上次跑EEPROM，提示没有定义EEPROM，并提示通过熔丝位写，
由于本人，就这么一个D21开发板，所以采取，无过便是功的方法，就是先搞清楚究竟是怎么回事，再采取行动，
现在条件成熟了。
https://bbs.21ic.com/forum.php?mod=viewthread&tid=874803&extra=page%3D1%26filter%3Dtypeid%26typeid%3D380%26typeid%3D380
那就再跑一下EEPROM
首先新建ASF工程，然后加入EEPROM模块，再后打开ASF EXPLOERE，点开快速指导，按提示形成文件。
然后把熔丝位改为0x04
然后重新编译工程
下载运行
则灯亮，若下电再上电灯又亮，再重复又灭。
程序清单：
- /**
- * \file
- *
- * \brief Empty user application template
- *
- */
- /**
- * \mainpage User Application template doxygen documentation
- *
- * \par Empty user application template
- *
- * This is a bare minimum user application template.
- *
- * For documentation of the board, go \ref group_common_boards "here" for a link
- * to the board-specific documentation.
- *
- * \par Content
- *
- * -# Include the ASF header files (through asf.h)
- * -# Minimal main function that starts with a call to system_init()
- * -# Basic usage of on-board LED and button
- * -# "Insert application code here" comment
- *
- */
- /*
- * Include header files for all drivers that have been imported from
- * Atmel Software Framework (ASF).
- */
- /**
- * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
- */
-
- void configure_eeprom(void);
- #include <asf.h>
- void configure_eeprom(void)
- { /* Setup EEPROM emulator service */
- enum status_code error_code = eeprom_emulator_init();
- if (error_code == STATUS_ERR_NO_MEMORY)
- {
- while (true) { /* No EEPROM section has been set in the device's fuses */ } }
- else if (error_code != STATUS_OK) { /* Erase the emulated EEPROM memory (assume it is unformatted or * irrecoverably corrupt) */
- eeprom_emulator_erase_memory();
- eeprom_emulator_init(); }}
- int main (void)
- {
- system_init();
- configure_eeprom();
-
-
- uint8_t page_data[EEPROM_PAGE_SIZE];
- eeprom_emulator_read_page(0, page_data);
- page_data[0] = !page_data[0];
- port_pin_set_output_level(LED_0_PIN, page_data[0]);
- eeprom_emulator_write_page(0, page_data);
- eeprom_emulator_commit_page_buffer();
- while (true) { }
- }
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