- Install CronMod on your HTC Desire (see this thread: http://forum.xda-developers.com/showthread.php?t=1946517 )
- build custom kernel with USB host mode support:
- git clone git@github.com:croniccorey/eternity-kernel.git
- git checkout remotes/origin/ics
- apply Host Mode patch:
- make clean
- make bravo_defconfig
- make menuconfig (select USB options, deselect USB gadget support)
- “Device Drivers => USB Support => USB Modem (CDC ACM) include as a module.
- $ grep MSM .config|grep -v ‘not set’|grep USB
CONFIG_USB_EHCI_MSM7201=y - make -j4
- Install kernel and modules to android device (zip file method through recovery – will post step by step once I get everything working)
- Enable host mode drivers:
- adb shell (opens a shell connection to android from your laptop)
- su
- mount -o remount,rw /
- mount -o remount,rw /system
- depmod -a
- IMPORTANT plug in a powered arduino to the htc desire usb port (using your OTG cable) before loading any USB modules otherwise the arduino will not be detected
- modprobe usbcore
- dmesg output:
<6>[ 140.937835] usbcore: registered new interface driver usbfs <6>[ 140.938232] usbcore: registered new interface driver hub <6>[ 140.941314] usbcore: registered new device driver usb
- modprobe ehci-hcd
- dmesg output will start with some good output like this:
[ 218.682006] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver [ 218.682342] ehci_hcd: block sizes: qh 60 qtd 96 itd 160 sitd 96 [ 218.682617] initializing MSM7201/QSD8X50 USB Controller [ 218.701751] msm_hsusb msm_hsusb: Qualcomm MSM7201/QSD8X50 On-Chip EHCI Host Controller [ 218.702148] msm_hsusb msm_hsusb: new USB bus registered, assigned bus number 1 [ 218.702392] msm_hsusb msm_hsusb: reset command 0080002 (park)=0 ithresh=8 period=1024 Reset HALT [ 218.702819] msm_hsusb msm_hsusb: park 0 [ 218.703002] msm_hsusb msm_hsusb: reset command 0080b02 park=3 ithresh=8 period=1024 Reset HALT [ 218.721771] AVS setting V to 1200 mV @760 MHz [ 218.722229] msm_hsusb msm_hsusb: ...powerdown ports... [ 218.751770] msm_hsusb msm_hsusb: irq 58, io mem 0xa0800000 [ 218.772155] usb usb1: default language 0x0409 [ 218.772399] usb usb1: udev 1, busnum 1, minor = 0 [ 218.772613] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002 [ 218.773010] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 218.773376] usb usb1: Product: Qualcomm MSM7201/QSD8X50 On-Chip EHCI Host Controller [ 218.773620] usb usb1: Manufacturer: Linux 2.6.38.8-EternityKernel-ICS-1.3-GSM-RC-dtbaker ehci_hcd [ 218.774017] usb usb1: SerialNumber: msm_hsusb [ 218.774658] usb usb1: usb_probe_device [ 218.775573] usb usb1: configuration #1 chosen from 1 choice [ 218.781036] usb usb1: adding 1-0:1.0 (config #1, interface 0) [ 218.790649] hub 1-0:1.0: usb_probe_interface [ 218.790985] hub 1-0:1.0: usb_probe_interface - got id [ 218.798156] AVS setting V to 1250 mV @859 MHz [ 218.800445] hub 1-0:1.0: USB hub found [ 218.804229] hub 1-0:1.0: 1 port detected [ 218.808135] hub 1-0:1.0: standalone hub [ 218.811920] hub 1-0:1.0: individual port power switching [ 218.818847] hub 1-0:1.0: individual port over-current protection [ 218.823364] hub 1-0:1.0: Single TT [ 218.826507] hub 1-0:1.0: TT requires at most 8 FS bit times (666 ns) [ 218.833007] AVS setting V to 1300 mV @1002 MHz [ 218.838653] hub 1-0:1.0: power on to power good time: 20ms [ 218.843139] hub 1-0:1.0: local power source is good [ 218.847930] hub 1-0:1.0: enabling power on all ports
- Then probably display an error like this:
