midi melody start on button PD3/GND

ch32v003/gpio.h

@@ -14,6 +14,11 @@ enum GPIO_CNF : uint32_t {
   GPIO_UPDI_MPPO = 2u << 2,
   GPIO_none_MPDO = 3u << 2,
 };
+enum GPIOPuPd_TypeDef {
+  GPIO_PuPd_NOPULL = 0x00,
+  GPIO_PuPd_UP     = 0x01,
+  GPIO_PuPd_DOWN   = 0x02
+};
 
 class GpioClass {
   GPIOA_Type   & port;
@@ -42,6 +47,10 @@ class GpioClass {
     operator bool () const {
       return port.INDR.R & (1u << pin);
     }
+    void setPuPd (GPIOPuPd_TypeDef p) {
+      if (p != GPIO_PuPd_UP) return;
+      port.OUTDR.R |= 1u << pin;
+    }
 };
 
 #endif // _GPIO_CLASS_H_

midi/midiplayer.cpp

@@ -48,11 +48,12 @@ static unsigned pwm_sd (const int input) {
 
 /******************************************************************/
 /// Konstruktor
-MidiPlayer::MidiPlayer() noexcept : OneWay(), led (LED_CFG), passcnt (0u) {
+MidiPlayer::MidiPlayer() noexcept : OneWay(), led (LED_CFG), but (BUT_CFG), passcnt (0u) {
   index = 0;
   pause = 0;
   melody  = scores[index++];
-  running = true;
+  running = false;
+  but.setPuPd (GPIO_PuPd_UP);
 }
 void MidiPlayer::pass() {
   const bool b = passcnt & 0x10000;
@@ -61,7 +62,8 @@ void MidiPlayer::pass() {
 }
 
 unsigned MidiPlayer::Send (uint16_t * const ptr, const unsigned len) {
-//if (!but.get()) running = true;  // případně spouštět tlačítkem, není implementováno
+  const bool b = but;
+  if (!b and !running) running = true;
   
   if (!running) {
     for (unsigned n=0; n<len; n++) ptr [n] = MAXPWM >> 1;
@@ -75,7 +77,7 @@ unsigned MidiPlayer::Send (uint16_t * const ptr, const unsigned len) {
   return len;
 }
 void MidiPlayer::stop (void) {
-//running = false;                // na konci každé melodie stop
+  running = false;                // na konci každé melodie stop
   melody = scores[index++];
   if (!melody) {
     index   = 0;

midi/midiplayer.h

@@ -19,7 +19,7 @@ class MidiPlayer : public OneWay {
     /// Obsluha vzorku
     short nextSample (void);
   private:
-    GpioClass             led;
+    GpioClass             led, but;
     unsigned              passcnt;
     volatile bool         running;
     unsigned char const * melody;

midi/pwmconfig.h

@@ -4,10 +4,12 @@
 static constexpr unsigned HALF_LEN = 0x80u;
 static constexpr unsigned MAXPWM   = 2000u;
 
-#ifdef __riscv
+#if __riscv
 #define LED_CFG GPIOD,4
+#define BUT_CFG GPIOD,3,(GPIO_Speed_In | GPIO_UPDI_MPPO)
 #elif __arm__
 #define LED_CFG GpioPortA,0
+#define BUT_CFG GpioPortA,3,GPIO_Mode_IN
 #else
 #error "bad target"
 #endif

stm32f051/gpio.h

@@ -91,13 +91,16 @@ class GpioClass {
     /// Načti logickou hodnotu na pinu
     const bool get (void) const {
       if (io->IDR.R & pos) return true;
-      else               return false;
+      else                 return false;
     };
     /// A to samé jako operátor
     const GpioClass& operator>> (bool& b) const {
       b = get();
       return *this;
     }
+    operator bool () const {
+      return get();
+    }
 //![Gpio example]
     void setMode (GPIOMode_TypeDef p) {
       uint32_t dno = num * 2;