El código generado de ejemplo sigue, como lo solicitó, para MSSP1, modo maestro 0,0, SMPMID, 1MHz (a un FOsc de 64MHz). Primero para el archivo "spi1.h":
/**
MSSP1 Generated Driver API Header File
@Company
Microchip Technology Inc.
@File Name
mssp1.h
@Summary
This is the generated header file for the MSSP1 driver using MPLAB(c) Code Configurator
@Description
This header file provides APIs for MSSP1.
Generation Information :
Product Revision : MPLAB(c) Code Configurator - 4.15
Device : PIC18F27K40
Driver Version : 2.00
The generated drivers are tested against the following:
Compiler : XC8 1.35
MPLAB : MPLAB X 3.40
*******************************************************************************/
/*
(c) 2016 Microchip Technology Inc. and its subsidiaries. You may use this
software and any derivatives exclusively with Microchip products.
THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES, WHETHER
EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE, INCLUDING ANY IMPLIED
WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY, AND FITNESS FOR A
PARTICULAR PURPOSE, OR ITS INTERACTION WITH MICROCHIP PRODUCTS, COMBINATION
WITH ANY OTHER PRODUCTS, OR USE IN ANY APPLICATION.
IN NO EVENT WILL MICROCHIP BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE,
INCIDENTAL OR CONSEQUENTIAL LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND
WHATSOEVER RELATED TO THE SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS
BEEN ADVISED OF THE POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO THE
FULLEST EXTENT ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN
ANY WAY RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
MICROCHIP PROVIDES THIS SOFTWARE CONDITIONALLY UPON YOUR ACCEPTANCE OF THESE
TERMS.
*/
#ifndef _SPI1_H
#define _SPI1_H
/**
Section: Included Files
*/
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#ifdef __cplusplus // Provide C++ Compatibility
extern "C" {
#endif
/**
Section: Macro Declarations
*/
#define DUMMY_DATA 0x0
/**
Section: SPI1 Module APIs
*/
/**
@Summary
Initializes the SPI1
@Description
This routine initializes the SPI1.
This routine must be called before any other MSSP1 routine is called.
This routine should only be called once during system initialization.
@Preconditions
None
@Param
None
@Returns
None
@Comment
@Example
<code>
uint8_t myWriteBuffer[MY_BUFFER_SIZE];
uint8_t myReadBuffer[MY_BUFFER_SIZE];
uint8_t writeData;
uint8_t readData;
uint8_t total;
SPI1_Initialize();
total = 0;
do
{
total = SPI1_Exchange8bitBuffer(&myWriteBuffer[total], MY_BUFFER_SIZE - total, &myWriteBuffer[total]);
// Do something else...
} while(total < MY_BUFFER_SIZE);
readData = SPI1_Exchange8bit(writeData);
</code>
*/
void SPI1_Initialize(void);
/**
@Summary
Exchanges a data byte over SPI1
@Description
This routine exchanges a data byte over SPI1 bus.
This is a blocking routine.
@Preconditions
The SPI1_Initialize() routine should be called
prior to use this routine.
@Param
data - data byte to be transmitted over SPI1 bus
@Returns
The received byte over SPI1 bus
@Example
<code>
uint8_t writeData;
uint8_t readData;
uint8_t readDummy;
SPI1_Initialize();
// for transmission over SPI bus
readDummy = SPI1_Exchange8bit(writeData);
// for reception over SPI bus
readData = SPI1_Exchange8bit(DUMMY_DATA);
</code>
*/
uint8_t SPI1_Exchange8bit(uint8_t data);
/**
@Summary
Exchanges buffer of data over SPI1
@Description
This routine exchanges buffer of data (of size one byte) over SPI1 bus.
This is a blocking routine.
@Preconditions
The SPI1_Initialize() routine should be called
prior to use this routine.
@Param
dataIn - Buffer of data to be transmitted over SPI1.
bufLen - Number of bytes to be exchanged.
dataOut - Buffer of data to be received over SPI1.
@Returns
Number of bytes exchanged over SPI1.
@Example
<code>
uint8_t myWriteBuffer[MY_BUFFER_SIZE];
uint8_t myReadBuffer[MY_BUFFER_SIZE];
uint8_t total;
SPI1_Initialize();
total = 0;
do
{
total = SPI1_Exchange8bitBuffer(&myWriteBuffer[total], MY_BUFFER_SIZE - total, &myWriteBuffer[total]);
// Do something else...
} while(total < MY_BUFFER_SIZE);
</code>
*/
uint8_t SPI1_Exchange8bitBuffer(uint8_t *dataIn, uint8_t bufLen, uint8_t *dataOut);
/**
@Summary
Gets the SPI1 buffer full status
@Description
This routine gets the SPI1 buffer full status
@Preconditions
The SPI1_Initialize() routine should be called
prior to use this routine.