<4>[ 121.077850] ------------[ cut here ]------------ <4>[ 121.081909] WARNING: at kernel/irq/manage.c:291 0xc00a87f0() <4>[ 121.087646] Unbalanced enable for IRQ 58 <4>[ 121.091430] Modules linked in: ehci_hcd(+) usbcore bcm4329 <4>[ 121.096923] Backtrace: <4>[ 121.099426] Function entered at [<c003f09c>] from [<c0427dfc>] <4>[ 121.105163] r7:c00a87f0 r6:c0454fe7 r5:00000123 r4:d7199d18 <4>[ 121.110809] Function entered at [<c0427de4>] from [<c006b5d4>] <4>[ 121.116607] Function entered at [<c006b578>] from [<c006b690>] <4>[ 121.122558] r9:c04f0cf0 r8:d812a644 r7:c04d2e18 r6:0000003a r5:60070013 <4>[ 121.128936] r4:c04e53d0 <4>[ 121.131561] Function entered at [<c006b658>] from [<c00a87f0>] <4>[ 121.137481] r3:0000003a r2:c0455045 <4>[ 121.140930] Function entered at [<c00a879c>] from [<c00a8df0>] <4>[ 121.146850] r5:60070013 r4:c04e53d0 <4>[ 121.150299] Function entered at [<c00a8d5c>] from [<bf04d6f4>] <4>[ 121.156250] r7:c04d2e18 r6:c04d2e10 r5:00000000 r4:d812a400 <4>[ 121.161773] Function entered at [<bf04d4d8>] from [<c0252c6c>] <4>[ 121.167694] Function entered at [<c0252c4c>] from [<c02517f0>] <4>[ 121.173400] Function entered at [<c025172c>] from [<c0251918>] <4>[ 121.179321] r7:00000000 r6:bf055ddc r5:c04d2e4c r4:c04d2e18 <4>[ 121.184844] Function entered at [<c02518b0>] from [<c0250f24>] <4>[ 121.190795] r7:00000000 r6:c02518b0 r5:d7199df0 r4:bf055ddc <4>[ 121.196319] Function entered at [<c0250ed0>] from [<c0251614>] <4>[ 121.202239] r7:00000000 r6:c04da220 r5:cb9320e0 r4:bf055ddc <4>[ 121.207763] Function entered at [<c02515f0>] from [<c02507d4>] <4>[ 121.213714] Function entered at [<c025071c>] from [<c0252058>] <4>[ 121.219390] Function entered at [<c0251f9c>] from [<c02530e0>] <4>[ 121.225341] Function entered at [<c0253084>] from [<bf058094>] <4>[ 121.231018] Function entered at [<bf058000>] from [<c0035388>] <4>[ 121.236968] r4:bf055e38 <4>[ 121.239349] Function entered at [<c00352a4>] from [<c009d534>] <4>[ 121.245300] Function entered at [<c009c404>] from [<c003b040>] <4>[ 121.251007] ---[ end trace 2d5c07135d1ce6e9 ]---
this error can apparently can be safely ignored
- then the dmesg output will contain information about connected usb devices:
[ 219.261657] usb 1-1: new full speed USB device using msm_hsusb and address 2 [ 219.322021] AVS setting V to 1250 mV @245 MHz [ 219.411682] usb 1-1: ep0 maxpacket = 8 [ 219.415496] usb 1-1: skipped 3 descriptors after interface [ 219.416442] usb 1-1: default language 0x0409 [ 219.425262] usb 1-1: udev 2, busnum 1, minor = 1 [ 219.425476] usb 1-1: New USB device found, idVendor=20a0, idProduct=4150 [ 219.425903] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=220 [ 219.426147] usb 1-1: Product: Eleven [ 219.426513] usb 1-1: Manufacturer: www.freetronics.com [ 219.426757] usb 1-1: SerialNumber: 7493430303035120F1C1 [ 219.427551] usb 1-1: usb_probe_device [ 219.427764] usb 1-1: configuration #1 chosen from 1 choice [ 219.430053] usb 1-1: adding 1-1:1.0 (config #1, interface 0) [ 219.430419] usb 1-1: adding 1-1:1.1 (config #1, interface 1)
- Success – android is reading that there is a freetronics eleven arduino attached via usb! progress!
- EDIT: DON’T NEED USBSERIAL, SEE ACM MODULE BELOW: modprobe usbserial vendor=0X20a0 product=0X4150 (values from idVendor and idProduct above in dmesg output) this creates a /dev/ttyUSB0 device and the following dmesg output
- modprobe cdc-acm
- this creates /dev/ttyACM0 on the android device – woot!
- load this basic sketch onto an arduino:
void setup() { // put your setup code here, to run once: Serial.begin(9600); Serial.println("init"); } void loop() { // put your main code here, to run repeatedly: Serial.println("loop"); delay(500); } - Run this on android to setup the /dev/ttyACM0 correctly:
stty -F /dev/ttyACM0 cs8 9600 ignbrk -brkint -icrnl -imaxbel -opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke noflsh -ixon -crtscts - Then try to read from the raw serial device like so:
cat /dev/ttyACM0 - You should see output like:
localhost dtbaker # cat /dev/ttyACM0 init loop loop loop loop loop loop loop loop ^C
reset the arduino if you get nothing
- Some further testing / diagnostics:
- Install the android app USB Host Diagnostics https://play.google.com/store/apps/details?id=eu.chainfire.usbhostdiagnostics&hl=en
- launch the app and click run diagnostics, wait a bit, grant superuser access (a few times if needed), it will probably popup saying it can fix some problems, click OK and reboot the device as per the instructions
- repeat the steps above (loading the modules) after reboot, plug in the arduino again and launch the USB Host Diagnostics app again