EIS: Adjust delay before first measurement.

src/eis_shield/ad5933.c

@@ -115,6 +115,8 @@ static bool set_settling_cycles(uint16_t cycles);
 static void set_gain(uint8_t pga_gain, uint8_t o_range);
 static void set_control_mode(uint8_t);
 
+static uint16_t init_settle_ms = 400;
+
 
 static uint8_t read_byte(uint8_t address) {
     /**
@@ -220,7 +222,7 @@ static void write_block(uint8_t address, uint8_t length, uint8_t* buffer) {
 }
 
 void ad5933_set_params(uint32_t start, uint32_t increment, uint16_t n_increments,
-                        uint16_t settle_cycles, uint8_t gain, uint8_t output_range) {
+                        uint16_t settle_cycles, uint8_t gain, uint8_t output_range, uint16_t init_ms) {
     /**
      * Set EIS sweep parameters.
      *
@@ -237,6 +239,7 @@ void ad5933_set_params(uint32_t start, uint32_t increment, uint16_t n_increments
     set_num_increments(n_increments);
     set_gain(gain, output_range);
     set_settling_cycles(settle_cycles);
+    init_settle_ms = init_ms;
     
     return;
 }
@@ -395,7 +398,7 @@ cint16_t ad5933_measure_one(uint8_t measure_type) {
             ad5933_reset();
             set_control_mode(CTRL_STANDBY_MODE);
             set_control_mode(CTRL_INIT_START_FREQ);
-            delay_ms(400);
+            delay_ms(init_settle_ms);
             set_control_mode(CTRL_START_FREQ_SWEEP);
             break;
         

src/eis_shield/ad5933.h

@@ -25,7 +25,8 @@ typedef struct c_int16_t {
 void ad5933_set_internal_mclk(uint8_t internal);
 void ad5933_reset(void);
 void ad5933_set_params(uint32_t start, uint32_t increment, uint16_t n_increments,
-                        uint16_t settle_cycles, uint8_t gain, uint8_t output_range);
+                        uint16_t settle_cycles, uint8_t gain, uint8_t output_range,
+                        uint16_t init_ms);
 void ad5933_sweep(cint16_t imp[], int n);
 cint16_t ad5993_get_complex_data(void);
 cint16_t ad5933_measure_one(uint8_t measure_type);

src/eis_shield/eis.c

@@ -24,7 +24,7 @@ void eis_init(void){
 void eis_measure_auto(uint32_t start, uint32_t increment, uint16_t n_increments,
                              uint16_t settle_cycles, uint8_t pga_gain, uint8_t output_range,
                              uint8_t iv_gain, uint16_t attenuation, uint16_t offset,
-                             uint8_t reference, cint16_t* result_buffer){
+                             uint8_t reference, uint16_t init_ms, cint16_t* result_buffer){
     /**
      Runs eis experiment in auto mode and writes result to buffer.
      
@@ -38,10 +38,11 @@ void eis_measure_auto(uint32_t start, uint32_t increment, uint16_t n_increments,
      @param attenuation gain setting
      @param offset offset voltage in max5443 units
      @param reference Reference connection setting
+     @param init_ms Delay before first measurement in ms
      @param result_buffer Buffer to store results
      */
     eis_set_mclk(0);
-    ad5933_set_params(start, increment, n_increments, settle_cycles, pga_gain, output_range);
+    ad5933_set_params(start, increment, n_increments, settle_cycles, pga_gain, output_range, init_ms);
     eis_set_ref(reference);
     eis_set_gain(iv_gain);
     ad5272_write_rdac(attenuation);
@@ -57,9 +58,9 @@ void eis_measure_auto(uint32_t start, uint32_t increment, uint16_t n_increments,
 void eis_set_params(uint32_t start, uint32_t increment, uint16_t n_increments,
                      uint16_t settle_cycles, uint8_t pga_gain, uint8_t output_range,
                      uint8_t iv_gain, uint16_t attenuation, uint16_t offset,
-                     uint8_t reference, uint16_t mclk_div2){
+                     uint8_t reference, uint16_t mclk_div2, uint16_t init_ms){
     eis_set_mclk(mclk_div2);
-    ad5933_set_params(start, increment, n_increments, settle_cycles, pga_gain, output_range);
+    ad5933_set_params(start, increment, n_increments, settle_cycles, pga_gain, output_range, init_ms);
     eis_set_ref(reference);
     eis_set_gain(iv_gain);
     ad5272_write_rdac(attenuation);

src/eis_shield/eis.h

@@ -22,11 +22,11 @@ void eis_init(void);
 void eis_measure_auto(uint32_t start, uint32_t increment, uint16_t n_increments,
                       uint16_t settle_cycles, uint8_t pga_gain, uint8_t output_range,
                       uint8_t iv_gain, uint16_t attenuation, uint16_t offset,
-                      uint8_t reference, cint16_t* result_buffer);
+                      uint8_t reference, uint16_t init_ms, cint16_t* result_buffer);
 void eis_set_params(uint32_t start, uint32_t increment, uint16_t n_increments,
                     uint16_t settle_cycles, uint8_t pga_gain, uint8_t output_range,
                     uint8_t iv_gain, uint16_t attenuation, uint16_t offset,
-                    uint8_t reference, uint16_t mclk_div2);
+                    uint8_t reference, uint16_t mclk_div2, uint16_t init_ms);
 cint16_t eis_measure_one(void);
 
 extern uint8_t eis_status;