pingu_98/fomu-workshop
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Merge pull request #29 from sanderdh/master

Browse source 
clarify rgb.write_raw arguments
This commit is contained in:
Tim Ansell 2019-08-22 16:02:32 +02:00 committed by GitHub
commit 5456610441
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 9 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

15
README.md
View file

@ -335,18 +335,21 @@ The blinking LED is actually a hardware block from Lattice. It has control regi
There is a wrapper in Python that simplifies the process of writing to these registers. The first argument is the register number, and the second argument is the value to write.
For the `LEDDPWR` registers, the second argument determines the brightness, value ranges from 0 to 255.
Try changing the color of the three LEDs:
```python
>>> LED_PULSE_WIDTH_RED = 0b0001 # LEDDPWRR
>>> LED_PULSE_WIDTH_GREEN = 0b0010 # LEDDPWRG
>>> LED_PULSE_WIDTH_BLUE = 0b0011 # LEDDPWRG
>>> rgb.write_raw(LED_PULSE_WIDTH_RED, 255)
>>> rgb.write_raw(LED_PULSE_WIDTH_GREEN, 14)
>>> rgb.write_raw(LED_PULSE_WIDTH_BLUE, 1)
>>> ADDR_RED_LED_PULSE_WIDTH = 0b0001 # LEDDPWRR
>>> ADDR_GREEN_LED_PULSE_WIDTH = 0b0010 # LEDDPWRG
>>> ADDR_BLUE_LED_PULSE_WIDTH = 0b0011 # LEDDPWRB
>>> rgb.write_raw(ADDR_RED_LED_PULSE_WIDTH, 255) # Red LED fully on
>>> rgb.write_raw(ADDR_GREEN_LED_PULSE_WIDTH, 14) # Green LED mostly off
>>> rgb.write_raw(ADDR_BLUE_LED_PULSE_WIDTH, 1) # Blue LED off
>>>
```
The color should change immediately. More information on these registers can be found in the [iCE40 LED Driver Usage Guide](reference/FPGA-TN-1288-ICE40LEDDriverUsageGuide.pdf).
## Fomu as a CPU