Warning: This work in progress may contain bugs or incorrect documentation.
This is a driver for MicroPython for devices using the esp_lcd intel 8080 8-bit parallel bus and SPI interfaces. The driver is written in C and is based on devbis' st7789_mpy driver.
I modified the original driver to add the following features:
The firmware directory contains pre-compiled MicroPython v1.20.0 firmware compiled using ESP IDF v4.4.4. In addition, the firmware includes the C driver and several frozen Python font files. See the README.md file in the fonts folder for more information about the font files.
Note: Curly braces { and } enclose optional parameters and do not imply a Python dictionary.
s3lcd.I80_BUS(data, dc, wr, {rd, cs, pclk, bus_width, lcd_cmd_bits, lcd_param_bits, dc_idle_level, dc_cmd_level, dc_dummy_level, dc_data_level, cs_active_high, reverse_color_bits, swap_color_bytes, pclk_active_neg, pclk_idle_low})
This method sets the interface configuration of an intel 8080 parallel bus for the ESPLCD driver. The ESPLCD driver will automatically initialize and deinitialize the I80 bus.
data tuple of pin numbers attached to the data bus in least to most significant bit orderdc data/command pin numberwr write pin numberrd read pin numbercs chip select pin numberpclk pixel clock frequency in Hzbus_width bus width in bitslcd_cmd_bits number of bits used to send commands to the LCDlcd_param_bits number of bits used to send parameters to the LCDdc_idle_level D/C pin level when idledc_cmd_level D/C pin level when sending commandsdc_dummy_level D/C pin level when sending dummy datadc_data_level D/C pin level when sending datacs_active_high CS pin level when activereverse_color_bits reverse the order of color bitsswap_color_bytes swap the order of color bytespclk_active_neg pixel clock is active negativepclk_idle_low pixel clock is idle lows3lcd.SPI_BUS(spi_host, sck, mosi, dc, {cs, spi_mode, pclk, lcd_cmd_bits, lcd_param_bits, dc_idle_level, dc_as_cmd_phase, dc_low_on_data, octal_mode, lsb_first, swap_color_bytes})
This method sets the interface configuration of an SPI bus for the ESPLCD driver. The ESPLCD driver will automatically initialize and deinitialize the SPI bus.
spi_host SPI host to use.
sck sck pin number
mosi MOSI pin number
dc D/C pin number
cs CS pin number
spi_mode Traditional SPI mode (0~3)
pclk Frequency of pixel clock
lcd_cmd_bits Bit-width of LCD command
lcd_param_bits Bit-width of LCD parameter
dc_idle_level D/C pin level when idle
dc_as_cmd_phase D/C line value is encoded into SPI transaction command phase
dc_low_on_data If this flag is enabled, D/C line = 0 means transfer data, D/C line = 1 means transfer command
octal_mode transmit using octal mode (8 data lines)
lsb_first transmit LSB bit first
swap_color_bytes (bool) Swap data byte order
s3lcd.ESPLCD(bus, width, height, {reset, rotations, rotation, inversion, dma_rows, options})
bus I80_BUS or SPI_BUS objectwidth display widthheight display heightreset reset pin number
rotations Creates a custom rotation table. A rotation table is a list of tuples for each rotation containing the width, height, x_gap, y_gap, swap_xy, mirror_x, and mirror_y values for each rotation.
