STM32G031とWS2812B(3個)でランダムに光らせる。


x ws2812bがなぜ3個なのかと言うと2,3個で電流が超えるらしい

目的
GPIOのテスト

構成
windows 10 20H2
Arduino
1.8.13(Windows Store 1.8.42.0)
STM32duino 1.9.0

STM32G031J6M6

説明
WS2812Bの接続ピンは、PA8(5ピン)です。


![h_con92.jpg](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/840352/20527fea-4137-4342-67a2-49c32e4a2b3a.jpeg)



```c++


int l[90]; //max30 led

void bit_on1();
void bit_off1();

//             12345678   12345678   12345678   12345678
int b8[8] = {0b10000000,0b01000000,0b00100000,0b00010000,
             0b00001000,0b00000100,0b00000010,0b00000001, };

int ws_led(int num1)
{
  int on_off;

  for(int ii=0;ii<num1;ii++){

    //8ビット分送る
    for(int jj=0;jj<8;jj++){

      on_off = l[ii] & b8[jj];

      if( on_off == 0 ){
        bit_off1(); //ビットが0
      } else {
        bit_on1(); //ビットが1 
      }//endif

    }//for 8bit

  }//for max30byt

  return(0);
}//ws_led

void setup() {

  randomSeed( micros() ); //乱数の初期化

  pinMode(PA8, OUTPUT);  

  while(1){

    //l[3*0+0] = 31;
    //l[3*0+1] = 32;
    //l[3*0+2] = 33;
    //
    //l[3*1+0] = 30;
    //l[3*1+1] = 10;
    //l[3*1+2] = 32;
    //
    //l[3*2+0] = 10;
    //l[3*2+1] = 10;
    //l[3*2+2] = 32;

    for(int ii=0;ii<9;ii++){
      l[ii] = random(32);
    }//for

    //ws2812bへデータを送る
    ws_led(9);

    //0.1秒待つ
    delay(100);

  } //while

}//setup

void loop() {
}//loop
                  
                  //      5432109876543210
int on1  = GPIOA->ODR | 0b0000000100000000;
int off1 = GPIOA->ODR & 0b1111111011111111;

// 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 
void bit_off1(){
   //0.3us 800khz
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;


    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
}//0.3us


// 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
void bit_on1(){
   //1us 800khz
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;

    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;

    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;
    GPIOA->ODR = on1;

    GPIOA->ODR = on1;
    GPIOA->ODR = on1;

    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
    GPIOA->ODR = off1;
}//1us




```