Roving RN-42 ============ TODO ---- Bug: - with Nexus5 keyboard and mouse are very laggy. Power saving: - 8MHz clock - When not connected in a few minutes get into deep sleep to save battery life - CTS is needed for waking up from deep sleep? How deep sleep is activated? - firmware controlled 3.3V DC converter to switch on/off BT module - sleep MCU and BT module(keyboard is not used) - deep sleep MCU and BT module(keyboard is not used for long time) - deep sleep MCU and turn off BT module(keyboard is not used and not connected) - Battery ADC; switching, high resistance - switching gnd end of divider with PF4 - high resistor 100K/1M? capacitor 10nF http://www.eevblog.com/forum/beginners/measuring-battery-voltage-without-consuming-current/ Improving: - BT LED; connecting, linked, sleeping, deep sleeping - Battry LED; blink(using timer?) - move rn42 to protocol directory when it becomes reusable stack - LUFA sendchar should be buffered and serial_uart.c buffur size is too large(256). - ADC resolution AVR120 AVR32138 Testing: - Factroy reset doesn't work; need to **test again** 10K pull-up is too high? - Lipo voltage ADC value is not stabilized - DCDC converter: squeaky inducter; try other inductors - Keymap layer bug: during space is pressed(mousekey) press Fn(HHKB) then release space before Fn, in result HHKB layer is locked(toggled) unintentionally. Done: - low battery alert(solid light) 09/04 Power routing ------------- Current: (USB) +---(Lipo) | | | | | +------+ DPDT | | |Switch/-----------------------+ | | +------+ | | +-------+ | | +-|Charger| | | | +-------+ | +---+ | | | |MCU| | | | +---+ | | | | | | | | | +--------------+ +-----+ +------+ +---/--+ +-----+ |Power Selector|--|DC 5V|--|DC3.3V|---|Switch|----|RN-42| +--------------+ +-----+ +------+ +------+ +-----+ USB Power is boosted unnecessarily, not harmful? Idea 1: (USB) +---(Lipo) | | | | | +------+ DPDT | | |Switch/----------+ | | +------+ | | +-------+ | | +-|Charger| | | | +-------+ | +---+ | | +-----+ |MCU| | | |DC 5V| +---+ | | +-----+ | | | | | | +--------------+ | +---/--+ +------+ +-----+ |Power Selector|-----+---|Switch|----|DC3.3V|-----|RN-42| +--------------+ +------+ +------+ +-----+ To enable BT when USB powered it still needs to turn siwtch on, Lipo consumes quinscent current at 5V converter in vain.(Not good) Idea 2: (USB) +---(Lipo) | | | | | +------+ | | |Switch| | | +------+ | +-------+ | +-|Charger| | | +-------+ | +---+ | +-----+ |MCU|----+ Controlled by firmware | |DC 5V| +---+ | On: Lipo powered | +-----+ | | Off: USB powered | | | |enable +--------------+ | +------+ +-----+ |Power Selector|-----+---|DC3.3V|-----|RN-42| +--------------+ +------+ +-----+ MCU can controlled power of RN-42 without hardware switch. When USB powered and switch is on Lipo consumes quinscent current at 5V converter in vain.(Not good) Idea 3: (USB) +---(Lipo) | | | | | +------+ | | |Switch|SPST(or without) | | +------+ | +-------+ | +-|Charger| | | +-------+ | +---+ | | |MCU|----+ Controlled by firmware | | +---+ | On: Lipo powered | | | | Off: USB powered | | | |enable +--------------+ +-----+ +------+ +-----+ |Power Selector|-|DC 5V|-|DC3.3V|-----|RN-42| +--------------+ +-----+ +------+ +-----+ Switch is needed to save Lipo when not used because decent power saving is not available now. If firmware can turn off BT module completely and make MCU deep sleep the switch will be not even needed. DONE: - BT_INDICATOR LED turns on wrongly when touching line or pin. -- pull-up enabled on PF6/GPIO2 08/30 - Lipo charger configuration: fast charge time: USB charger spec? -- used 2kohm - use LED of charger to alarm low battery. LED should be powered directly from Lipo? - cancel; powered from VUSB - Use RTS in serial_uart.c to resolve missing chars from help message of RN-42 - done - CTS/RTS lines are needed? just connect in loop back if no flow control is needed. - done - add IO pin to charger status CHRG; LED control(low) and detect charge status(input HiZ) 07.24 - LINKED: add trace on PIO2 to PF6 07.24 - Lipo voltage ADC sensing - Lipo charger MCP73831: needs capacitor 4.7uF *2 - USB connection check - 07.01 - BT on/off check: whether