spi.rar_spi 全双工_模拟SPI_模拟spi通信_软件SPI_软件模拟spi

#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); } }