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: Graphics/TextDisplay.h

Revision:
4:12ba0ecc2c1f
Parent:
0:75ec1b3cde17
--- a/Graphics/TextDisplay.h	Sat Feb 14 17:42:21 2015 +0000
+++ b/Graphics/TextDisplay.h	Sun Feb 15 20:06:07 2015 +0000
@@ -98,8 +98,8 @@
     int _row;
 
     // colours
-    uint16_t _foreground;
-    uint16_t _background;
+    volatile uint16_t _foreground;
+    volatile uint16_t _background;
     char *_path;
 };