From 0e7a574ebbf882d96bc74ea47d09bc9289764f5d Mon Sep 17 00:00:00 2001
From: Thomas Roell <grumpyoldpizza@gmail.com>
Date: Sun, 12 Aug 2018 07:17:11 -0600
Subject: [PATCH 1/5] Avoid glitches on repeated analogWrite() PWM

---
 cores/stm32l4/stm32l4_wiring_analog.c | 67 ++++++++++++++++-----------
 1 file changed, 39 insertions(+), 28 deletions(-)

diff --git a/cores/stm32l4/stm32l4_wiring_analog.c b/cores/stm32l4/stm32l4_wiring_analog.c
index f7b3f635..d0b72de3 100644
--- a/cores/stm32l4/stm32l4_wiring_analog.c
+++ b/cores/stm32l4/stm32l4_wiring_analog.c
@@ -38,6 +38,7 @@ static stm32l4_dac_t stm32l4_dac;
 #endif /* defined(PIN_DAC0) || defined(PIN_DAC1) */
 static stm32l4_timer_t stm32l4_pwm[PWM_INSTANCE_COUNT];
 
+static uint8_t _channels[PWM_INSTANCE_COUNT];
 static int _readResolution = 10;
 static int _writeResolution = 8;
 
@@ -48,6 +49,7 @@ static uint8_t _writeCalibrate = 3;
 
 void analogReference(eAnalogReference reference)
 {
+    (void)reference;
 }
 
 void analogReadResolution(int resolution)
@@ -264,32 +266,6 @@ void analogWrite(uint32_t pin, uint32_t value)
     {
 	instance = g_APinDescription[pin].pwm_instance;
 
-	if (stm32l4_pwm[instance].state == TIMER_STATE_NONE)
-	{
-	    stm32l4_timer_create(&stm32l4_pwm[instance], g_PWMInstances[instance], STM32L4_PWM_IRQ_PRIORITY, 0);
-
-	    if (_writeFrequency[instance] && _writeRange[instance])
-	    {
-		carrier = _writeFrequency[instance] * _writeRange[instance];
-		modulus = _writeRange[instance];
-	    }
-	    else
-	    {
-		carrier = 2000000;
-		modulus = 4095;
-	    }
-
-	    divider = stm32l4_timer_clock(&stm32l4_pwm[instance]) / carrier;
-
-	    if (divider == 0)
-	    {
-		divider = 1;
-	    }
-
-	    stm32l4_timer_enable(&stm32l4_pwm[instance], divider -1, modulus -1, 0, NULL, NULL, 0);
-	    stm32l4_timer_start(&stm32l4_pwm[instance], false);
-	}
-
 	if (_writeFrequency[instance] && _writeRange[instance])
 	{
 	    if (value > _writeRange[instance])
@@ -302,9 +278,44 @@ void analogWrite(uint32_t pin, uint32_t value)
 	    value = mapResolution(value, _writeResolution, 12);
 	}
 
-	stm32l4_gpio_pin_configure(g_APinDescription[pin].pin, (GPIO_PUPD_NONE | GPIO_OSPEED_HIGH | GPIO_OTYPE_PUSHPULL | GPIO_MODE_ALTERNATE));
+	if (_channels[instance] & (1u << g_APinDescription[pin].pwm_channel))
+	{
+	    stm32l4_timer_compare(&stm32l4_pwm[instance], g_APinDescription[pin].pwm_channel, value);
+	}
+	else
+	{
+	    _channels[instance] |= (1u << g_APinDescription[pin].pwm_channel);
 
-	stm32l4_timer_channel(&stm32l4_pwm[instance], g_APinDescription[pin].pwm_channel, value, TIMER_CONTROL_PWM);
+	    if (stm32l4_pwm[instance].state == TIMER_STATE_NONE)
+	    {
+		stm32l4_timer_create(&stm32l4_pwm[instance], g_PWMInstances[instance], STM32L4_PWM_IRQ_PRIORITY, 0);
+		
+		if (_writeFrequency[instance] && _writeRange[instance])
+		{
+		    carrier = _writeFrequency[instance] * _writeRange[instance];
+		    modulus = _writeRange[instance];
+		}
+		else
+		{
+		    carrier = 2000000;
+		    modulus = 4095;
+		}
+		
+		divider = stm32l4_timer_clock(&stm32l4_pwm[instance]) / carrier;
+		
+		if (divider == 0)
+		{
+		    divider = 1;
+		}
+		
+		stm32l4_timer_enable(&stm32l4_pwm[instance], divider -1, modulus -1, 0, NULL, NULL, 0);
+		stm32l4_timer_start(&stm32l4_pwm[instance], false);
+	    }
+	    
+	    stm32l4_gpio_pin_configure(g_APinDescription[pin].pin, (GPIO_PUPD_NONE | GPIO_OSPEED_HIGH | GPIO_OTYPE_PUSHPULL | GPIO_MODE_ALTERNATE));
+	    
+	    stm32l4_timer_channel(&stm32l4_pwm[instance], g_APinDescription[pin].pwm_channel, value, TIMER_CONTROL_PWM);
+	}
 
 	return;
     }

From 34199589c08a0ff0437a7ed86d5c65055463d757 Mon Sep 17 00:00:00 2001
From: Thomas Roell <grumpyoldpizza@gmail.com>
Date: Sun, 16 Sep 2018 10:09:35 -0600
Subject: [PATCH 2/5] add analogReadPeriod()

