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- -- ***************************************************************************
- -- Bitmaps Test
- --
- -- This script executes the bitmap features of u8glib to test their Lua
- -- integration.
- --
- -- Note: It is prepared for SSD1306-based displays. Select your connectivity
- -- type by calling either init_i2c_display() or init_spi_display() at
- -- the bottom of this file.
- --
- -- ***************************************************************************
- -- setup I2c and connect display
- function init_i2c_display()
- -- SDA and SCL can be assigned freely to available GPIOs
- local sda = 5 -- GPIO14
- local scl = 6 -- GPIO12
- local sla = 0x3c
- i2c.setup(0, sda, scl, i2c.SLOW)
- disp = u8g.ssd1306_128x64_i2c(sla)
- end
- -- setup SPI and connect display
- function init_spi_display()
- -- Hardware SPI CLK = GPIO14
- -- Hardware SPI MOSI = GPIO13
- -- Hardware SPI MISO = GPIO12 (not used)
- -- Hardware SPI /CS = GPIO15 (not used)
- -- CS, D/C, and RES can be assigned freely to available GPIOs
- local cs = 8 -- GPIO15, pull-down 10k to GND
- local dc = 4 -- GPIO2
- local res = 0 -- GPIO16
- spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, 8, 8)
- -- we won't be using the HSPI /CS line, so disable it again
- gpio.mode(8, gpio.INPUT, gpio.PULLUP)
- disp = u8g.ssd1306_128x64_hw_spi(cs, dc, res)
- end
- function xbm_picture()
- disp:setFont(u8g.font_6x10)
- disp:drawStr( 0, 10, "XBM picture")
- disp:drawXBM( 0, 20, 38, 24, xbm_data )
- end
- function bitmap_picture(state)
- disp:setFont(u8g.font_6x10)
- disp:drawStr( 0, 10, "Bitmap picture")
- disp:drawBitmap( 0 + (state * 10), 20 + (state * 4), 1, 8, bm_data )
- end
- -- the draw() routine
- function draw(draw_state)
- local component = bit.rshift(draw_state, 3)
- if (component == 0) then
- xbm_picture(bit.band(draw_state, 7))
- elseif (component == 1) then
- bitmap_picture(bit.band(draw_state, 7))
- end
- end
- function draw_loop()
- -- Draws one page and schedules the next page, if there is one
- local function draw_pages()
- draw(draw_state)
- if disp:nextPage() then
- node.task.post(draw_pages)
- else
- node.task.post(bitmap_test)
- end
- end
- -- Restart the draw loop and start drawing pages
- disp:firstPage()
- node.task.post(draw_pages)
- end
- function bitmap_test()
- if (draw_state <= 7 + 1*8) then
- draw_state = draw_state + 1
- else
- print("--- Restarting Bitmap Test ---")
- draw_state = 1
- end
- print("Heap: " .. node.heap())
- -- retrigger draw_loop
- node.task.post(draw_loop)
- end
- draw_state = 1
- init_i2c_display()
- --init_spi_display()
- -- read XBM picture
- file.open("u8glib_logo.xbm", "r")
- xbm_data = file.read()
- file.close()
- -- read Bitmap picture
- file.open("u8g_rook.bm", "r")
- bm_data = file.read()
- file.close()
- print("--- Starting Bitmap Test ---")
- node.task.post(draw_loop)
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