STM32G031でソフトウェアSPIの速度を測って遊ぶ2
やく1.5Mバイト秒(まちがっているかも



//Soft_SPI_test3_031

#define DW    digitalWrite

#define TFT_MOSI PA12
#define TFT_SCK  PA1

//                                            m          C
//                                         5432109876543210
#define REG_MOSI_ON           GPIOA->ODR=0b0001000000000000;
//                                             m         C
//                                         5432109876543210
#define REG_CLK_ON__MOSI_1    GPIOA->ODR=0b0001000000000010;
//                                            m          C
//                                         5432109876543210
#define REG_MOSI_OFF          GPIOA->ODR=0b0000000000000000;
//                                            m          C
//                                         5432109876543210
#define REG_CLK_ON__MOSI_0    GPIOA->ODR=0b0000000000000010;
//                                            m          C
//                                         5432109876543210
#define REG_CLK_OFF           GPIOA->ODR=0b0000000000000000;


void SPI_WRITE8(int s)
{
  //1
  if (s & 0x80) {
    REG_MOSI_ON;
    REG_CLK_ON__MOSI_1;
    REG_CLK_OFF;
  } else {
    REG_MOSI_OFF;
    REG_CLK_ON__MOSI_0;
    REG_CLK_OFF;
  }//end if
  //2
  if (s & 0x40) {
    REG_MOSI_ON;
    REG_CLK_ON__MOSI_1;
    REG_CLK_OFF;
  } else {
    REG_MOSI_OFF;
    REG_CLK_ON__MOSI_0;
    REG_CLK_OFF;
  }//end if
  //3
  if (s & 0x20) {
    REG_MOSI_ON;
    REG_CLK_ON__MOSI_1;
    REG_CLK_OFF;
  } else {
    REG_MOSI_OFF;
    REG_CLK_ON__MOSI_0;
    REG_CLK_OFF;
  }//end if
  //4
  if (s & 0x10) {
    REG_MOSI_ON;
    REG_CLK_ON__MOSI_1;
    REG_CLK_OFF;
  } else {
    REG_MOSI_OFF;
    REG_CLK_ON__MOSI_0;
    REG_CLK_OFF;
  }//end if
  //5
  if (s & 0x08) {
    REG_MOSI_ON;
    REG_CLK_ON__MOSI_1;
    REG_CLK_OFF;
  } else {
    REG_MOSI_OFF;
    REG_CLK_ON__MOSI_0;
    REG_CLK_OFF;
  }//end if
  //6
  if (s & 0x04) {
    REG_MOSI_ON;
    REG_CLK_ON__MOSI_1;
    REG_CLK_OFF;
  } else {
    REG_MOSI_OFF;
    REG_CLK_ON__MOSI_0;
    REG_CLK_OFF;
  }//end if
  //7
  if (s & 0x02) {
    REG_MOSI_ON;
    REG_CLK_ON__MOSI_1;
    REG_CLK_OFF;
  } else {
    REG_MOSI_OFF;
    REG_CLK_ON__MOSI_0;
    REG_CLK_OFF;
  }//end if
  //8
  if (s & 0x01) {
    REG_MOSI_ON;
    REG_CLK_ON__MOSI_1;
    REG_CLK_OFF;
  } else {
    REG_MOSI_OFF;
    REG_CLK_ON__MOSI_0;
    REG_CLK_OFF;
  }//end if

}//SPI_WRITE8


void setup() {

  pinMode(TFT_MOSI, OUTPUT);
  pinMode(TFT_SCK , OUTPUT);

loop1:

  SPI_WRITE8(0xF0);
  SPI_WRITE8(0xF0);
  SPI_WRITE8(0xF0);
  SPI_WRITE8(0xF0);
  SPI_WRITE8(0xF0);

  SPI_WRITE8(0xF0);
  SPI_WRITE8(0xF0);
  SPI_WRITE8(0xF0);
  SPI_WRITE8(0xF0);
  SPI_WRITE8(0xF0);

  goto loop1;

}

void loop() {

  SPI_WRITE8(0x00);
  SPI_WRITE8(0x00);
  delay(2000);
  SPI_WRITE8(0x00);
  SPI_WRITE8(0x55);
  delay(2000);
  SPI_WRITE8(0x00);
  SPI_WRITE8(0xaa);
  delay(2000);
  SPI_WRITE8(0x00);
  SPI_WRITE8(0xff);
  delay(2000);

}