i500 Pumpkin Board

The i500 pumpkin is using the i500 (MT8385) platform.

Purchasing

The i500 pumpkin board is made by OLogic. To request a pumpkin i500, please contact OLogic.

Building

You can build an image for the i500 pumpkin board by setting the MACHINE variable in your local.conf to i500-pumpkin.

MACHINE=i500-pumpkin

For full build instructions, please refer to the top level README.md.

Displays

The i500 Pumpkin board supports the following display:

If you wish to use the URT UMO 9465MD-T display, the related overlay is recipes-kernel/dtbo/mt8183-pumpkin/panel-urt-umo9465md.dts

To use the 7-inch Raspberry Pi touch display, the related overlay is recipes-kernel/dtbo/mt8183-pumpkin/panel-raspberrypi.dts

Warning

Using one of these overlay require you to plug the DSI display to the pumpkin board. Failing to connect it will prevent HDMI from working. If you only want HDMI, you should not use these overlay.

Cameras

The i500 Pumpkin board supports the following csi camera configs:

  • Onsemi AR0330 (single or dual) raw sensors

  • Onsemi AP1302 (single or dual) ISPs + AR0330 / AR0144 (single or dual) sensors

  • Onsemi AP1302 (single) ISP + AR1335 (single) sensor

Onsemi AR0330 (single or dual) raw sensors

You need to use the following dtbo depending the number of AR0330 sensors you have:

  • camera-ar0330-single.dtbo : one AR0330

  • camera-ar0330-dual.dtbo : two AR0330

For example, you should use recipes-kernel/dtbo/mt8183-evb/camera-ar0330-single.dts if you have only one AR0330

Onsemi AP1302 (single or dual) ISPs + AR0330 / AR0144 (single or dual) sensors

Two AP1302 ISPs is supported, the first ISP can support up to two AR0330 sensors, while the second ISP can support up to two AR0144 sensors.

Currently, only the following combinations are supported:

  • camera-ap1302-ar0330-single.dtbo : one AP1302 + one AR0330

  • camera-ap1302-ar0144-single.dtbo : one AP1302 + one AR0144

  • camera-ap1302-ar0144-dual.dtbo : one AP1302 + dual AR0144

  • camera-ap1302-ar0330-single-ar0144-single.dtbo : one AP1302 + one AR0330 and one AP1302 + one AR0144

  • camera-ap1302-ar0330-single-ar0144-dual.dtbo : one AP1302 + one AR0330 and one AP1302 + dual AR0144

For example, you should use recipes-kernel/dtbo/mt8183-evb/camera-ap1302-ar0330-single.dts if you have one AP1302 + one AR0330 combination:

Onsemi AP1302 (single) ISP + AR1335 (single) sensor

The second ISP (which is capable of supporting AR0144 sensor) is capable of supporting AR1335 sensor too.

To load the dtbo corresponding to AP1302 + AR1335 single, you should use recipes-kernel/dtbo/mt8183-evb/camera-ap1302-ar1335-single.dts

Audio

Playback

By default, the i500 Pumpkin board ouputs audio on the jack connector.

It is possible to output the audio on the 2 channels I2S out device present on the 40 pins header instead. To switch to this output, you will need to change several alsa settings using the following commands:

amixer set -c mt8183mt6358 'ADDA_DL_CH1 DL1_CH1',0 off
amixer set -c mt8183mt6358 'ADDA_DL_CH2 DL1_CH2',0 off
amixer set -c mt8183mt6358 'I2S1_CH1 DL1_CH1',0 on
amixer set -c mt8183mt6358 'I2S1_CH2 DL1_CH2',0 on

In order to move back to jack output, simply put back the original settings by using the following commands:

amixer set -c mt8183mt6358 'ADDA_DL_CH1 DL1_CH1',0 on
amixer set -c mt8183mt6358 'ADDA_DL_CH2 DL1_CH2',0 on
amixer set -c mt8183mt6358 'I2S1_CH1 DL1_CH1',0 off
amixer set -c mt8183mt6358 'I2S1_CH2 DL1_CH2',0 off

Capture

By default, the i500 Pumpkin board captures audio using the jack microphone.

The following command is an example that will start a mono record with a sampling rate of 48kHz and a signed 32bits bit format:

arecord -c 1 -r 48000 -f s32_le recorded_file.wav

It is possible to record using the 4 channels I2S in device present on the 40 pins header instead. In this case, the 2ch I2S device will have to be specified as follows:

arecord -D 4ch_mic -c 4 -r 48000 -f s32_le recorded_file.wav

Note that it is possible to record 1, 2 or 4 channels using this device.

40 pins header configuration

Here is the pin configuration to use the audio devices present on the 40 pins header:

Header pin

Function

32

I2S2_MCK

29

I2S2_BCK

33

I2S2_LRCK

38

I2S2_DI

31

I2S2_DI2

11

I2S1_MCK

12

I2S1_BCK

35

I2S1_LRCK

40

I2S1_DO

I2S devices can be connected to these pins and, provided they don’t need any configuration and as a consequence don’t need any codec, they will work without any additional modifications. Regarding the I2S 4 channels in device, we can imagine using 2 x 2 channels I2S devices. In that case, the devices will share the same MCK, LRCK and BCK but will have a different data line each (DI or DI2).

MT7668 wireless chipset

The i500 Pumpkin board is integrating a MT7668 wireless chipset. By default the chipset comes with no MAC or BD address. Please refer to the MT7668 wireless chipset documentation to see how to program a MAC or BD address.

Device-Tree Overlays (DTBO)

The following Device-Tree Overlays are supported:

  • panel-raspberrypi.dtbo: Raspberry Pi touch display (see Displays section)

  • panel-urt-umo-9465md.dtbo: URT UMO display (see Displays section)

  • camera-ar0330-single.dtbo: single AR0330CS camera (see Cameras section)

  • camera-ar0330-dual.dtbo: dual AR0330CS cameras (see Cameras section)

  • camera-ap1302-ar0330-single.dtbo: single AR0330CS camera with AP1302 ISP (see Cameras section)

  • camera-ap1302-ar0144-single.dtbo: single AR0144 camera with AP1302 ISP (see Cameras section)

  • camera-ap1302-ar0144-dual.dtbo: dual AR0144 cameras with AP1302 ISP (see Cameras section)

  • camera-ap1302-ar0330-single-ar0144-single.dtbo: single AR0330CS and single AR0144 cameras with dual AP1302 ISPs (see Cameras section)

  • camera-ap1302-ar0330-single-ar0144-dual.dtbo: single AR0330CS and dual AR0144 cameras with dual AP1302 ISPs (see Cameras section)

FTDI board control

The FTDI chip connected to the DEBUG (CN7) port is able to control the power (PWRKEY), reset (SYSRST), and download (KPCOL0) lines.

FTDI GPIO Line

Function

0

Power (PWRKEY)

1

Reset (SYSRST)

2

Download (KPCOL0)

Note

By default the FTDI chip is not configured to use these 3 lines. Please refer to the AIoT tools manual to see how to configure and control these 3 lines.

Limitations

The software image has the following limitations:

  • The 2 USB Type-A port (CN3) and the Ethernet port (CN5) can be used only when no cable is connected to the USB Type-C CN2 port. This is a hardware limitation that prevents USB host and USB device to be usable at the same time.