MT9M111 is an Aptina 1,3 Mpixels sensor that can be found in the following commercial camera modules:
- other ?
Connecting the XXX module to the APF27
- CSI port (8 bits data + 4 bits control signals) is used to transmit images. (10 bits mode not usable on i.MX). These signals are available on the APF27Dev J9 connector (2,5V logic).
- I2C bus is used to configure the sensor. This bus is available on the APF27Dev J8 connector.
- Sensor core/IO power supply (2,5V) comes directly from J9 2,5V.
- (Preliminary) Schematics and layouts (for KiCAD) of an APF27 adaptation board are available [here].
- Bring module out of powerdown by driving SSI3_TX (pin 30 of port C) & SSI3_CLK (pin 31 of port C) as GPIOs (through GPIOlib):
echo 94 > /sys/class/gpio/export echo out > /sys/class/gpio/gpio94/direction echo 0 > /sys/class/gpio/gpio94/value; usleep 100000 echo 95 > /sys/class/gpio/export echo out > /sys/class/gpio/gpio95/direction echo 0 > /sys/class/gpio/gpio95/value; usleep 100000
- Load corresponding drivers:
# modprobe mx27_camera Linux video capture interface: v2.00 mx27-camera mx27-camera.0: initialising mx27-camera mx27-camera.0: Camera clock frequency: 33250006 mx27-camera mx27-camera.0: Using EMMA # modprobe mt9m111 camera 0-0: Camera driver attached to camera 0 mx27-camera mx27-camera.0: mclk_get_divisor not implemented. Running at max speed camera 0-0: Detected a MT9M11x chip ID 143a camera 0-0: Camera driver detached from camera 0
- You can then use Armadeus "capture" demo tool to get images from the camera.
- First time you will have to set the camera module registers correctly (not done by the driver yet) by using a custom script ov9653_regs.sh available [here]. Here is how to proceed:
# capture & usleep 400000 ; ./ov9653_regs.sh