7366_lib.cpp

00001 #include "mbed.h"
00002 #include "7366_lib.h"
00003 
00004 SPI_7366::SPI_7366(PinName SPI_MOSI, PinName SPI_MISO, PinName SPI_SCLK, PinName SPI_SSEL):SPI(SPI_MOSI,SPI_MISO, SPI_SCLK),select(SPI_SSEL, 1){
00005     this->sens=1;
00006     }
00007 
00008 void SPI_7366::setup(void){
00009     char rxBuffer[2];
00010     int rxLength = 0;
00011     int txLength = 2;
00012     char IR = WR|MDR0;
00013     char data = QUADRATURE_X1|FREE_RUN;
00014     char txBuffer[2] = {IR,data};
00015     this->lock();
00016     this->select = 0;
00017     this->write(txBuffer, txLength, rxBuffer, rxLength);
00018     this->select = 1;   
00019     this->unlock();
00020 
00021     
00022     IR = WR|MDR1;
00023     data = CONFIG_4BYTES|CPT_ENABLE;
00024     txBuffer[0] = IR;
00025     txBuffer[1] = data;
00026     this->lock();
00027     this->select = 0;
00028     this->write(txBuffer, txLength, rxBuffer, rxLength);
00029     this->select = 1;
00030     this->unlock();
00031     
00032     IR = CLR|CNTR;
00033     txBuffer[0] = IR;
00034     txLength = 1;
00035     this->lock();
00036     this->select = 0;
00037     this->write(txBuffer, txLength, rxBuffer, rxLength);
00038     this->select = 1;
00039     this->unlock();
00040     
00041     return;
00042     }
00043 void SPI_7366::set_as_inverted(void){
00044     this->sens = -1;
00045     return;
00046 }
00047 
00048 int32_t SPI_7366::read_value(){
00049     char rxBuffer[6] = {0,0,0,0,0,0};
00050     char rxLength = 0;
00051     char IR = LOAD|OTR;
00052     char txBuffer[1] = {IR};
00053     int txLength = 1;
00054     this->lock();
00055     this->select = 0;
00056     this->write(txBuffer, txLength, rxBuffer, rxLength);
00057     this->select = 1;
00058     this->unlock();
00059     
00060     IR = RD|OTR;
00061     txBuffer[0] = IR;
00062     txLength = 1;
00063     rxLength = 5;
00064     this->lock();
00065     this->select = 0;
00066     this->write(txBuffer, txLength, rxBuffer, rxLength);
00067     this->select = 1;
00068     this->unlock();
00069     int32_t resultat = (rxBuffer[1]<<24) + (rxBuffer[2]<<16) + (rxBuffer[3]<<8) + (rxBuffer[4]<<0);
00070     return sens*resultat;
00071     }