LUMZ-bioz/bioz-firmware-rs
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Implemented LP DAC for enabling common-mode during 4-lead measurement.

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Hubald Verzijl
2025-11-06 11:33:49 +01:00
parent 324189ba72
commit 3716d7367e
3 changed files with 251 additions and 0 deletions
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41
src/impedance.rs
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@@ -83,6 +83,9 @@ impl ImpedanceSetup {
self.ad5940.apply_clk_config(&clk_config).await.unwrap();
// Configure LP DAC and TIA
self.common_mode_output_enable(false).await.unwrap();
// Set DSP configuration
let mut dsp_config = DspConfig::default();
dsp_config
@@ -253,7 +256,36 @@ impl ImpedanceSetup {
Ok(results)
}
pub async fn common_mode_output_enable(&mut self, enable: bool) -> Result<(), Error> {
// Configure LP DAC and TIA
let mut lp_config = LpConfig::default();
if enable {
lp_config
.data_reset(true)
.power_enable(true)
.data_6bit(31) // Mid-scale for 6-bit DAC
.common_mode_enable(true)
.tia_switches_enabled(1 << 5 | 1 << 7 | 1 << 9 | 1 << 13)
.tia_enable(true)
.filter_resistor(TIARF::R20k);
} else {
lp_config
.power_enable(false)
.common_mode_enable(false)
.tia_enable(false);
}
self.ad5940.apply_lp_config(&lp_config).await.unwrap();
Ok(())
}
pub async fn init_single_frequency_measurement_2_lead(&mut self, frequency: u32, dft_number: IcdDftNum) -> Result<f32, ImpedanceInitError> {
// Configure LP DAC and TIA
self.common_mode_output_enable(false).await.unwrap();
// Reset FIFO
self.ad5940.clear_and_enable_fifo().await.unwrap();
@@ -333,6 +365,9 @@ impl ImpedanceSetup {
}
pub async fn init_single_frequency_measurement_4_lead(&mut self, frequency: u32, dft_number: IcdDftNum) -> Result<f32, ImpedanceInitError> {
// Configure LP DAC and TIA
self.common_mode_output_enable(true).await.unwrap();
// Reset FIFO
self.ad5940.clear_and_enable_fifo().await.unwrap();
@@ -430,6 +465,9 @@ impl ImpedanceSetup {
}
pub async fn init_multi_frequency_measurement_2_lead<const N: usize>(&mut self, number_of_points: MeasurementPointSet) -> Result<heapless::Vec<f32, N>, ImpedanceInitError> {
// Configure LP DAC and TIA
self.common_mode_output_enable(false).await.unwrap();
// Create vector to store the periods per DFT for each frequency
let mut periods_per_dft_vec = heapless::Vec::<f32, N>::new();
@@ -535,6 +573,9 @@ impl ImpedanceSetup {
}
pub async fn init_multi_frequency_measurement_4_lead<const N: usize>(&mut self, number_of_points: MeasurementPointSet) -> Result<heapless::Vec<f32, N>, ImpedanceInitError> {
// Configure LP DAC and TIA
self.common_mode_output_enable(true).await.unwrap();
// Create vector to store the periods per DFT for each frequency
let mut periods_per_dft_vec = heapless::Vec::<f32, N>::new();