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a problem where the first byte of a serial port was lost.
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Signed-off-by: chenyong <[email protected]>
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startup.c
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解决get_week的有效值与IS_RTC_WEEKDAY判断有效值不一致的问题。
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get_week获取的值是0-6.而stm32f4xx_rtc.h中IS_RTC_WEEKDAY中判断的有效值是1-7.当设置日期是周日时，会有问题。
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configuration.
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1. Change the type of cmd to 'int';
2. Remove RT_LWIP_USING_RT_MEM macro;
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STM32F4系列UART在初始化的时候，如果GPIO_AF放到GPIO_INIT后边，系统复位后，串口会向外发送一个字节的数据，通常是0x00。将GPIO_AF放到GPIO_INIT前边可以避开这个问题。
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on ROM when used for IAR linker.
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filled the FIFO.
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Update board.h
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Export the end address of ram, to avoid hard-code heap size in application
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Use *.icf ram symbal, to avoid hardcode.
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[BSP] Update and rename readme.txt to readme.md in stm32f4
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