107 lines
2.6 KiB
Lua
107 lines
2.6 KiB
Lua
-- ***************************************************************************
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-- Bitmaps Test
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--
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-- This script executes the bitmap features of u8glib to test their Lua
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-- integration.
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--
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-- Note: It is prepared for SSD1306-based displays. Select your connectivity
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-- type by calling either init_i2c_display() or init_spi_display() at
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-- the bottom of this file.
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--
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-- ***************************************************************************
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-- setup I2c and connect display
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function init_i2c_display()
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-- SDA and SCL can be assigned freely to available GPIOs
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local sda = 5 -- GPIO14
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local scl = 6 -- GPIO12
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local sla = 0x3c
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i2c.setup(0, sda, scl, i2c.SLOW)
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disp = u8g.ssd1306_128x64_i2c(sla)
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end
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-- setup SPI and connect display
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function init_spi_display()
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-- Hardware SPI CLK = GPIO14
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-- Hardware SPI MOSI = GPIO13
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-- Hardware SPI MISO = GPIO12 (not used)
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-- CS, D/C, and RES can be assigned freely to available GPIOs
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local cs = 8 -- GPIO15, pull-down 10k to GND
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local dc = 4 -- GPIO2
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local res = 0 -- GPIO16
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spi.setup(1, spi.MASTER, spi.CPOL_LOW, spi.CPHA_LOW, 8, 8)
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disp = u8g.ssd1306_128x64_hw_spi(cs, dc, res)
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end
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function xbm_picture()
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disp:setFont(u8g.font_6x10)
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disp:drawStr( 0, 10, "XBM picture")
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disp:drawXBM( 0, 20, 38, 24, xbm_data )
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end
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function bitmap_picture(state)
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disp:setFont(u8g.font_6x10)
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disp:drawStr( 0, 10, "Bitmap picture")
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disp:drawBitmap( 0 + (state * 10), 20 + (state * 4), 1, 8, bm_data )
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end
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-- the draw() routine
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function draw(draw_state)
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local component = bit.rshift(draw_state, 3)
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if (component == 0) then
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xbm_picture(bit.band(draw_state, 7))
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elseif (component == 1) then
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bitmap_picture(bit.band(draw_state, 7))
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end
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end
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function bitmap_test()
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dir = 0
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next_rotation = 0
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disp:firstPage()
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repeat
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draw(draw_state)
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until disp:nextPage() == false
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if (draw_state <= 7 + 1*8) then
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draw_state = draw_state + 1
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else
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print("--- Restarting Bitmap Test ---")
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draw_state = 1
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end
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print("Heap: " .. node.heap())
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-- retrigger timer to give room for system housekeeping
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tmr.start(0)
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end
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draw_state = 1
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init_i2c_display()
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--init_spi_display()
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-- read XBM picture
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file.open("u8glib_logo.xbm", "r")
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xbm_data = file.read()
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file.close()
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-- read Bitmap picture
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file.open("u8g_rook.bm", "r")
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bm_data = file.read()
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file.close()
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-- set up timer 0 with short interval, will be retriggered in graphics_test()
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tmr.register(0, 100, tmr.ALARM_SEMI, function() bitmap_test() end)
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print("--- Starting Bitmap Test ---")
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tmr.start(0)
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