I used ADS1299 to collect 10HZ, 100MV square wave signal. After a while, my host computer showed a mutation. I used a logic analyzer to collect the SPI pin level and found that the output data of the ADS1299 was repeated. As shown below.
The channel data after the second C0 00 00 is basically the same as the normal channel data. The data output by ADS1299 is wrong. Why does this happen?
HI,
I really appreciate receiving your reply.
Maybe there is something wrong with my narrative, so that you cannot understand the question I am asking.
My problem is that in the picture I posted above, there is some problem with the data output by the ADS1299, causing my data to mutate, such as the picture below me.
I found the electrical signals collected by the logic analyzer corresponding to the mutation data. I found that the misalignment of the output data of the ADS1299 was the main reason for my data mutation. The correct data format output by ADS1299 is: C0 00 00 (24 status bits) + the first channel (24 bits) + ........ + the eighth channel (24 bits), the wrong data format I encountered Yes: C0 00 00 (24 status bits) +47 C0 00+ 00 (24 status bits appear again) and the subsequent channel value is correct. But the correct bits of the entire data are shuffled.
The above is the problem I encountered.
Below is my register configuration.
CONFIG1 0x94
CONFIG2 0Xc0
CONFIG3 0XE0
LOFF: Lead-Off Control Register 0X00
CH1SET 0X00
CH2SET 0X00
CH3SET (My main test channel) 0X00
CH4SET（EEG test channel） 0X60
CH5SET （EEG test channel） 0X60
CH6SET 0X00
CH7SET 0X00
CH8SET 0X00
Other register configurations are default.
My ADS1299 is initialized by setting START to high to start the conversion.
