3 unstable releases
0.2.1 | Jan 30, 2020 |
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0.2.0 |
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0.1.1 | Nov 14, 2019 |
0.1.0 | Oct 25, 2019 |
#1463 in Embedded development
32KB
662 lines
ADS129xx
Driver crate for the Texas Instruments ADS1292 24-bit 2-channel low-power analog front end for ECG applications.
This initial version supports the ADS1292 (for the most part), but it's a goal to support the ADS1291 and ADS1292R as well.
Contributions welcome!
Usage example
// spi: spi interface
// ncs: not-Chip-Select pin
// timer: timer, 500kHz timeout.
let spi_device = SpiDevice::new(spi, ncs, timer)?;
let mut ads = Ads1292::init(spi_device)?;
// start conversions
ads.cmd(ads129xx::Command::START).unwrap();
ads.wait(200)?; // Wait a while in between sending commands
ads.cmd(ads129xx::Command::RDATAC).unwrap();
ads.wait(200)?;
let mut stream = ads.into_data_stream()?;
let mut buf = [[ChannelData::default(); 2]; 10];
// Opens stream, sends RDATAC command to ads
let data_stream = ads1292.into_data_stream()?;
ads.wait(200)?;
// A buffer to read data into
let mut buf = [[Ads1292Data::default(); 2]; 2000];
for i in buf.iter_mut() {
// some way of finding out NDRDY has been low since last read (preferably by an interrupt-set flag)
while !data_ready() {}
// data_stream always returns data (for now), so we can unwrap here
*i = data_stream.next().unwrap()?;
}
// Don't forget to close; this will send the SDATAC command to the ads
data_stream.into_inner();
Functionality
- Send commands:
ads1292.cmd(Command::START)?;
- Write to registers
ads1292.write_register(Register::CONFIG1, 0b001)?;
- Read from registers
let lead_off_status = ads1292.read_register(Register::LOFF_STAT)?;
- Read data
let data = ads1292.read_data()?;
- Read data continuously
// Opens stream, sends RDATAC command to ads
let data_stream = ads1292.into_data_stream()?;
let mut buf = [[Ads1292Data::default(); 2]; 2000];
for i in buf.iter_mut() {
while !data_ready() {}
*i = data_stream.next().unwrap().unwrap();
}
// Don't forget to close; this will send the SDATAC command to the ads
data_stream.into_inner();
TODO's
- Support ADS1292R
- Support ADS1291
- Non-blockingly wait after sending SPI commands
- Documentation
- Separate device-specific and universal code
Dependencies
~110KB