差别

这里会显示出您选择的修订版和当前版本之间的差别。

--- knowledge:3d_print:2022102301 [2022/10/23 12:01] – 弘毅
+++ knowledge:3d_print:2022102301 [2023/06/14 12:34] (当前版本) – 弘毅
@@ 行 6: / 行 6: @@
 static void xflash_err_msg()
 {
-	lcd_clear();
+  lcd_clear();
-	lcd_puts_P(_n("External SPI flash\nXFLASH is not res-\nponding. Language\nswitch unavailable."));
+  lcd_puts_P(_n("External SPI flash\nXFLASH is not res-\nponding. Language\nswitch unavailable."));
 }
 // "Setup" function is called by the Arduino framework on startup.
 // Before startup, the Timers-functions (PWM)/Analog RW and HardwareSerial provided by the Arduino-code
 // are initialized by the main() routine provided by the Arduino framework.
 void setup()
 {
-	timer2_init(); // enables functional millis
+  timer2_init(); // enables functional millis
-	mmu_init();
+  mmu_init();
-	ultralcd_init();
+  ultralcd_init();
-	spi_init();
+  spi_init();
-	lcd_splash();
+  lcd_splash();
-    Sound_Init();                                // also guarantee "SET_OUTPUT(BEEPER)"
+  Sound_Init();                                // also guarantee "SET_OUTPUT(BEEPER)"
-	selectedSerialPort = eeprom_read_byte((uint8_t *)EEPROM_SECOND_SERIAL_ACTIVE);
+  selectedSerialPort = eeprom_read_byte((uint8_t *)EEPROM_SECOND_SERIAL_ACTIVE);
-	if (selectedSerialPort == 0xFF) selectedSerialPort = 0;
+  if (selectedSerialPort == 0xFF) selectedSerialPort = 0;
-	eeprom_update_byte((uint8_t *)EEPROM_SECOND_SERIAL_ACTIVE, selectedSerialPort);
+  eeprom_update_byte((uint8_t *)EEPROM_SECOND_SERIAL_ACTIVE, selectedSerialPort);
-	MYSERIAL.begin(BAUDRATE);
+  MYSERIAL.begin(BAUDRATE);
-	fdev_setup_stream(uartout, uart_putchar, NULL, _FDEV_SETUP_WRITE); //setup uart out stream
+  fdev_setup_stream(uartout, uart_putchar, NULL, _FDEV_SETUP_WRITE); //setup uart out stream
-	stdout = uartout;
+  stdout = uartout;
 #ifdef XFLASH
-    bool xflash_success = xflash_init();
+  bool xflash_success = xflash_init();
-	uint8_t optiboot_status = 1;
+  uint8_t optiboot_status = 1;
-	if (xflash_success)
+  if (xflash_success)
-	{
+  {
-		optiboot_status = optiboot_xflash_enter();
+    optiboot_status = optiboot_xflash_enter();
 #if (LANG_MODE != 0) //secondary language support
-        update_sec_lang_from_external_flash();
+    update_sec_lang_from_external_flash();
 #endif //(LANG_MODE != 0)
-	}
+  }
-	else
+  else
-	{
+  {
-	    xflash_err_msg();
+    xflash_err_msg();
-	}
+  }
 #else
-	const bool xflash_success = true;
+  const bool xflash_success = true;
 #endif //XFLASH
 </code>
-通过查看源码，发现该错误信息是Arduino的Setup函数初始化中显示的。
+通过查看源码，发现该错误信息是Arduino的Setup函数初始化中显示的。是否error是又xflash_init()函数返回的数据决定。
+我们在xflash.c的51行找到该函数。他初始化XFLASH_PIN_CS引脚为SPI的CS引脚，然后执行xflash_mfrid_devid()函数判断返回。
+XFLASH_PIN_CS是Arduino MEGA2560的D32引脚，也就是PC5.
+<code>
+int xflash_mfrid_devid(void);
+int8_t xflash_init(void)
+{
+  _CS_HIGH();
+  SET_OUTPUT(XFLASH_PIN_CS);
+  XFLASH_SPI_ENTER();
+  if (!xflash_mfrid_devid()) return 0;
+  return 1;
+}
+</code>
+xflash_mfrid_devid()函数在xflash.c的193行，主要还是与Flash进行通信，获取Flash的型号。以此来确认是否通信成功。
+<code>
+int xflash_mfrid_devid(void)
+{
+  _CS_LOW();
+  _SPI_TX(_CMD_MFRID_DEVID);           // send command 0x90
+  uint8_t cnt = 3;                     // 3 address bytes
+  while (cnt--)                        // send address bytes
+    _SPI_TX(0x00);
+  uint8_t xflash_mfrid = _SPI_RX();  // receive mfrid
+  uint8_t xflash_devid = _SPI_RX();  // receive devid
+  _CS_HIGH();
+  return
+    ((xflash_mfrid == _MFRID_W25X20CL) && (xflash_devid == _DEVID_W25X20CL)) ||
+    ((xflash_mfrid == _MFRID_GD25Q20C) && (xflash_devid == _DEVID_GD25Q20C));
+}
+</code>
+通过测试，发现该问题会有LCD2004硬件的SD卡CS到主控接触不良引起。当LCD2004的SD卡的CS到主控接触不良时，就会引起这个错误。