pwm/Makefile

@@ -1,55 +0,0 @@
-# ch32v003
-TARGET?= ch32v003
-TOOL  ?= gcc
-#TOOL  ?= clang
-
-
-PRJ    = example
-
-VPATH  = . ./$(TARGET)
-BLD    = ./build/
-DFLAGS = -d
-LFLAGS = -g
-LDLIBS =
-BFLAGS = --strip-unneeded
-
-CFLAGS = -MMD -Wall -ggdb -fno-exceptions -ffunction-sections -fdata-sections
-CFLAGS+= -I. -I./$(TARGET) -I/usr/include/newlib
-DEL    = rm -f
-
-# zdrojaky
-OBJS   = main.o pwmclass.o generator.o sin.o
-
-include $(TARGET)/$(TOOL).mk
-BOBJS = $(addprefix $(BLD),$(OBJS))
-
-all: $(BLD) $(PRJ).elf
-# ... atd.
--include $(BLD)*.d
-# linker
-$(PRJ).elf: $(BOBJS)
-	-@echo [LD $(TOOL),$(TARGET)] $@
-	@$(LD) $(LFLAGS) -o $(PRJ).elf $(BOBJS) $(LDLIBS)
-	-@echo "size:"
-	@$(SIZE) $(PRJ).elf
-	-@echo "listing:"
-	$(DUMP) $(DFLAGS) $(PRJ).elf > $(PRJ).lst
-	-@echo "OK."
-	$(COPY) $(BFLAGS) -O binary $(PRJ).elf $(PRJ).bin
-# preloz co je potreba
-$(BLD)%.o: %.c
-	-@echo [CC $(TOOL),$(TARGET)] $@
-	@$(CC) -c $(CFLAGS) $< -o $@
-$(BLD)%.o: %.cpp
-	-@echo [CX $(TOOL),$(TARGET)] $@
-	@$(CXX) -std=c++17 -fno-rtti -c $(CFLAGS) $< -o $@
-$(BLD):
-	mkdir $(BLD)
-sin.c: sin.py
-	./sin.py
-flash: $(PRJ).elf
-	minichlink -w $(PRJ).bin flash -b
-# vycisti
-clean:
-	$(DEL) $(BLD)* *.lst *.bin *.elf *.map sin.c *~
-.PHONY: all clean

pwm/ch32v003

@@ -1 +0,0 @@
-../ch32v003/

pwm/generator.cpp

@@ -1,13 +0,0 @@
-#include "generator.h"
-
-extern "C" const uint16_t sin_tab[0x100];
-
-uint16_t Generator::step() {
-  const uint16_t v = sin_tab [base >> 24];
-  base += freq;
-  return v;
-}
-unsigned int Generator::Send(uint16_t * const ptr, const unsigned int len) {
-  for (unsigned n=0u; n<len; n++) ptr [n] = step();
-  return len;
-}

pwm/generator.h

@@ -1,14 +0,0 @@
-#ifndef GENERATOR_H
-#define GENERATOR_H
-#include "oneway.h"
-/* Něco jako DDS, přesná frekvence není řešena (závisí na TIM1). */
-class Generator : public OneWay {
-  unsigned base, freq;
-  public:
-    explicit Generator (const unsigned f) noexcept : OneWay(), base(0u), freq (f) {};
-    unsigned Send (uint16_t * const ptr, const unsigned len) override;
-  protected:
-    uint16_t step ();
-};
-
-#endif // GENERATOR_H

pwm/main.cpp

@@ -1,16 +0,0 @@
-#include "pwmclass.h"
-#include "generator.h"
-//////////////////////////////////////
-/* Demonstrace PWM s použitím DMA
- * Generátor je sinus, data se tvoří
- * v přerušení. Parametry se musí nastavit
- * ve zdrojácích, je to jen DEMO.
- * */
-//////////////////////////////////////
-static  PwmClass  pwm;
-static  Generator gen (1u << 16);
-int main () {
-  pwm.attach(gen);
-  for (;;);
-  return 0;
-}

pwm/oneway.h

@@ -1,10 +0,0 @@
-#ifndef ONEWAY_H
-#define ONEWAY_H
-#include <stdint.h>
-/* C++ interface (jako callback v C) */
-class OneWay {
-  public:
-    virtual unsigned Send (uint16_t * const ptr, const unsigned len) = 0;
-};
-
-#endif // ONEWAY_H