Default rotations are included for the following display sizes:
| Display | Default Orientation Tables |
|---|---|
| 320x480 | ((320, 480, 0, 0, false, true, false), (480, 320, 0, 0, true, false, false), (320, 480, 0, 0, false, false, true), (480, 320, 0, 0, true, true, true)) |
| 240x320 | ((240, 320, 0, 0, false, false, false), (320, 240, 0, 0, true, true, false), (240, 320, 0, 0, false, true, true), (320, 240, 0, 0, true, false, true)) |
| 170x320 | ((170, 320, 35, 0, false, false, false), (320, 170, 0, 35, true, true, false), (170, 320, 35, 0, false, true, true), (320, 170, 0, 35, true, false, true)) |
| 240x240 | ((240, 240, 0, 0, false, false, false), (240, 240, 0, 0, true, true, false), (240, 240, 0, 80, false, true, true), (240, 240, 80, 0, true, false, true)) |
| 135x240 | ((135, 240, 52, 40, false, false, false), (240, 135, 40, 53, true, true, false), (135, 240, 53, 40, false, true, true), (240, 135, 40, 52, true, false, true)) |
| 128x160 | ((128, 160, 0, 0, false, false, false), (160, 128, 0, 0, true, true, false), (128, 160, 0, 0, false, true, true), (160, 128, 0, 0, true, false, true)) |
| 80x160 | ((80, 160, 26, 1, false, false, false), (160, 80, 1, 26, true, true, false), (80, 160, 26, 1, false, true, true), (160, 80, 1, 26, true, false, true)) |
| 128x128 | ((128, 128, 2, 1, false, false, false), (128, 128, 1, 2, true, true, false), (128, 128, 2, 3, false, true, true), (128, 128, 3, 2, true, false, true)) |
You may define up to 4 rotations.
rotation sets the active display rotation according to the orientation table.
The default orientation table defines four counterclockwise rotations for 240x320, 240x240, 134x240, 128x160, 80x160, and 128x128 displays with the LCD's ribbon cable at the bottom of the display. The default rotation is Portrait (0 degrees).
| Index | Rotation |
|---|---|
| 0 | Portrait (0 degrees) |
| 1 | Landscape (90 degrees) |
| 2 | Reverse Portrait (180 degrees) |
| 3 | Reverse Landscape (270 degrees) |
inversion Sets the display color inversion mode if True and clears the color inversion mode if false.
dma_rows Sets the number of the framebuffer rows to transfer to the display in a single DMA transaction. The default value is 16 rows. Larger values may perform better but use more DMA-capable memory from the ESP-IDF heap. On the other hand, using a large value may starve other ESP-IDF functions like WiFi of memory.
options Sets driver option flags.
| Option | Description |
|---|---|
| s3lcd.WRAP | pixels, lines, polygons, and Hershey text will wrap around the display both horizontally and vertically. |
| s3lcd.WRAP_H | pixels, lines, polygons, and Hershey text will wrap around the display horizontally. |
| s3lcd.WRAP_V | pixels, lines, polygons, and Hershey text will wrap around the display vertically. |
deinit()
Frees the buffer memory and deinitializes the I80_BUF or SPI_BUF object. Call this method before reinitializing the display without performing a hard reset.
idle_mode(value)
Set idle mode
value: True to enable idle mode, False to idle disable idle mode.
show()
Update the display from the framebuffer. You must use the show() method to transfer the framebuffer to the display. This method blocks until the display refresh is complete.
inversion_mode(bool) Sets the display color inversion mode if True, clears the display color inversion mode if False.
init()
Must be called to initialize the display.
clear({ 8_bit_color})
Fast clear the framebuffer by setting the high and low bytes of the color to the specified value.
Optional parameters: -- 8_bit_color defaults to 0x00 BLACK
fill({color, alpha})
Fill the framebuffer with the specified color, optionally alpha blended with the background. The color defaults to BLACK, and the alpha defaults to 255.
pixel(x, y {, color, alpha})
Set the specified pixel to the given color. The color defaults to WHITE, and the alpha defaults to 255.
line(x0, y0, x1, y1 {, color, alpha})
Draws a single line with the provided color from (x0, y0) to (x1, y1). The color defaults to BLACK, and the alpha defaults to 255.
hline(x, y, w {, color, alpha})
Draws a horizontal line with the provided color and length in pixels. The color defaults to BLACK, and the alpha defaults to 255.
