Enable speed/temperature multiplexing on same wire

Inc/main.h

@@ -91,6 +91,8 @@
 //#define LEGALFLAG
 #define BATTERYVOLTAGE_MAX 53000
 #define R_TEMP_PULLUP 0
+#define NTC_BETA 3900
+#define SP_TEMP_MULTIPLEX 0 // high-pass ADC value on NTC-Hall multiplexed wire
 
 /* ########################## Assert Selection ############################## */
 /**
@@ -179,6 +181,19 @@ typedef struct
 
 }MotorParams_t;
 
+#ifdef R_TEMP_PULLUP
+
+typedef struct
+{
+
+	uint32_t       	num;
+	uint32_t       	denum;
+
+
+}NTC_Mult_t;
+
+#endif
+
 /* USER CODE END Private defines */
 
 #ifdef __cplusplus

Src/main.c

@@ -208,6 +208,10 @@ uint16_t VirtAddVarTab[NB_OF_VAR] = { 	EEPROM_POS_HALL_ORDER,
 		EEPROM_POS_HALL_64
 	};
 
+#if R_TEMP_PULLUP
+uint16_t ui16_adc_temp;
+#endif
+
 enum state {Stop, SixStep, Regen, Running, BatteryCurrentLimit, Interpolation, PLL, IdleRun};
 enum state SystemState;
 
@@ -261,6 +265,7 @@ static void MX_ADC2_Init(void);
 static void MX_TIM2_Init(void);
 static void MX_TIM3_Init(void);
 int16_t T_NTC(uint16_t ADC);
+void set_NTC_beta(void);
 
 void HAL_TIM_MspPostInit(TIM_HandleTypeDef *htim);
 
@@ -285,8 +290,9 @@ int8_t tics_to_speed (uint32_t tics);
 int16_t internal_tics_to_speedx100 (uint32_t tics);
 int16_t external_tics_to_speedx100 (uint32_t tics);
 
-
-
+#if (R_TEMP_PULLUP)
+NTC_Mult_t NTC_beta;
+#endif
 
 
 /* USER CODE END PFP */
@@ -586,6 +592,10 @@ int main(void)
 
 	get_standstill_position();
 
+ // Calculate multipliers for NTC 10k Beta value
+#if (R_TEMP_PULLUP)
+    set_NTC_beta();
+#endif
 
   /* USER CODE END 2 */
 
@@ -966,7 +976,11 @@ int main(void)
 
 		  if(ui8_KV_detect_flag){ui16_KV_detect_counter++;}
 #if (R_TEMP_PULLUP)
-		  MS.Temperature = T_NTC(adcData[6]); //Thank you Hendrik ;-)
+          ui16_adc_temp = adcData[6]; // adcData[5] on LSW12G
+#if (SP_TEMP_MULTIPLEX)               // ADC needs to be above this value to register temperature
+          if (ui16_adc_temp > SP_TEMP_MULTIPLEX) // 150 is a good starting point with 220R pull-up
+#endif
+          MS.Temperature = T_NTC(ui16_adc_temp); //Thank you Hendrik ;-)
 #else
 		  MS.Temperature=25;
 #endif
@@ -2406,10 +2420,22 @@ int16_t T_NTC(uint16_t ADC) // ADC 12 Bit, 10k Pullup, Rückgabewert in °C
      while(R >> n > 1) n++;
      	R <<= 13;
      	for(n <<= 6; R >> (n >> 6) >> 13; n++) R -= (R >> 10)*11; // Annäherung 1-11/1024 für 2^(-1/64)
-        int16_t T6 = 2160580/(n+357)-1639; // Berechnung für 10 kOhm-NTC (bei 25 °C) mit beta=3900 K
+        int16_t T6 = NTC_beta.num/(n+NTC_beta.denum)-1639; // Berechnung für 10 kOhm-NTC (bei 25 °C) mit beta=NTC_BETA
         return (T6 > 0 ? T6+3 : T6-2)/6; // Rundung
 
 }
+
+void set_NTC_beta()
+{
+    // 6*64/ln(2)*NTC_BETA
+    // ((6*64/ln(2) << 16)*(NTC_BETA << 16)) >> 32
+    NTC_beta.num = (((uint64_t)36306609) * (((uint64_t)NTC_BETA) << 16)) >> 32;
+    // For 10k NTC:
+    // (64)/(ln(2)*298.15)*NTC_BETA-((64/ln(2)*ln(10000))-0.5
+    // (((64/(ln(2)*298.15) << 16) * (NTC_BETA << 16)) - ((64/ln(2)*ln(10000)) << 16 - 0.5 << 16) >> 32
+    NTC_beta.denum = ((uint64_t)((uint64_t)20295 * ((uint64_t)NTC_BETA << 16)) -
+                            (uint64_t)3650351083316) >> 32;
+}
 #endif
 
 /* USER CODE END 4 */

Start_Compiling.bat

@@ -23,7 +23,7 @@ copy STLINK_system_stm32f1xx.c ..\Src\system_stm32f1xx.c
 
 make all
 
-ST-LINK_CLI.exe -c SWD -P LishuiFOC_01.hex -V
+ST-LINK_CLI.exe -c SWD SWCLK=8 -P LishuiFOC_01.hex -V
 
 pause
 

WriteOptionBytes.bat

@@ -1,6 +1,6 @@
 PATH = %PATH%;%1\STM32 ST-LINK Utility\ST-LINK Utility
 
-ST-LINK_CLI.exe -OB RDP=0
+ST-LINK_CLI.exe -c SWD SWCLK=8 -OB RDP=0
 
 pause