#include <m8c.h> // part specific constants and macros
#include "PSoCAPI.h" // PSoC API definitions for all User Modules
#include "mcp2515.h"
extern unsigned char SPITxBuff[8];
extern unsigned char SPIRxBuff[8];
void Dly(unsigned int di)
{
unsigned int di1;
for(di1=0;di1<di;di1++);
}
void Mcp2515Reset(void) //MCP2515复位
{
PRT1DR&=~0x20; //rest
Dly(1000);
PRT1DR|=0x20;
SPIM_Start(SPIM_SPIM_MODE_0|SPIM_SPIM_MSB_FIRST);
PRT1DR&=~0x80; //cs=0
while( ! (SPIM_bReadStatus() & SPIM_SPIM_TX_BUFFER_EMPTY ) );
SPIM_SendTxData(MCP2515_RESET); //RESET
PRT1DR|=0x80; //cs=1
}
void Mcp2515Write(unsigned char iAddress,unsigned char *iTxbuff,unsigned char iLen)//将iTxbuff数据写入iAddress地址开始iLen字节
{
unsigned char i;
SPIM_Start(SPIM_SPIM_MODE_0|SPIM_SPIM_MSB_FIRST);
PRT1DR&=~0x80; //cs=0
while( ! (SPIM_bReadStatus() & SPIM_SPIM_TX_BUFFER_EMPTY ) );
SPIM_SendTxData(MCP2515_WRITE);
while( ! (SPIM_bReadStatus() & SPIM_SPIM_TX_BUFFER_EMPTY ) );
SPIM_SendTxData(iAddress);
for(i=0;i<iLen;i++)
{
while( ! (SPIM_bReadStatus() & SPIM_SPIM_TX_BUFFER_EMPTY ) );
SPIM_SendTxData(iTxbuff);
}
PRT1DR|=0x80; //cs=1
}
unsigned char Mcp2515ReadSta(unsigned char iStatus) //读取两种状态寄存器用
{
unsigned char i;
SPIM_Start(SPIM_SPIM_MODE_0|SPIM_SPIM_MSB_FIRST);
PRT1DR&=~0x80; //cs=0
while( ! (SPIM_bReadStatus() & SPIM_SPIM_TX_BUFFER_EMPTY ) );
SPIM_SendTxData(iStatus);
SPIM_Start(SPIM_SPIM_MODE_3|SPIM_SPIM_MSB_FIRST);
while( ! (SPIM_bReadStatus() & SPIM_SPIM_TX_BUFFER_EMPTY ) );
SPIM_SendTxData(0);
while( ! (SPIM_bReadStatus() & SPIM_SPIM_RX_BUFFER_FULL ) );
i=SPIM_bReadRxData();
return i;
}
void Mcp2515Rts(unsigned char tbx ) //请求发送缓冲? ,bit0 缓冲0 ，bit1 缓冲1 bit2缓冲2
{
unsigned char i;
i=tbx|0x80;
SPIM_Start(SPIM_SPIM_MODE_0|SPIM_SPIM_MSB_FIRST);
PRT1DR&=~0x80; //cs=0
while( ! (SPIM_bReadStatus() & SPIM_SPIM_TX_BUFFER_EMPTY ) );
SPIM_SendTxData(i); //RESET
PRT1DR|=0x80; //cs=1
}
void Mcp2515Bitmod(unsigned char iAddressm,unsigned char iMSIDH,unsigned char iDatam) //位修改模式，参数地址，屏蔽位，数据
{
unsigned char ibu[4];
unsigned char i;
SPIM_Start(SPIM_SPIM_MODE_0|SPIM_SPIM_MSB_FIRST);
ibu[0]=MCP2515_BITMOD;
ibu[1]=iAddressm;
ibu[2]=iMSIDH;
ibu[3]=iDatam;
PRT1DR&=~0x80; //cs=0
for(i=0;i<4;i++)
{
while( ! (SPIM_bReadStatus() & SPIM_SPIM_TX_BUFFER_EMPTY ) );
SPIM_SendTxData(ibu);
}
PRT1DR|=0x80; //cs=1
}
void Mcp2515Read(unsigned char iAddress1,unsigned char *iRxbuff,unsigned char iLen1)
{
unsigned char i;
SPIM_Start(SPIM_SPIM_MODE_0|SPIM_SPIM_MSB_FIRST);
PRT1DR&=~0x80; //cs=0
while( ! (SPIM_bReadStatus() & SPIM_SPIM_TX_BUFFER_EMPTY ) );
SPIM_SendTxData(MCP2515_READ);
while( ! (SPIM_bReadStatus() & SPIM_SPIM_TX_BUFFER_EMPTY ) );
SPIM_SendTxData(iAddress1);
SPIM_Start(SPIM_SPIM_MODE_3 | SPIM_SPIM_MSB_FIRST);
for(i=0;i<iLen1;i++)
{
while( ! (SPIM_bReadStatus() & SPIM_SPIM_TX_BUFFER_EMPTY ) );
SPIM_SendTxData(0);
while( ! (SPIM_bReadStatus() & SPIM_SPIM_RX_BUFFER_FULL ) );
iRxbuff=SPIM_bReadRxData();
}
PRT1DR|=0x80; //cs=1
}
void Mcp2515WriteSigleReg(unsigned char regname,unsigned char regdata)
{
unsigned char i;
unsigned char ibuf[3];
SPIM_Start(SPIM_SPIM_MODE_0|SPIM_SPIM_MSB_FIRST);
ibuf[0]=MCP2515_WRITE;
ibuf[1]=regname;
ibuf[2]=regdata;
PRT1DR&=~0x80; //cs=0
for(i=0;i<3;i++)
{
while( ! (SPIM_bReadStatus() & SPIM_SPIM_TX_BUFFER_EMPTY ) );
SPIM_SendTxData(ibuf);
}
PRT1DR|=0x80; //cs=1
}
void InisMcp2515(void)
{
Mcp2515Reset(); //复位
Mcp2515WriteSigleReg(MCP2515_CANCTRL,MODE_CONFIG); //配置模式
Mcp2515WriteSigleReg(MCP2515_CNF1,SJW1+5); //设置CNF1
Mcp2515WriteSigleReg(MCP2515_CNF2,0XD9); //设置CNF2
Mcp2515WriteSigleReg(MCP2515_CNF3,0X02); //设置CNF3
Mcp2515WriteSigleReg(MCP2515_CANINTE,MCP2515_RX_INT); //设置中断类型
}
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