【EFM8 Universal Bee试用体验】通过SPI0+W5500以太网1--ping通

ti

`EFM8通过EXP PORT可以引出SPI接口,并且支持SPI master模式.
一、硬件端口选择
如图所示

可见，SPI所需的4个引脚都已经引出，分别为4-P1.0 SPI0-MOSI/6-P0.7 SPI0-MISO/8-P0.6 SPIO-SCK/10-P1.1 SPI0-SN
二、初始化SPI接口
1、打开efm8的外设

如图所示，勾选SPI0外设，使能SPI设备。
2、SPI参数配置

按照上图所示配置SPI0参数，需要特别注意，这里我选择了Master 3-wire mode，也就是cs引脚需要通过外部gpio的方式控制。
另一个就是SPI Clock Frequency的选择，我这里选为12.25MHz，这么选的目的是因为希望尽量快的操作W5500，Ｗ５５００允许８０ＭＨｚ最大的ＳＰＩ时钟。
３、外设引脚选择

当SPI外设参数配置完成后，我们需要选择ＳＰＩ的引脚，默认情况下ｍｏｓｉ，ｍｉｓｏ和ｓｃｋ会自动选定，由于前面ｃｓ引脚选定为Ｐ１．１，所以我们用ｇｐｉｏ的方式操作Ｐ１．１，我们修改Ｐ１．１的名字为ＳＰＩ＿ＣＳ。
二、Ｗ５５００基础操作函数的移植
１、ｓｐｉ写１字节

void spi_writechar(unsigned char d)
{
unsigned char i;
SPI0CN0_SPIF=0;
SPI0DAT=d; /* Send Register Address */
while(SPI0CN0_SPIF==0);
i=SPI0DAT;
}

复制代码

２、ｓｐｉ写２字节

void spi_writeint(unsigned int d)
{
unsigned char i;
SPI0CN0_SPIF=0;
SPI0DAT=d/256; /* Send Register Address */
while(SPI0CN0_SPIF==0);
i=SPI0DAT;
SPI0CN0_SPIF=0;
SPI0DAT=d; /* Send Register Address */
while(SPI0CN0_SPIF==0);
i=SPI0DAT;
}

复制代码

３、ｓｐｉ读１字节
unsigned char spi_read(void)
{
      unsigned char i;
      SPI0CN0_SPIF=0;
      SPI0DAT=0xff;                                     /* Send Register Address */
      while(SPI0CN0_SPIF==0);
      i=SPI0DAT;
      return i;
}

