STM32F103C8T6 Configuration Using CubeMX + HAL Library

Open STM32CubeMX and select STM32F103C8T6.

Enable two UART interfaces:

USART1

  • PA9 → USART1_TX
  • PA10 → USART1_RX

USART2

  • PA2 → USART2_TX
  • PA3 → USART2_RX

Select Asynchronous mode and enable UART interrupts.

Baud rate settings:

  • USART1: 256000 bps
  • USART2: 115200 bps

Note: Ensure the baud rate settings match the radar and voice module requirements.


UART Data Processing Rd-03D UART Data

The Rd-03D module communicates with external devices via UART (TTL level).

  • Default baud rate: 256000 bps
  • Data format: 1 stop bit, no parity

The radar outputs detected target information, including:

  • X coordinate
  • Y coordinate
  • Target velocity

By default, the radar operates in single-target detection mode and must be switched to multi-target detection mode for this application.


Data Frame Format

Example data frame:

AA FF 03 00 0E 03 B1 86 10 00 68 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 CC 

AA FF 03 00 0E 03 B1 86 10 00 68 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 CC


  • Red section: Target 1 information
  • Blue section: Target 2 information
  • Green section: Target 3 information

In this demo, only presence detection is required, so it is sufficient to check whether valid target data exists in the corresponding frame.

6. VC-02 UART Data The VC-02 UART protocol is user-defined. Development resources and documentation can be found on the VC series official website:

https://docs.ai-thinker.com/voice_module 

Below is a custom-defined UART protocol and voice command table. All UART outputs are in hexadecimal format.

7. STM32 Data Processing Logic

This implementation uses flag-based logic to process data, preventing repeated voice announcements when radar data is updated too frequently.

uint8_t RX_BUF[64] = {0};          // Receive buffer

uint8_t RX_count = 0;              // Buffer counter

uint8_t RX_temp;                   // Temporary received byte

 

uint8_t Radar_1 = 0;               // Target 1 flag

uint8_t Radar_2 = 0;               // Target 2 flag

uint8_t Radar_3 = 0;               // Target 3 flag

 

uint8_t Speaker_1 = 0;             // Voice announcement flag for target 1

uint8_t Speaker_2 = 0;             // Voice announcement flag for target 2

uint8_t Speaker_3 = 0;             // Voice announcement flag for target 3

 

uint8_t Single_Target_Detection_CMD[] = {

    0xFD,0xFC,0xFB,0xFA,0x02,0x00,0x80,0x00,0x04,0x03,0x02,0x01

}; // Single-target detection mode command (detects only one target)

 

uint8_t Multi_Target_Detection_CMD[] = {

    0xFD,0xFC,0xFB,0xFA,0x02,0x00,0x90,0x00,0x04,0x03,0x02,0x01

}; // Multi-target detection mode command (detects multiple targets)

 

uint8_t SpeakerCMD_0[5] = {0x5A,0x00,0x00,0x00,0x00}; // No-target voice announcement command

uint8_t SpeakerCMD_1[5] = {0x5A,0x00,0x00,0x00,0x01}; // One-target voice announcement command

uint8_t SpeakerCMD_2[5] = {0x5A,0x00,0x00,0x00,0x02}; // Two-target voice announcement command

uint8_t SpeakerCMD_3[5] = {0x5A,0x00,0x00,0x00,0x03}; // Three-target voice announcement command

 

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) // Callback function, called when one frame of data is received

{

    if (huart == &huart2)...
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