/home/daqweb/fgddaq/c8051/Protocols/LPB_SPI_handler.c File Reference

#include "../mscbemb.h"
#include "LPB_SPI_handler.h"

Functions
void	LPBSPI_Init (void)
void	LPBSPI_ClockOnce (void)
void	LPBSPI_WriteByte (unsigned char dataToSend)
unsigned char	LPBSPI_ReadByteRising (void)
Variables
sbit	LPBSPI_SCK = LPB_SPI_SCK
sbit	LPBSPI_MISO = LPB_SPI_MISO
sbit	LPBSPI_MOSI = LPB_SPI_MOSI

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Function Documentation

void LPBSPI_ClockOnce

(

void

)

Generating the SPI communication clock."SFRPAGE = SPI0_PAGE" makes sure that we are in the right page to properly communicate with the SPI protocol.

Attention:

The SPI clock is currently running at 50us.

{
  delay_us(LPBSPI_DELAY);
  LPBSPI_SCK = 1;
  delay_us(LPBSPI_DELAY);
  LPBSPI_SCK = 0;
}

void LPBSPI_Init

(

void

)

Initializing the SPI communication by pulling the SPI Master Output Slave Input (MOSI) pin to 1.

{
  SFRPAGE  = SPI0_PAGE ;
//  LPBSPI_MOSI = 1;          //pull the MOSI line high
}

unsigned char LPBSPI_ReadByteRising

(

void

)

{
  signed char i = 0;
  unsigned char din = 0;
  unsigned char dataReceived = 0;

  for(i = 7; i >= 0; i--)
  {
          delay_us(LPBSPI_DELAY);
    din = LPBSPI_MISO;
    dataReceived |= (din << i);
        LPBSPI_SCK = 1;
        delay_us(LPBSPI_DELAY);
        LPBSPI_SCK = 0;
 
  }
  return dataReceived;
}

void LPBSPI_WriteByte

(

unsigned char

dataToSend

)

Performing SPI write operation.One byte of data transmits in a bit wise fashion

Parameters:

dataToSend

One byte of information which has to be sent via SPI protocol.

Returns:

The function does not return any value.

{
  signed char i;

  for(i = 7; i >= 0; i--) {
     LPBSPI_MOSI = (dataToSend >> i) & 0x01;
     LPBSPI_ClockOnce();
  }
  LPBSPI_MOSI = 0;
}

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Variable Documentation

sbit LPBSPI_MISO = LPB_SPI_MISO

sbit LPBSPI_MOSI = LPB_SPI_MOSI

sbit LPBSPI_SCK = LPB_SPI_SCK

Setting the related pins of SPI protocol

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