三、与Ｗ５５００有关的函数移植

/******************************* W5500 Write Operation *******************************/
/* Write W5500 Common Register a byte */
void Write_1_Byte(unsigned int data reg, unsigned char data dat)
{
/* Set W5500 SCS Low */
SPI_CS = 0; // -select the Slave
/* Write Address */
spi_writeint(reg);
/* Write Control Byte */
spi_writechar(FDM1|RWB_WRITE|COMMON_R);
/* Write 1 byte */
spi_writechar(dat);
/* Set W5500 SCS High */
SPI_CS = 1; // De-select the Slave
}
/* Write W5500 Common Register 2 bytes */
void Write_2_Byte(unsigned int data reg, unsigned char data *dat_ptr)
{
/* Set W5500 SCS Low */
SPI_CS=0;
/* Write Address */
spi_writeint(reg);
/* Write Control Byte */
spi_writechar(FDM2|RWB_WRITE|COMMON_R);
/* Write 2 bytes */
spi_writechar(*dat_ptr++);
spi_writechar(*dat_ptr);
/* Set W5500 SCS High */
SPI_CS=1;;
}
/* Write W5500 Common Register n bytes */
void Write_Bytes(unsigned int data reg, unsigned char data *dat_ptr, unsigned int data size)
{
unsigned int i;
/* Set W5500 SCS Low */
SPI_CS=0;
/* Write Address */
spi_writeint(reg);
/* Write Control Byte */
spi_writechar(VDM|RWB_WRITE|COMMON_R);
/* Write n bytes */
for(i=0;i
{
spi_writechar(*dat_ptr++);
}
/* Set W5500 SCS High */
SPI_CS=1;
}
/* Write W5500 Socket Register 1 byte */
void Write_SOCK_1_Byte(SOCKET data s, unsigned int data reg, unsigned char data dat)
{
/* Set W5500 SCS Low */
SPI_CS=0;
/* Write Address */
spi_writeint(reg);
/* Write Control Byte */
spi_writechar(FDM1|RWB_WRITE|(s*0x20+0x08));
/* Write 1 byte */
spi_writechar(dat);
/* Set W5500 SCS High */
SPI_CS=1;
}
/* Write W5500 Socket Register 2 byte */
void Write_SOCK_2_Byte(SOCKET data s, unsigned int data reg, unsigned int data dat)
{
/* Set W5500 SCS Low */
SPI_CS=0;
/* Write Address */
spi_writeint(reg);
/* Write Control Byte */
spi_writechar(FDM2|RWB_WRITE|(s*0x20+0x08));
/* Write 2 bytes */
spi_writeint(dat);
/* Set W5500 SCS High */
SPI_CS=1;
}
/* Write W5500 Socket Register 2 byte */
void Write_SOCK_4_Byte(SOCKET data s, unsigned int data reg, unsigned char data *dat_ptr)
{
unsigned char i;
/* Set W5500 SCS Low */
SPI_CS=0;
/* Write Address */
spi_writeint(reg);
/* Write Control Byte */
spi_writechar(FDM4|RWB_WRITE|(s*0x20+0x08));
/* Write 4 bytes */
for(i=0;i<4;i++)
spi_writechar(*dat_ptr++);
/* Set W5500 SCS High */
SPI_CS=1;
}
/******************************* W5500 Read Operation *******************************/
/* Read W5500 Common register 1 Byte */
unsigned char Read_1_Byte(unsigned int data reg)
{
unsigned char data i;
/* Set W5500 SCS Low */
SPI_CS=0;
/* Write Address */
spi_writeint(reg);
/* Write Control Byte */
spi_writechar(FDM1|RWB_READ|COMMON_R);
/* Write a dummy byte */
i = spi_read();
/* Set W5500 SCS High*/
SPI_CS=1;
return i;
}
/* Read W5500 Socket register 1 Byte */
unsigned char Read_SOCK_1_Byte(SOCKET data s, unsigned int data reg)
{
unsigned char data i;
/* Set W5500 SCS Low */
SPI_CS=0;
/* Write Address */
spi_writeint(reg);
/* Write Control Byte */
spi_writechar(FDM1|RWB_READ|(s*0x20+0x08));
/* Write a dummy byte */
i = spi_read();
/* Set W5500 SCS High*/
SPI_CS=1;
return i;
}
/* Read W5500 Socket register 2 Bytes */
unsigned int Read_SOCK_2_Byte(SOCKET data s, unsigned int data reg)
{
unsigned int data i;
/* Set W5500 SCS Low */
SPI_CS=0;
/* Write Address */
spi_writeint(reg);
/* Write Control Byte */
spi_writechar(FDM2|RWB_READ|(s*0x20+0x08));
// i=SPI0DAT;
/* Write a dummy byte */
SPI0CN0_SPIF=0;
i = spi_read();
i*=256;
i += spi_read();
/* Set W5500 SCS High*/
SPI_CS=1;
return i;
}
/******************** Read data from W5500 Socket data RX Buffer *******************/
unsigned int Read_SOCK_Data_Buffer(SOCKET data s, unsigned char xdata *dat_ptr)
{
unsigned int data rx_size;
unsigned int data offset, offset1;
unsigned int data i;
rx_size=Read_SOCK_2_Byte(s,Sn_RX_RSR);
if(rx_size==0) /* if no data received, return */
return 0;
if(rx_size>1460)
rx_size=1460;
offset=Read_SOCK_2_Byte(s,Sn_RX_RD);
offset1=offset;
offset&=(S_RX_SIZE-1); /* Calculate the real physical address */
/* Set W5500 SCS Low */
SPI_CS=0;
/* Write Address */
spi_writeint(offset);
/* Write Control Byte */
spi_writechar(VDM|RWB_READ|(s*0x20+0x18));
if((offset+rx_size)
{
/* Read Data */
for(i=0;i
{
*dat_ptr++ = spi_read();
}
}
else
{
offset=S_RX_SIZE-offset;
for(i=0;i
{
*dat_ptr++ = spi_read();
}
/* Set W5500 SCS High*/
SPI_CS=1;
/* Set W5500 SCS Low */
SPI_CS=0;
/* Write Address */
spi_writeint(0);
/* Write Control Byte */
spi_writechar(VDM|RWB_READ|(s*0x20+0x18));
/* Read Data */
for(;i
{
*dat_ptr++ = spi_read();
}
}
/* Set W5500 SCS High*/
SPI_CS=1;
/* Update offset*/
offset1+=rx_size;
Write_SOCK_2_Byte(s, Sn_RX_RD, offset1);
Write_SOCK_1_Byte(s, Sn_CR, RECV); /* Write RECV Command */
return rx_size;
}