MEMO

Integer Overflow/Rollover

https://arduino.stackexchange.com/a/12588

Arduino Timer:

• unsigned long millis()
• unsigned long micros()

unsigned long is 32-bit size on AVR. millis() rollovers in 49.7 days and micros() in 71.58 secs.

• https://www.norwegiancreations.com/2017/09/arduino-tutorial-using-millis-instead-of-delay/

AVR Integer Size

https://gcc.gnu.org/wiki/avr-gcc#Type_Layout

https://www.nongnu.org/avr-libc/user-manual/group__avr__stdint.html

IDEA

Minmal firmware Build

for non-keyboard project

• NO_KEYBOARD build option for minimal build
• 6KRO_ENABLE(boot keyboard compatible when report protocol)
• NKRO_ENABLE

currently keyboard function is built automatically without any options.

Mouse Scroll Wheel Emulation

two implementatons exists on PS/2 and ADB. One common impl to be shared by projects would be nice.

IBMPC buffer handling on send

Data on recv buffer can be removed by calling host_send(). TODO: Fix

MOUSE_ENABLE/MOUSEKEY_ENABLE Build Option

need to be organized

MOUSE_ENABLE is needed for mouse project without mouse key feature. It enables mouse output interface.

Control Endpoint 0

Send command to the endpoint for hidden functions.

UHS3

class

UHS_host/UHS_HID/UHS_HID.h

UHS_HID : UHS_USBInterface

• UHS_HID(UHS_USB_HOST_BASE *p, UHS_HID_PROCESSOR *hp)
• Start()
• OKtoEnumerate(ENUMERATION_INFO *ei)
• SetInterface(ENUMERATION_INFO *ei)
• Poll()
• DriverDefaults()
• driverPoll()
• GetAddress()
• Polling()
• OnRelease()
• SetIdle(iface, reportID, duration)
• SetProtocol(iface, protocol)
• SetReport(iface, report_type, report_id, nbytes, dataptr)
• ReportDescr(wIndex, nbytes, *buffer)

UHS_HID_PROCESSOR

• onStart(UHS_HID_base)
• onPoll(UHS_HID_base, data, length)
• onRelease(UHS_HID_base)

UHS_HID_base

HID drivers: RAW, KEYBOARD, MOUSE

• UHS_HID *parent
• UHS_HID_driver_t driver
• driverPoll()
• driverStart()
• driverRelease()
• writeReport(nbytes, *dataptr)

UHS_HID_RAW : UHS_HID_base

UHS_host/UHS_HID/HIDBOOT/UHS_HIDRAWBOOT_KEYBOARD.h

UHS_HIDBOOT_keyboard : UHS_HID_base

UHS_host/UHS_HID/HIDBOOT/UHS_HIDRAWBOOT_MOUSE.h

UHS_HIDBOOT_mouse : UHS_HID_base