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About Frankie
since
05-22-2019
11-29-2022
Frankie
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11-23-2022
08:02 AM
I would like to get the timestmap for every accel and gyro sample. The ODR of accel and gyro is 100Hz and data ready interrupt is enabled and mapped to interrupt pin. The accel and gyro will have a timestamp from kernel while received a data ready interrupt signal from BMI085. Can I use this timestamp from kernel instend of the sensor time from register 0x18-0x1A?
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08-28-2019
04:37 AM
Where can I get more details about register 0x5B and 0x5C? These two registers are not mentioned in datasheet. And why only 4 bit for register 0x5B(asic_lsb = ((index / 2) & 0x0F);) and shift 4 bit right to get msb for register 0x5C? I try to get the content of register 0x5b and 0x5c after config file is downaloaded and it showed 0x10(register 0x5C) and 0x00(register 0x5B). The setting of dev->read_write_len is 32 and the length of BMA4_CONFIG_STREAM_SIZE is 6144 bytes, the last write/index should be 6144-32=6112(0x17E0). So register 0x5C should be (6112/2 >>4)=0xBF and register0x5B= (6112/2)&0x0f=0x0? Obviously, the content of registetr 0x5B and ox5C are not what I expected.
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05-30-2019
09:54 AM
thanks, but it looks like the number of samples for slope interrupt engine are not taken into account in the table of BW=1KHz
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05-22-2019
04:32 AM
Am i correct for the following calculation? In order to suppress false triggers, the interrupt is only generated (cleared) if a certain number N of consecutive slope data points is larger (smaller) than the slope threshold given by (0x28) slope_th. This number is set by the (0x27) slope_dur bits. It is N = (0x27) slope_dur + 1 for (0x27). In EDT the duration of the wake-up phase depends on the number of samples required by the enabled interrupt engines. e.g. slope_dur=1, bandwidth=500Hz(tut=1ms), sleep time=6ms tactive = tut + tw,up1 - 0.9 ms (or tactive = tut + tw,up2 - 0.9 ms) N=slope_dur+1=2, so tactive=1ms*3+1.4ms(typical value)-0.9ms=3.5ms? and the estimated current will be (6ms*1.4uA+3.5ms*130uA)/(6ms+3.5ms)?
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