ad5933: Add single stepping measurement function.

src/ad5933.c

@@ -265,13 +265,13 @@ static void internal_clock_set(bool internal) {
 }
 
 void ad5933_test(void){
-    ad5933_set_params(0x0f5c28, 0x14f, 10, 100, 1);
+    ad5933_set_params(0x0f5c28, 0x9f4f, 10, 2000, 1);
     
-    cuint16_t result[10];
+    cint16_t result[10];
     ad5933_sweep(result, 10);
     
     for (uint8_t n = 0; n < 10; n++) {
-        printf("%u + %ui\r\n", result[n].real, result[n].imag);
+        printf("%i + %ii\r\n", result[n].real, result[n].imag);
     }
 }
 
@@ -378,7 +378,7 @@ static void set_control_mode(uint8_t mode) {
     return;
 }
 
-void ad5933_sweep(cuint16_t imp[], int n) {
+void ad5933_sweep(cint16_t imp[], int n) {
     reset();
     set_control_mode(CTRL_STANDBY_MODE);
     set_control_mode(CTRL_INIT_START_FREQ);
@@ -401,11 +401,51 @@ void ad5933_sweep(cuint16_t imp[], int n) {
     return;
 }
 
+cint16_t ad5933_measure_one(uint8_t measure_type) {
+    cint16_t data;
+    
+    if ((read_byte(STATUS_REG) & STATUS_SWEEP_DONE) == STATUS_SWEEP_DONE) {
+        data.real = 0;
+        data.imag = 0;
+        printf("#INFO: AD5933: Reached end of sweep.\r\n");
+        set_control_mode(CTRL_POWER_DOWN_MODE);
+        return data;
+    }
+    
+    switch (measure_type) {
+        case AD5933_MEASURE_FIRST:
+            reset();
+            set_control_mode(CTRL_STANDBY_MODE);
+            set_control_mode(CTRL_INIT_START_FREQ);
+            delay_ms(400);
+            set_control_mode(CTRL_START_FREQ_SWEEP);
+            break;
+        
+        case AD5933_MEASURE_NEXT:
+            set_control_mode(CTRL_INCREMENT_FREQ);
+            break;
+            
+        case AD5933_MEASURE_REPEAT:
+            set_control_mode(CTRL_REPEAT_FREQ);
+            break;
+            
+        default:
+            printf("#ERR: AD5933: Invalid frequency mode selected.\r\n");
+            data.real = 0;
+            data.imag = 0;
+            return data;
+    }
+    
+    
+    return(ad5993_get_complex_data());
+}
+
 
-cuint16_t ad5993_get_complex_data(void) {
+cint16_t ad5993_get_complex_data(void) {
     // poll the status register to check for data to receive
     while ((read_byte(STATUS_REG) & STATUS_DATA_VALID) != STATUS_DATA_VALID){
-        delay_ms(30);
+//        delay_ms(30);
+        delay_ms(10);
     }
     
     uint16_t real;
@@ -414,7 +454,7 @@ cuint16_t ad5993_get_complex_data(void) {
     read_block(REAL_DATA_1, 2, (uint8_t*)&real);
     read_block(IMAG_DATA_1, 2, (uint8_t*)&imag);
     
-    cuint16_t result;
+    cint16_t result;
     
     result.real = swap16(real);
     result.imag = swap16(imag);

src/ad5933.h

@@ -13,15 +13,20 @@
 #include <math.h>
 #include <stdio.h>
 
-typedef struct c_uint16_t {
-    uint16_t real;
-    uint16_t imag;
-} cuint16_t;
+#define AD5933_MEASURE_FIRST    0
+#define AD5933_MEASURE_REPEAT   1
+#define AD5933_MEASURE_NEXT     2
+
+typedef struct c_int16_t {
+    int16_t real;
+    int16_t imag;
+} cint16_t;
 
 void ad5933_set_params(uint32_t start, uint32_t increment, uint16_t n_increments,
                         uint16_t settle_cycles, uint8_t gain);
-void ad5933_sweep(cuint16_t imp[], int n);
-cuint16_t ad5993_get_complex_data(void);
+void ad5933_sweep(cint16_t imp[], int n);
+cint16_t ad5993_get_complex_data(void);
+cint16_t ad5933_measure_one(uint8_t measure_type);
 
 void ad5933_test(void);