lgt

+

+# DVA9999-dat

+

+

+## Info

+

+product url -

+

+### Board Map, Dimension, Pins, chip info, Use Guide, Setup Jumper, etc.

+

+- [[arduino-dat]]

+

+- [[LGT8F328-DAT]] - [[LGT8F328-SSOP20-dat]] - [[LGT-dat]]

+

+- [[]]

+

+

+

+- [[EYGC4-dat]] pins

+

+- D7_RX

+- D9_TX

+- D2_INT

+- BT_STATUS - BT6

+- D11_WAKEUP

+- GPIO0

+- GPIO1

+

+

+

+

+## Applications, category, tags, etc.

+

+## Demo Code and Video

+

+## ref

+

+- [[]]

+

+- legacy wiki page

+

+

+# EYGC4-dat

+

+EYGC40 is a low-power Bluetooth (BLE) module based on a cost-effective System-on-Chip (SoC). It supports Bluetooth 4.0.

+

+## Overview

+

+- Voltage range: 2.0 V to 3.6 V (typical 3.3 V)

+- Frequency range: 2402 MHz to 2480 MHz (programmable)

+- Modulation: GFSK

+- Data rate: 1 Mbps

+- Operating temperature: -30 °C to 85 °C

+- Dimensions: 18.8 mm × 15.1 mm

+- Antenna impedance: 50 Ω

+- Antenna: PCB antenna (on-board)

+

+## Applications

+

+- 2.4 GHz low-power Bluetooth systems

+- Mobile phone accessories

+- Sports and leisure equipment

+- Consumer electronics

+- Human-computer interaction devices (keyboard, mouse, remote)

+- USB transceiver dongles

+- Healthcare and medical devices

+

+## Electrical and RF Specifications

+

+| Parameter | Value |

+|---|---:|

+| Supply voltage | 2.0 V – 3.6 V (typical 3.3 V) |

+| Operating frequency | 2402 MHz – 2480 MHz (programmable) |

+| Frequency accuracy | ±20 ppm |

+| Modulation | GFSK |

+| Data rate | 1 Mbps |

+| Max TX power | 7.9 dBm (programmable) |

+| RX sensitivity | -94 dBm |

+| Sleep current | 8 μA |

+| RX current | 12 mA |

+| TX current | 20 mA (at 7.9 dBm) |

+| Typical range | 100 m (open space) |

+| Operating temperature | -30 °C – 85 °C |

+| Size | 18.8 mm × 15.1 mm |

+

+## Pin Definitions

+

+| No. | Pin | Type | Description |

+|---:|---|---|---|

+| 1 | VCC | Power | Power input, 2.0 V – 3.6 V (typ. 3.3 V) |

+| 2 | GND | Ground | Connect to GND |

+| 3 | UART_RX | Digital I/O | UART receive |

+| 4 | UART_TX | Digital I/O | UART transmit |

+| 5 | OUTPUT_IND | Digital I/O | Data output indicator: outputs a 460 μs low pulse before UART data is sent |

+| 6 | CONN_IND | Digital I/O | Connection status indicator: HIGH after reset, LOW when a BLE connection is established |

+| 7 | WAKEUP | Digital I/O | WAKE pin: in low-power mode pull this low to enable UART communication (see note) |

+| 8 | GPIO0 | Digital I/O | Configurable as input or output |

+| 9 | GPIO1 | Digital I/O | Configurable as input or output |

+| 10 | GND | Ground | Connect to GND |

+| 11 | GND | Ground | Connect to GND |

+

+## Schematic

+

+

+

+

+

+

+

+

+## Indicator & Wake Behavior

+

+- After reset, the module's `CONN_IND` pin outputs a HIGH level. When a Bluetooth connection is established, `CONN_IND` goes LOW.

+- After a connection is established, when the module receives a BLE data packet, `OUTPUT_IND` will first output a 460 μs low pulse to notify the external MCU that data will be sent, and then the module transmits the data over UART.

+- In low-power mode the external MCU must pull `WAKEUP` low for at least 10 μs to wake the BLE module before sending UART data.

+

+

+## AT Commands

+

+Notes:

+- All commands and responses use ASCII.

+- Each command must end with <CR><LF> (carriage return + line feed) unless otherwise noted.