---
 cores/stm32l4/STM32.cpp                |  10 ++--
 cores/stm32l4/stm32l4_wiring.h         |   1 +
 cores/stm32l4/stm32l4_wiring_analog.c  |   9 ++-
 system/STM32L4xx/Include/stm32l4_adc.h |   6 +-
 system/STM32L4xx/Lib/boot_stm32l432.o  | Bin 19455 -> 19407 bytes
 system/STM32L4xx/Lib/boot_stm32l433.o  | Bin 19491 -> 19443 bytes
 system/STM32L4xx/Lib/boot_stm32l476.o  | Bin 19935 -> 19887 bytes
 system/STM32L4xx/Lib/boot_stm32l496.o  | Bin 20115 -> 20067 bytes
 system/STM32L4xx/Lib/libstm32l432.a    | Bin 1262610 -> 1263814 bytes
 system/STM32L4xx/Lib/libstm32l433.a    | Bin 1328618 -> 1329826 bytes
 system/STM32L4xx/Lib/libstm32l476.a    | Bin 1432038 -> 1433246 bytes
 system/STM32L4xx/Lib/libstm32l496.a    | Bin 1440040 -> 1441248 bytes
 system/STM32L4xx/Source/stm32l4_adc.c  |  77 +++++++++++++++----------
 13 files changed, 64 insertions(+), 39 deletions(-)

diff --git a/cores/stm32l4/STM32.cpp b/cores/stm32l4/STM32.cpp
index e943390b..27f914eb 100644
--- a/cores/stm32l4/STM32.cpp
+++ b/cores/stm32l4/STM32.cpp
@@ -67,8 +67,8 @@ float STM32Class::getVBAT()
 	stm32l4_adc_enable(&stm32l4_adc, 0, NULL, NULL, 0);
     }
 
-    vref_data = stm32l4_adc_convert(&stm32l4_adc, ADC_CHANNEL_ADC1_VREFINT);
-    vbat_data = stm32l4_adc_convert(&stm32l4_adc, ADC_CHANNEL_ADC1_VBAT);
+    vref_data = stm32l4_adc_convert(&stm32l4_adc, ADC_CHANNEL_ADC1_VREFINT, ADC_VREFINT_PERIOD);
+    vbat_data = stm32l4_adc_convert(&stm32l4_adc, ADC_CHANNEL_ADC1_VBAT, ADC_VBAT_PERIOD);
 
     stm32l4_adc_disable(&stm32l4_adc);
 
@@ -93,7 +93,7 @@ float STM32Class::getVREF()
 	stm32l4_adc_enable(&stm32l4_adc, 0, NULL, NULL, 0);
     }
 
-    vref_data = stm32l4_adc_convert(&stm32l4_adc, ADC_CHANNEL_ADC1_VREFINT);
+    vref_data = stm32l4_adc_convert(&stm32l4_adc, ADC_CHANNEL_ADC1_VREFINT, ADC_VREFINT_PERIOD);
 
     stm32l4_adc_disable(&stm32l4_adc);
 
@@ -118,8 +118,8 @@ float STM32Class::getTemperature()
 	stm32l4_adc_enable(&stm32l4_adc, 0, NULL, NULL, 0);
     }
 
-    vref_data = stm32l4_adc_convert(&stm32l4_adc, ADC_CHANNEL_ADC1_VREFINT);
-    ts_data = stm32l4_adc_convert(&stm32l4_adc, ADC_CHANNEL_ADC1_TS);
+    vref_data = stm32l4_adc_convert(&stm32l4_adc, ADC_CHANNEL_ADC1_VREFINT, ADC_VREFINT_PERIOD);
+    ts_data = stm32l4_adc_convert(&stm32l4_adc, ADC_CHANNEL_ADC1_TS, ADC_TSENSE_PERIOD);
 
     stm32l4_adc_disable(&stm32l4_adc);
 
diff --git a/cores/stm32l4/stm32l4_wiring.h b/cores/stm32l4/stm32l4_wiring.h
index a07761ed..5081c8fe 100644
--- a/cores/stm32l4/stm32l4_wiring.h
+++ b/cores/stm32l4/stm32l4_wiring.h
@@ -84,6 +84,7 @@ typedef enum _eAnalogReference {
 
 extern void analogReference(eAnalogReference reference);
 extern void analogReadResolution(int resolution);
+extern void analogReadPeriod(int period);
 extern uint32_t analogRead(uint32_t pin);
 extern void analogWriteResolution(int resolution);
 extern void analogWriteFrequency(uint32_t pin, uint32_t frequency);
diff --git a/cores/stm32l4/stm32l4_wiring_analog.c b/cores/stm32l4/stm32l4_wiring_analog.c
index d0b72de3..351e60cd 100644
--- a/cores/stm32l4/stm32l4_wiring_analog.c
+++ b/cores/stm32l4/stm32l4_wiring_analog.c
@@ -39,7 +39,9 @@ static stm32l4_dac_t stm32l4_dac;
 static stm32l4_timer_t stm32l4_pwm[PWM_INSTANCE_COUNT];
 
 static uint8_t _channels[PWM_INSTANCE_COUNT];
+
 static int _readResolution = 10;
+static int _readPeriod = 2;
 static int _writeResolution = 8;
 
 static uint32_t _writeFrequency[PWM_INSTANCE_COUNT];
@@ -57,6 +59,11 @@ void analogReadResolution(int resolution)
     _readResolution = resolution;
 }
 
+void analogReadPeriod(int period)
+{
+    _readPeriod = period;
+}
+
 static inline uint32_t mapResolution(uint32_t value, uint32_t from, uint32_t to)
 {
     if (from == to)
@@ -115,7 +122,7 @@ uint32_t analogRead(uint32_t pin)
 
     stm32l4_gpio_pin_configure(g_APinDescription[pin].pin, (GPIO_PUPD_NONE | GPIO_MODE_ANALOG | GPIO_ANALOG_SWITCH));
 
