knowledge:3d_print:2022102301

差别

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--- knowledge:3d_print:2022102301 [2022/10/23 11:58] – 创建弘毅
+++ knowledge:3d_print:2022102301 [2023/06/14 12:32] – 弘毅
@@ 行 3: / 行 3: @@
 该错误一个最直观的影响就是Blet test操作是无法显示数值的，一直显示0.
 源码文件Marlin_main.cpp 1052行 1093行 1331行均是相关代码
+<code>
+static void xflash_err_msg()
+{
+  lcd_clear();
+  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
+  mmu_init();
+  ultralcd_init();
+  spi_init();
+  lcd_splash();
+  Sound_Init();                                // also guarantee "SET_OUTPUT(BEEPER)"
+  selectedSerialPort = eeprom_read_byte((uint8_t *)EEPROM_SECOND_SERIAL_ACTIVE);
+  if (selectedSerialPort == 0xFF) selectedSerialPort = 0;
+  eeprom_update_byte((uint8_t *)EEPROM_SECOND_SERIAL_ACTIVE, selectedSerialPort);
+  MYSERIAL.begin(BAUDRATE);
+  fdev_setup_stream(uartout, uart_putchar, NULL, _FDEV_SETUP_WRITE); //setup uart out stream
+  stdout = uartout;
+#ifdef XFLASH
+  bool xflash_success = xflash_init();
+  uint8_t optiboot_status = 1;
+  if (xflash_success)
+  {
+    optiboot_status = optiboot_xflash_enter();
+#if (LANG_MODE != 0) //secondary language support
+    update_sec_lang_from_external_flash();
+#endif //(LANG_MODE != 0)
+  }
+  else
+  {
+    xflash_err_msg();
+  }
+#else
+  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。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。

knowledge/3d_print/2022102301.txt · 最后更改: 2023/06/14 12:34 由弘毅