Darren Ulrich / UniGraphic

Added SPI burst mode to spi 8 bit.

Dependents:   Bicycl_Computer_NUCLEO-F411RE Bicycl_Computer_NUCLEO-L476RG

Fork of UniGraphic by GraphicsDisplay

Added SPI burst mode to this graphics driver. If whoever wants this rolled in to repository let me know. I replaced _spi.write(); with fastWrite(); and clearRX();

SPI8.cpp

// need to re-create SPI firmware to access SPI handle
static SPI_HandleTypeDef SpiHandle;

void SPI8::fastWrite(int data) {
    
      SpiHandle.Instance = SPI1;
    // Check if data is transmitted
    while ((SpiHandle.Instance->SR & SPI_SR_TXE) == 0);
    SpiHandle.Instance->DR = data;
}
    
void SPI8::clearRX( void ) {
        SpiHandle.Instance = SPI1;
    //Check if the RX buffer is busy
    //While busy, keep checking
    while (SpiHandle.Instance->SR & SPI_SR_BSY){   
        // Check RX buffer readable
        while ((SpiHandle.Instance->SR & SPI_SR_RXNE) == 0);
        int dummy = SpiHandle.Instance->DR;
    }
}

Protocols/SPI8.cpp

Committer:
Geremia
Date:
2015-02-13
Revision:
1:ff019d22b275
Parent:
0:75ec1b3cde17
Child:
4:12ba0ecc2c1f

File content as of revision 1:ff019d22b275:

#include "SPI8.h"

//#define USE_CS

SPI8::SPI8(int Hz, PinName mosi, PinName miso, PinName sclk, PinName CS, PinName reset, PinName DC)
    : _CS(CS), _spi(mosi, miso, sclk), _reset(reset), _DC(DC)
{
    _reset = 1;
    _DC=1;
    _CS=1;
    _spi.format(8,0);                  // 8 bit spi mode 0
 //   _spi.frequency(12000000);          // 10 Mhz SPI clock, 12mhz for F411
    _spi.frequency(Hz);
    hw_reset();    
}

void SPI8::wr_cmd8(unsigned char cmd)
{   
#ifdef USE_CS
    _CS = 0;
#endif    
    _DC.write(0); // 0=cmd
    _spi.write(cmd);      // write 8bit
#ifdef USE_CS
    _CS = 1;
#endif
}
void SPI8::wr_data8(unsigned char data)
{
#ifdef USE_CS
    _CS = 0;
#endif
    _DC.write(1); // 1=data
    _spi.write(data);    // write 8bit
#ifdef USE_CS
    _CS = 1;
#endif
}
void SPI8::wr_data8(unsigned char data, unsigned int count)
{
#ifdef USE_CS
    _CS = 0;
#endif
    _DC.write(1); // 1=data
    while(count)
    {
        _spi.write(data);    // write 8bit
        count--;
    }
#ifdef USE_CS
    _CS = 1;
#endif
}
void SPI8::wr_data8buf(unsigned char* data, unsigned int lenght)
{
#ifdef USE_CS
    _CS = 0;
#endif
    _DC.write(1); // 1=data
    while(lenght)
    {
        _spi.write(*data++);    // write 8bit
       // data++;
        lenght--;
    }
#ifdef USE_CS
    _CS = 1;
#endif
}
void SPI8::wr_cmd16(unsigned short cmd)
{   
#ifdef USE_CS
    _CS = 0;
#endif    
    _DC.write(0); // 0=cmd
    _spi.write(cmd>>8);      // write 8bit
    _spi.write(cmd&0xFF);      // write 8bit
#ifdef USE_CS
    _CS = 1;
#endif
}
void SPI8::wr_data16(unsigned short data)
{
#ifdef USE_CS
    _CS = 0;
#endif
    _DC.write(1); // 1=data
    _spi.write(data>>8);    // write 8bit
    _spi.write(data&0xFF);    // write 8bit
#ifdef USE_CS
    _CS = 1;
#endif
}
void SPI8::wr_data16(unsigned short data, unsigned int count)
{
#ifdef USE_CS
    _CS = 0;
#endif
    _DC.write(1); // 1=data
    if((data>>8)==(data&0xFF))
    {
        count<<=1;
        while(count)
        {
            _spi.write(data);    // write 8bit
            count--;
        }
    }
    else
    {
        while(count)
        {
            _spi.write(data>>8);    // write 8bit
            _spi.write(data&0xFF);    // write 8bit
            count--;
        }
    }
#ifdef USE_CS
    _CS = 1;
#endif
}
void SPI8::wr_data16buf(unsigned short* data, unsigned int lenght)
{
#ifdef USE_CS
    _CS = 0;
#endif
    _DC.write(1); // 1=data
    while(lenght)
    {
        _spi.write((*data)>>8);    // write 8bit
        _spi.write((*data)&0xFF);    // write 8bit
        data++;
        lenght--;
    }
#ifdef USE_CS
    _CS = 1;
#endif
}
void SPI8::hw_reset()
{
    wait_ms(15);
    _DC = 1;
 //   _CS = 1;
    _CS = 0;
    _reset = 0;                        // display reset
    wait_us(50);
    _reset = 1;                       // end reset
    wait_ms(15);
#ifndef USE_CS
    _CS=0;      // put CS low now and forever
#endif
}
void SPI8::BusEnable(bool enable)
{
    _CS = enable ? 0:1;
}