LPC17XX SSP KEIL

自己写的SSP0/1驱动，SSP0测试通过

 

#include "lpc17xx.h"    /* LPC17xx Peripheral Registers */
#include "type.h"
#include "nvic.h"
#include "ssp.h"

/*****************************************************************************
** Function name:  SSP0Init
** Descriptions:  SSP0 initialization  mark: operate SEL outside
** parameters:   none
** Returned value:  true or false
*****************************************************************************/
DWORD SSP0Init( void )
{
  /* set p1.24 as MOSI0, p1.23 as MISO0, p1.20 as SCK0, P1.21 as GPIO */
  PINSEL3 |= 0x0003C300;
  /* set p1.21 output */
  FIO1DIR |= 0x00200000;
  FIO1SET |= 0x00200000;
  /* set ssp0 clock */
  SSP0CPSR = 0x04;  
  /* SSP0 Control Register 0 */
  SSP0CR0 = (0x00 << 8) |              // SCR  SSP0CLK =Fpclk/(CSPDVR*(SCR+1)) = 50000000/2 =25000000
            (0x00 << 7) |              // CPHA=0     
            (0x00 << 6) |              // CPOL=0    
            (0x00 << 4) |              // FRF  Frame Format 00=SPI, 01=SSI, 10=Microwire, 11=reserve    
            (0x07 << 0);               // DSS  Data Size,0000-0010=reserve, 0011=4-bit, 0111=8-bit, 1111=16-bit 
  /* disable all interrupts */
  SSP0IMSC = 0x00;
  /* SSP0 Control Register 1 */
  SSP0CR1 = (0x00 << 3) |              // SOD  Slave Output Disable, 1=disable, 0=enable, only in Slave Mode    
            (0x00 << 2) |              // MS   Master or Slave, 0 = Master, 1 = Slave    
            (0x01 << 1) |              // SSE  SSP Enable, 1=enable, 0=disable    
            (0x00 << 0);               // LBM  Loop Back Mode, 0=normal operation 
  /* SSP0 Interrupt Mask Set/Clear Register */
  SSP0ICR = 0x00;

  return( TRUE );
}
 
/*****************************************************************************
** Function name:  SSP0Send
** Descriptions:  SSP0 transmit data  mark: operate SEL outside
** parameters:   buf
** Returned value:  none
*****************************************************************************/
void SSP0Send( BYTE buf )
{
  BYTE Dummy;
  /* Wait for Transmit FIFO is not full and SSP controller is not busy */
  //while((SSP0SR & BSY != 0 );
  /* Send data */
  SSP0DR = buf;
  /* Wait for SSP controller is not busy and Receive FIFO not empty */
  while((SSP0SR & (BSY|RNE)) != RNE );
  /* Flush the RxFIFO */
  Dummy = SSP0DR; 
  /* To aviod errors in complier */
  Dummy = Dummy;
 
  return; 
}

/*****************************************************************************
** Function name:  SSP0ReceiveByte
** Descriptions:  SSP0 Receive data  mark: operate SEL outside
** parameters:   none
** Returned value:  data
*****************************************************************************/
BYTE SSP0ReceiveByte( void )
{
  BYTE data;
  /* Wait for Transmit FIFO is not full and SSP0 controller is not busy */
  //while((SSP0SR & BSY != 0 );
  /* wrtie dummy byte out to generate clock, then read data from MISO */
  SSP0DR = 0xFF;
  /* Wait for SSP0 controller is not busy and Receive FIFO not empty */
  while((SSP0SR & (BSY|RNE)) != RNE );
  /* Read the data */
  data = SSP0DR;
  return ( data ); 
}

/*****************************************************************************
** Function name:  SSP1Init
** Descriptions:  SSP1 initialization  mark: operate SEL outside
** parameters:   none
** Returned value:  true or false
*****************************************************************************/
DWORD SSP1Init( void )
{
  /* set p0.9 as MOSI1, p0.8 as MISO1, p0.7 as SCK1, P0.6 as GPIO */
  PINSEL0 |= 0x000A8000; 
  /* set p1.21 output */
  FIO1DIR |= 0x00000040;
  FIO1SET |= 0x00000040;
  /* set ssp1 clock */
  SSP1CPSR = 0x02;  
  /* SSP1 Control Register 0 */
  SSP1CR0 = (0x00 << 8) |              // SCR  SSP1CLK =Fpclk/(CSPDVR*(SCR+1)) = 50000000/2 =25000000
            (0x00 << 7) |              // CPHA=0     
            (0x00 << 6) |              // CPOL=0    
            (0x00 << 4) |              // FRF  Frame Format 00=SPI, 01=SSI, 10=Microwire, 11=reserve    
            (0x07 << 0);               // DSS  Data Size,0000-0010=reserve, 0011=4-bit, 0111=8-bit, 1111=16-bit 
  /* disable all interrupts */
  SSP1IMSC = 0x00;
  /* SSP1 Control Register 1 */
  SSP1CR1 = (0x00 << 3) |              // SOD  Slave Output Disable, 1=disable, 0=enable, only in Slave Mode    
            (0x00 << 2) |              // MS   Master or Slave, 0 = Master, 1 = Slave    
            (0x01 << 1) |              // SSE  SSP Enable, 1=enable, 0=disable    
            (0x00 << 0);               // LBM  Loop Back Mode, 0=normal operation 
  /* SSP1 Interrupt Mask Set/Clear Register */
  SSP1ICR = 0x00;

  return( TRUE );
}
 
/*****************************************************************************
** Function name:  SSP1Send
** Descriptions:  SSP1 transmit data  mark: operate SEL outside
** parameters:   buf
** Returned value:  none
*****************************************************************************/
void SSP1Send( BYTE buf )
{
  BYTE Dummy;
  /* Wait for Transmit FIFO is not full and SSP controller is not busy */
  //while((SSP1SR & BSY != 0 );
  /* Send data */
  SSP1DR = buf;
  /* Wait for SSP controller is not busy and Receive FIFO not empty */
  while((SSP1SR & (BSY|RNE)) != RNE );
  /* Flush the RxFIFO */
  Dummy = SSP1DR; 
  /* To aviod errors in complier */
  Dummy = Dummy;
 
  return; 
}
 
/*****************************************************************************
** Function name:  SSP1ReceiveByte
** Descriptions:  SSP1 Receive data  mark: operate SEL outside
** parameters:   none
** Returned value:  data
*****************************************************************************/
BYTE SSP1ReceiveByte( void )
{
  BYTE data;
  /* Wait for Transmit FIFO is not full and SSP controller is not busy */
  //while((SSP1SR & BSY != 0 );
  /* wrtie dummy byte out to generate clock, then read data from MISO */
  SSP1DR = 0xFF;
  /* Wait for SSP controller is not busy and Receive FIFO not empty */
  while((SSP1SR & (BSY|RNE)) != RNE );
  /* Read the data */
  data = SSP1DR;
  return ( data ); 
}