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;
    }
}

Diff: Protocols/SPI16.h

Revision:
1:ff019d22b275
Child:
4:12ba0ecc2c1f
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Protocols/SPI16.h	Fri Feb 13 15:25:10 2015 +0000
@@ -0,0 +1,107 @@
+#ifndef SPI16_H
+#define SPI16_H
+
+#include "mbed.h"
+#include "Protocols.h"
+//#include "GraphicsDisplay.h"
+
+class SPI16 : public Protocols
+{
+ public:
+
+    /** Create an SPI 8bit display interface with 3 control pins
+    *
+    * @param SPI mosi
+    * @param SPI miso
+    * @param SPI sclk
+    * @param CS pin connected to CS of display
+    * @param reset pin connected to RESET of display
+    * @param DC pin connected to data/command of display
+    */ 
+    SPI16(int Hz, PinName mosi, PinName miso, PinName sclk, PinName CS, PinName reset, PinName DC);
+ 
+protected:
+   
+    /** Send 8bit command to display controller 
+    *
+    * @note switches spi format 16->8->16, better use wr_cmd16 with NOP in front 
+    * @param cmd: byte to send  
+    *
+    */   
+    virtual void wr_cmd8(unsigned char cmd);
+    
+    /** Send 8bit data to display controller 
+    *
+    * @note switches spi format 16->8->16, better use wr_data16 with repeated byte (if does not hurt)
+    * @param data: byte to send   
+    *
+    */   
+    virtual void wr_data8(unsigned char data);
+    
+    /** Send same 8bit data to display controller multiple times
+    *
+    * @note switches spi format 16->8->16, better use wr_data16
+    * @param data: byte to send
+    * @param count: how many
+    *
+    */   
+    virtual void wr_data8(unsigned char data, unsigned int count);
+    
+    /** Send array of data bytes to display controller
+    *
+    * @note switches spi format 16->8->16, better use wr_data16
+    * @param data: unsigned char data array
+    * @param lenght: lenght of array
+    *
+    */   
+    virtual void wr_data8buf(unsigned char* data, unsigned int lenght);
+    
+    /** Send 16bit command to display controller 
+    *
+    * @param cmd: halfword to send  
+    *
+    */   
+    virtual void wr_cmd16(unsigned short cmd);
+    
+    /** Send 16bit data to display controller 
+    *
+    * @param data: halfword to send   
+    *
+    */   
+    virtual void wr_data16(unsigned short data);
+    
+    /** Send same 16bit data to display controller multiple times
+    *
+    * @param data: halfword to send
+    * @param count: how many
+    *
+    */   
+    virtual void wr_data16(unsigned short data, unsigned int count);
+    
+    /** Send array of data shorts to display controller
+    *
+    * @param data: unsigned short data array
+    * @param lenght: lenght (in shorts)
+    *
+    */   
+    virtual void wr_data16buf(unsigned short* data, unsigned int lenght);
+    
+    /** HW reset sequence (without display init commands)   
+    */
+    virtual void hw_reset();
+    
+    /** Set ChipSelect high or low
+    * @param enable 0/1   
+    */
+    virtual void BusEnable(bool enable);
+  
+    DigitalOut _CS;
+
+private:
+
+    SPI _spi;
+    DigitalOut _reset;
+    DigitalOut _DC;
+  
+};
+#endif
\ No newline at end of file