkscreen Front/Rear
- Added test block to rear
- Moves "Rev 2" silkscreen to rear
Rev X1
- Words, no issues