+- If a command is accepted the module responds with the appropriate reply (OK or the requested data); otherwise it responds with: ERROR<CR><LF>.

+

+1) Mode switch (command/transparent modes)

+

+- Default after power-up: transparent (data) mode. To enter command mode after power-up, send: AT+MODE=0<CR><LF>.

+

+Examples:

+- Query current mode: Send: AT+MODE<CR>

+ - Response: +MODE:<para><CR><LF>

+ - para = 0 (command mode) or 1 (transparent/data mode)

+- Query supported parameters: Send: AT+MODE?<CR>

+ - Response: +MODE:<para><CR><LF>

+ - para = 0,1

+- Set mode: Send: AT+MODE=<para><CR>

+ - para = 0 or 1

+ - OK<CR><LF> on success; ERROR<CR><LF> on failure

+

+2) Advertising (scan) enable

+

+- Default: advertising enabled.

+

+Examples:

+- Query current advertising state: Send: AT+SCAN<CR>

+ - Response: +SCAN:<para><CR><LF>

+ - para = 0 (advertising disabled) or 1 (advertising enabled)

+- Query supported parameters: Send: AT+SCAN?<CR>

+ - Response: +SCAN:0,1<CR><LF>

+ - (0 = disable advertising; 1 = enable advertising). This setting only applies when the module is not connected.

+- Set advertising state: Send: AT+SCAN=<para><CR>

+ - para = 0 or 1

+ - OK<CR><LF> on success; ERROR<CR><LF> on failure

+

+3) Connection interval (link interval)

+

+- Supported range: 10 ms to 2000 ms, in 10 ms increments. Changes take effect immediately.

+

+Examples:

+- Query current interval: Send: AT+LINKINV<CR>

+ - Response: +LINKINV:<para><CR><LF> (current interval in ms)

+- Query supported parameters: Send: AT+LINKINV?<CR>

+ - Response: +LINKINV:<para><CR><LF>

+- Set interval: Send: AT+LINKINV=<para><CR>

+ - para = multiple of 10 (ms)

+ - OK<CR><LF> on success; ERROR<CR><LF> on failure

+

+4) UART baud rate

+

+- Default: 9600, 8N1.

+- Supported baud rates: 9600, 19200, 38400, 57600, 115200.

+

+Examples:

+- Query current baud: Send: AT+UART<CR>

+ - Response: +UART:<para><CR><LF> (current baud)

+- Query supported rates: Send: AT+UART?<CR>

+ - Response: +UART:<para><CR><LF>

+- Set baud: Send: AT+UART=<para><CR>

+ - para = 9600,19200,38400,57600,115200

+ - OK<CR><LF> on success; ERROR<CR><LF> on failure

+

+5) TX power configuration

+

+- Ten levels available:

+

+| Level | TX Power (dBm) |

+|---:|---:|

+| 0 | -19.5 dBm |

+| 1 | -16.0 dBm |

+| 2 | -13.3 dBm |

+| 3 | -9.6 dBm |

+| 4 | -5.0 dBm |

+| 5 | -3.1 dBm |

+| 6 | 0.0 dBm |

+| 7 | 3.3 dBm |

+| 8 | 6.3 dBm |

+| 9 | 7.9 dBm (default) |

+

+Examples:

+- Query current power: Send: AT+RFPW<CR>

+ - Response: +RFPW:<para><CR><LF>

+- Query supported values: Send: AT+RFPW?<CR>

+ - Response: +RFPW:<para><CR><LF>

+- Set power level: Send: AT+RFPW=<para><CR>

+ - para = 0..9

+ - OK<CR><LF> on success; ERROR<CR><LF> on failure

+

+6) Module name

+

+- Default name: GCBT40. Maximum length: 18 bytes. Changes take effect after reboot.

+

+Examples:

+- Query name: Send: AT+NAME<CR>

+ - Response: +NAME:<para><CR><LF>

+- Set name: Send: AT+NAME=<para><CR>

+ - para = new name (up to 18 bytes)

+ - OK<CR><LF> on success; ERROR<CR><LF> on failure

+

+7) Advertising interval

+

+- Supported values: 100, 200, 500, 1000, 2000 (ms). Range: 100 ms to 2000 ms. Changes while advertising take effect immediately.

