[参考译文] TM4C123GH6PM：使用 TM4C123GH6PM 仿真 PS/2键盘发送数据

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1057335/tm4c123gh6pm-emulating-ps-2-keyboard-send-data-with-tm4c123gh6pm

您好！

我想使用 tm4c123gh下午6发送 ps/2键盘命令。 ps2dev 库通过以下方式完成 PS2写入：

int PS2dev::write(unsigned char data) {
  
  delayMicroseconds(BYTEWAIT);

  unsigned char i;
  unsigned char parity = 1;

  if(digitalRead(_ps2clk) == LOW) {
    return -1;
  }

  if(digitalRead(_ps2data) == LOW) {
    return -2;
  }

  golo(_ps2data);
  delayMicroseconds(CLKHALF);
  
  // device sends on falling clock
  golo(_ps2clk);	// start bit
  delayMicroseconds(CLKFULL);
  
  gohi(_ps2clk);
  delayMicroseconds(CLKHALF);

  for(i=0; i<8; i++) {
    
      if(data & 0x01) {
        gohi(_ps2data);
      } else {
        golo(_ps2data);
      }
      
      delayMicroseconds(CLKHALF);
      golo(_ps2clk);
      
      delayMicroseconds(CLKFULL);
      gohi(_ps2clk);
      
      delayMicroseconds(CLKHALF);
      parity = parity ^ (data & 0x01);
      data = data >> 1;
  }
  
  // parity bit
  if(parity) {
    gohi(_ps2data);
  } else {
    golo(_ps2data);
  }
  delayMicroseconds(CLKHALF);
  golo(_ps2clk);
  delayMicroseconds(CLKFULL);
  gohi(_ps2clk);
  delayMicroseconds(CLKHALF);

  // stop bit
  gohi(_ps2data);
  delayMicroseconds(CLKHALF);
  golo(_ps2clk);
  delayMicroseconds(CLKFULL);
  gohi(_ps2clk);
  delayMicroseconds(CLKHALF);

  delayMicroseconds(BYTEWAIT);

  return 0;
}

但是、这是一种阻塞方法。 我是否可以通过任何方法来实现这一目标？ 我可以将 SPI 的时钟速度有多慢？ 基本上、我需要使用时钟生成串行数据、我是否可以将 SSI 外设的时钟频率设置为低至10-16.7kHz？