efm32 硬件SPI

只看该作者 · 2011-11-21 17:05

void SPI_setup(uint8_t spiNumber, uint8_t location, bool master)
{
  USART_TypeDef *spi;
  /* Determining USART */
  switch (spiNumber)
  {
  case 0:
spi = USART0;
break;
  case 1:
spi = USART1;
break;
  case 2:
// spi = USART2;
break;
  default:
return;
  }
//USART_Reset(spi);
  /* Setting baudrate */
  spi->CLKDIV = 128 * (SPI_PERCLK_FREQUENCY / SPI_BAUDRATE - 2);

  /* Configure SPI */
  /* Using synchronous (SPI) mode*/
  //spi->CTRL = USART_CTRL_SYNC;//|USART_CTRL_CLKPHA;
spi->CTRL = USART_CTRL_SYNC ;//|USART_CTRL_CLKPHA;//|USART_CTRL_CLKPOL ;
  //spi->FRAME|=USART_FRAME_DATABITS_EIGHT;
  /* Clearing old transfers/receptions, and disabling interrupts */
  spi->CMD = USART_CMD_CLEARRX | USART_CMD_CLEARTX;
  spi->IEN = 0;
  /* Enabling pins and setting location */
  spi->ROUTE = USART_ROUTE_TXPEN | USART_ROUTE_RXPEN | USART_ROUTE_CLKPEN | USART_ROUTE_CSPEN | (location << 8);

  /* Set GPIO config to slave */


  /* Set to master and to control the CS line */
  if (master)
  {
/* Enabling Master, TX and RX */
spi->CMD = USART_CMD_MASTEREN | USART_CMD_TXEN | USART_CMD_RXEN;
spi->CTRL |= USART_CTRL_AUTOCS;
   /* 数据传输高位在前 */
   spi->CTRL |=USART_CTRL_MSBF;

/* Set GPIO config to master */
gpioModeMosi = gpioModePushPull;
gpioModeMiso = gpioModePushPull;
gpioModeCs = gpioModePushPull;
gpioModeClk  = gpioModePushPull;
  }
  else
  {
/* Enabling TX and RX */
spi->CMD = USART_CMD_TXEN | USART_CMD_RXEN;
   /* Set GPIO config to slave */
gpioModeMosi = gpioModeInput;
gpioModeMiso = gpioModePushPull;
gpioModeCs = gpioModeInput;
gpioModeClk  = gpioModeInput;
  }
  /* Clear previous interrupts */
  spi->IFC = _USART_IFC_MASK;
  /* IO configuration */
  switch(spiNumber)
  {
case 0: switch(location)
         {
            case 0: /* IO configuration (USART 0, Location #0) */
                  GPIO_PinModeSet(gpioPortE, 10, gpioModeMosi, 0); /* MOSI */
                  GPIO_PinModeSet(gpioPortE, 11, gpioModeMiso, 0); /* MISO */
                  GPIO_PinModeSet(gpioPortE, 13, gpioModeCs, 0); /* CS */
                  GPIO_PinModeSet(gpioPortE, 12, gpioModeClk,  0); /* Clock */
                  break;
            case 1: /* IO configuration (USART 0, Location #1) */
                  GPIO_PinModeSet(gpioPortE, 7, gpioModeMosi, 0);  /* MOSI */
                  GPIO_PinModeSet(gpioPortE, 6, gpioModeMiso, 0);  /* MISO */
                  GPIO_PinModeSet(gpioPortE, 4, gpioModeCs, 0);  /* CS */
                  GPIO_PinModeSet(gpioPortE, 5, gpioModeClk,  0);  /* Clock */
                  break;
            case 2: /* IO configuration (USART 0, Location #2) */
                  GPIO_PinModeSet(gpioPortC, 11, gpioModeMosi, 0); /* MOSI */
                  GPIO_PinModeSet(gpioPortC, 10, gpioModeMiso, 0); /* MISO */
                  GPIO_PinModeSet(gpioPortC,  8, gpioModeCs, 0); /* CS */
                  GPIO_PinModeSet(gpioPortC,  9, gpioModeClk,  0); /* Clock */
                  break;
         default: break;
         }
         break;
case 1: switch(location)
         {
            case 0: /* IO configuration (USART 1, Location #0) */
                  GPIO_PinModeSet(gpioPortC, 0, gpioModeMosi, 0);  /* MOSI */
                  GPIO_PinModeSet(gpioPortC, 1, gpioModeMiso, 0);  /* MISO */
                  GPIO_PinModeSet(gpioPortB, 8, gpioModeCs, 0);  /* CS */
                  GPIO_PinModeSet(gpioPortB, 7, gpioModeClk,  0);  /* Clock */
                  break;
            case 1: /* IO configuration (USART 1, Location #1) */
                  GPIO_PinModeSet(gpioPortD, 0, gpioModeMosi, 0);  /* MOSI */
                  GPIO_PinModeSet(gpioPortD, 1, gpioModeMiso, 0);  /* MISO */
                  GPIO_PinModeSet(gpioPortD, 3, gpioModeCs, 0);  /* CS */
                  GPIO_PinModeSet(gpioPortD, 2, gpioModeClk,  0);  /* Clock */
                  break;
         default: break;
         }
         break;
case 2: switch(location)
         {
            case 0: /* IO configuration (USART 2, Location #0) */
                  GPIO_PinModeSet(gpioPortC, 2, gpioModeMosi, 0);  /* MOSI */
                  GPIO_PinModeSet(gpioPortC, 3, gpioModeMiso, 0);  /* MISO */
                  GPIO_PinModeSet(gpioPortC, 5, gpioModeCs, 0);  /* CS */
                  GPIO_PinModeSet(gpioPortC, 4, gpioModeClk,  0);  /* Clock */
                  break;
            case 1: /* IO configuration (USART 2, Location #1) */
                  GPIO_PinModeSet(gpioPortB, 3, gpioModeMosi, 0);  /* MOSI */
                  GPIO_PinModeSet(gpioPortB, 4, gpioModeMiso, 0);  /* MISO */
                  GPIO_PinModeSet(gpioPortB, 6, gpioModeCs, 0);  /* CS */
                  GPIO_PinModeSet(gpioPortB, 5, gpioModeClk,  0);  /* Clock */
                  break;
         default: break;
         }
         break;
default: break;
  }
}
我这里对其初始化，可是在示波器看到cs输出波形不对，请大家帮忙解决一下