make self-cal reference frequency configurable

3 files changed, 8 insertions, 3 deletions

diff --git a/device-functions.c b/device-functions.c
index 2565a02..9f3a086 100644
--- a/device-functions.c
+++ b/device-functions.c
@@ -4222,7 +4222,8 @@ int I2C_Self_Cal(int channel, int meas_mode, float *meas, float target_time)
 			continue;
 		}
 
-		this = count * 100e-9;
+		this = count / get_bounded_float (globals.Flash.self_cal_ref_freq, SELF_CAL_REF_FREQ);
+
 		max_error = 0.001;
 		avg = 0.0;
 
diff --git a/flash.c b/flash.c
index 92a5370..529ce74 100644
--- a/flash.c
+++ b/flash.c
@@ -517,6 +517,8 @@ static void initFlashValues(FlashStruct *mem)
 
 	mem->prf_limiter=1;
 
+	mem->self_cal_ref_freq = SELF_CAL_REF_FREQ;
+
 	mem->pcb116c_mon=1;	/* more recent ADC, different reading code */
 	mem->warn_even_if_output_off=0;
 
diff --git a/globals.h b/globals.h
index 6645967..147eb7e 100644
--- a/globals.h
+++ b/globals.h
@@ -230,7 +230,7 @@
 
 // hardware default values
 #define DEFAULT_OUTPUT_ON_DELAY 0.8	// needs at least 800 ms, due to soft-on circuit
-
+#define SELF_CAL_REF_FREQ	1e7	// 10 MHz
 
 // menu stuff
 #define Main_Menu_On 0
@@ -464,7 +464,9 @@ typedef struct {
 
 	char prf_limiter;		/* 243 */
 
-	char spare_padding[12];		/* 244 - padding between common and per-channel sections of the */
+	float self_cal_ref_freq;	/* 244 */
+
+	char spare_padding[8];		/* 248 - padding between common and per-channel sections of the */
 	/* flash eeprom. Adjust size if variables added to common section, */
 	/* so that per-channel section starts at 256 */