-- *************************************************************************** -- 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)