Waveshare BME280 - Data Acquisition Functions; Communication Function Details

BME280 Environmental Sensor
And then transfer function pointers of these functions to bem280_dev structure.
The function to read BME280 data is:
int8_t stream_sensor_data_forced_mode(struct bme280_dev *dev)
int8_t stream_sensor_data_normal_mode(struct bme280_dev *dev)
Print function:
void print_sensor_data(struct bme280_data *comp_data)
The read/write function of I2C and SPI:
void user_delay_ms(uint32_t period)
{
/*
* Return control or wait,
* for a period amount of milliseconds
*/
}
int8_t user_spi_read(uint8_t dev_id, uint8_t reg_addr, uint8_t *reg_data,
uint16_t len)
{
int8_t rslt = 0; /* Return 0 for Success, non-zero for failure */
/*
* The parameter dev_id can be used as a variable to select which Chip
Select pin has
* to be set low to activate the relevant device on the SPI bus
*/
/*
* Data on the bus should be like
* |----------------+---------------------+-------------|
* | MOSI | MISO | Chip Select |
* |----------------+---------------------|-------------|
* | (don't care) | (don't care) | HIGH |
* | (reg_addr) | (don't care) | LOW |
* | (don't care) | (reg_data[0]) | LOW |
* | (....) | (....) | LOW |
* | (don't care) | (reg_data[len - 1]) | LOW |
* | (don't care) | (don't care) | HIGH |