[PUYA] Applied ESPeasy puya_v3.patch

Applied the patch to get the starting point as described in esp8266#5493

Author: TD-er

cores/esp8266/Esp.cpp

@@ -569,11 +569,33 @@ bool EspClass::flashEraseSector(uint32_t sector) {
     return rc == 0;
 }
 
+static uint32_t flash_chip_id = 0;
+
+bool EspClass::flashIsPuya(){
+    return ((flash_chip_id & 0x000000ff) == 0x85); // 0x146085 PUYA
+}
+
 bool EspClass::flashWrite(uint32_t offset, uint32_t *data, size_t size) {
-    ets_isr_mask(FLASH_INT_MASK);
-    int rc = spi_flash_write(offset, (uint32_t*) data, size);
-    ets_isr_unmask(FLASH_INT_MASK);
-    return rc == 0;
+	if (flash_chip_id == 0)
+		flash_chip_id = getFlashChipId();
+	ets_isr_mask(FLASH_INT_MASK);
+	int rc;
+	uint32_t* ptr = data;
+	if (flashIsPuya()) {
+		static uint32_t read_buf[SPI_FLASH_SEC_SIZE / 4];
+		rc = spi_flash_read(offset, read_buf, size);
+		if (rc != 0) {
+			ets_isr_unmask(FLASH_INT_MASK);
+			return false;
+		}
+		for (size_t i = 0; i < size / 4; ++i) {
+			read_buf[i] &= data[i];
+		}
+		ptr = read_buf;
+	}
+	rc = spi_flash_write(offset, ptr, size);
+	ets_isr_unmask(FLASH_INT_MASK);
+	return rc == 0;
 }
 
 bool EspClass::flashRead(uint32_t offset, uint32_t *data, size_t size) {

cores/esp8266/Esp.h

@@ -23,6 +23,8 @@
 
 #include <Arduino.h>
 
+#define PUYASUPPORT
+
 /**
  * AVR macros for WDT managment
  */
@@ -141,6 +143,7 @@ class EspClass {
         bool flashWrite(uint32_t offset, uint32_t *data, size_t size);
         bool flashRead(uint32_t offset, uint32_t *data, size_t size);
 
+        bool flashIsPuya();
         uint32_t getSketchSize();
         String getSketchMD5();
         uint32_t getFreeSketchSpace();