RX line is pulled up? - checking RTS 07.01 - USB/BT switching BT is on -> BT, BT is off -> USB - 07.01 - Under voltage lock out UVLO for protection of Lipo - Lipo has discharge protection at 3.100V 07.01 - Power saving: HHKB scan, BT radio control - 9h with 850mAh, this is enough 07.01 - Power selector doesn't work; Q4 MOSFET leaks from Lipo to USB power line. -- use Schottky instead 07/04 TROUBLE SHOOT ------------- 07/16 After fix of voltage dividor on GPIO6, had a trouble that it could not send a char to BT module, though could receive. Found R8 had wrong 1K resistor and changed to 10K, after that it can send to the module again. Not sure how it had sent with the wrong 1K before. 07/18 On Linux, had an USB related trouble; keyobard or console didn't work for some reason. Changing PID cured this problem. Very annoying, took very long time before resolved it. Lipo ---- 850mA lasts around 9 hours(07/28) Sparkfun Polymer Lithium Ion Battery 850mAh: https://www.sparkfun.com/products/341 Lipo Cell spec: https://www.sparkfun.com/datasheets/Batteries/063048%20Li-polymer.pdf Protection spec: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Prototyping/BatteryProtection.pdf min typical max over-charge 4.255 4.280 4.305 over-charge discover? 4.030 4.080 4.130 over-discharge 2.827 2.900 2.973 over-discharge discover 3.022 3.100 3.178 ADC voltage monitor: voltage divider 10K+10K(0.5) ADC=V*0.5/2.56*1024 V ADC ------------------ 4.20 0x347(839) 3.10 0x26b(619) Configuration ------------- Ver 6.15 04/26/2013 (c) Roving Networks ***Settings*** BTA=0006664B3AE3 BTName=tmkBT-3AE3 Baudrt(SW4)=115K Mode =DTR Authen=2 Bonded=0 Rem=000000000000 ***ADVANCED Settings*** SrvName= keyboard/mouse SrvClass=0000 DevClass=0000 InqWindw=0100 PagWindw=0100 CfgTimer=255 StatuStr=NULL HidFlags=3c DTRtimer=8 KeySwapr=0 ***OTHER Settings*** Profile= HID CfgChar= $ SniffEna=8010 LowPower=0 TX Power=0 IOPorts= 0 IOValues=0 Sleeptmr=0 DebugMod=0 RoleSwch=0 Serial connection ----------------- Serial line: 115200bps, 8bit, 1-stopbit, non-parity, no flow control SSP: 115200bps, 8bit, 1-stopbit, non-parity, no flow control(via Bluetooth) To enter command mode disconnect the module from host and type '$$$'.(you will see 'CMD') To exit type '---'(you will see 'END') and '+' to get local echo. Setting command mode -------------------- S-,tmkBT // Device name SS,keyboard/mouse // service name SM,4 // Auto Connect DTR mode SW,8010 // Sniff enable 0x10*0.625ms=10ms; 50ms is laggish and not much power save S~,6 // HID profile SH,003C // HID register SY,0004 // Transmit power Other options: SC,0000 // COD: 000005C0 (see HID spec/Bluegiga doc) SD,05C0 // bit 12-8 7 6 5-0 // 00101 1 1 0 // peripheral pointing keybaord joystick, gamepad, ... SM,6 // Pairing mode: auto connect SM,4 // Master mode: Connection can be controled with GPIO6 HID profile ----------- S~,6 HID profile S~,0 SPP profile R,1 reboot Apple iOS --------- Keyboard can be used with iPhone, but mouse cannot. To operate iOS with keyboard is not so useful, though. There may be iOS specific scancodes? HID flag register ----------------- SH,0200 GH 10 0000 0000(0200) default 00 0011 1000(0038) Combo || | | |\_\____ number of paired devices to which the module can reconnect || | | \_______ send out reports over UART (0xFF ) || \__\_________ descriptor type |\______________ toggle virtual keyboard on iOS when first connected \_______________ Force HID mode if GPIO11 is high on power-up Descriptor type: 0000: keybaord 0001: Game Pad 0010: Mouse 0011: Combo 0100: Joystick 1xxx: reserved Out report - Indicator ---------------------- 0xFE 0x02 0x01 LED Status ---------- Configuring 10 times per sec Startup/configuration timer 2 times per sec Discoverable/Inquiring/Idle once per sec Connected solid on Pairing ------- First, host initiates pairing process and once it is done, auto connect will work thereafter. SM,3 Master mode SM,4 Auto Connect DTR Mode uses GPIO6 to make and break connection(Mode =DTR) confirm: auto connect works and control connection with GPIO6 SM,5 Auto Connect ANY Mode (Mode =ANY) each time GPIO is set, make inquiry and connect to the first found device