+

+Examples:

+- Query current advertising interval: Send: AT+ADVT<CR>

+ - Response: +ADVT:<para><CR><LF>

+- Query supported values: Send: AT+ADVT?<CR>

+ - Response: +ADVT:<para><CR><LF>

+- Set advertising interval: Send: AT+ADVT=<para><CR>

+ - para = 100,200,500,1000,2000

+ - OK<CR><LF> on success; ERROR<CR><LF> on failure

+

+8) Query MAC address

+

+- Send: AT+GMAC<CR>

+ - Response: +GMAC:<para><CR><LF> (MAC address)

+

+9) Low-power (standby) modes

+

+- Default: normal mode.

+

+Examples:

+- Query standby mode: Send: AT+STBY<CR>

+ - Response: +MODE:<para><CR><LF>

+ - 0 = normal mode

+ - 1 = low-power mode

+- Query supported parameters: Send: AT+STBY?<CR>

+ - Response: +MODE:<para><CR><LF> (para = 0,1,2)

+- Set standby mode: Send: AT+STBY=<para><CR>

+ - para = 0,1,2

+ - Mode 2 = deep sleep: after wake the module auto-resets and mode returns to the previous 0 or 1

+ - OK<CR><LF> on success; ERROR<CR><LF> on failure

+

+10) RF test (single-carrier transmit)

+

+- Send: AT+TEST=P,C<CR>

+ - P = TX power level (0..9)

+ - C = channel index; frequency = 2402 + C*2 MHz

+ - OK<CR><LF> on success; ERROR<CR><LF> on failure

+

+11) Restore factory defaults

+

+- Send: AT+DEFA<CR>

+ - Response: OK<CR><LF>

+ - The module will automatically reboot after this command

+

+

+## BLE Services and Characteristics (Commands)

+

+Below is a concise, developer-friendly summary of the module's BLE services and characteristics. All UUIDs are 16-bit.

+

+### 1. Data Services (Service UUID: 0xFF10)

+

+| Characteristic | UUID | Properties | Length | Function |

+|---|---:|---|---:|---|

+| Bluetooth data channel | 0xFF11 | Write | 20 bytes | Data written here is forwarded to the UART output |

+| UART data channel | 0xFF12 | Notify | 20 bytes | Data from UART is sent to the connected mobile device via notifications |

+

+### 2. Configuration Service (Service UUID: 0xFF20)

+

+| Characteristic | UUID | Properties | Function / Notes |

+|---|---:|---|---|

+| Connection interval config | 0xFF21 | Write | Configure connection interval; supported in multiples of 10 ms. Write the corresponding value to set. On success the status channel returns OK; otherwise ERROR. Query: send '=' to read current config (reply via status channel). Send '?' to query supported values. |

+| Rename module | 0xFF22 | Write | Set module name (max 18 characters). Reboot required to apply. |

+| UART baud rate config | 0xFF23 | Write | Supported baud rates: 9600, 19200, 38400, 57600, 115200. Query: send '=' to read current value; send '?' to read supported values. |

+| TX power config | 0xFF24 | Write | Power levels 0–9 (see table below). Default is level 9 (7.9 dBm). Query: '=' current, '?' supported. |

+| Low-power mode enable | 0xFF25 | Write | 0 = normal mode, 1 = low-power mode. Query supported values with '?'. |

+| Advertising/connection interval | 0xFF26 | Write | Supports multiples of 10 ms. Write value to set. Query: '=' current, '?' supported. |

+| Status reply (operation result) | 0xFF2F | Notify | Returns status for configuration operations. Query replies return the requested data; config operations return OK or ERROR. |

+

+TX power levels mapping (level -> dBm):

+

+| Level | TX Power (dBm) |

+|---:|---:|

+| 0 | -19.5 dBm |

+| 1 | -16.0 dBm |

+| 2 | -13.3 dBm |

+| 3 | -9.6 dBm |

+| 4 | -5.0 dBm |

+| 5 | -3.1 dBm |

+| 6 | 0.0 dBm |

+| 7 | 3.3 dBm |

+| 8 | 6.3 dBm |

+| 9 | 7.9 dBm (default) |

+

+### 3. GPIO Control Service (Service UUID: 0xFF50)

