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DRIVERS.md
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@ -325,8 +325,8 @@ soft SPI may be used but hard may be faster. See note on overclocking below.
case, `color_setup.py` initialises it and the settings will be left in place. case, `color_setup.py` initialises it and the settings will be left in place.
If the bus is shared with devices which require different settings, a callback If the bus is shared with devices which require different settings, a callback
function should be passed. It will be called prior to each SPI bus write. The function should be passed. It will be called prior to each SPI bus write. The
callback will receive a single arg being the SPI bus instance. It will callback will receive a single arg being the SPI bus instance. It will
typically be a one-liner or lambda initialising the bus. A minimal example is typically be a one-liner or lambda initialising the bus. A minimal example is
this function: this function:
```python ```python
def spi_init(spi): def spi_init(spi):
@ -383,7 +383,9 @@ These displays tend to be physically small with a high pixel density. The chip
supports up to 240x320 displays. The Adafruit units tested are 240x240. To keep supports up to 240x320 displays. The Adafruit units tested are 240x240. To keep
the buffer size down, the driver uses 4-bit color with dynamic conversion to 16 the buffer size down, the driver uses 4-bit color with dynamic conversion to 16
bit RGB565 at runtime. This uses a lookup table (LUT) enabling user defined bit RGB565 at runtime. This uses a lookup table (LUT) enabling user defined
colors. The resultant buffer size for the Adafruit displays is 28800 bytes. colors. The resultant buffer size for the Adafruit displays is 28800 bytes. See
[Color handling](./DRIVERS.md#11-color-handling) for the implications of 4-bit
color.
[Tested display](https://www.adafruit.com/product/4313). The Adafruit [Tested display](https://www.adafruit.com/product/4313). The Adafruit
[1.54 inch](https://www.adafruit.com/product/3787) has identical resolution and [1.54 inch](https://www.adafruit.com/product/3787) has identical resolution and
@ -412,8 +414,8 @@ below.
case, `color_setup.py` initialises it and the settings will be left in place. case, `color_setup.py` initialises it and the settings will be left in place.
If the bus is shared with devices which require different settings, a callback If the bus is shared with devices which require different settings, a callback
function should be passed. It will be called prior to each SPI bus write. The function should be passed. It will be called prior to each SPI bus write. The
callback will receive a single arg being the SPI bus instance. It will callback will receive a single arg being the SPI bus instance. It will
typically be a one-liner or lambda initialising the bus. A minimal example is typically be a one-liner or lambda initialising the bus. A minimal example is
this function: this function:
```python ```python
def spi_init(spi): def spi_init(spi):
@ -449,6 +451,11 @@ On Adafruit displays, combinations that don't produce mirror images are:
3. `PORTRAIT | REFLECT` Portrait mode (rotate 90° CCW). 3. `PORTRAIT | REFLECT` Portrait mode (rotate 90° CCW).
4. `PORTRAIT | USD` Upside down portrait (rotate 90° CW). 4. `PORTRAIT | USD` Upside down portrait (rotate 90° CW).
#### Use with uasyncio
Running the SPI bus at 60MHz a refresh blocks for 83ms. Considering whether to
offer a solution as per ili9341.
###### [Contents](./DRIVERS.md#contents) ###### [Contents](./DRIVERS.md#contents)
# 4. Drivers for sharp displays # 4. Drivers for sharp displays