-    input = stm32l4_adc_convert(&stm32l4_adc, g_APinDescription[pin].adc_input);
+    input = stm32l4_adc_convert(&stm32l4_adc, g_APinDescription[pin].adc_input, _readPeriod);
 
     stm32l4_adc_disable(&stm32l4_adc);
 
diff --git a/system/STM32L4xx/Include/stm32l4_adc.h b/system/STM32L4xx/Include/stm32l4_adc.h
index d9d57f4e..744cdf2f 100644
--- a/system/STM32L4xx/Include/stm32l4_adc.h
+++ b/system/STM32L4xx/Include/stm32l4_adc.h
@@ -71,6 +71,10 @@ enum {
 
 typedef void (*stm32l4_adc_callback_t)(void *context, uint32_t events);
 
+#define ADC_VREFINT_PERIOD                       4
+#define ADC_VBAT_PERIOD                          12
+#define ADC_TSENSE_PERIOD                        5
+
 #define ADC_STATE_NONE                         0
 #define ADC_STATE_INIT                         1
 #define ADC_STATE_BUSY                         2
@@ -93,7 +97,7 @@ extern bool     stm32l4_adc_disable(stm32l4_adc_t *adc);
 extern bool     stm32l4_adc_configure(stm32l4_adc_t *adc, uint32_t option);
 extern bool     stm32l4_adc_calibrate(stm32l4_adc_t *adc);
 extern bool     stm32l4_adc_notify(stm32l4_adc_t *adc, stm32l4_adc_callback_t callback, void *context, uint32_t events);
-extern uint32_t stm32l4_adc_convert(stm32l4_adc_t *adc, unsigned int channel);
+extern uint32_t stm32l4_adc_convert(stm32l4_adc_t *adc, unsigned int channel, unsigned int period);
 
 #ifdef __cplusplus
 }
diff --git a/system/STM32L4xx/Lib/boot_stm32l432.o b/system/STM32L4xx/Lib/boot_stm32l432.o
index 040478335d015c15c8d6af08026318ee93936436..ef7e5781c5a986da040b26a5fbc67f43675ff252 100644
GIT binary patch
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z@m08o<H0XPJkrqGTpvl$wWcGoyuGfov86TAP}5%5RnuM{+1B3K+}6|DRM*zHb7xJY
zBhef!Zi+=ZdO8yI&5;e&4@QgQvF`53hStvZ+WO%Y`IjBT>*kODpUajm=y8fkJrrGM
z8s*xItu?*n`XRdImh0zZYsIGFiP%yh26a)%I&oF+E9ny5`WCI9(`!oSi+bHzI?oIi
v=x0jv#7+ID(tPoW9;a)YPA|(hgGG8#S)SOUYs&J)8~Sm&-W(n(n?3!%>q|Ej

diff --git a/system/STM32L4xx/Lib/boot_stm32l433.o b/system/STM32L4xx/Lib/boot_stm32l433.o
index 2da51d7fa701c3159e0ca0a2657eb5600923c291..d47e2e5aa10a1ec540b6cb550f96fcf33acba506 100644
GIT binary patch
delta 2990
zcmbW2e{fXQ702Iwd2jFLZg#VTkYvrK2G~s&*pM{4BpVD8LW+oyq$EYL)`khG(BVf0
zf(?RfB0m~PkkA_>P=d7%qYkAbT{@)L7EOzq@<WJ-c1nLav4e$LMG=tN_IyvM`geC`
z-`>ypp6@y5-hKP_nO^bHF43JU0*A)#c9{1i>0dhX3My^GFooj{!!WD}T}*!+uEKf9
zq7T!4n?K~g>BCy1Q)M{tK@#h8$!J}mOVY&IFh5TjNi!B>S!nBT%RqJ)C0ZB707CK}
zz<Uf%`D49LMrw|s=KCB9$V<@w$q<s`90VUQgynNkK4d782LV?YqVicm@DW2yPSd&0
zNaz&w>mtuIj9U2;I^Pf#1PyWlx_v5&2wJ3HuXUcUjnVY>DfVZ{M$+xm41Vbayv~p-
zZ%|G93`0OpA-{c=AtYacGQ<#;0W0xz@&w^|AKtsnBh=h4>-5{IJ;b%=acH(&2EC4<
zT7C~u&rmDdb-OEH4C&`xx#lHXpKt}Uk72~M<^UD*O0K+)lhb9VcBS|#k3x^Lp37Ub
z+gK0CVY1lmtb}AU(jI3BOCMkZLy>IM-${wYd8Q6_R>=>cZ()75+yL0hP%Xz`+D?Yr
zk<q)@Q!gh$*~ZHKG75Nt;XyeH1-3IZ$aW~*>{%plV!|Czbe7v2>cwGdPHdK)NbKRn
z7CD)22YV+gt+Gtlx_zOY(0f_mD2D*MS?`cf0rs%cB~R!bZl8EZA8<dKIt{`>&hpD~
zwvKv&p>7O!h+|>-G6wh=Ly>ggdrmM!rB}Cms{I#H;3$V`Wd>$?k)dARu=RVM;`pCX
z;3bYNmQ~1pnPI7%fIb5Z&GIndHw-N@0ncw4T4fGA#~IeiYk*f6+T=laUS-%QlhOM%
zh7P$5r#J}Eds1^e!>D(XwO)BtA5YB-nJ9FIL(j=%z*&Z$$R(&c#PEU~)}y@@Vu!Bx
zmV3@XC{My|XUTlM&+8NCb-y=UJqPy6q;tuJ;oe0_qLNY!Ix9o$^(;W(E(EUAFH`K@
zq6{PTKM3B9Ujts=-;weH#f?$Nb<wD@c!QH<A6*`xl3AQ%7=NH7lNwVv$+DL$Z!t`#
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zo>(`BWR!ZDPPr8oEqR$Nwsn9c2R#a>lh?XHms^jz1LRC9SxBn2pSmT@ScT>7I+9ir
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zMKf80w=B=-kJAF*3SpE}9LgFgf11IsI-tDHkgL3Ko?!^6S%9+)A@wE>V~8QFA{gTh
zh9bii(5px1#)na-)x?~Zx&m0k;8e#j+oKFA>I9Uv3|{pa>Z~)dopkjtIzsC)R<hJz
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z5?N0&tW&d4ZWlwF8iTIAY}%;aL51C{bf_N!_OQ~W-g4=O#$?5>A=bwUy@snEqwF)s
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zrv66O*!VRRxr%%-Kgec=hw1Sc<Y^eU65iIhvhh~x0Mr`#n#Ct>y1q&1e-^u76!!)D
zvEOT(s39KH{yCqcSP;B|eO%8X-(=GW8yWAycw;<qFpfDtolMIHx_PpB?3@1^JJ_Sg
z`Zm|sVBm=lP>xOiLxz!7Moa%fIA=9~5yfHnpGM!co4<(S^g_R<sG~~mqOcsK3KL#T
z-1JqrqJ@iBENd!kq3gm`g$q|MTD@fXih{cOdn3iw(ZW@0R<$%OE4+oRt%Y?fR<CSq
zN=yx27m0ZOTS<}s!=9+0bV($-3R)fJ<(PIv=b9hK^!(^tVd?$R8j-HA(zQDAwJFnu
z*sC{{)R^bW^!buU#8Q24X^rU7eWjDc6g^lvUikDsO7qR(DxDF_Gyhto?~LV%MY<`L
ZPs%pB&eK1q>tX%J7-h{#ILdNH{};b?FyR0I

