修复Flash操作返回失败，及log_end_add返回块首址造成无法写log。

demo/env/stm32f10x/rtt/components/easyflash/port/ef_port.c

@@ -143,6 +143,8 @@ EfErrCode ef_port_write(uint32_t addr, const uint32_t *buf, size_t size) {
     FLASH_ClearFlag(FLASH_FLAG_BSY | FLASH_FLAG_EOP | FLASH_FLAG_PGERR | FLASH_FLAG_WRPRTERR);
     for (i = 0; i < size; i += 4, buf++, addr += 4) {
         /* write data */
+		read_data = *(uint32_t *)addr;
+		if (read_data != *buf) {
 			FLASH_ProgramWord(addr, *buf);
 			read_data = *(uint32_t *)addr;
 			/* check data */
@@ -151,6 +153,7 @@ EfErrCode ef_port_write(uint32_t addr, const uint32_t *buf, size_t size) {
 				break;
 			}
 		}
+    }
     FLASH_Lock();
 
     return result;

easyflash/src/ef_log.c

@@ -239,7 +239,7 @@ static uint32_t find_sec_using_end_addr(uint32_t addr) {
         return sector_start + EF_ERASE_MIN_SIZE - continue_ff;
     } else {
         /* all sector not has continuous 0xFF, so the sector is full */
-        return sector_start + EF_ERASE_MIN_SIZE;
+        return sector_start + EF_ERASE_MIN_SIZE+LOG_SECTOR_HEADER_SIZE;
     }
 }