Tool/software:
Hi,
I use STM32 to control ADS1299EVM. I want to use the internal square wave test function to test it. I successfully get the signal, but the waveform does not look uniform (the positive and negative periods of the square wave are not equal), and there is a certain offset, and the midpoint is not at 0. Why is this? I attached the image I acquired via matlab.
I attached the register values I wrote.
ID | 0x00 | 0x3E | ||||||||
CONFIG1 | 0x01 | 0xD6 | ||||||||
CONFIG2 | 0x02 | 0xD0 | ||||||||
CONFIG3 | 0x03 | 0xE0 | ||||||||
LOFF | 0x04 | 0x00 | ||||||||
CH1SET | 0x05 | 0x15 | ||||||||
CH2SET | 0x06 | 0xE5 | ||||||||
CH3SET | 0x07 | 0xE5 | ||||||||
CH4SET | 0x08 | 0xE5 | ||||||||
CH5SET | 0x09 | 0xE5 | ||||||||
CH6SET | 0x0A | 0xE5 | ||||||||
CH7SET | 0x0B | 0xE5 | ||||||||
CH8SET | 0x0C | 0xE5 | ||||||||
BIAS_SENSP | 0x0D | 0x00 | ||||||||
BIAS_SENSN | 0x0E | 0x00 | ||||||||
LOFF_SENSP | 0x0F | 0x00 | ||||||||
LOFF_SENSN | 0x10 | 0x00 | ||||||||
LOFF_FLIP | 0x11 | 0x00 | ||||||||
LOFF_STATP | 0x12 | 0x00 | ||||||||
LOFF_STATN | 0x13 | 0x00 | ||||||||
GPIO | 0x14 | 0x0F | ||||||||
MISC1 | 0x15 | 0x00 | ||||||||
MISC2 | 0x16 | 0x00 | ||||||||
CONFIG4 | 0x17 | 0x00 |
Regards,
Junzhe