delta 3039
zcmb`I{Zo|J702&=_IdU$cVAc#ft57_x(lnWEV3&vN-H8Yq;7=7O-vJGp+LkIgyE$D
zrLGvYh{QmyMzq4Tagvxx9kn}CNp0GcNGla15;acJnK)CYBR@2$jZKL5?VLku@&}X|
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zVS>OTmV)27OyCp!s7w<0#V4lN&*Bzv$D3H_LG27QcZ&zqb=l>k+K*DGOcbELjvy>b
z5F!K>BCNWsS$t5vZcW!rW_7{pO?w|l+@_5{F{hx)os^s;jw!3nRWgZsl=O7kqOpT?
zkGKgIql*-uSdM8s3H;(F_I!>YM`WvKY{4ka)J@J(5eKJl>?OTS`~;mn1YvOl_q&gv
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zl-Md(<3I;VX%~;E3cJf!iTVKPyTl;EVbZ(B_Ysbe(kuR~`t2@$LcL+%8gD`21ZBC!
zUv(97czwrlcc&@l7ri*ZF9>pk8UM~Pf{^g3E=SlM!vepeP=(0Gna&bKM1omOIdY?~
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zeV(9OG~g+YA*dtqa~&tK#5idKVz(NN&-7iy&;*5!iz^7134Sg@Sap)%l=!Eb<t*kK
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BJy`$%

diff --git a/system/STM32L4xx/Lib/boot_stm32l476.o b/system/STM32L4xx/Lib/boot_stm32l476.o
index 14d08e723de55e2545034a508e62894d5107ada1..4f7ec2b6031adf19bfc50faf5d2acba94476d340 100644
GIT binary patch
delta 2934
zcmai#e{fXQ702Iw``+FSx!GNkkZd*^UB+Zta6=Xo$OdRl6lo|y5@9e^)MN+_C_jRP
zk`^ZGSOhwa403}b4Vi)tV`tK7l@&XR15+!?q5*{%0p&+AR+v$N3JD=ld%kBK@xNv!
zckkzX&-a}3Zr<LU=@ftK6q|#h`L)q+I?Z;6{@fWVUS}JIDV!G!!?4O}F#~h33fGWD
zAEq6IZpupfu=eT_8Mz|@LAW*}a+}jI9OJ5CzD!|9)go+H=r&oDf6zhO^Wq&u<Ql*Q
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z8p>P~A=5BwWgj{ZiAsV7xf9BD5hZAmkLgZV-~8Xw0Cvjnlij4-SGZU})&s6G1m#4)
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kn{^|t5&e5wgZedEoAe1<yR?`*Ml|cOwC+gMP2QCCKLkiIl>h($

delta 2982
zcmbW2e{fXQ702Iwc`tV%H@h1WlHKG*lOe2|ur!MaNfc1fh@k|tiY?H>Oj4j`+XP|~
z$tp-v%FyV<40_X!EkDPWQKpU-qtg+U)?Yw?@Ixa%6a;~EuyzF0B!oci`JQ#eznhud
zy`S?v-*e8rdHeG6261|WSf3-d?#O*T(OhrqlZk<eRkmT6BJp#>FsxEqOlK}u;d;-a
z57YjFKV%Z6S?hG642>H~VEyNalq4EPLO})0Z&G5yj9P4`>eX_5mZm)Gf_MiJxf1X>
zgG+ALyJS(-2V}6m<WQdc3i?HcpnROFT9+6?@?|KO8N%{az*h{#vPTen%}^$Ptf#w*
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ztkyG=4x1+uv`^hE?$Ko`aF-vR-R3)_d!-l2dl=GWKgQk5;FAaG>~;@>Bh%p7$B-lI
z^j781dK}5U916(*;2=X-uF!p|DB6a~AMzOGayI;ZtXIfWNdAbSQU;NBlp!LY1RP_}
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Mv>xuxy}dK_e=TQ7hX4Qo

