Calibration persistence: added EEPROM write

Applications/calscope/src/calib.c

@@ -80,6 +80,64 @@ int rp_read_calib_params(rp_calib_params_t *calib_params)
 }
 
 
+/*----------------------------------------------------------------------------*/
+/**
+ * @brief Write calibration parameters to EEPROM device.
+ *
+ * Function writes calibration parameters to EEPROM device. 
+ * Communication to the EEPROM device is taken place through
+ * appropriate system driver accessed through the file system device
+ * /sys/bus/i2c/devices/0-0050/eeprom.
+ *
+ * @param[out]   calib_params  Pointer to source buffer.
+ * @retval       0 Success
+ * @retval      -1 Failure, error message is put on stderr device
+ *
+ */
+int rp_write_calib_params(rp_calib_params_t *calib_params)
+{
+    FILE   *fp;
+    size_t  size;
+
+    /* sanity check */
+    if(calib_params == NULL) {
+        fprintf(stderr, "rp_write_calib_params(): input structure "
+                "not initialized\n");
+        return -1;
+    }
+
+    /* open eeprom device */
+    fp=fopen(eeprom_device, "rw+");
+    if(fp == NULL) {
+        fprintf(stderr, "rp_write_calib_params(): Can not open EEPROM device: "
+                " %s\n", strerror(errno));
+	fclose(fp);
+       return -1;
+    }
+
+    /* ...and seek to the appropriate storage offset */
+    if(fseek(fp, eeprom_calib_off, SEEK_SET) < 0) {
+        fclose(fp);
+        fprintf(stderr, "rp_write_calib_params(): fseek() failed: %s\n", 
+                strerror(errno));
+        return -1;
+    }
+
+    /* write data to eeprom component from specified buffer */
+    size=fwrite(calib_params, sizeof(char), sizeof(rp_calib_params_t), fp);
+    if(size != sizeof(rp_calib_params_t)) {
+        fclose(fp);
+        fprintf(stderr, "rp_write_calib_params(): fwrite() failed, "
+                "returned bytes: %d (should be :%d)\n", size, 
+                sizeof(rp_calib_params_t));
+        return -1;
+    }
+    fclose(fp);
+
+    return 0;
+}
+
+
 /*----------------------------------------------------------------------------*/
 /**
  * Initialize calibration parameters to default values.

Applications/calscope/src/calib.h

@@ -39,7 +39,7 @@ typedef struct rp_osc_calib_params_s {
 /** @} */
 
 int rp_read_calib_params(rp_calib_params_t *calib_params);
-
+int rp_write_calib_params(rp_calib_params_t *calib_params);
 int rp_default_calib_params(rp_calib_params_t *calib_params);
 
 #endif //__CALIB_H

Applications/calscope/src/main.c

@@ -1054,6 +1054,15 @@ void dir_gen_set(int ch, int param, int value)
 }
 
 
+void write_cal_eeprom( void)
+{
+  if(rp_write_calib_params(&rp_main_calib_params) < 0) {
+        fprintf(stderr, "rp_write_calib_params() failed. \n");
+   }
+}
+
+
+
 float rp_gen_limit_freq(float freq, float gen_type)
 {
     int type = (int)gen_type;
@@ -1082,3 +1091,6 @@ float rp_gen_limit_freq(float freq, float gen_type)
 
     return freq;
 }
+
+
+

Applications/calscope/src/main.h

@@ -157,4 +157,6 @@ float rp_gen_limit_freq(float freq, float gen_type);
 
 void dir_gen_set(int ch, int param, int value);
 
+void write_cal_eeprom( void);
+
 #endif /*  __MAIN_H */

Applications/calscope/src/worker.c

@@ -586,7 +586,8 @@ void *rp_osc_worker_thread(void *args)
 	    // DC offset calibration (inputs)
 	    if (round(curr_params[DC_CAL].value) != cal_old) {  // When associated  client button is clicked...
                 rp_calib_params->fe_ch1_dc_offs=-rp_osc_mean_dc_offset(&ch1_meas);
-                rp_calib_params->fe_ch2_dc_offs=-rp_osc_mean_dc_offset(&ch2_meas);	
+                rp_calib_params->fe_ch2_dc_offs=-rp_osc_mean_dc_offset(&ch2_meas);
+		write_cal_eeprom();
             } 
 
             cal_old=round(curr_params[DC_CAL].value);
@@ -618,7 +619,7 @@ void *rp_osc_worker_thread(void *args)
 
 	      // New calibration constant
               rp_calib_params->be_ch1_dc_offs=-dc_offs_in_DAC_counts;
-
+	      write_cal_eeprom();
 
 	      dir_gen_set(0, 0, 0x11);	     // Enable signal on ch1
 
@@ -668,6 +669,7 @@ void *rp_osc_worker_thread(void *args)
 	      // New calibration constant
               rp_calib_params->be_ch2_dc_offs=-dc_offs_in_DAC_counts;
 
+	      write_cal_eeprom();
 
 	      dir_gen_set(1, 0, 0x11);	     // Enable signal on ch1