BME680 always results in BME680_W_NO_NEW_DATA

[mayor]

Hi, I am integrating a BME680 with a TI CC1312 microcontroller. I can communicate fine with the sensor over I2C, from all appearances, but any time I am trying to take readings (even from the self-test from https://github.com/BoschSensortec/BME680_driver), I am getting no new data from the sensor. I have also tried a couple different units, getting the same results.

Here's some calibration info:

par_h1	unsigned short	717	
par_h2	unsigned short	1022	
par_h3	char	0 '\x00'	
par_h4	char	45 '-'	
par_h5	char	20 '\x14'	
par_h6	unsigned char	120 'x'	
par_h7	char	-100 '\x9c'		
par_gh1	char	-47 '\xd1'		
par_gh2	short	-11597	
par_gh3	char	18 '\x12'	
par_t1	unsigned short	26045	
par_t2	short	26419	
par_t3	char	3 '\x03'	
par_p1	unsigned short	36759	
par_p2	short	-10411		
par_p3	char	88 'X'		
par_p4	short	7301	
par_p5	short	-50		
par_p6	char	30 '\x1e'	
par_p7	char	51 '3'		
par_p8	short	-3768	
par_p9	short	-2137		
par_p10	unsigned char	30 '\x1e'	
t_fine	int	0	
res_heat_range	unsigned char	1 '\x01'	
res_heat_val	char	47 '/'		
range_sw_err	char	-1 '\xff'	

 And this is what comes out from the sensor when trying to read data:

[0]	unsigned char	0 '\x00'	
[1]	unsigned char	0 '\x00'	
[2]	unsigned char	128 '\x80'
[3]	unsigned char	0 '\x00'
[4]	unsigned char	0 '\x00'
[5]	unsigned char	128 '\x80'
[6]	unsigned char	0 '\x00'	
[7]	unsigned char	0 '\x00'
[8]	unsigned char	128 '\x80'
[9]	unsigned char	0 '\x00'
[10]	unsigned char	128 '\x80'
[11]	unsigned char	0 '\x00'
[12]	unsigned char	0 '\x00'
[13]	unsigned char	0 '\x00'
[14]	unsigned char	4 '\x04'

Any help appreciated!

[Vincent]

Please share your code implementation here. 

From the register value you posted,  the measurement of sensor is not really happen,  all result is 0.  

[mayor]

Hi Vincent,

well, my code is essentially the self-test code from the Bosh GitHub.

I have created read/write i2c functions as well as delay, which appear to be working (I can read and write to registers, see calibration registers).

int8_t BME680::i2c_read(uint8_t reg_addr, uint8_t *reg_data, uint16_t len) {
    uint8_t writeBuf[1] = {reg_addr};
    i2cTransaction.readCount = len;
    i2cTransaction.readBuf = reg_data;
    i2cTransaction.writeCount = 1;
    i2cTransaction.writeBuf = writeBuf;
    bool status = I2C_transfer(i2c, &i2cTransaction);
    return !status;
}

int8_t BME680::i2c_write(uint8_t reg_addr, uint8_t *reg_data, uint16_t len) {
    i2cTransaction.readCount  = 0;
    i2cTransaction.writeCount = len;
    i2cTransaction.writeBuf = reg_data;
    bool status = I2C_transfer(i2c, &i2cTransaction);
    return !status;
}

void BME680::delay(uint32_t delayMs) {
    Task_sleep(delayMs*100); //fixme, must take into account actual duration of a tick (10us here)
}

[Vincent]

Then in this case,  can you try to read out whole register map of BME680 and provide here?  

[mayor]

Hi,

here's what I see (same order as they appear in the docs):

0xd0: 97
0x72: 0
0x74: 100
0x75: 0
0x50: 0
0x51: 0
0x52: 0
0x53: 0
0x54: 114
0x55: 0
0x56: 0
0x57: 0
0x58: 0
0x59: 0
0x5a: 0
0x5b: 0
0x5c: 0
0x5d: 0
0x5e: 0
0x5f: 0
0x60: 0
0x61: 0
0x62: 0
0x63: 0
0x64: 0
0x65: 0
0x66: 0
0x67: 0
0x68: 0
0x69: 0
0x6a: 0
0x6b: 0
0x6c: 0
0x6d: 0
0x70: 0
0x71: 0
0x1f: 128
0x20: 0
0x21: 0
0x22: 128
0x23: 0
0x24: 0
0x25: 128
0x26: 0
0x2a: 0
0x2b: 4
0x1d: 0