fixes for AVR and rotated fonts

examples/atmega_clock/atmega_clock.ino

@@ -11,7 +11,8 @@
 #include "Roboto_Black_38.h"
 #include "Roboto_Black_78.h"
 #include <bb_epaper.h>
-BBEPAPER bbep(EPD42_400x300);
+BBEPAPER bbep(EPD295_128x296);
+//BBEPAPER bbep(EPD42B_400x300);
 static int iRunCount = 0;
 static int iSec, iMin, iHour, iWDay, iMDay, iMon;
 int iSleepTime; // number of microseconds to sleep in each wakeup phase
@@ -23,12 +24,17 @@ int iSleepTime; // number of microseconds to sleep in each wakeup phase
 #define RTC_ADDR RTC_DS3231_ADDR
 #define RTC_START_REG 0
 // Ugly solder job of Xiao ESP32-C6 and my e-paper adapter
-#define PIN_SDA 4
-#define PIN_SCL 3
-#define POWER_PIN 5
-#define PIN_DC 14
+//#define PIN_SDA 4
+//#define PIN_SCL 3
+//#define POWER_PIN 5
+//#define PIN_DC 14
+//#define PIN_BUSY 16
+//#define PIN_RST 15
+// Arduino Pro mini clone
+#define PIN_DC 15
 #define PIN_BUSY 16
-#define PIN_RST 15
+#define PIN_RST 14
+#define PIN_CS 10
 
 const char *szDays[7] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
 const char *szMonths[12] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
@@ -140,7 +146,7 @@ void DrawPlane(int bInvert, int iPlane, char *string1, char *string2)
       iFG = BBEP_BLACK; iBG = BBEP_WHITE;
     }
     bbep.setPlane(iPlane);
-    bbep.fillRect(0,0, bbep.width(), bbep.height(), iBG); // clear both buffers to white for full update
+    bbep.fillScreen(iBG); // clear both buffers to white for full update
     bbep.setFont(Roboto_Black_78);
     bbep.setTextColor(iFG, iBG);
     bbep.drawString(string1, CENTER_X, 120);
@@ -162,9 +168,9 @@ void loop()
     char szTemp[32] ,szTemp2[32];
     int bPartial, iSleepTime, bInvert;
     
-    bbep.initIO(PIN_DC, PIN_RST, PIN_BUSY);
+    bbep.initIO(PIN_DC, PIN_RST, PIN_BUSY, PIN_CS, MOSI, SCK, 4000000);
     while (1) {
-      bInvert = 1;
+      bInvert = 0;
       if ((iRunCount & 1) == 0) { // get time and update
           bPartial = ((iRunCount & 0x1f) != 0);
          rtc_get_time();
@@ -174,7 +180,7 @@ void loop()
         // the SSD16xx remembers the old properly and just needs to know the new
           if (bPartial) { // inverted too, with the old time strings
               DrawPlane(bInvert, PLANE_1, szTemp, szTemp2);
-              bInvert = 0;
+   //           bInvert = 0;
           }
         } // BBEP_CHIP_UC81xx
         // Print the current hour:minute

src/bb_ep.inl

@@ -1133,7 +1133,7 @@ void bbepSleep(BBEPDISP *pBBEP, int bDeep)
 
 void bbepStartWrite(BBEPDISP *pBBEP, int iPlane)
 {
-    uint8_t u8Cmd;
+    uint16_t u8Cmd; // AVR crashes w/odd number of bytes for stack vars
     
     if (!pBBEP) return;
     if (pBBEP->chip_type == BBEP_CHIP_UC81xx) {
@@ -1147,7 +1147,7 @@ void bbepStartWrite(BBEPDISP *pBBEP, int iPlane)
         else
             u8Cmd = SSD1608_WRITE_ALTRAM;
     }
-    bbepWriteCmd(pBBEP, u8Cmd);
+    bbepWriteCmd(pBBEP, (uint8_t)u8Cmd);
 } /* bbepStartWrite() */
 
 //
@@ -1264,7 +1264,7 @@ int bbepRefresh(BBEPDISP *pBBEP, int iMode)
         bbepWriteCmd(pBBEP, UC8151_PTOU); // partial out (update the entire panel, not just the last memory window)
         bbepWriteCmd(pBBEP, UC8151_DRF);
     } else {
-        const uint8_t u8CMD[3] = {0xf7, 0xc7, 0xff}; // normal, fast, partial
+        const uint8_t u8CMD[4] = {0xf7, 0xc7, 0xff, 0}; // normal, fast, partial
         if (pBBEP->iFlags & BBEP_3COLOR) {
             iMode = REFRESH_FAST;
         } // 3-color = 0xc7

src/bb_ep_gfx.inl

@@ -638,9 +638,10 @@ void bbepSetTextWrap(BBEPDISP *pBBEP, int bWrap)
 //
 void bbepWriteStringCustom(BBEPDISP *pBBEP, BB_FONT *pFont, int x, int y, char *szMsg, int iColor, uint8_t iPlane)
 {
-    int rc, i, h, w, end_y, dx, dy, tx, ty, iSrcPitch, iPitch;
-    unsigned int c;
-    uint8_t *s, bInvert = 0;
+    int rc, i, h, w, j, end_y, dx, dy, tx, ty, iSrcPitch, iPitch;
+    signed int n;
+    unsigned int c, bInvert = 0;
+    uint8_t *s, uc0, uc1;
     BB_GLYPH *pGlyph;
     uint8_t *pBits, u8CMD1, u8CMD2, u8CMD, u8EndMask;
     uint8_t first, last;
@@ -687,7 +688,9 @@ void bbepWriteStringCustom(BBEPDISP *pBBEP, BB_FONT *pFont, int x, int y, char *
             } else { // rotated
                 w = pgm_read_word(&pGlyph->height);
                 h = pgm_read_byte(&pGlyph->width);
-                dx = x + pgm_read_word(&pGlyph->yOffset); // offset from character UL to start drawing
+                n = pgm_read_word(&pGlyph->yOffset); // offset from character UL to start drawing
+                dx = x;
+                if (-n < w) dx -= (w+n); // since we draw from the baseline
                 dy = y + pgm_read_word(&pGlyph->xOffset);
             }
             if ((dy + h) > pBBEP->native_height) { // trim it
@@ -748,9 +751,10 @@ void bbepWriteStringCustom(BBEPDISP *pBBEP, BB_FONT *pFont, int x, int y, char *
                     u8Cache[iSrcPitch-1] &= u8EndMask; // clean pixels beyond character width
                     u8Cache[iSrcPitch] = 0;
                     if (dx & 7) { // need to shift it over by 1-7 bits
-                        uint8_t *s = u8Cache, uc1, uc0 = 0; // last shifted byte
-                        uint8_t n = dx & 7; // shift amount
-                        for (int j=0; j<w+7; j+= 8) {
+                        s = u8Cache;
+                        uc0 = 0; // last shifted byte
+                        n = dx & 7; // shift amount
+                        for (j=0; j<w+7; j+= 8) {
                             uc1 = *s;
                             uc0 |= (uc1 >> n);
                             *s++ = uc0;