C++ (Cpp) spi_set_cs示例

示例#1

文件： hw-spi.c 项目： w5292c/mcode

void spi_init(void)
{
  /* First, configure CS as output */
  /* This MUST be done BEFORE configuring SPI as a master */
  DDRB |= (1U<<DDB4);
  spi_set_cs(false);
  /* Enable SPI, Master, set clock rate fck/2 */
  SPCR = (1U<<SPE) | (1U<<MSTR);
  /* Reset SPI2X flag */
  SPSR |= (1U<<SPI2X);
  /* Set SS, MOSI and SCK output */
  DDRB |= (1U<<DDB4) | (1U<<DDB5) | (1U<<DDB7);
  /* Set MISO input */
  DDRB &= ~(1U<<DDB6);
}

示例#2

文件： spi_adc_test.c 项目： cdkersey/busyboard

int spi_adc_read(struct busyboard *bb) {
  int i, val;
  spi_set_cs(bb, 0);

  for (i = 0; i < 3; ++i) {
    do_delay();
    spi_set_clk(bb);
    do_delay();
    spi_clear_clk(bb);
  }

  for (i = val = 0; i < 10; ++i) {
    do_delay();
    spi_set_clk(bb);
    do_delay();
    busyboard_in(bb);
    val = (val << 1) | (bb->in_state[1] & 1);
    spi_clear_clk(bb);
  }

  spi_clear_cs(bb);

  return val;
}