kopia lustrzana https://github.com/peterhinch/micropython-nano-gui
ST7735r 1.44 inch drivers: enable rotation.
Peter Hinch
rodzic
4d0c1c4dd1
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059d9c3705
59
DRIVERS.md
59
DRIVERS.md
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@ -191,9 +191,15 @@ def spi_init(spi):
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# 4. Drivers for ST7735R
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These are cross-platform but assume `micropython.viper` capability. They use
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8-bit color to minimise the RAM used by the frame buffer.
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* `st7735r.py` Supports [Adafruit 1.8" display](https://www.adafruit.com/product/358).
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* `st7735r144.py` Supports [Adafruit 1.44" display](https://www.adafruit.com/product/2088).
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8-bit or 4-bit color to minimise the RAM used by the frame buffer.
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Drivers for [Adafruit 1.8" display](https://www.adafruit.com/product/358).
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* `st7735r.py` 8-bit color.
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* `st7735r_4bit.py` 4-bit color for further RAM reduction.
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For [Adafruit 1.44" display](https://www.adafruit.com/product/2088).
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* `st7735r144.py` 8-bit color.
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* `st7735r144_4bit` 4 bit color.
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Users of other ST7735R based displays should beware: there are many variants
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with differing setup requirements.
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@ -208,7 +214,7 @@ The `color_setup.py` file should initialise the SPI bus with a baudrate of
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12_000_000. Args `polarity`, `phase`, `bits`, `firstbit` are defaults. Hard or
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soft SPI may be used but hard may be faster.
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#### ST7735R Constructor args:
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#### ST7735R Constructor args 1.8" display:
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* `spi` An initialised SPI bus instance. The device can support clock rates of
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upto 15MHz.
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* `cs` An initialised output pin. Initial value should be 1.
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@ -219,12 +225,29 @@ soft SPI may be used but hard may be faster.
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* `width=160`
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* `usd=False` Upside down: set `True` to invert display.
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* `init_spi=False` This optional arg enables flexible options in configuring
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the SPI bus. The default assumes exclusive access to the bus with
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`color_setup.py` initialising it. Those settings will be left in place. If a
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callback function is passed, it will be called prior to each SPI bus write:
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this is for shared bus applications. The callback will receive a single arg
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being the SPI bus instance. In normal use it will be a one-liner or lambda
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initialising the bus. A minimal example is this function:
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the SPI bus. See below.
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#### ST7735R144 Constructor args 1.44" display:
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* `spi` An initialised SPI bus instance. The device can support clock rates of
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upto 15MHz.
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* `cs` An initialised output pin. Initial value should be 1.
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* `dc` An initialised output pin. Initial value should be 0.
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* `rst` An initialised output pin. Initial value should be 1.
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* `height=128` Display dimensions in pixels.
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* `width=128`
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* `rotation=0` Pass 0, 90, 180 or 270 to rotate the display.
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* `init_spi=False` This optional arg enables flexible options in configuring
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the SPI bus. See below.
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#### The init_spi constructor arg
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The `False` default assumes exclusive access to the bus. It is initialised by
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`color_setup.py` and those settings are left in place. If a callback function
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is passed, it will be called prior to each SPI bus write. This is for shared
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bus applications. The callback will receive a single arg being the SPI bus
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instance. In normal use it will be a one-liner or lambda initialising the bus.
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A minimal example is this function which caters for the case where another
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program may have changed the baudrate:
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```python
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def spi_init(spi):
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spi.init(baudrate=12_000_000) # Data sheet: max is 12MHz
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@ -531,8 +554,18 @@ long as `.rgb()` and the "on the fly" converter match, this is arbitrary.
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The `Writer` (monochrome) or `CWriter` (color) classes and the `nanogui` module
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should then work automatically.
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Drivers for displays using I2C may need to use
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[I2C.writevto](http://docs.micropython.org/en/latest/library/machine.I2C.html?highlight=writevto#machine.I2C.writevto)
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depending on the chip requirements.
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The following script is useful for testing color display drivers after
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configuring `color_setup.py`. It draws squares at the extreme corners of the
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display and a corner to corner diagonal.
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```python
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from color_setup import ssd # Create a display instance
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from gui.core.nanogui import refresh
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refresh(ssd, True) # Initialise and clear display.
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ssd.fill(0)
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ssd.line(0, 0, ssd.width - 1, ssd.height - 1, ssd.rgb(0, 255, 0)) # Green diagonal
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ssd.rect(0, 0, 15, 15, ssd.rgb(255, 0, 0)) # Red square at top left
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ssd.rect(ssd.width -15, ssd.height -15, 15, 15, ssd.rgb(0, 0, 255)) # Blue square at bottm right
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ssd.show()
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```
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###### [Contents](./DRIVERS.md#contents)
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@ -49,7 +49,7 @@ class ST7735R(framebuf.FrameBuffer):
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return (r & 0xe0) | ((g >> 3) & 0x1c) | (b >> 6)
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# rst and cs are active low, SPI is mode 0
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def __init__(self, spi, cs, dc, rst, height=128, width=128, init_spi=False):
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def __init__(self, spi, cs, dc, rst, height=128, width=128, rotation=0, init_spi=False):
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self._spi = spi
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self._rst = rst # Pins
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self._dc = dc
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@ -63,7 +63,11 @@ class ST7735R(framebuf.FrameBuffer):
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self._mvb = memoryview(buf)
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super().__init__(buf, self.width, self.height, mode)
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self._linebuf = bytearray(self.width * 2) # 16 bit color out
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self._init()
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quad, mod = divmod(rotation, 90) # Get quadrant
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if mod or quad > 3:
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quad %= 4
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print('Warning: rotation adjusted to', quad * 90)
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self._init(quad)
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self.show()
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# Hardware reset
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@ -95,7 +99,7 @@ class ST7735R(framebuf.FrameBuffer):
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self._cs(1)
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# Initialise the hardware. Blocks 500ms.