diff --git a/system/STM32L4xx/Lib/boot_stm32l496.o b/system/STM32L4xx/Lib/boot_stm32l496.o
index aabbe79de48fda5b8693d8174764852ec49cdae8..d86df5549c250a6f8697c61a70c15e25e8512ecc 100644
GIT binary patch
delta 3010
zcmai$e^6A{702Iw``+F~?*2f2E$l;Ag=N82wt%>-D4-0Y#lQ$gZLOnGJJJGLCDBYw
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delta 3058
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diff --git a/system/STM32L4xx/Lib/libstm32l432.a b/system/STM32L4xx/Lib/libstm32l432.a
index 77057ec35320a190ad08844e82cb41817513c11d..316c4cd8d07bc87427f3d5cd33c0bec54cf788cd 100644
GIT binary patch
delta 6103
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JlI_QK{{_>3RdN6T

delta 4793
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diff --git a/system/STM32L4xx/Lib/libstm32l433.a b/system/STM32L4xx/Lib/libstm32l433.a
index 9a3eb630dd61388aec1fa9463adb682288094647..0bf071a9328200d0222f49a523ee34fe7bfee6ee 100644
GIT binary patch
delta 6138
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delta 4940
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diff --git a/system/STM32L4xx/Lib/libstm32l476.a b/system/STM32L4xx/Lib/libstm32l476.a
index 639ffb5bc6497b9b3a6b96e1b311f2480dd3a285..1f29ed4a0b349c4c051aa1dc2517b649deda9af5 100644
GIT binary patch
delta 6391
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delta 5254
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diff --git a/system/STM32L4xx/Lib/libstm32l496.a b/system/STM32L4xx/Lib/libstm32l496.a
index 3b8f4d8417ccc8670f5ef3d3f56e153d6126a2c1..fde2f242197e98239f53eab77cb40d9b368c5301 100644
GIT binary patch
delta 6372
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YpK^R9yPR>{I?(JZ+2rYqRzvLn02%ivXaE2J

diff --git a/system/STM32L4xx/Source/stm32l4_adc.c b/system/STM32L4xx/Source/stm32l4_adc.c
index 55681a9a..011b753a 100644
--- a/system/STM32L4xx/Source/stm32l4_adc.c
+++ b/system/STM32L4xx/Source/stm32l4_adc.c
@@ -282,10 +282,10 @@ bool stm32l4_adc_calibrate(stm32l4_adc_t *adc)
     return true;
 }
 
-uint32_t stm32l4_adc_convert(stm32l4_adc_t *adc, unsigned int channel)
+uint32_t stm32l4_adc_convert(stm32l4_adc_t *adc, unsigned int channel, unsigned int period)
 {
     ADC_TypeDef *ADCx = adc->ADCx;
-    uint32_t convert, adc_smp;
+    uint32_t convert, threshold, adcclk, adc_smp;
 
     if (adc->state != ADC_STATE_READY)
     {
@@ -296,51 +296,64 @@ uint32_t stm32l4_adc_convert(stm32l4_adc_t *adc, unsigned int channel)
      * calibration and first conversion or between 2 consecutive conversions is too long. 
      */
 
-    if ((adc->instance == ADC_INSTANCE_ADC1) &&
-	((channel == ADC_CHANNEL_ADC1_TS) || (channel == ADC_CHANNEL_ADC1_VBAT) || (channel == ADC_CHANNEL_ADC1_VREFINT)))
+    if ((adc->instance == ADC_INSTANCE_ADC1) && (channel == ADC_CHANNEL_ADC1_TS))
     {
-	if (channel == ADC_CHANNEL_ADC1_TS)
-	{
-	    ADCx->CR |= ADC_CR_ADDIS;
+	ADCx->CR |= ADC_CR_ADDIS;
 
-	    while (ADCx->CR & ADC_CR_ADEN)
-	    {
-	    }
+	while (ADCx->CR & ADC_CR_ADEN)
+	{
+	}
 	    
 #if defined(STM32L476xx) || defined(STM32L496xx)
-  	    armv7m_atomic_or(&ADC123_COMMON->CCR, ADC_CCR_TSEN);
+	armv7m_atomic_or(&ADC123_COMMON->CCR, ADC_CCR_TSEN);
 #else /* defined(STM32L476xx) || defined(STM32L496xx) */
-  	    armv7m_atomic_or(&ADC1_COMMON->CCR, ADC_CCR_TSEN);
+	armv7m_atomic_or(&ADC1_COMMON->CCR, ADC_CCR_TSEN);
 #endif /* defined(STM32L476xx) || defined(STM32L496xx) */
 
-	    ADCx->ISR = ADC_ISR_ADRDY;
-
-	    do
-	    {
-		ADCx->CR |= ADC_CR_ADEN;
-	    }
-	    while (!(ADCx->ISR & ADC_ISR_ADRDY));
-
-	    armv7m_core_udelay(120);
+	ADCx->ISR = ADC_ISR_ADRDY;
 