vline(x, y, length {, color, alpha})
Draws a vertical line with the provided color and length in pixels. The color defaults to BLACK, and the alpha defaults to 255.
rect(x, y, width, height {, color, alpha})
Draws a rectangle with the specified dimensions from (x, y'). Thecolordefaults to BLACK, and thealpha` defaults to 255.
fill_rect(x, y, width, height {, color, alpha})
Fills a rectangle width by height starting at x, y' withcoloroptionallyalphablended with the background. Thecolordefaults to BLACK, andalpha` defaults to 255.
circle(x, y, r {, color, alpha})
Draws a circle with radius r centered at the (x, y') coordinates in the givencolor. Thecolordefaults to BLACK, and thealpha` defaults to 255.
fill_circle(x, y, r {, color, alpha})
Draws a filled circle with radius r centered at the (x, y') coordinates in the givencolor. Thecolordefaults to BLACK, and thealpha` defaults to 255.
blit_buffer(buffer, x, y, width, height {, alpha})
Copy bytes() or bytearray() content to the framebuffer. Note: every color requires 2 bytes in the array, the alpha defaults to 255.
text(font, s, x, y {, fg, bg, alpha})
Writes text to the framebuffer using the specified bitmap font with the coordinates as the upper-left corner of the text. The optional arguments fg and bg can set the foreground and background colors of the text; otherwise, the foreground color defaults to WHITE, and the background color defaults to BLACK. alpha defaults to 255. See the README.md in the fonts/bitmap directory, for example fonts.
write(bitmap_font, s, x, y {, fg, bg, alpha})
Writes text to the framebuffer using the specified proportional or Monospace bitmap font module starting with the coordinates as the upper-left corner of the text. The foreground and background colors of the text are set by the optional arguments fg and bg; otherwise, the foreground color defaults to WHITE, and the background color defaults to BLACK. The alpha defaults to 255.
See the README.md in the truetype/fonts directory, for example fonts. Returns the width of the string as printed in pixels. This method accepts UTF8 encoded strings.
The font2bitmap utility creates compatible 1-bit per pixel bitmap modules from Proportional or Monospaced True Type fonts. The character size, foreground, background colors, and characters in the bitmap module may be specified as parameters. Use the -h option for details.
write_len(bitap_font, s)
Returns the string's width in pixels if printed in the specified font.
draw(vector_font, s, x, y {, fg, scale, alpha})
Draws text to the framebuffer using the specified Hershey vector font with the coordinates as the lower-left corner of the text. The foreground color of the text can be set by the optional argument fg. Otherwise, the foreground color defaults to WHITE. The size of the text is modified by specifying a scale value. The scale value must be larger than 0 and can be a floating-point or an integer value. The scale value defaults to 1.0. The alpha defaults to 255. See the README.md in the vector/fonts directory, for example fonts and the utils directory for a font conversion program.
draw_len(vector_font, s {, scale})
Returns the string's width in pixels if drawn with the specified font.
jpg(jpg, x, y)
Draws a JPG file in the framebuffer at the given x and `y' coordinates as the upper left corner of the image. This method requires an additional 3100 bytes of memory for its work buffer. The jpg may be a filename or a bytes() or bytearray() object. The jpg will wil be clipped if is not able to fit fully in the framebuffer.
jpg_decode(jpg_filename {, x, y, width, height})
Decodes a jpg file and returns it or a portion of it as a tuple composed of (buffer, width, height). The buffer is a color565 blit_buffer compatible byte array. The buffer will require width height 2 bytes of memory.
If the optional x, y, width, and height parameters are given, the buffer will only contain the specified area of the image. See examples/T-DISPLAY/clock/clock.py and examples/T-DISPLAY/toasters_jpg/toasters_jpg.py for examples.
png(png, x, y)
Draws a PNG file in the framebuffer with the upper left corner of the image at the given x and `y' coordinates. The png may be a filename or a bytes() or bytearray() object. The png will wil be clipped if it is not able to fit fully in the framebuffer. Transparency is supported; see the alien.py program in the examples/png folder.
png_write(file_name{ x, y, width, height})
Writes the framebuffer to a png file named file_name using PNGenc from https://github.com/bitbank2/PNGenc.