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def _init(self):
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def _init(self, quad):
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self._hwreset() # Hardware reset. Blocks 3ms
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if self._spi_init: # A callback was passed
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self._spi_init(self._spi) # Bus may be shared
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@ -119,13 +123,18 @@ class ST7735R(framebuf.FrameBuffer):
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cmd(b'\x20') # INVOFF
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# d7..d5 of MADCTL determine rotation/orientation
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wcd(b'\x36', b'\xe0') # MADCTL: RGB landscape mode for 1.4" display
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# (MADCTL_DATA, ColumnOffset, RowOffset)
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rval, co, ro = ((b'\x20', 1, 2),
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(b'\x40', 2, 1),
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(b'\xe0', 3, 2),
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(b'\x80', 2, 3))[quad]
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wcd(b'\x36', rval) # MADCTL: rotation mode for 1.44" display
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wcd(b'\x3a', b'\x05') # COLMOD 16 bit
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wcd(b'\xe0', b'\x02\x1c\x07\x12\x37\x32\x29\x2d\x29\x25\x2B\x39\x00\x01\x03\x10') # GMCTRP1 Gamma
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wcd(b'\xe1', b'\x03\x1d\x07\x06\x2E\x2C\x29\x2D\x2E\x2E\x37\x3F\x00\x00\x02\x10') # GMCTRN1
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wcd(b'\x2a', int.to_bytes((3 << 16) + self.width + 2, 4, 'big')) # CASET
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wcd(b'\x2b', int.to_bytes((2 << 16) + self.height + 2, 4, 'big')) # RASET
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wcd(b'\x2a', int.to_bytes((co << 16) + self.width + co - 1, 4, 'big')) # CASET
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wcd(b'\x2b', int.to_bytes((ro << 16) + self.height + ro - 1, 4, 'big')) # RASET
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cmd(b'\x13') # NORON
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sleep_ms(10)
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@ -52,7 +52,7 @@ class ST7735R(framebuf.FrameBuffer):
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return (r & 0xf8) << 5 | (g & 0x1c) << 11 | (g & 0xe0) >> 5 | (b & 0xf8)
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# rst and cs are active low, SPI is mode 0
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def __init__(self, spi, cs, dc, rst, height=128, width=128, init_spi=False):
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def __init__(self, spi, cs, dc, rst, height=128, width=128, rotation=0, init_spi=False):
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self._spi = spi
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self._rst = rst # Pins
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self._dc = dc
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@ -66,7 +66,11 @@ class ST7735R(framebuf.FrameBuffer):
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self._mvb = memoryview(buf)
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super().__init__(buf, self.width, self.height, mode)
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self._linebuf = bytearray(self.width * 2) # 16 bit color out
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self._init()
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quad, mod = divmod(rotation, 90) # Get quadrant
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if mod or quad > 3:
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quad %= 4
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print('Warning: rotation adjusted to', quad * 90)
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self._init(quad)
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self.show()
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# Hardware reset
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@ -98,7 +102,7 @@ class ST7735R(framebuf.FrameBuffer):
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self._cs(1)
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# Initialise the hardware. Blocks 500ms.
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def _init(self):
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def _init(self, quad):
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self._hwreset() # Hardware reset. Blocks 3ms
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if self._spi_init: # A callback was passed
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self._spi_init(self._spi) # Bus may be shared
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@ -122,13 +126,18 @@ class ST7735R(framebuf.FrameBuffer):
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cmd(b'\x20') # INVOFF
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# d7..d5 of MADCTL determine rotation/orientation
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wcd(b'\x36', b'\xe0') # MADCTL: RGB landscape mode for 1.4" display
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# (MADCTL_DATA, ColumnOffset, RowOffset)
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rval, co, ro = ((b'\x20', 1, 2),
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(b'\x40', 2, 1),
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(b'\xe0', 3, 2),
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(b'\x80', 2, 3))[quad]
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wcd(b'\x36', rval) # MADCTL: rotation mode for 1.44" display
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wcd(b'\x3a', b'\x05') # COLMOD 16 bit
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wcd(b'\xe0', b'\x02\x1c\x07\x12\x37\x32\x29\x2d\x29\x25\x2B\x39\x00\x01\x03\x10') # GMCTRP1 Gamma
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wcd(b'\xe1', b'\x03\x1d\x07\x06\x2E\x2C\x29\x2D\x2E\x2E\x37\x3F\x00\x00\x02\x10') # GMCTRN1
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wcd(b'\x2a', int.to_bytes((3 << 16) + self.width + 2, 4, 'big')) # CASET
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wcd(b'\x2b', int.to_bytes((2 << 16) + self.height + 2, 4, 'big')) # RASET
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wcd(b'\x2a', int.to_bytes((co << 16) + self.width + co - 1, 4, 'big')) # CASET
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wcd(b'\x2b', int.to_bytes((ro << 16) + self.height + ro - 1, 4, 'big')) # RASET
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cmd(b'\x13') # NORON
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sleep_ms(10)
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