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Clarify rgb.write_raw arguments

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sanderdh 2019-08-22 15:29:44 +02:00 committed by Tim 'mithro' Ansell
parent 43e9a4b439
commit 34a21c876e
1 changed files with 9 additions and 6 deletions
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15
README.md
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@ -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