add pot. support; L4 trig; eagle schematic draft

Makefile

@@ -187,7 +187,11 @@ UINCDIR =
 ULIBDIR =
 
 # List all user libraries here
+ifeq ($(TARGET_PLATFORM),L4)
+  ULIBS = -lm
+else
   ULIBS =
+endif
 
 #
 # End of user section

gui/wxmain.cpp

@@ -122,6 +122,12 @@ asm("vsqrt.f64 d0, d0; bx lr");
 return 0;
 }
 
+auto readalt() {
+adcsample_t s;
+asm("svc 3; mov %0, r0" : "=&r"(s));
+return s;
+}
+
 // End stmdspgui header code
 
 )cpp";
@@ -156,7 +162,7 @@ asm("vmov.f32 r1, s0;"
 return 0;
 }
 __attribute__((naked))
-auto tan(double x) {
+auto tan(float x) {
 asm("vmov.f32 r1, s0;"
 	"mov r0, #2;"
 	"svc 1;"
@@ -170,6 +176,12 @@ asm("vsqrt.f32 s0, s0; bx lr");
 return 0;
 }
 
+auto readalt() {
+adcsample_t s;
+asm("push {r4-r6}; svc 3; mov %0, r0; pop {r4-r6}" : "=&r"(s));
+return s;
+}
+
 // End stmdspgui header code
 
 )cpp";
@@ -472,6 +484,11 @@ void MainFrame::prepareEditor()
 
 wxString MainFrame::compileEditorCode()
 {
+    if (m_device == nullptr) {
+        m_status_bar->SetStatusText("Need device connected to compile.");
+        return "";
+    }
+
     if (m_temp_file_name.IsEmpty())
         m_temp_file_name = wxFileName::CreateTempFileName("stmdspgui");
 

source/cordic.cpp

@@ -1,8 +1,8 @@
 #include "cordic.hpp"
 #include "hal.h"
 
-namespace cordic {
 #if !defined(TARGET_PLATFORM_L4)
+namespace cordic {
 
 void init()
 {
@@ -93,16 +93,21 @@ double tan(double x) {
     return tanx;
 }
 
+}
 #else // L4
+#include <cmath>
+namespace cordic {
 
 void init() {}
 
-double mod(double, double) { return 0; }
+float mod(float a, float b) {
+    return a - (b * std::floor(a / b));
+}
 
-double cos(double) { return 0; }
-double sin(double) { return 0; }
-double tan(double) { return 0; }
+float cos(float x) { return std::cos(x); }
+float sin(float x) { return std::sin(x); }
+float tan(float x) { return std::tan(x); }
 
-#endif
 }
+#endif
 

source/cordic.hpp

@@ -6,11 +6,19 @@ namespace cordic {
 
     void init();
 
+#if !defined(TARGET_PLATFORM_L4)
     double mod(double n, double d);
 
     double cos(double x);
     double sin(double x);
     double tan(double x);
+#else
+    float mod(float n, float d);
+
+    float cos(float x);
+    float sin(float x);
+    float tan(float x);
+#endif
 }
 
 #endif // CORDIC_HPP_