Returns file size in bytes.
polygon_center(polygon)
Returns the center of the polygon as an (x, y) tuple. The polygon should consist of a list of (x, y) tuples forming a closed convex polygon.
fill_polygon(polygon, x, y, color {, alpha, angle, center_x, center_y})
Draws a filled polygon at the x, and y' coordinates in thecolorgiven. Thealphadefaults to 255. The polygon may be rotatedangleradians about thecenter_xandcenter_y` points. The polygon should consist of a list of (x, y) tuples forming a closed convex polygon.
See the TWATCH-2020 watch.py demo for an example.
polygon(polygon, x, y, color {, alpha, angle, center_x, center_y)
Draws a polygon at the x, and y' coordinates in thecolorgiven. Thealphadefaults to 255. The polygon may be rotatedangleradians about thecenter_xandcenter_y` points. The polygon should consist of a list of (x, y) tuples forming a closed convex polygon.
See the roids.py for an example.
bitmap(bitmap, x , y {, alpha, index}) or bitmap((bitmap_as_bytes, w, h), x , y {, alpha})
Draws a bitmap using the specified x, y' coordinates as the upper-left corner of thebitmap`.
If the bitmap parameter is a bitmap module, the index parameter may be specified to select a specific bitmap from the module. The index parameter must be an integer value greater than or equal to 0 and less than the number of bitmaps in the module. The index value defaults to 0. 8-bit per pixel.
If the bitmap_module parameter is a tuple, the tuple must contain a bitmap as a byte array, the width of the bitmap in pixels, and the height of the bitmap in pixels. alpha defaults to 255.
Using the Pillow Python Imaging Library, the imgtobitmap.py utility creates compatible 1 to 8-bit per-pixel bitmap modules from image files.
The monofont2bitmap.py utility creates compatible 1 to 8-bit per-pixel bitmap modules from Monospaced True Type fonts. See the inconsolata_16.py, inconsolata_32.py and inconsolata_64.py files in the examples/mono_fonts folder for sample modules and the mono_font.py program for an example using the generated modules.
You can specify the character sizes, foreground and background colors, bit per pixel, and characters to include in the bitmap module as parameters. To learn more, use the -h option. Using bit-per-pixel settings larger than one can create antialiased characters at the cost of increased memory usage.
width()
Returns the current width of the display in pixels. (i.e., a 135x240 display rotated 90 degrees is 240 pixels wide)
height()
Returns the current height of the display in pixels. (i.e., a 135x240 display rotated 90 degrees is 135 pixels high)
rotation(r)
Sets the rotation of the logical display in a counterclockwise direction. 0-Portrait (0 degrees), 1-Landscape (90 degrees), 2-Inverse Portrait (180 degrees), 3-Inverse Landscape (270 degrees)
scroll(xstep, ystep{, fill=0})
Scrolls the framebuffer using software in the given direction.
The module exposes predefined colors:
BLACK, BLUE, RED, GREEN, CYAN, MAGENTA, YELLOW, and WHITE
The st7789 display controller contains a 240 by 320-pixel frame buffer used to store the pixels for the display. For scrolling, the frame buffer consists of three separate areas: The (tfa) top fixed area, the (height) scrolling area, and the (bfa) bottom fixed area. The tfa is the upper portion of the frame buffer in pixels not to scroll. The height is the center portion of the frame buffer in pixels to scroll. The bfa is the lower portion of the frame buffer in pixels not to scroll. These values control the ability to scroll the entire or a part of the display.
