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ad7172: fix calibration

This commit is contained in:
Astro 2020-05-17 02:11:53 +02:00
parent ba860e52ac
commit 34c2da4484
2 changed files with 53 additions and 5 deletions
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42
src/ad7172/adc.rs
View File

@ -43,7 +43,7 @@ impl<SPI: Transfer<u8, Error = E>, NSS: OutputPin, E: fmt::Debug> Adc<SPI, NSS>
let mut adc_mode = <regs::AdcMode as Register>::Data::empty();
adc_mode.set_ref_en(true);
adc_mode.set_mode(Mode::ContinuousConversion);
adc_mode.set_mode(Mode::Standby);
adc.write_reg(&regs::AdcMode, &mut adc_mode)?;
Ok(adc)
@ -96,16 +96,52 @@ impl<SPI: Transfer<u8, Error = E>, NSS: OutputPin, E: fmt::Debug> Adc<SPI, NSS>
Ok(())
}
pub fn disable_channel(
&mut self, index: u8
) -> Result<(), SPI::Error> {
self.update_reg(&regs::Channel { index }, |data| {
data.set_enabled(false);
})?;
Ok(())
}
pub fn disable_all_channels(&mut self) -> Result<(), SPI::Error> {
for index in 0..4 {
self.update_reg(&regs::Channel { index }, |data| {
data.set_enabled(false);
})?;
}
Ok(())
}
/// Calibrates offset registers
pub fn calibrate_offset(&mut self) -> Result<(), SPI::Error> {
pub fn calibrate(&mut self) -> Result<(), SPI::Error> {
// internal offset calibration
self.update_reg(&regs::AdcMode, |adc_mode| {
adc_mode.set_mode(Mode::InternalOffsetCalibration);
})?;
while ! self.read_reg(&regs::Status)?.ready() {}
// system offset calibration
self.update_reg(&regs::AdcMode, |adc_mode| {
adc_mode.set_mode(Mode::SystemOffsetCalibration);
})?;
while ! self.read_reg(&regs::Status)?.ready() {}
// system gain calibration
self.update_reg(&regs::AdcMode, |adc_mode| {
adc_mode.set_mode(Mode::ContinuousConversion);
adc_mode.set_mode(Mode::SystemGainCalibration);
})?;
while ! self.read_reg(&regs::Status)?.ready() {}
Ok(())
}
pub fn start_continuous_conversion(&mut self) -> Result<(), SPI::Error> {
let mut adc_mode = <regs::AdcMode as Register>::Data::empty();
adc_mode.set_ref_en(true);
adc_mode.set_mode(Mode::ContinuousConversion);
self.write_reg(&regs::AdcMode, &mut adc_mode)?;
Ok(())
}

16
src/channels.rs
View File

@ -26,10 +26,22 @@ impl Channels {
let mut adc = ad7172::Adc::new(pins.adc_spi, pins.adc_nss).unwrap();
// Feature not used
adc.set_sync_enable(false).unwrap();
// Setup channels
// Calibrate ADC channels individually
adc.disable_all_channels().unwrap();
adc.setup_channel(0, ad7172::Input::Ain0, ad7172::Input::Ain1).unwrap();
adc.calibrate().unwrap();
adc.disable_channel(0).unwrap();
adc.setup_channel(1, ad7172::Input::Ain2, ad7172::Input::Ain3).unwrap();
adc.calibrate().unwrap();
adc.disable_channel(1).unwrap();
// Setup channels and start ADC
adc.setup_channel(0, ad7172::Input::Ain0, ad7172::Input::Ain1).unwrap();
adc.setup_channel(1, ad7172::Input::Ain2, ad7172::Input::Ain3).unwrap();
adc.calibrate_offset().unwrap();
adc.start_continuous_conversion().unwrap();
Channels { channel0, channel1, adc, pwm }
}