avr8 – ページ 4 – Sasapea's Lab

マスターモード専用のＳＰＩライブラリ。スレーブモードはやる気がでたらということで．．．(-_-;)

【サンプルコード (Microchip Studio)】

#include "avr8_spi.h"
#include "avr8_port.h"

#define SPI_SS   Port::PA0 /* for ATtiny202/402 */
#define SPI_MOSI Port::PA1 /* for ATtiny202/402 */
#define SPI_MISO Port::PA2 /* for ATtiny202/402 */
#define SPI_SCK  Port::PA3 /* for ATtiny202/402 */

Spi spi0(SPI0);

int main(void)
{
  sei();
  Clock::setup();

  /* Setup SPI pin's */
  Port::pinMode(SPI_MOSI, OUTPUT, Port::HIGH);
  Port::pinMode(SPI_SCK , OUTPUT, Port::HIGH);
  Port::pinMode(SPI_SS  , OUTPUT, Port::HIGH);

  /* SPI Mode 3, 5MHz */
  spi0.begin(5000000, Spi::MODE_3);

  uint8_t wdata[8] = { ... };
  uint8_t rdata[8];

  /* write and read (exchange) */
  Port::digitalWrite(SPI_SS, Port::LOW);
  spi0.xfer(wdata, rdata, sizeof(wdata));
  Port::digitalWrite(SPI_SS, Port::HIGH);

  /* write */
  Port::digitalWrite(SPI_SS, Port::LOW);
  spi0.write(wdata, sizeof(data);
  Port::digitalWrite(SPI_SS, Port::HIGH);

  /* read */
  Port::digitalWrite(SPI_SS, Port::LOW);
  spi0.read(rdata, sizeof(data);
  Port::digitalWrite(SPI_SS, Port::HIGH);

  return 0;
}

#include "avr8_spi.h"

#include "avr8_port.h"

#define SPI_SS Port::PA0 /* for ATtiny202/402 */

#define SPI_MOSI Port::PA1 /* for ATtiny202/402 */

#define SPI_MISO Port::PA2 /* for ATtiny202/402 */

#define SPI_SCK Port::PA3 /* for ATtiny202/402 */

Spi spi0(SPI0);

int main(void)

{

sei();

Clock::setup();

/* Setup SPI pin's */

Port::pinMode(SPI_MOSI, OUTPUT, Port::HIGH);

Port::pinMode(SPI_SCK , OUTPUT, Port::HIGH);

Port::pinMode(SPI_SS , OUTPUT, Port::HIGH);

/* SPI Mode 3, 5MHz */

spi0.begin(5000000, Spi::MODE_3);

uint8_t wdata[8] = { ... };

uint8_t rdata[8];

/* write and read (exchange) */

Port::digitalWrite(SPI_SS, Port::LOW);

spi0.xfer(wdata, rdata, sizeof(wdata));

Port::digitalWrite(SPI_SS, Port::HIGH);

/* write */

Port::digitalWrite(SPI_SS, Port::LOW);

spi0.write(wdata, sizeof(data);

Port::digitalWrite(SPI_SS, Port::HIGH);

/* read */

Port::digitalWrite(SPI_SS, Port::LOW);

spi0.read(rdata, sizeof(data);

Port::digitalWrite(SPI_SS, Port::HIGH);

return 0;

}

【ライブラリ】

/*
  avr8_spi.h - SPI Driver for Microchip AVR8 Series
 
  Copyright (c) 2025 Sasapea's Lab. All right reserved.
 
  This program is free software: you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation, either version 3 of
  the License, or at your option) any later version.
 
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU General Public License for more details.
 
  You should have received a copy of the GNU General Public License
  along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once

#include "avr8_config.h"
#include "avr8_clock.h"

#if   defined(SPI1)
#define SPI_MAX_CH 2
#elif defined(SPI0)
#define SPI_MAX_CH 1
#else
#define SPI_MAX_CH 0
#endif

class Spi
{
  public:

    /* SPI Mode select */
    typedef enum
    {
      MODE_0 = SPI_MODE_0_gc,  /* SPI Mode 0 */
      MODE_1 = SPI_MODE_1_gc,  /* SPI Mode 1 */
      MODE_2 = SPI_MODE_2_gc,  /* SPI Mode 2 */
      MODE_3 = SPI_MODE_3_gc,  /* SPI Mode 3 */
    } MODE;

