hm01b0_machikania

Arducam HM01B0 camera interface for MachiKania

How to use this code in MachiKania

Copy "auxcode" directory to MachiKania source code and build entier MachiKania. The version of MachiKania must be 1.4 or later.

Connection

Connect the camera to Pi Pico as follows:

Ardcam   Pico

   VCC   3V3 Out
   SCL   GP5
   SDA   GP4
 VSYNC   GP27
  HREF   GP7
  PCLK   GP6
    D0   GP1
   GND   GND

MachiKania statements

Following statements will be added to MachiKania BASIC

HM01B0_INIT x
    Initialize camera interface. x is the pointer to 104976(324x324) bytes buffer.
HM01B0_CAPTURE
    Capture an image and store to buffer.
HM01B0_DRAW
    Draw the image on LCD.
HM01B0_REG_WRITE x,y
    Write the value (y; 8 bit integer) to the register (x; 16 bit integer).
HM01B0_ZOOM x,y
    Zoom (2x) into rectangle area starting from (x,y). This statement must be used after HM01B0_CAPTURE statement.
HM01B0_ANALYZE([x])
	Returns the pointer to dimension containing 8 integer, which are numbers of pixels with value of 0x00-0x1f, 0x20-0x3f, 0x40-0x5f, 0x60-0x7f, 0x80-0x9f, 0xa0-0xbf, 0xc0-0xdf, and 0xe0-0xff, respectively. x is the number of rows analyzed (default: 240).

Example BASIC code

print "Start"
dim b(324*324/4)
HM01B0_INIT b
HM01B0_REG_WRITE 0x0101,0x00 : REM Disable horizontal mirror
HM01B0_REG_WRITE 0x2100,0x00 : REM Disable automatic exposure
rem HM01B0_REG_WRITE 0x0202,0x00 : REM Set integration time (upper 8 bit)
rem HM01B0_REG_WRITE 0x0203,0x02 : REM Set integration time (lower 8 bit)
rem HM01B0_REG_WRITE 0x0205,0x30 : REM Set analog gain (either 0x00, 0x10, 0x20, or 0x30)
HM01B0_REG_WRITE 0x0104,0x01 : REM Hold parameter (required to send above register values)
print "HM01B0_INIT done"
HM01B0_CAPTURE
print "HM01B0_CAPTURE done"
wait 60
gosub set_palette
do
  HM01B0_DRAW
  wait 1
  HM01B0_CAPTURE
loop
end

label set_palette
  var i
  for i=8 to 255
    palette i,i,i,i
  next
return

License of files in this repository.

The license of codes here is LGPL ver 2.1.