For displays that are 320 pixels high, setting the tfa to 0, height to 320, and bfa to 0 will allow scrolling of the entire display. To scroll a portion of the display, you can set the tfa and bfa to a non-zero value. tfa + height + bfa = should equal 320; otherwise, the scrolling mode is undefined.
Displays less than 320 pixels high, the tfa, height, and bfa must be adjusted to compensate for the smaller LCD panel. The actual values will vary depending on the configuration of the LCD panel. For example, scrolling the entire 135x240 TTGO T-Display requires a tfa value of 40, height value of 240, and bfa value of 40 (40+240+40=320) because the T-Display LCD shows 240 rows starting at the 40th row of the frame buffer, leaving the last 40 rows of the frame buffer undisplayed.
Other displays, like the Waveshare Pico LCD 1.3-inch 240x240 display, require the tfa set to 0, height set to 240, and bfa set to 80 (0+240+80=320) to scroll the entire display. The Pico LCD 1.3 shows 240 rows starting at the 0th row of the frame buffer, leaving the last 80 rows undisplayed.
The vscsad method sets the (VSSA) Vertical Scroll Start Address. The VSSA sets the line in the frame buffer that will be the first line after the tfa.
The ST7789 datasheet warns:
The value of the vertical scrolling start address is absolute (with referenceto the frame memory), it must not enter the fixed area defined by Vertical Scrolling Definition, otherwise undesirable image will be displayed on the panel.vscrdef(tfa, height, bfa) Set the vertical scrolling parameters.
tfa is the top fixed area in pixels. The top fixed area is the upper portion of the display frame buffer that will not be scrolled.
height is the total height in pixels of the area scrolled.
bfa is the bottom fixed area in pixels. The bottom fixed area is the lower portion of the display frame buffer that will not be scrolled.
vscsad(vssa) Set the vertical scroll address.
vssa is the vertical scroll start address in pixels. The vertical scroll start address is the line in the frame buffer that will be the first line shown after the TFA.
color565(r, g, b)
Pack a color into 2-byte rgb565 format
map_bitarray_to_rgb565(bitarray, buffer, width {, color, bg_color})
Convert a bitarray to the rgb565 color buffer suitable for blitting. Bit
1 in bitarray is a pixel with color and 0 - with bg_color.
See the MicroPython Getting Started page for more detailed information on building the MicroPython firmware.
git clone git@github.com:micropython/micropython.git
git clone https://github.com/russhughes/s3lcd.gitCompile the cross compiler if you haven't already
make -C micropython/mpy-crossChange to the ESP32 port directory
cd micropython/ports/esp32Compile the module with specified USER_C_MODULES dir
make USER_C_MODULES=../../../../s3lcd/src/micropython.cmake clean submodules allErase the target device if this is the first time uploading this firmware
make USER_C_MODULES=../../../../s3lcd/src/micropython.cmake eraseUpload the new firmware
make USER_C_MODULES=../../../../s3lcd/src/micropython.cmake deployChange to the ESP32 port directory, and build the firmware
cd micropython/ports/esp32
make \
BOARD=ESP32_GENERIC \
BOARD_VARIANT=SPIRAM \
USER_C_MODULES=../../../../s3lcd/src/micropython.cmake \
FROZEN_MANIFEST=../../../../s3lcd/manifest.py \
clean submodules allErase the flash and deploy on your device
make \
BOARD=ESP32_GENERIC \
BOARD_VARIANT=SPIRAM \
USER_C_MODULES=../../../../s3lcd/src/micropython.cmake \
FROZEN_MANIFEST=../../../../s3lcd/manifest.py \
erase deployChange to the RP2 port directory, and build the firmware
cd micropython/ports/rp2
make \
BOARD=RPI_PICO \
FROZEN_MANIFEST=../../../../gc9a01c/manifest.py \
USER_C_MODULES=../../../gc9a01c/src/micropython.cmake \
clean submodules allFlash the firmware.uf2 file from the build-${BOARD} directory to your device.
-- Russ