-	    /* min time is 5us */
-	    adc_smp = ADC_SAMPLE_TIME_247_5;
-	}
-	else if (channel == ADC_CHANNEL_ADC1_VBAT)
-	{
-	    /* min time is 12us */
-	    adc_smp = ADC_SAMPLE_TIME_640_5;
-	}
-	else
+	do
 	{
-	  adc_smp = ADC_SAMPLE_TIME_47_5;
+	    ADCx->CR |= ADC_CR_ADEN;
 	}
+	while (!(ADCx->ISR & ADC_ISR_ADRDY));
+
+	armv7m_core_udelay(120);
+    }
+
+    if ((stm32l4_system_hclk() <= 48000000) && (stm32l4_system_hclk() == stm32l4_system_sysclk()))
+    {
+	adcclk = stm32l4_system_hclk();
     }
     else
     {
-	adc_smp = ADC_SAMPLE_TIME_47_5;
+	adcclk = stm32l4_system_hclk() / 2;
     }
 
+    /* period is in uS. 1e6 / adcclk is one tick in terms of uS.
+     *
+     * (period * adcclk) / 1e6 is the threshold for the sampling time.
+     *
+     * The upper limit for period is 50uS, and adcclk limited to 48MHz,
+     * which means no overflow handling is needed.
+     */
+
+    if (period > 50)
+    {
+        period = 50;
+    }
+    
+    threshold = ((uint32_t)period * adcclk);
+
+    if      (threshold < (uint32_t)(  2.5 * 1e6)) { adc_smp = ADC_SAMPLE_TIME_2_5;   } 
+    else if (threshold < (uint32_t)(  6.5 * 1e6)) { adc_smp = ADC_SAMPLE_TIME_6_5;   } 
+    else if (threshold < (uint32_t)( 12.5 * 1e6)) { adc_smp = ADC_SAMPLE_TIME_12_5;  } 
+    else if (threshold < (uint32_t)( 24.5 * 1e6)) { adc_smp = ADC_SAMPLE_TIME_24_5;  } 
+    else if (threshold < (uint32_t)( 47.5 * 1e6)) { adc_smp = ADC_SAMPLE_TIME_47_5;  } 
+    else if (threshold < (uint32_t)( 92.5 * 1e6)) { adc_smp = ADC_SAMPLE_TIME_92_5;  } 
+    else if (threshold < (uint32_t)(247.5 * 1e6)) { adc_smp = ADC_SAMPLE_TIME_247_5; } 
+    else                                          { adc_smp = ADC_SAMPLE_TIME_640_5; } 
+
     ADCx->SQR1 = (channel << 6);
     ADCx->SMPR1 = (channel < 10) ? (adc_smp << (channel * 3)) : 0;
     ADCx->SMPR2 = (channel >= 10) ? (adc_smp << ((channel * 3) - 30)) : 0;

From ed5e31fcaa54936ea7730f061c354e3e0f29a2f8 Mon Sep 17 00:00:00 2001
From: Thomas Roell <grumpyoldpizza@gmail.com>
Date: Mon, 17 Sep 2018 21:30:07 -0600
Subject: [PATCH 3/5] make "config" for Hardware serial a uint32_t type

---
 cores/stm32l4/CDC.cpp          | 4 ++--
 cores/stm32l4/HardwareSerial.h | 2 +-
 cores/stm32l4/USBAPI.h         | 2 +-
 cores/stm32l4/Uart.cpp         | 4 ++--
 cores/stm32l4/Uart.h           | 4 ++--
 5 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/cores/stm32l4/CDC.cpp b/cores/stm32l4/CDC.cpp
index aa5ee0bc..fbca22ee 100644
--- a/cores/stm32l4/CDC.cpp
+++ b/cores/stm32l4/CDC.cpp
@@ -72,10 +72,10 @@ CDC::CDC(struct _stm32l4_usbd_cdc_t *usbd_cdc, bool serialEvent)
 
 void CDC::begin(unsigned long baudrate)
 {
-    begin(baudrate, (uint8_t)SERIAL_8N1);
+    begin(baudrate, SERIAL_8N1);
 }
 
-void CDC::begin(unsigned long baudrate, uint16_t config)
+void CDC::begin(unsigned long baudrate, uint32_t config)
 {
     /* If USBD_CDC has already been enabled/initialized by STDIO, just add the notify.
      */
diff --git a/cores/stm32l4/HardwareSerial.h b/cores/stm32l4/HardwareSerial.h
index 655bc84b..7f8d35f2 100644
--- a/cores/stm32l4/HardwareSerial.h
+++ b/cores/stm32l4/HardwareSerial.h
@@ -57,7 +57,7 @@ class HardwareSerial : public Stream
 {
   public:
     virtual void begin(unsigned long);
-    virtual void begin(unsigned long baudrate, uint16_t config);
+    virtual void begin(unsigned long baudrate, uint32_t config);
     virtual void end();
     virtual int available(void) = 0;
     virtual int peek(void) = 0;
diff --git a/cores/stm32l4/USBAPI.h b/cores/stm32l4/USBAPI.h
index d4ccde73..479dc638 100644
--- a/cores/stm32l4/USBAPI.h
+++ b/cores/stm32l4/USBAPI.h
@@ -59,7 +59,7 @@ class CDC : public HardwareSerial
 public:
     CDC(struct _stm32l4_usbd_cdc_t *usbd_cdc, bool serialEvent);
     void begin(unsigned long baudRate);
-    void begin(unsigned long baudrate, uint16_t config);
+    void begin(unsigned long baudrate, uint32_t config);
     void end(void);
 
     int available(void);
diff --git a/cores/stm32l4/Uart.cpp b/cores/stm32l4/Uart.cpp
index 102caa69..c56c3284 100644
--- a/cores/stm32l4/Uart.cpp
+++ b/cores/stm32l4/Uart.cpp
@@ -61,7 +61,7 @@ void Uart::begin(unsigned long baudrate)
     begin(baudrate, SERIAL_8N1, &_rx_data[0], sizeof(_rx_data));
 }
 
