DirectSPI.cpp

00001 #include "DirectSPI.h"
00002 
00003 #if defined(SPI_SR_TXE) && defined(SPI_SR_RXNE)
00004 #   define isTXE(spi)     (spi->SR & SPI_SR_TXE)
00005 #   define isRXNE(spi)    (spi->SR & SPI_SR_RXNE)
00006 #else
00007 #   error Unsupported MCU at this moment !
00008 #endif
00009 
00010 #define SPIBUF8(spi)   *(__IO uint8_t  *)&spi->DR
00011 #define SPIBUF16(spi)  spi->DR
00012 
00013 #if DEVICE_SPI_ASYNCH
00014     #define SPI_S(obj)    (( struct spi_s *)(obj))
00015     //#define SPI_S(obj)    (( struct spi_s *)(&(obj->spi)))
00016 #else
00017     #define SPI_S(obj)    (( struct spi_s *)(obj))
00018 #endif
00019 
00020 DirectSPI::DirectSPI(PinName mosi, PinName miso, PinName sclk) : SPI(mosi, miso, sclk) {
00021     spi = spi_get_id(mosi, miso, sclk, NC);
00022 #if TODO
00023     spiSend = is16bit ? &DirectSPI::spiSend16 : &DirectSPI::spiSend8;
00024 #endif
00025 }
00026 
00027 uint16_t DirectSPI::directWrite(uint16_t data) {
00028     if(_bits == 16){
00029         while(!isTXE(spi));
00030         SPIBUF16(spi) = data;
00031         while(!isRXNE(spi));
00032         return SPIBUF16(spi);
00033     } else {
00034         while(!isTXE(spi));
00035         SPIBUF8(spi) = data;
00036         while(!isRXNE(spi));
00037         return SPIBUF8(spi);
00038     }
00039 }
00040 
00041 uint16_t DirectSPI::directWrite8(uint16_t data) {
00042     while(!isTXE(spi));
00043     SPIBUF8(spi) = data;
00044     while(!isRXNE(spi));
00045     return SPIBUF8(spi);
00046 }
00047 
00048 uint16_t DirectSPI::directWrite16(uint16_t data) {
00049     while(!isTXE(spi));
00050     SPIBUF16(spi) = data;
00051     while(!isRXNE(spi));
00052     return SPIBUF16(spi);
00053 }
00054 
00055 SPI_TypeDef *DirectSPI::spi_get_id( PinName mosi, PinName miso, PinName sclk, PinName ssel) {
00056     // Determine the SPI to use
00057     SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
00058     SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
00059     SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
00060     SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
00061 
00062     SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
00063     SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
00064 
00065     return (SPI_TypeDef *) ( (SPIName)pinmap_merge(spi_data, spi_cntl) );
00066 }