Send data to a PS3 DualShock3 controller from a Mac (IOHIDDeviceSetReport) - macos

Question

I've been playing around with the HID part of IOKit lately on my Mac with a PS3 controller. I've managed to look though the sample code and connect to my controller, receive a stream of data and parse it (Everything, including the accelerometer and gyro).
However, today I decided I wanted to start setting the LEDs on the back of the device and triggering the rumble motors, but I just can't get it to work!
Looking though the sample code Apple provides for IOHID there isn't much I can see on setting things on the HID device, only receiving data. From looking on the web (for petty much half a day) I've got what I think is a working send method which uses IOHIDDeviceSetReport(). However, I can't work out what data I should be sending.
I've found several sites that list data examples:
http://www.circuitsathome.com/mcu/ps3-and-wiimote-game-controllers-on-the-arduino-host-shield-part-2
https://github.com/ribbotson/USB-Host/blob/master/ps3/PS3USB/ps3_usb.h
http://wiibrew.org/wiki/Sixaxis
(I know not all these examples are for between Mac an a PS3 controller)
A lot of people seem to be talking about this and even doing it (I refuse to believe no one has got this working) but I can't seem to find anything about actually how to do it that works!
I feel like I am missing a simple step here, so if anyone has any ideas, help or a solution please let me know.
Thanks.
Example Code of how I'm trying to send a report (is is returning success):
CFIndex len = 64;
uint8_t report[64] = {0x0};
IOReturn tIOReturn = IOHIDDeviceSetReport(deviceRef,
kIOHIDReportTypeOutput,
reportID,
report,
len);
This is just sending a lot of nothing (literally) but it's just an example of what I'm using just incase it's not correct.
Extra: I've also just noticed that Apples defenition of IOHIDDeviceSetReport differes from there example given.
https://developer.apple.com/library/mac/documentation/DeviceDrivers/Conceptual/HID/new_api_10_5/tn2187.html#//apple_ref/doc/uid/TP40000970-CH214-SW81
There it says report should be "address of report buffer". But...
https://developer.apple.com/library/mac/documentation/IOKit/Reference/IOHIDDevice_iokit_header_reference/Reference/reference.html#//apple_ref/doc/uid/TP40012408-CHIOHIDDevicehFunctions-DontLinkElementID_23
There it say *report (being a pointer) is "The report bytes to be sent to the device.".

Answer 1

there's an example at: http://www.circuitsathome.com/mcu/ps3-and-wiimote-game-controllers-on-the-arduino-host-shield-part-2
with the code describing the LED and Rumble control at:
https://github.com/ribbotson/USB-Host/blob/master/ps3/PS3USB/ps3_usb.cpp#L187
It seems that the bytes that you sent as report need to have a certain format:
prog_char output_01_report[] PROGMEM = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x02, 0xff, 0x27, 0x10, 0x00, 0x32, 0xff,
0x27, 0x10, 0x00, 0x32, 0xff, 0x27, 0x10, 0x00,
0x32, 0xff, 0x27, 0x10, 0x00, 0x32, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
In the LEDRumble function, these bytes are copied into buf and then buf[9] is overridden to set the LED state and the bytes from buf[1] through buf[4] are used to configure the Rumble. The the bytes are all sent to the controller.
There are some constants defined here: https://github.com/ribbotson/USB-Host/blob/master/ps3/PS3USB/ps3_usb.h#L100
#define psLED1 0x01
#define psLED2 0x02
#define psLED3 0x04
#define psLED4 0x08
#define psRumbleHigh 0x10
#define psRumbleLow 0x20
These constants are passed to the LEDRumble function as parameters.

Answer 2

Their example seems fine, as far as I've read it. Under these circumstances, either an uint8_t[64] variable or an uint8_t* variable will be both interpreted as a pointer to uint8_t when passed to IOHIDDeviceSetReport.
I'm on a restricted network right now, so I won't be able to help any further. But I'll try to read a little bit more about this later at home, as I also have a related project in mind. If I find out anything that can help us on this, I'll get back here to talk about it.