-void Uart::begin(unsigned long baudrate, uint16_t config)
+void Uart::begin(unsigned long baudrate, uint32_t config)
 {
     begin(baudrate, config, &_rx_data[0], sizeof(_rx_data));
 }
@@ -71,7 +71,7 @@ void Uart::begin(unsigned long baudrate, uint8_t *buffer, size_t size)
     begin(baudrate, SERIAL_8N1, buffer, size);
 }
 
-void Uart::begin(unsigned long baudrate, uint16_t config, uint8_t *buffer, size_t size)
+void Uart::begin(unsigned long baudrate, uint32_t config, uint8_t *buffer, size_t size)
 {
     if (_uart->state != UART_STATE_INIT) {
 	flush();
diff --git a/cores/stm32l4/Uart.h b/cores/stm32l4/Uart.h
index 3a3bf42e..20ed7de0 100644
--- a/cores/stm32l4/Uart.h
+++ b/cores/stm32l4/Uart.h
@@ -38,9 +38,9 @@ class Uart : public HardwareSerial
 public:
     Uart(struct _stm32l4_uart_t *uart, unsigned int instance, const struct _stm32l4_uart_pins_t *pins, unsigned int priority, unsigned int mode, bool serialEvent);
     void begin(unsigned long baudRate);
-    void begin(unsigned long baudrate, uint16_t config);
+    void begin(unsigned long baudrate, uint32_t config);
     void begin(unsigned long baudRate, uint8_t *buffer, size_t size);
-    void begin(unsigned long baudrate, uint16_t config, uint8_t *buffer, size_t size);
+    void begin(unsigned long baudrate, uint32_t config, uint8_t *buffer, size_t size);
     void end();
     int available();
     int availableForWrite(void);

From 7548c239e625337e0db0a9f416ad7cc1d82f1579 Mon Sep 17 00:00:00 2001
From: Thomas Roell <grumpyoldpizza@gmail.com>
Date: Mon, 17 Sep 2018 21:39:12 -0600
Subject: [PATCH 4/5] Fix _tx_active handling for Wire Slave

---
 libraries/Wire/src/Wire.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libraries/Wire/src/Wire.cpp b/libraries/Wire/src/Wire.cpp
index 35b43d8c..b5fb7fa9 100644
--- a/libraries/Wire/src/Wire.cpp
+++ b/libraries/Wire/src/Wire.cpp
@@ -404,10 +404,13 @@ void TwoWire::EventCallback(uint32_t events)
     
 	if (events & I2C_EVENT_TRANSMIT_REQUEST) {
 	    _tx_write = 0;
+	    _tx_active = true;
 
 	    if(_requestCallback) {
 		(*_requestCallback)();
 	    }
+
+	    _tx_active = false;
       
 	    stm32l4_i2c_service(_i2c, &_tx_data[0], _tx_write);
 	}

From ac659033eadd50cfe001ba1590a1362b2d87bb76 Mon Sep 17 00:00:00 2001
From: Thomas Roell <grumpyoldpizza@gmail.com>
Date: Sun, 30 Dec 2018 06:07:21 -0700
Subject: [PATCH 5/5] Remove CMSIS-DAP from STM32L433-Butterfly

---
 boards.txt                                 | 4 ----
 cores/stm32l4/stm32l4_wiring_analog.c      | 9 +++++++--
 variants/STM32L433CC-Butterfly/variant.cpp | 5 -----
 variants/STM32L433CC-Butterfly/variant.h   | 3 ---
 4 files changed, 7 insertions(+), 14 deletions(-)

diff --git a/boards.txt b/boards.txt
index f1f78147..805a5895 100644
--- a/boards.txt
+++ b/boards.txt
@@ -229,10 +229,6 @@ Butterfly-L433CC.menu.usb.cdc_hid=Serial + Keyboard + Mouse
 Butterfly-L433CC.menu.usb.cdc_hid.build.usb_type=USB_TYPE_CDC_HID
 Butterfly-L433CC.menu.usb.cdc_msc_hid=Serial + Mass Storage + Keyboard + Mouse
 Butterfly-L433CC.menu.usb.cdc_msc_hid.build.usb_type=USB_TYPE_CDC_MSC_HID
-Butterfly-L433CC.menu.usb.cdc_dap=Serial + CMSIS-DAP
-Butterfly-L433CC.menu.usb.cdc_dap.build.usb_type=USB_TYPE_CDC_DAP
-Butterfly-L433CC.menu.usb.cdc_msc_dap=Serial + Mass Storage + CMSIS-DAP
-Butterfly-L433CC.menu.usb.cdc_msc_dap.build.usb_type=USB_TYPE_CDC_MSC_DAP
 Butterfly-L433CC.menu.usb.none=No USB
 Butterfly-L433CC.menu.usb.none.build.usb_type=USB_TYPE_NONE
 
diff --git a/cores/stm32l4/stm32l4_wiring_analog.c b/cores/stm32l4/stm32l4_wiring_analog.c
index 351e60cd..ef6f7a2c 100644
--- a/cores/stm32l4/stm32l4_wiring_analog.c
+++ b/cores/stm32l4/stm32l4_wiring_analog.c
@@ -49,6 +49,8 @@ static uint32_t _writeRange[PWM_INSTANCE_COUNT];
 
 static uint8_t _writeCalibrate = 3;
 