    /* Prescaler select */
    typedef enum
    {
      PRESC_DIV2   = SPI_PRESC_DIV4_gc  | SPI_CLK2X_bm,  /* System Clock / 2 */
      PRESC_DIV4   = SPI_PRESC_DIV4_gc,                  /* System Clock / 4 */
      PRESC_DIV8   = SPI_PRESC_DIV16_gc | SPI_CLK2X_bm,  /* System Clock / 8 */
      PRESC_DIV16  = SPI_PRESC_DIV16_gc,                 /* System Clock / 16 */
      PRESC_DIV32  = SPI_PRESC_DIV64_gc | SPI_CLK2X_bm,  /* System Clock / 32 */
      PRESC_DIV64  = SPI_PRESC_DIV64_gc,                 /* System Clock / 64 */
      PRESC_DIV128 = SPI_PRESC_DIV128_gc,                /* System Clock / 128 */
    } PRESC;

    Spi(SPI_t& spi) : _spi(&spi), _ch((&spi - &SPI0) / sizeof(spi))
    {
      _instances[_ch] = this;
    }

    /* virtual */ ~Spi(void)
    {
      end();
      _instances[_ch] = 0;
    }

    bool begin(uint32_t frq, MODE mode = MODE_3)
    {
      static const uint8_t CLKDIV[] = { 2, 4, 8, 16, 32, 64, 128 };
      static const PRESC   PRESCS[] = { PRESC_DIV2, PRESC_DIV4, PRESC_DIV8, PRESC_DIV16, PRESC_DIV32, PRESC_DIV64, PRESC_DIV128 };          
      uint32_t div = Clock::frequency() / (frq ? frq : 1);
      for (uint8_t i = 0; i < sizeof(CLKDIV) / sizeof(CLKDIV[0]); ++i)
      {
        if (div <= CLKDIV[i])
        {
          begin(PRESCS[i], mode);
          return true;
        }
      }
      begin(PRESCS[sizeof(PRESCS) / sizeof(PRESCS[0]) - 1], mode);
      return false;
    }

    void begin(PRESC presc, MODE mode)
    {
      end();
      _spi->INTCTRL = 0;
      _spi->CTRLB   = SPI_SSD_bm | mode;
      _spi->CTRLA   = SPI_MASTER_bm | presc | SPI_ENABLE_bm;
    }

    void end(void)
    {
      _spi->CTRLA = 0;
    }

    void lsbfirst(bool enable = true)
    {
      _spi->CTRLA = (_spi->CTRLA & ~SPI_DORD_bm) | (enable ? SPI_DORD_bm : 0);
    }

    uint8_t xfer(uint8_t data)
    {
      _spi->DATA = data;
      while ((_spi->INTFLAGS & SPI_IF_bm) == 0)
        continue;
      return _spi->DATA;
    }

    uint8_t read(void)
    {
      return xfer(0xFF);
    }

    void write(uint8_t data)
    {
      xfer(data);
    }

    void xfer(const void *wbuf, void *rbuf, size_t len)
    {
      const uint8_t* wp = (uint8_t*)wbuf;
      uint8_t* rp = (uint8_t*)rbuf;
      while (len)
      {
        uint8_t data = xfer(wp ? *wp++ : 0xFF);
        if (rp)
          *rp++ = data;
      }
    }

    void read(void *buf, size_t len)
    {
      xfer(0, buf, len);
    }

    void write(const void *buf, size_t len)
    {
      xfer(buf, 0, len);
    }

  protected:

    static Spi* _instances[SPI_MAX_CH];

    SPI_t*     _spi;
    uint8_t    _ch;
};

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avr8_spi.h - SPI Driver for Microchip AVR8 Series

This program is free software: you can redistribute it and/or

modify it under the terms of the GNU General Public License as

published by the Free Software Foundation, either version 3 of

the License, or at your option) any later version.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program. If not, see <https://www.gnu.org/licenses/>.

