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BLE SoCs from Texas Instruments:

• CC2540 (older)
• CC2541 (newer)

TI resources:

• IAR's Embedded Workbench for 8051 microprocessors:http://www.iar.com/Products/Wireless-solutions/Tools-for-TI-wireless/
• BLE SDK: http://ti.com/ble-stack, http://www.ti.com/tool/ble-stack
• BLE Wiki: http://ti.com/ble-wiki Complaints, that the BLE SDK is non-free and requires non-free software:
• http://e2e.ti.com/support/wireless_connectivity/f/538/t/136434.aspx?pi310978=1
• http://e2e.ti.com/support/wireless_connectivity/f/158/p/57743/205380.aspx#205380

Buy:

• http://www.tinyosshop.com/index.php?route=product/product&path=65_110&product_id=705
• http://www.tinyosshop.com/datasheet/Tinysine%20Serial%20Bluetooth4%20user%20manual.pdf

Ships with firmware and software from JNHuaMao.cn:

• http://www.jnhuamao.cn/download_rom_en.asp?id=
• Software is named "HMSoft"
• Module is named "HM-10": http://www.blueluminance.com/HM-10-as-iBeacon.pdf

Related projects:

• https://github.com/Jialn/HMSoftBLEGatt
• https://github.com/JianhaiYu/HMSoft-_ios6
• Wiring up the HM-10 to an Espruino: http://www.espruino.com/Bluetooth+BLE
• Hook up to an Arduino: http://www.instructables.com/id/How-to-Create-an-Arduino-Compatible-Bluetooth-40-M/step6/Arduino-BT-40-Module-Firmware-Master/
• Embed a BASIC interpreter: http://hackaday.io/project/2386-bluebasic-basic-for-bluetooth
• Firmware and other developer resources: https://github.com/nickswalker/ble-dev-kit
• Open Source Firmware: http://blog.p-dev.net/
• Use as keyboard/mouse transceiver: https://github.com/rampadc/cc2540-hidKbdM

Googled "Open Source BLE stack":

• https://code.google.com/p/btstack/
• http://redbearlab.com/blemini/ with "Biscuit" firmware ** https://github.com/RedBearLab/Biscuit
• http://www.thegeekstuff.com/2014/07/ti-ble-custom-profile/

Links:

• Firmware upgrade: http://letsmakerobots.com/node/40237

Projekt auf Interoberlin:

• https://redmine.interoberlin.de/projects/beacons

Open source software:

• https://en.wikipedia.org/wiki/8051_compiler
• SDCC: https://en.wikipedia.org/wiki/Small_Device_C_Compiler
• IDE: https://en.wikipedia.org/wiki/MCU_8051_IDE
• cc1111 (also a 8051): http://keithp.com/blogs/embedded_cpus/
• s51dude: programmer

Raspberry links:

• Serial port: http://www.raspberry-projects.com/pi/programming-in-c/uart-serial-port/using-the-uart
• GPIOs: http://raspberrypiguide.de/howtos/raspberry-pi-gpio-how-to/
• GPIOs in C: https://github.com/matthiasbock/bcm2835