@Param
None
@Returns
true - if the buffer is full
false - if the buffer is not full.
@Example
Refer to SPI1_Initialize() for an example
*/
bool SPI1_IsBufferFull(void);
/**
@Summary
Gets the status of write collision.
@Description
This routine gets the status of write collision.
@Preconditions
The SPI1_Initialize() routine must have been called prior to use this routine.
@Param
None
@Returns
true - if the write collision has occurred.
false - if the write collision has not occurred.
@Example
if(SPI1_HasWriteCollisionOccured())
{
SPI1_ClearWriteCollisionStatus();
}
*/
bool SPI1_HasWriteCollisionOccured(void);
/**
@Summary
Clears the status of write collision.
@Description
This routine clears the status of write collision.
@Preconditions
The SPI1_Initialize() routine must have been called prior to use this routine.
@Param
None
@Returns
None
@Example
if(SPI1_HasWriteCollisionOccured())
{
SPI1_ClearWriteCollisionStatus();
}
*/
void SPI1_ClearWriteCollisionStatus(void);
#ifdef __cplusplus // Provide C++ Compatibility
}
#endif
#endif // _SPI1_H
Ahora, para el archivo "spi1.c":
/**
MSSP1 Generated Driver File
@Company
Microchip Technology Inc.
@File Name
spi1.c
@Summary
This is the generated driver implementation file for the MSSP1 driver using MPLAB(c) Code Configurator
@Description
This source file provides APIs for MSSP1.
Generation Information :
Product Revision : MPLAB(c) Code Configurator - 4.15
Device : PIC18F27K40
Driver Version : 2.00
The generated drivers are tested against the following:
Compiler : XC8 1.35
MPLAB : MPLAB X 3.40
*/
/*
(c) 2016 Microchip Technology Inc. and its subsidiaries. You may use this
software and any derivatives exclusively with Microchip products.
THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES, WHETHER
EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE, INCLUDING ANY IMPLIED
WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY, AND FITNESS FOR A
PARTICULAR PURPOSE, OR ITS INTERACTION WITH MICROCHIP PRODUCTS, COMBINATION
WITH ANY OTHER PRODUCTS, OR USE IN ANY APPLICATION.
IN NO EVENT WILL MICROCHIP BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE,
INCIDENTAL OR CONSEQUENTIAL LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND
WHATSOEVER RELATED TO THE SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS
BEEN ADVISED OF THE POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO THE
FULLEST EXTENT ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN
ANY WAY RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
MICROCHIP PROVIDES THIS SOFTWARE CONDITIONALLY UPON YOUR ACCEPTANCE OF THESE
TERMS.
*/
/**
Section: Included Files
*/
#include <xc.h>
#include "spi1.h"
/**
Section: Macro Declarations
*/
#define SPI_RX_IN_PROGRESS 0x0
/**
Section: Module APIs
*/
void SPI1_Initialize(void)
{
// Set the SPI1 module to the options selected in the User Interface
// SMP Middle; CKE Active to Idle;
SSP1STAT = 0x40;
// SSPEN enabled; CKP Idle:Low, Active:High; SSPM FOSC/64;
SSP1CON1 = 0x22;
// SSPADD 0;
SSP1ADD = 0x00;
}
uint8_t SPI1_Exchange8bit(uint8_t data)
{
// Clear the Write Collision flag, to allow writing
SSP1CON1bits.WCOL = 0;
SSP1BUF = data;
while(SSP1STATbits.BF == SPI_RX_IN_PROGRESS)
{
}
return (SSP1BUF);
}
uint8_t SPI1_Exchange8bitBuffer(uint8_t *dataIn, uint8_t bufLen, uint8_t *dataOut)
{
uint8_t bytesWritten = 0;
if(bufLen != 0)
{
if(dataIn != NULL)
{
while(bytesWritten < bufLen)
{
if(dataOut == NULL)
{
SPI1_Exchange8bit(dataIn[bytesWritten]);
}
else
{
dataOut[bytesWritten] = SPI1_Exchange8bit(dataIn[bytesWritten]);
}
bytesWritten++;
}
}
else
{
if(dataOut != NULL)
{
while(bytesWritten < bufLen )
{
dataOut[bytesWritten] = SPI1_Exchange8bit(DUMMY_DATA);
bytesWritten++;
}
}
}
}
return bytesWritten;
}
bool SPI1_IsBufferFull(void)
{
return (SSP1STATbits.BF);
}
bool SPI1_HasWriteCollisionOccured(void)
{
return (SSP1CON1bits.WCOL);
}
void SPI1_ClearWriteCollisionStatus(void)
{
SSP1CON1bits.WCOL = 0;
}