#include "soft_spi.h"
T_U8 spiCurDev = 0xff;
T_U32 spiClkDelay[SPI_DEV_NUM];
void Spi_Init(void)
{
T_U32 i, clkDelay;
SPI_IO_INIT();
clkDelay = 1000000000 / SPI_DEFAULT_FREQ / 2;
if(clkDelay == 0)
{
clkDelay = 1;
}
for(i = 0; i < SPI_DEV_NUM; i++)
{
spiClkDelay[i] = clkDelay;
}
}
void Spi_SetClk(T_U32 clk, T_U8 dev)
{
T_U32 delay;
if(clk > SPI_MAX_FREQ)
{
clk = SPI_MAX_FREQ;
}
delay = 1000000000 / clk / 2;
if(delay == 0)
{
delay = 1;
}
spiClkDelay[dev] = delay;
}
void Spi_SelectDev(T_U8 dev)
{
if(dev >= SPI_DEV_NUM)
{
SPI_DEBUG("#error spi dev num:%d\n", dev);
return;
}
SPI_CS_ASSERT(dev);
spiCurDev = dev;
}
void Spi_DeselectDev(void)
{
if(spiCurDev >= SPI_DEV_NUM)
{
SPI_DEBUG("#error spi no selected dev\n");
return;
}
SPI_CS_DEASSERT(spiCurDev);
spiCurDev = 0xff;
}
#if(SPI_CPHA == 0 && SPI_CPOL == 0)
T_U8 Spi_SendByte(T_U8 dat)
{
T_U8 recv = 0;
T_U32 t = spiClkDelay[spiCurDev];
T_S32 i = 0;
#if(SPI_MSB)
for(i = 8; i > 0; i--)
#else
for(i = 0; i < 8; i++)
#endif
{
#if(SPI_MSB)
if(dat & (1<<(i-1)))
#else
if(dat & (1<<i))
#endif
{
SPI_MOSI_SET();
}
else
{
SPI_MOSI_CLEAR();
}
DelayNs(t);
SPI_CLK_SET();
#if(SPI_MSB)
recv <<= 1;
if(SPI_MISO_GET())
{
recv |= 0x01;
}
#else
recv >>= 1;
if(SPI_MISO_GET())
{
recv |= 0x80;
}
#endif
DelayNs(t);
SPI_CLK_CLEAR();
}
return recv;
}
#elif(SPI_CPHA == 1 && SPI_CPOL == 1)
T_U8 Spi_SendByte(T_U8 dat)
{
T_U8 recv = 0;
T_U32 t = spiClkDelay[spiCurDev];
T_S32 i = 0;
#if(SPI_MSB)
for(i = 8; i > 0; i--)
#else
for(i = 0; i < 8; i++)
#endif
{
SPI_CLK_CLEAR();
#if(SPI_MSB)
if(dat & (1<<(i-1)))
#else
if(dat & (1<<i))
#endif
{
SPI_MOSI_SET();
}
else
{
SPI_MOSI_CLEAR();
}
DelayNs(t);
SPI_CLK_SET();
#if(SPI_MSB)
recv <<= 1;
if(SPI_MISO_GET())
{
recv |= 0x01;
}
#else
recv >>= 1;
if(SPI_MISO_GET())
{
recv |= 0x80;
}
#endif
DelayNs(t);
}
return recv;
}
#else
#error spi config error
#endif
T_U8 Spi_SendBytes(T_U32 len, T_U8 *pDat)
{
T_U32 i;
T_U8 recv;
for(i = 0; i < len; i++)
{
recv = Spi_SendByte(*pDat++);
}
return recv;
}
T_U8 Spi_ReadByte(T_U8 send)
{
T_U8 recv;
recv = Spi_SendByte(send);
return recv;
}
void Spi_ReadBytes(T_U8 send, T_U32 len, T_U8 *pBuf)
{
T_U32 i;
for(i = 0; i < len; i++)
{
*pBuf++ = Spi_SendByte(send);
}
}