SM,6 automatically reconnect(Mode =Pair) confirm: auto connect works well but difficult to enter command mode. Fast data mode -------------- The module enters fast data mode after 'remote configuration timer' window is passed from power on. In this mode the module does not accept '$$$' to enter command mode. Power Management ---------------- Inquiry and Page window Idle or Active (3.1.1) Downside: delay in discovery or connection time SI, // set inquiry scan window(discovery) on/off duty? SJ, // set page scan window(connection) This reduces averaege power >20mA to 5mA(3mA in Sniff mode) Sniff mode Transmit Sniff mode is disabled by default and radio is active continuously when connected.(25-30mA) In Sniff mode the radio wakes up intermittently and sleeps in very low power mode.(2mA) SW, // set interval timer(*0.625ms) 0000-7FFF Deep sleep Idle (3.1.2) In this mode the module shuts down completly and only draws about 300uA. To enable this set the most signifant bit(0x8000) of Sniff interaval timer. SW,8320 // deep sleep enable(interval=0x320*0.625=500ms) In normal sleep the firmware is still running in idle mode, and wakes up about 20 times per second to check ports, update LEDs, etc. During deep sleep, the firmware actually stops runnig some tasks and the LEDs only update about once per second. To wake from deep sleep there are three ways: (in worst case wake up takes 5ms) *send a charactor to the UART(first charactor will be lost) *toggle CTS low to high and wait 5ms *wake automatically every slot time(*0.625ms) Once the radio is awake it stay active for exactly 1 second of inactivity and then sleeps again. Downside: latency and data loss Disable Output driver Idle or Active (3.1.3) S%,1000 // set all GPIO pins(0-11) to inputs. Lower Transmit Power Idle or Active (3.1.4) SY, // transmit power setting(takes effect after a power cycle and reboot) Downside: reducing effective range Optimizig for Latency --------------------- By default the firmware is optimized for throughput. SQ,16 // set latency bit SQ,0 // unset latency bit Configuration timer settings ---------------------------- Remote configuration is used for the module to be configured with various commands over Bluetooth(SPP profile only?). The module has remote configuration timer to allow remote configuration over Bluetooth after power up in Slave mode. In Master modes the remote configuration timer is set to 0(no remote configuration). (In Trigger Master mode the timer is used as an idle timer to break the connection after time expires with no charactors receive.) ST,0 // no remote, no local when connected ST,<1-252> // local and remote with timeout in seconds from power up ST,253 // local only without timeout ST,254 // remote only without timeout ST,255 // local and remote without timeout Android ------- 3.7.1.5 Note: To connect with Android phone the modules must wake up 11ms every 2.5seconds. Commands -------- SC, SM, SD, SP, Pin code(alpahnumeric) SQ, Special configuration(GPIO, discovery mode, low latency, reboot, UART) SR, Store remote address SR,Z Erase all address SS, Set service name(1-20)** ST, Remote configuration timer(Master:0, Slave:0-255, Triger:as idle timer) SU, UART baud rate SW, low-power sniff mode** deep sleep and wake up every 625us * SX,<0|1> bonding enable only acceps device that matches the stored address SY, power setting** SZ, non-standard raw baud rate =baud*0.004096 S~, Profile 0:SPP, 5:APL, 6:HID S-, Device name -15 alphanumeric charactors S?,<0|1> role switch enable S$, command mode char $|, low-power connect mode deep sleep/active(discoverable and connectable) cycle D display basic setting E display extended setting GB display the device's Bluetooth address GF display Bluetooth address of connected device GK show connection status GR show remote address for reconnecting G& show GPIO pin G show stored setting + toggle local echo on/off & show GPIO 3,4,6,7(DIP switch) C connect to stored remote address C,
connect last address CFI connect and go into fast data mode CFR connect and go into fast data mode CT,
, connect to the address and disconnect after val? F,1 fast data mod: H display help I,