pwm/pwmclass.cpp

@@ -1,103 +0,0 @@
-#include "system.h"
-#include "pwmclass.h"
-#include "gpio.h"
-
-static PwmClass * pInstance = nullptr;
-extern "C" void DMA1_Channel5_IRQHandler( void ) __attribute__((interrupt));
-void DMA1_Channel5_IRQHandler( void ) {
-  DMA1_Type::INTFR_DEF state (DMA1.INTFR);
-  DMA1.INTFCR.R = state.R;  // clear all
-  if (!pInstance) return;
-  if      (state.B.HTIF5 != RESET) pInstance->send(false);
-  else if (state.B.TCIF5 != RESET) pInstance->send(true);
-}
-
-/*
- * initialize TIM1 for PWM
- */
-static inline void tim1pwm_init () noexcept {
-	// Enable GPIOD and TIM1
-  RCC.APB2PCENR.modify([] (RCC_Type::APB2PCENR_DEF & r) -> auto {
-    r.B.IOPDEN = SET;
-    r.B.TIM1EN = SET;
-    return r.R;
-  });
-    // PD0 is T1CH1N, PD2 is T1CH1, 10MHz Output alt func, push-pull
-  GPIOD.CFGLR.modify([](GPIOA_Type::CFGLR_DEF & r) -> auto {
-    r.B.CNF0  = 2u;
-    r.B.MODE0 = 1u;
-    r.B.CNF2  = 2u;
-    r.B.MODE2 = 1u;
-    return r.R;
-  });
-	// Reset TIM1 to init all regs
-  RCC.APB2PRSTR.B.TIM1RST = SET;
-  RCC.APB2PRSTR.B.TIM1RST = RESET;
-	// CTLR1: default is up, events generated, edge align
-	// SMCFGR: default clk input is CK_INT
-	// Prescaler 
-  TIM1.PSC.R = 0u;
-	// Auto Reload - sets period
-  TIM1.ATRLR.R = MAXPWM - 1;
-  
-  TIM1.CCER.modify([](TIM1_Type::CCER_DEF & r) -> auto {
-	// Enable CH1N, CH1 output, positive pol
-    r.B.CC1NE = SET;
-    r.B.CC1E  = SET;
-    /*
-    r.B.CC1NP = SET; // active Low
-    r.B.CC1P  = SET;
-    */
-    return r.R;
-  });
-	// CH1 Mode is output, PWM1 (CC1S = 00, OC1M = 110)
-  TIM1.CHCTLR1_Output.modify([](TIM1_Type::CHCTLR1_Output_DEF & r) -> auto {
-    r.B.OC1M = 0x6u;
-    return r.R;
-  });
-	// Enable TIM1 outputs
-  TIM1.BDTR.modify([](TIM1_Type::BDTR_DEF & r) -> auto {
-    r.B.MOE = SET;
-    r.B.DTG = 48u;  // Dead time 1us
-    return r.R;
-  });
-  
-	// Reload immediately + Trigger DMA
-  TIM1.SWEVGR.B.UG     = SET;
-  TIM1.DMAINTENR.B.UDE = SET;
-	// Enable TIM1
-  TIM1.CTLR1.B.CEN     = SET;
-}
-typedef __SIZE_TYPE__ size_t;
-static void dma1ch5_init (void * ptr) {
-	// Enable DMA
-  RCC.AHBPCENR.modify([](RCC_Type::AHBPCENR_DEF & r) -> auto {
-    r.B.SRAMEN = SET;
-    r.B.DMA1EN = SET;
-    return r.R;
-  });
-	// DMA5 can be configured to attach to T1UP
-	// The system can only DMA out at ~2.2MSPS.  2MHz is stable.
-  DMA1.CNTR5.R  = FULL_LEN;
-  DMA1.MADDR5.R = reinterpret_cast<size_t>(ptr);
-  DMA1.PADDR5.R = reinterpret_cast<size_t>(& TIM1.CH1CVR);
-  DMA1.CFGR5.modify([](DMA1_Type::CFGR5_DEF & r) -> auto {
-    r.B.DIR   = SET;                    // MEM2PERIPHERAL
-    r.B.PL    = 2u;                     // High priority.
-    r.B.PSIZE = 1u;                     // 16-bit peripheral
-    r.B.MSIZE = 1u;                     // 16-bit memory
-    r.B.MINC  = SET;                    // Increase memory.
-    r.B.CIRC  = SET;                    // Circular mode.
-    r.B.HTIE  = SET;                    // Half-trigger
-    r.B.TCIE  = SET;                    // Whole-trigger
-    return r.R;
-  });
-  NVIC.EnableIRQ (DMA1_Channel5_IRQn);
-  DMA1.CFGR5.B.EN = SET;
-}
-
-PwmClass::PwmClass() noexcept : pL(buffer), pH(buffer + HALF_LEN), src(nullptr) {
-  pInstance = this;
-  tim1pwm_init ();
-  dma1ch5_init (buffer);
-}

pwm/pwmclass.h

@@ -1,23 +0,0 @@
-#ifndef PWMCLASS_H
-#define PWMCLASS_H
-#include "oneway.h"
-static constexpr unsigned HALF_LEN = 64u;
-static constexpr unsigned FULL_LEN = 2u * HALF_LEN;
-static constexpr unsigned MAXPWM   = 2048u;
-/* Používá TIM1, PWM kanál 1, DMA1 kanál 5, přerušení DMA1_Channel5_IRQHandler */
-class PwmClass {
-  uint16_t * const pL;
-  uint16_t * const pH;
-  uint16_t buffer [FULL_LEN];
-  OneWay * src;
-  public:
-    explicit PwmClass () noexcept;
-    void attach (OneWay & s) { src = & s; }
-    void send (const bool b) {
-      if (!src) return;
-      if (b) src->Send (pH, HALF_LEN);
-      else   src->Send (pL, HALF_LEN);
-    }
-};
-
-#endif // PWMCLASS_H

pwm/sin.py

@@ -1,27 +0,0 @@
-#!/usr/bin/python
-# -*- coding: utf-8 -*-
-
-import math
-
-header = '''/* Generated file */
-#include <stdint.h>
-const uint16_t sin_tab[] = {{{0:s}
-}};
-'''
-
-def generate():
-  s = ''
-  for n in range(0,256):
-    if (n % 16) == 0:
-      s += '\n  '
-    a  = float(n) * math.pi / 128.0
-    v  = int (round (1024.0 * (1.0 + math.sin (a))));
-    s += '{0:+6d},'.format(v)
-  return s
-
-if __name__ == '__main__':
-  s = generate()
-  f = open ('sin.c','w')
-  f.write(header.format(s))
-  f.close()
-