bluetooth portal of power

Attribute points RF 2.4-ghz Bluetooth Low energy compliant and proprietary RF on-chip systems Supports 1 Mbps, 2 Mbps data transfer rates at Kbps, Kbps – Excellent link budget, enabling If there is no external remote application Front – Programmable output power of 0 dBm – Excellent reception sensitivity ( -94 dbm output power 1 Mbps), selectivity and bloc

Original URL: http://blog.csdn.net/zhangjs0322/article/details/39048939Android Low power Bluetooth app get started when getting to the Bluetooth sphygmomanometer all the services of the UUID are as follows:08-28 09:05:48.488:d/bluetoothgatt (4251): Ongetservice ()-Device=08:7c:be:21:d1:24 uuid= 00001800-0000-1000-8000-00805f9b34fb08-28 09:05:48.489:d/bluetoothgat

ATT: Overview 1. ATT (Attribute Protocol) In BLE, it is mandatory and used for all data transmission Fast, simple, independent of the connection logic 2. Client-Server architecture The server is used to store data (for example, our Nordic NRF51 series of chips can be used for the role of the server) The client is responsible for requesting data (e.g. Bluetooth mobile phone terminal) The server is responsible for initiating notif

OverviewSince Android 5.0, Google has added support for Android phones as a low-power Bluetooth peripheral, the service side. Enables mobile phones to communicate with each other through low-power Bluetooth.Development stepsIn fact, this function only needs to be divided into setting up the broadcast and setting up a server two parts to completeSetting up the ser

Classic Bluetooth is designed to unify computing and communications devices around the world, connecting mobile phones to laptops. Compared to classic Bluetooth, low-power Bluetooth has a relaxed radio parameter requirement for the physical layer, which meansLower power can

Physical Layer: Overview1.2.4GHzFree ISM Band 2.1mbits/sSignaling rate of 3.GFSK(Gosping shift keying, Gauss frequency shift keying) modulation 4. The maximum transmitting power reaches 4DBM5.40 xRF Channel 6.3 xThe broadcast channel is used to: (1). Found(2). Connection(3). Broadcast7.37 xData channelLink Layer: Overview1. Broadcast:can be connected and not connected2. Scan:Active or passive3. Slave machine:Connection role4. Host:Connection role 5.31

LEDs to OFF. // Set LED GPIOs to outputs. LED1_DDR |= LED1_BV;#if (!defined HAL_PA_LNA !defined HAL_PA_LNA_CC2590) LED2_DDR |= LED2_BV;#if (!defined CC2540_MINIDK !defined HAL_BOARD_CC2540USB) LED3_DDR |= LED3_BV;#endif#endif#if defined BLINK_LEDS HalLedStatusControl.sleepActive = FALSE; // Initialize sleepActive to FALSE.#endif#endif Macro definition /* 1 - Green */#define LED1_BV BV(0)#define LED1_SBIT P1_0#define LED1_DDR

Bluetooth from class1 ~ Class3 transmission distance is MB ~ 3 M. The typical maximum transmit power value is as follows: Class 1: 0 to + 20 dBm Class 2:-6 to + 4 dBm Class 3: up to 0 dBm You need to modify these pskeys first. Crystal frequency trimMake the crystal oscillator of the entire chip normal. Then adjust it as needed. TX and Rx Pio ControlTo see if external RF amplification is require

Bluetooth Low-Power BLE: Controls GPIO to light LEDs and blegpio This section describes the simplest and most basic things. The ios operation of the CC2540 uses the PORT as the GPIO. If you don't talk much about it, let's look at it. 1. Hardware Circuit The most simple hardware circuit is to use a GPIO to control the LED light. Since GPIO is used as the output, the GPIO mode is not required. It is quite si