idf proposed fixes. Tested also in Arduino IDE

Author: martinberlin

src/FastEPD.inl

@@ -17,7 +17,7 @@
 #include "FastEPD.h"
 #include <esp_lcd_panel_io.h>
 #include <esp_lcd_panel_ops.h>
-
+#include <esp_log.h>
 #if PSRAM != enabled && !defined(CONFIG_ESP32_SPIRAM_SUPPORT) && !defined(CONFIG_ESP32S3_SPIRAM_SUPPORT)
 #error "Please enable PSRAM support"
 #endif
@@ -939,6 +939,7 @@ void bbepWriteRow(FASTEPDSTATE *pState, uint8_t *pData, int iLen)
     }
     while (!transfer_is_done) {
         delayMicroseconds(1);
+        vTaskDelay(0);
     }
 } /* bbepWriteRow() */
 
@@ -955,6 +956,9 @@ uint8_t ucTemp[4];
 //
 int bbepIOInit(FASTEPDSTATE *pState)
 {
+    #ifndef ARDUINO
+        esp_log_level_set("gpio", ESP_LOG_NONE);
+    #endif
     int rc = (*(pState->pfnIOInit))(pState);
     if (rc != BBEP_SUCCESS) return rc;
     // Initialize the ESP32 LCD API to drive parallel data at high speed
@@ -1351,6 +1355,7 @@ int bbepFullUpdate(FASTEPDSTATE *pState, bool bFast, bool bKeepOn, BBEPRECT *pRe
                             d[n + 3] = (pGrayUpper[pass * 256 + s[6]] | pGrayLower[pass * 256 + s[7]]);
                             s += 8;
                         } // for j
+                        vTaskDelay(0);
                     }
                     if (iStartCol > 0 || iEndCol < pState->native_width-1) { // There is a region rectangle defined, clip the output to it
                         uint32_t *src, *dst;

src/arduino_io.inl

@@ -29,9 +29,9 @@ static uint8_t u8SDA_Pin, u8SCL_Pin;
 static int iDelay = 1;
 #endif
 
+#include "rom/ets_sys.h"
 #ifndef ARDUINO
 #include "driver/gpio.h"
-#include "driver/i2c.h"
 #include "esp_timer.h"
 
 // GPIO modes
@@ -55,25 +55,11 @@ unsigned long millis(void)
 {
     return micros() / 1000;
 }
+
 void IRAM_ATTR delayMicroseconds(uint32_t us)
 {
-    uint32_t m = micros();
-    if (us)
-    {
-        uint32_t e = (m + us);
-        if (m > e)
-        { //overflow
-            while (micros() > e)
-            {
-                __asm__ __volatile__("nop\n");
-            }
-        }
-        while (micros() < e)
-        {
-            __asm__ __volatile__("nop\n");
-        }
-    }
-} /* delayMicroseconds() */
+    ets_delay_us(us);
+}
 
 void delay(uint32_t ms)
 {