LimCube

/*
 * PB0 - CLK
 * PB1 - RST
 *
 * USB programming:
 * https://medium.com/@paramaggarwal/programming-an-stm32f103-board-using-usb-port-blue-pill-953cec0dbc86
 * http://www.stm32duino.com/viewtopic.php?f=2&t=1920
 *
 * delay functions:
 * http://www.stm32duino.com/viewtopic.php?f=18&t=326
 * https://gist.github.com/RickKimball/8bc8228cfb6f73ccf2e9
 *
 * remapping:
 * http://www.stm32duino.com/viewtopic.php?t=2539
 * http://www.stm32duino.com/viewtopic.php?t=1224
 * http://www.stm32duino.com/viewtopic.php?t=1346
 * http://www.stm32duino.com/viewtopic.php?f=14&t=296
 *
 * without delay - clock @ ~3.6 MHz
 * delayMicroseconds(1) - FETs @ ~5.7 kHz, clock @ 400 kHz
 *
 *
 */
const uint8 first[] = {
  0b11111111, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b11111111,
  0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001,
  0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001,
  0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001,
  0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001,
  0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001,
  0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001,
  0b11111111, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b11111111
};

void setup() {
  // http://www.stm32duino.com/viewtopic.php?t=1130
  afio_cfg_debug_ports(AFIO_DEBUG_SW_ONLY); // release PB3 and PB5

  pinMode(PA0, OUTPUT);
  pinMode(PA1, OUTPUT);
  pinMode(PA2, OUTPUT);
  pinMode(PA3, OUTPUT);
  pinMode(PA4, OUTPUT);
  pinMode(PA5, OUTPUT);
  pinMode(PA6, OUTPUT);
  pinMode(PA7, OUTPUT);
  pinMode(PB0, OUTPUT);

  pinMode(PB0, OUTPUT);
  pinMode(PB1, OUTPUT);

  pinMode(PB3, OUTPUT);
  pinMode(PB4, OUTPUT);
  pinMode(PB5, OUTPUT);
  pinMode(PB6, OUTPUT);
  pinMode(PB7, OUTPUT);
  pinMode(PB8, OUTPUT);
  pinMode(PB9, OUTPUT);
  pinMode(PB10, OUTPUT);

}

void loop() {
  //GPIOB->regs->BSRR = 0xFFFF;
  for(uint8 layer = 0; layer < 8; layer++) {
    GPIOB->regs->BRR = 0xFF << 3; // reset MOSFETs

    GPIOB->regs->BSRR = 0b1000 << layer; // enable one FET
    //GPIOB->regs->BSRR = 1 << 5; // set MOSFETs
    //delay(100);
    for(uint8 p = 0; p < 8; p++) {
      GPIOB->regs->BRR = 1; // lower clock
      delayMicroseconds(1);
      GPIOA->regs->BRR = 0xFF; // reset shift register inputs
      GPIOA->regs->BSRR = first[layer * 8 + p]; // set shift register inputs

      GPIOB->regs->BSRR = 1; // raise clock
      delayMicroseconds(1);
    }
    delayMicroseconds(1);
    //delay(20);
  }
}