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)】
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#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】
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/* 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) { if (frq) { 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; for (uint8_t i = 0; i < sizeof(CLKDIV) / sizeof(CLKDIV[0]); ++i) { if (div <= CLKDIV[i]) { begin(PRESCS[i], mode); return true; } } } 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.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[]; |