Added GPIO expander functionality for the EPDiy_V7 PCB

Author: bitbank2

src/FastEPD.cpp

@@ -110,6 +110,27 @@ int FASTEPD::setMode(int iMode)
     return bbepSetMode(&_state, iMode);
   /* setMode() */
 }
+void FASTEPD::ioPinMode(uint8_t u8Pin, uint8_t iMode)
+{
+    if (_state.pfnExtIO) {
+        (*_state.pfnExtIO)(BB_EXTIO_SET_MODE, u8Pin, iMode);
+    }
+}
+void FASTEPD::ioWrite(uint8_t u8Pin, uint8_t iValue)
+{
+    if (_state.pfnExtIO) {
+        (*_state.pfnExtIO)(BB_EXTIO_WRITE, u8Pin, iValue);
+    }
+}
+uint8_t FASTEPD::ioRead(uint8_t u8Pin)
+{
+    uint8_t val = 0;
+    if (_state.pfnExtIO) {
+        val = (*_state.pfnExtIO)(BB_EXTIO_READ, u8Pin, 0);
+    }
+    return val;
+}
+
 void FASTEPD::setFont(int iFont)
 {
     _state.iFont = iFont;
@@ -125,6 +146,11 @@ void FASTEPD::setFont(const void *pFont, bool bAntiAlias)
     _state.anti_alias = (uint8_t)bAntiAlias;
 } /* setFont() */
 
+void FASTEPD::setTextWrap(bool bWrap)
+{
+    bbepSetTextWrap(&_state, (int)bWrap); 
+} /* setTextWrap() */
+
 void FASTEPD::setTextColor(int iFG, int iBG)
 {
     _state.iFG = iFG;
@@ -196,7 +222,12 @@ int FASTEPD::initCustomPanel(BBPANELDEF *pPanel, BBPANELPROCS *pProcs)
     _state.pfnIOInit = pProcs->pfnIOInit;
     _state.pfnRowControl = pProcs->pfnRowControl;
     return (*(_state.pfnIOInit))(&_state);
-} /* setPanelType() */
+} /* initCustomPanel() */
+
+int FASTEPD::setPanelSize(int iPanel)
+{
+    return bbepSetDefinedPanel(&_state, iPanel);
+}
 
 int FASTEPD::setPanelSize(int width, int height, int flags) {
     return bbepSetPanelSize(&_state, width, height, flags);

src/FastEPD.h

@@ -63,6 +63,16 @@ enum {
     BB_PANEL_CUSTOM,
     BB_PANEL_COUNT
 };
+
+// Pre-configured displays
+enum {
+    BBEP_DISPLAY_EC060TC1,
+    BBEP_DISPLAY_ED0970TC1,
+    BBEP_DISPLAY_ED103TC2,
+    BBEP_DISPLAY_ED052TC4,
+    BBEP_DISPLAY_COUNT
+};
+
 // A complete description of an EPD panel
 typedef struct _paneldef {
     uint16_t width;
@@ -96,6 +106,14 @@ typedef struct bbepr {
     int h;
 } BBEPRECT;
 
+// To access external IO through a single function pointer
+// This enum defines the operation
+enum {
+    BB_EXTIO_SET_MODE=0,
+    BB_EXTIO_WRITE,
+    BB_EXTIO_READ
+};
+
 // Display clearing pass type
 enum {
     BB_CLEAR_LIGHTEN = 0,
@@ -143,13 +161,16 @@ typedef int (BB_IO_INIT)(void *pBBEP);
 typedef void (BB_IO_DEINIT)(void *pBBEP);
 // Callback function for controlling the row start/step
 typedef void (BB_ROW_CONTROL)(void *pBBEP, int iMode);
+// Callback function to access external IO expanders
+typedef uint8_t (BB_EXT_IO)(uint8_t iOP, uint8_t iPin, uint8_t iValue);
 
 typedef struct tag_bbeppanelprocs
 {
     BB_EINK_POWER *pfnEinkPower;
     BB_IO_INIT *pfnIOInit;
     BB_ROW_CONTROL *pfnRowControl;
     BB_IO_DEINIT *pfnIODeInit;
+    BB_EXT_IO *pfnExtIO;
 } BBPANELPROCS;
 
 typedef struct tag_fastepdstate
@@ -172,6 +193,7 @@ typedef struct tag_fastepdstate
     BB_SET_PIXEL *pfnSetPixel;
     BB_SET_PIXEL_FAST *pfnSetPixelFast;
     BB_EINK_POWER *pfnEinkPower;
+    BB_EXT_IO *pfnExtIO;
     BB_IO_INIT *pfnIOInit;
     BB_IO_DEINIT *pfnIODeInit;
     BB_ROW_CONTROL *pfnRowControl;
@@ -188,10 +210,14 @@ class FASTEPD
     FASTEPD() {memset(&_state, 0, sizeof(_state)); _state.iFont = FONT_8x8; _state.iFG = BBEP_BLACK;}
     int initPanel(int iPanelType);
     int initCustomPanel(BBPANELDEF *pPanel, BBPANELPROCS *pProcs);
+    int setPanelSize(int iPanel);
     int setCustomMatrix(const uint8_t *pMatrix, size_t matrix_size);
     int setPanelSize(int width, int height, int flags = BB_PANEL_FLAG_NONE);
     int getStringBox(const char *text, BBEPRECT *pRect);
     int setMode(int iMode); // set graphics mode
+    void ioPinMode(uint8_t u8Pin, uint8_t iMode);
+    void ioWrite(uint8_t u8Pin, uint8_t iValue);
+    uint8_t ioRead(uint8_t u8Pin);
     int getMode(void) {return _state.mode;}
     uint8_t *previousBuffer(void) { return _state.pPrevious;}
     uint8_t *currentBuffer(void) { return _state.pCurrent;}