vamoosebbf / sp_bt

蓝牙串口透传模块在 K210 上的使用

SP_BT Module User Guide

中文

Directory Structure

Directory	Description
doc	Reference documentation
img	Images
script	Maixpy script example
src	C program example based on the standalone sdk

Introduce

SP_BT is a Bluetooth serial transmission module with ultra-low power and high reliability.

• Bluetooth version：Support BLE 5.0 (compatible with BLE4.0, BLE4.2)

• Default Baud Rate：9600

  See Specification for more information

Pin figure

Mode of connection

MCU:FUN(IO)	SP_BT
UART:TXD(IO_7)	RXD
USRT:RXD(IO_6)	TXD
1.8-3.3V	3.3V
GND	GND

MCU configuration

IO port configuration

Configure IO port corresponding to MCU as UART function pin.

• C

  // set uart rx/tx func to io_6/7
  fpioa_set_function(6, FUNC_UART1_RX + UART_NUM * 2);
  fpioa_set_function(7, FUNC_UART1_TX + UART_NUM * 2);

• MaixPy

  # set uart rx/tx func to io_6/7
  fm.register(6,fm.fpioa.UART1_RX)
  fm.register(7,fm.fpioa.UART1_TX)

UART initialization

The UART initialization baud rate must be consistent with the SP_BT baud rate. The AT instruction can be used to change the Baud rate of SP_BT, which defaults to 9600.

• C

  uart_init(UART_DEVICE_1);
  uart_configure(UART_DEVICE_1, 9600, 8, UART_STOP_1, UART_PARITY_NONE);

• MaixPy

  uart = UART(UART.UART1,9600,8,1,0,timeout=1000, read_buf_len=4096)

SP_BT configuration

AT instruction list

Order	Description
AT+BAUD<Param>	Baud rates (0-6 represent different baud rates)
AT+NAME<Param>	Boardcast name
AT+SLEEP<param>	Sleep

See JDY-23-V2.1.pdf for more information

AT instruction usage

• Process

  1. Send AT instruction
  2. Receive the reply
  3. Determines whether the setup was successful

• C

  //change the name of sp_bt module to MAIXCUBE
  uart_send_data(UART_NUM, "AT+NAMEMAIXCUBE\r\n", strlen("AT+NAMEMAIXCUBE\r\n")); //send AT order
  msleep(100);
  ret = uart_receive_data(UART_NUM, rcv_buf, sizeof(rcv_buf)); //receive response
  if(ret != 0 && strstr(rcv_buf, "OK"))
  {
     printk(LOG_COLOR_W "set name success!\r\n");
  }
  
  // get the name of sp_bt module
  uart_send_data(UART_NUM, "AT+NAME\r\n", strlen("AT+NAME\r\n")); //send AT order
  msleep(100);
  ret = uart_receive_data(UART_NUM, rcv_buf, sizeof(rcv_buf)); //receive response
  if(ret != 0 && strstr(rcv_buf, "NAME"))
  {
     printk(LOG_COLOR_W "get name success!\r\n");
  }

• MaixPy

  #change the name of sp_bt module to MAIXCUBE
  uart.write("AT+NAMEMAIXCUBE\r\n") #send AT order
  time.sleep_ms(100)
  read_data = uart.read() #receive response
  if read_data:
      read_str = read_data.decode('utf-8')
      count = read_str.count("OK")
      if count != 0:
          uart.write("set name success\r\n")
  
  # get the name of sp_bt module
  uart.write("AT+NAME\r\n") #send AT order
  time.sleep_ms(100)
  read_data = uart.read() #receive response
  if read_data:
      read_str = read_data.decode('utf-8')
      count = read_str.count("NAME")
      if count != 0:
          uart.write("get name success\r\n")

Note that you must add \r\n after sending AT instruction

Result

Using BLE Utility to connect the device to do the send and receive test results are as follows:

Runtime environments

Language	Board	SDK/Firmware version
C	MaixCube	kendryte-standalone-sdk v0.5.6
MaixPy	MaixCube	maixpy v0.5.1

LICENSE

See LICENSE fil.

Othre information

Version	Editor
v0.1	vamoosebbf