#pragma once

#include "avr8_config.h"

#include "avr8_clock.h"

#if defined(SPI1)

#define SPI_MAX_CH 2

#elif defined(SPI0)

#define SPI_MAX_CH 1

#else

#define SPI_MAX_CH 0

#endif

class Spi

{

public:

/* SPI Mode select */

typedef enum

{

MODE_0 = SPI_MODE_0_gc, /* SPI Mode 0 */

MODE_1 = SPI_MODE_1_gc, /* SPI Mode 1 */

MODE_2 = SPI_MODE_2_gc, /* SPI Mode 2 */

MODE_3 = SPI_MODE_3_gc, /* SPI Mode 3 */

} MODE;

/* Prescaler select */

typedef enum

{

PRESC_DIV2 = SPI_PRESC_DIV4_gc | SPI_CLK2X_bm, /* System Clock / 2 */

PRESC_DIV4 = SPI_PRESC_DIV4_gc, /* System Clock / 4 */

PRESC_DIV8 = SPI_PRESC_DIV16_gc | SPI_CLK2X_bm, /* System Clock / 8 */

PRESC_DIV16 = SPI_PRESC_DIV16_gc, /* System Clock / 16 */

PRESC_DIV32 = SPI_PRESC_DIV64_gc | SPI_CLK2X_bm, /* System Clock / 32 */

PRESC_DIV64 = SPI_PRESC_DIV64_gc, /* System Clock / 64 */

PRESC_DIV128 = SPI_PRESC_DIV128_gc, /* System Clock / 128 */

} PRESC;

Spi(SPI_t& spi) : _spi(&spi), _ch((&spi - &SPI0) / sizeof(spi))

{

_instances[_ch] = this;

}

/* virtual */ ~Spi(void)

{

end();

_instances[_ch] = 0;

}

bool begin(uint32_t frq, MODE mode = MODE_3)

{

static const uint8_t CLKDIV[] = { 2, 4, 8, 16, 32, 64, 128 };

static const PRESC PRESCS[] = { PRESC_DIV2, PRESC_DIV4, PRESC_DIV8, PRESC_DIV16, PRESC_DIV32, PRESC_DIV64, PRESC_DIV128 };

uint32_t div = Clock::frequency() / (frq ? frq : 1);

for (uint8_t i = 0; i < sizeof(CLKDIV) / sizeof(CLKDIV[0]); ++i)

{

if (div <= CLKDIV[i])

{

begin(PRESCS[i], mode);

return true;

}

begin(PRESCS[sizeof(PRESCS) / sizeof(PRESCS[0]) - 1], mode);

return false;

}

void begin(PRESC presc, MODE mode)

{

end();

_spi->INTCTRL = 0;

_spi->CTRLB = SPI_SSD_bm | mode;

_spi->CTRLA = SPI_MASTER_bm | presc | SPI_ENABLE_bm;

}

void end(void)

{

_spi->CTRLA = 0;

}

void lsbfirst(bool enable = true)

{

_spi->CTRLA = (_spi->CTRLA & ~SPI_DORD_bm) | (enable ? SPI_DORD_bm : 0);

}

uint8_t xfer(uint8_t data)

{

_spi->DATA = data;

while ((_spi->INTFLAGS & SPI_IF_bm) == 0)

continue;

return _spi->DATA;

}

uint8_t read(void)

{

return xfer(0xFF);

}

void write(uint8_t data)

{

xfer(data);

}

void xfer(const void *wbuf, void *rbuf, size_t len)

{

const uint8_t* wp = (uint8_t*)wbuf;

uint8_t* rp = (uint8_t*)rbuf;

while (len)

{

uint8_t data = xfer(wp ? *wp++ : 0xFF);

if (rp)

*rp++ = data;

}

void read(void *buf, size_t len)

{

xfer(0, buf, len);

}

void write(const void *buf, size_t len)

{

xfer(buf, 0, len);

}

protected:

static Spi* _instances[SPI_MAX_CH];

SPI_t* _spi;

uint8_t _ch;

};

/*
  avr8_spi.cpp - SPI Driver for Microchip AVR8 Series
 
  Copyright (c) 2025 Sasapea's Lab. All right reserved.
 
  This program is free software: you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation, either version 3 of
  the License, or at your option) any later version.
 
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU General Public License for more details.
 
  You should have received a copy of the GNU General Public License
  along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "avr8_spi.h"

Spi* Spi::_instances[];

avr8_spi.cpp - SPI Driver for Microchip AVR8 Series

This program is free software: you can redistribute it and/or

modify it under the terms of the GNU General Public License as

published by the Free Software Foundation, either version 3 of

the License, or at your option) any later version.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program. If not, see <https://www.gnu.org/licenses/>.

#include "avr8_spi.h"

Spi* Spi::_instances[];

カテゴリー: avr8

Microchip AVR8 用のライブラリを自作する。(SPI)