+bool _analogReadFast = false;
+
 void analogReference(eAnalogReference reference)
 {
     (void)reference;
@@ -115,7 +117,7 @@ uint32_t analogRead(uint32_t pin)
 	stm32l4_adc_enable(&stm32l4_adc, 0, NULL, NULL, 0);
 	stm32l4_adc_calibrate(&stm32l4_adc);
     }
-    else
+    else if (stm32l4_adc.state != ADC_STATE_READY)
     {
 	stm32l4_adc_enable(&stm32l4_adc, 0, NULL, NULL, 0);
     }
@@ -124,7 +126,10 @@ uint32_t analogRead(uint32_t pin)
 
     input = stm32l4_adc_convert(&stm32l4_adc, g_APinDescription[pin].adc_input, _readPeriod);
 
-    stm32l4_adc_disable(&stm32l4_adc);
+    if (!_analogReadFast)
+    {
+	stm32l4_adc_disable(&stm32l4_adc);
+    }
 
     return mapResolution(input, 12, _readResolution);
 }
diff --git a/variants/STM32L433CC-Butterfly/variant.cpp b/variants/STM32L433CC-Butterfly/variant.cpp
index 37bb0e42..eff7126e 100644
--- a/variants/STM32L433CC-Butterfly/variant.cpp
+++ b/variants/STM32L433CC-Butterfly/variant.cpp
@@ -45,13 +45,8 @@ extern const PinDescription g_APinDescription[NUM_TOTAL_PINS] =
     { GPIOB, GPIO_PIN_MASK(GPIO_PIN_PB12), GPIO_PIN_PB12,            (PIN_ATTR_EXTI),                                 PWM_INSTANCE_NONE,  PWM_CHANNEL_NONE, ADC_INPUT_NONE },
     { GPIOB, GPIO_PIN_MASK(GPIO_PIN_PB13), GPIO_PIN_PB13_TIM15_CH1N, (PIN_ATTR_PWM | PIN_ATTR_EXTI),                  PWM_INSTANCE_TIM15, PWM_CHANNEL_1,    ADC_INPUT_NONE },
     { GPIOB, GPIO_PIN_MASK(GPIO_PIN_PB14), GPIO_PIN_PB14_TIM1_CH2N,  (PIN_ATTR_PWM | PIN_ATTR_EXTI),                  PWM_INSTANCE_TIM1,  PWM_CHANNEL_2,    ADC_INPUT_NONE },
-#if (USBD_TYPE == USBD_TYPE_CDC_DAP) || (USBD_TYPE == USBD_TYPE_CDC_MSC_DAP)
-    { NULL,  GPIO_PIN_MASK(GPIO_PIN_PB15), GPIO_PIN_PB15,            0,                                               PWM_INSTANCE_NONE,  PWM_CHANNEL_NONE, ADC_INPUT_NONE },
-    { NULL,  GPIO_PIN_MASK(GPIO_PIN_PB8),  GPIO_PIN_PB8,             0,                                               PWM_INSTANCE_NONE,  PWM_CHANNEL_NONE, ADC_INPUT_NONE },
-#else /* (USBD_TYPE == USBD_TYPE_CDC_DAP) || (USBD_TYPE == USBD_TYPE_CDC_MSC_DAP) */
     { GPIOB, GPIO_PIN_MASK(GPIO_PIN_PB15), GPIO_PIN_PB15_TIM1_CH3N,  (PIN_ATTR_PWM | PIN_ATTR_EXTI),                  PWM_INSTANCE_TIM1,  PWM_CHANNEL_3,    ADC_INPUT_NONE },
     { GPIOB, GPIO_PIN_MASK(GPIO_PIN_PB8),  GPIO_PIN_PB8_TIM16_CH1,   (PIN_ATTR_PWM | PIN_ATTR_EXTI),                  PWM_INSTANCE_TIM16, PWM_CHANNEL_1,    ADC_INPUT_NONE },
-#endif /* (USBD_TYPE == USBD_TYPE_CDC_DAP) || (USBD_TYPE == USBD_TYPE_CDC_MSC_DAP) */
     { GPIOB, GPIO_PIN_MASK(GPIO_PIN_PB9),  GPIO_PIN_PB9,             (PIN_ATTR_EXTI),                                 PWM_INSTANCE_NONE,  PWM_CHANNEL_NONE, ADC_INPUT_NONE },
     { GPIOA, GPIO_PIN_MASK(GPIO_PIN_PA15), GPIO_PIN_PA15_TIM2_CH1,   (PIN_ATTR_PWM | PIN_ATTR_EXTI),                  PWM_INSTANCE_TIM2,  PWM_CHANNEL_1,    ADC_INPUT_NONE },
     { GPIOA, GPIO_PIN_MASK(GPIO_PIN_PA2),  GPIO_PIN_PA2_TIM2_CH3,    (PIN_ATTR_PWM | PIN_ATTR_EXTI | PIN_ATTR_WKUP4), PWM_INSTANCE_TIM2,  PWM_CHANNEL_3,    ADC_INPUT_NONE },
diff --git a/variants/STM32L433CC-Butterfly/variant.h b/variants/STM32L433CC-Butterfly/variant.h
index 7dbf8475..6b61b4be 100644
--- a/variants/STM32L433CC-Butterfly/variant.h
+++ b/variants/STM32L433CC-Butterfly/variant.h
@@ -41,9 +41,6 @@
 #define STM32L4_CONFIG_SYSOPT             0
 #define STM32L4_CONFIG_USB_VBUS           GPIO_PIN_PB2
 
-#define STM32L4_CONFIG_DAP_SWCLK          GPIO_PIN_PB15
-#define STM32L4_CONFIG_DAP_SWDIO          GPIO_PIN_PB8
-
 #define USBCON
 
 /** Master clock frequency */