+

+| Characteristic | UUID | Properties | Function |

+|---|---:|---|---|

+| GPIO0 output control | 0xFF51 | Write | Write 0 or 1 to set GPIO0 output |

+| GPIO0 mode control | 0xFF52 | Write | 0 = input mode, 1 = output mode |

+| GPIO0 status | 0xFF53 | Read | Read GPIO0 state: 0 = low, 1 = high |

+| GPIO1 output control | 0xFF54 | Write | Write 0 or 1 to set GPIO1 output |

+| GPIO1 mode control | 0xFF55 | Write | 0 = input mode, 1 = output mode |

+| GPIO1 status | 0xFF56 | Read | Read GPIO1 state: 0 = low, 1 = high |

+| Data storage | 0xFF58 | Read/Write | Read or write up to 18 bytes for persistent storage (retained after power loss) |

+| GPIO status notification | 0xFF5F | Notify | Notifies external device of GPIO status changes |

+

+## 4. Device Information Service (Service UUID: 0x180A)

+

+| Characteristic | UUID | Properties | Length | Default / Notes |

+|---|---:|---|---:|---|

+| Module MAC address | 0x2A23 | Read | 8 bytes | Default: 0000xxxxxxxxxxxx (hex); physical address of the module |

+| Module model | 0x2A24 | Read | 15 bytes | Default: EYGC40 |

+| Software version | 0x2A28 | Read | 4 bytes | Software/firmware version |

+| Manufacturer | 0x2A29 | Read | 10 bytes | Default: "BLE Module" |

+

+

+## Notes and Usage Tips

+

+- Use the `OUTPUT_IND` pulse to synchronize reads from UART if the host MCU sleeps or polls.

+- Before sending UART data while the module is in low-power mode, pull `WAKEUP` low for at least 10 μs.

+- After changing configuration values that require a reboot (for example the module name), cycle power or issue a software reboot to apply changes.

+- [[LGT8F328-DAT]] - [[LGT8F328-SSOP20-dat]] - [[LGT8F328-SDK-DAT]]

+

+

+- [[UART-dat]] - [[GPIO-dat]] - [[PWM-dat]] - [[ADC-dat]] - [[DAC-dat]]

+

+# LGT8F328-SDK-DAT

+

+

+

+## Sketch uploads By Arduino IDE

+- Pre-loaded bootloder. Just select corresponding board to upload sketch, refer to bootloader sketch below

+- Programming pin port same as FTDI [[FT232-dat]], same as arduino pro mini

+- A backup method for without DTR, just hold down RESET button when "compiling", then release when "uploading".

+

+

+

+

+

+

+## bootloader

+

+### nullab board

+

+- most compatible, please use this one

+- Nullab Nano/ Maker Nano

+- install by this - https://nulllab.coding.net/p/lgt/d/nulllab_lgt_arduino/git/raw/master/package_nulllab_boards_index_zh.json

+

+

+### old 1

+

+https://github.com/LGTMCU/Larduino_HSP

+Installation:

+

+- Unzip master.zip

+- Copy the [hardware] directory to Arduino's sketchbook directory (see below to find out where it normally resides)

+- Restart Arduino, you will see new board from [Tools]->[Board] menu.

+

+### old 2 bootloader

+

+- Better not used for experiment, your often daily programming learning or testing, although no problem, but if unexpected error cause the board bricked, you need special programmer to re-programme the bootloader.

+- Good to migrate to a low cost board instead of original expensive board.

+- Same way to upload sketch as pro mini, notice to choose the board

+ - 8F328P - original IC bootloader, please use this one

+ - 8F328D - compatible, can also upload code, but don't know if any unknow error.

+ - Pro mini - also can upload, but active very wired

+

+

+## Chip Note

+

+- crystal is not soldered, it can work without crystal, unlike [[atmega328]]

+

+## Programmer

+

+- arduino UNO can pretend as a chip programmer

+- please contact us if you need to order original programmer

+

+

+## ref

+

+- [[LGT8F328-dat]] - [[LGT-dat]]

+

+# LGT8F328-SSOP20-dat

+

+

+- [[LGT8F328-DAT]] - [[LGT8F328-SSOP20-dat]] - [[LGT-dat]]

+

+- [[]]

+

+

+## LGT8F328P-SSOP20

+

+

+

+

+

+

+[[arduino-dat]] compatible design

+

+

+

+

+

+

+## ref

+

+- [[LGT-dat]]

+

+

+

+

+

+- [[LGT8F328-dat]] - [[LGT-dat]]