Reference
Last revision 2026/01/21
Use Guide for the Master Computer
Connect the sensor to the USB-to-serial port module.
Click to download the master computer of SEN0344 Heart Rate and Oximeter Sensor
After decompressing, run SEN0344.exe, select the serial port and baud rate and click to start the measurement.
Communication Protocol Description
The communication interface uses UART
| Transmit | From Adevice to Bdevice | ||||
|---|---|---|---|---|---|
| Functions | Bdevice Addess | Function Code | Register Address | Register Number | CRC Check |
| Get the Heart Rate and Blood Oxygen Data | 0×20 | 0×03/Read | 0×00 0×06 | 0×00 0×04 | CRC_h CRC_l |
| Get the Temperature | 0×20 | 0×03 | 0×00 0×0A | 0×00 0×01 | CRC_h CRC_l |
| Receive | Response from Bdevice | ||||
| Functions | Bdevice Addess | Function Code | Valid Bytes | Data | CRC Check |
| Get the Heart Rate and Blood Oxygen Data | 0×20 | 0×03 | 0×08 | SPO2(1byte) xx(1byte reseved) Heartbeat(4byte) xx(2byte reserved) | CRC_h CRC_l |
| Get the Temperature | 0×20 | 0×03 | 0×02 | Temp_h Temp_l | CRC_h CRC_l |
| Set the Sensor | Transmit From Adevice | ||||
|---|---|---|---|---|---|
| Functions | Bdevice Addess | Function Code | Register Address | Register Number | CRC Check |
| Start to Collet Data | 0×20 | 0×06 | 0×00 0×10 | 0×00 0×01 | CRC_h CRC_l |
| Stop Colleting Data | 0×20 | 0×06 | 0×00 0×10 | 0×00 0×02 | CRC_h CRC_l |
| Set the Sensor | Response From Bdevice | ||||
| Functions | Bdevice Addess | Function Code | Valid Bytes | Data | CRC Check |
| Start to Collet Data | 0×20 | 0×06 | 0×00 0×10 | 0×00 0×01 | CRC_h CRC_l |
| Stop Colleting Data | 0×20 | 0×06 | 0×00 0×10 | 0×00 0×02 | CRC_h CRC_l |
CRC check
static uint16_t calculate_CRC(uint8_t *data, uint8_t len)
{
uint16_t crc = 0xFFFF;
for( uint8_t pos = 0; pos < len; pos++)
{
crc ^= (uint16_t)data[ pos ];
for(uint8_t i = 8; i != 0; i--)
{
if((crc & 0x0001) != 0){
crc >>= 1;
crc ^= 0xA001;
}else{
crc >>= 1;
}
}
}
crc = ((crc & 0x00FF) << 8) | ((crc & 0xFF00) >> 8);
return crc;
}
API Description
/*!
* @brief Get heart rate and oxygen saturation and store them into the structure sHeartbeatSPO2
* @param NULL
* @return No value returned
*/
void getHeartbeatSPO2();
/*!
* @brief Get the sensor board temp
* @param NULL
* @return Temp (unit: ℃)
*/
float getTemperature_C();
/*!
* @brief Sensor starts to collect data
* @param NULL
* @return NULL
*/
void sensorStartCollect();
/*!
* @brief Sensor stops collecting data
* @param NULL
* @return NULL
*/
void sensorEndCollect();
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