BME688 no new data found

[julio_cf98]

Hi, I'm using BME688 in a custom board with nRF52840 microcontroller running Zephyr RTOS. I modified the common.c file from bme68x API and checked the I2C transactions with a logic analizer to verify that read/write procedure is in the right format (page 46 in the datasheet).

Here are the i2c and delay functions that I edited from the original common.c file available in GitHub. i2c_dev is a structure pointer to the i2c peripheral used by Zephyr.

BME68X_INTF_RET_TYPE bme68x_i2c_read(uint8_t reg_addr, uint8_t *reg_data, uint32_t len, void *intf_ptr)
{
    return i2c_burst_read(i2c_dev, dev_addr, reg_addr, reg_data, len);
}

BME68X_INTF_RET_TYPE bme68x_i2c_write(uint8_t reg_addr, const uint8_t *reg_data, uint32_t len, void *intf_ptr)
{
    uint8_t tx_buf[len + 1];
    tx_buf[0] = reg_addr;
    memcpy(tx_buf + 1, reg_data, len);
    return i2c_write(i2c_dev, tx_buf , len + 1, dev_addr);
}

void bme68x_delay_us(uint32_t period, void *intf_ptr)
{
    k_usleep(period);
}

Here is a read timming example to get the chip id. Burst read also works fine.

 BME688 chip id I2C read.

Here is a burst write example. As in datasheet's page 46,  there is no auto-increment, as you can see the register address increments by 1: 0x71, 0x72, ..., 0x75.

BME688 multiple byte write.

The problem: 

When I run the self-check, this message appears:

API name [bme68x_selftest_check] Warning [2] : No new data found

And when I try the forced mode example, I always get this output :

API name [bme68x_init] OK [0]
API name [bme68x_set_conf] OK [0]
API name [bme68x_set_heatr_conf]OK [0]
Sample, TimeStamp(ms), Temperature(deg C), Pressure(Pa), Humidity(%), Gas resistance(ohm), Status
API name [bme68x_set_op_mode] OK [0]
API name [bme68x_get_data] Warning [2] : No new data found
API name [bme68x_set_op_mode] OK [0]
API name [bme68x_get_data] OK [0]
1, 3852, 0, 1107730122, 1200501, 1120403456, 0x80
API name [bme68x_set_op_mode] OK [0]
API name [bme68x_get_data] OK [0]
2, 4010, 0, 1107730122, 1200501, 1120403456, 0x80
API name [bme68x_set_op_mode] OK [0]
API name [bme68x_get_data] OK [0]
3, 4168, 0, 1107730122, 1200501, 1120403456, 0x80
API name [bme68x_set_op_mode] OK [0]
API name [bme68x_get_data] OK [0]
4, 4326, 0, 1107730122, 1200501, 1120403456, 0x80
API name [bme68x_set_op_mode] OK [0]
API name [bme68x_get_data] OK [0]
5, 4485, 0, 1107730122, 1200501, 1120403456, 0x80
(...)

This is how it looks like at the logic analizer:

I'm not using the FPU and I just changed the line time_ms = coines_get_millis(); to:

time_ms = k_uptime_get_32();

There are other posts with similar problems but no one seems to resolve it. What can be wrong or missing?

[BSTRobin]

Hi julio_cf98,

There was attached example code on STM32 for your reference.