WWDG+LCD1602秒表实验；* WWDG + LCD1602 秒表实验 *两个按键中断方式控制，计时精确到10ms *key1--Start/Stop---PA8(板子上User键) key2---Clear---PC13(板子上Tamper键) *LCD1602接线：D0~D7--->PD[0..7] RS->PE0 RW->PE1 E->PE2(外部接上拉电阻到5V) *by 追梦 2011-4-8 *change by:追梦 2011-

自己参考别人的代码，用stm32通过spi来驱动74HC595，间接驱动LCD1602-Have made reference to someone else s code, stm32 spi driver 74HC595, indirect drive LCD1602

STM 32 .LCD1602显示两行字符串，有字符串输出函数。-STM 32. LCD1602 display two lines of the string, the string output functions.

STM32F10x驱动LCD1602 显示气缸伸缩 次数达到1000次暂停 stm32驱动电磁阀，并在lec1602显示电磁阀运动次数(STM32F10x drive LCD1602 shows 1000 times of cylinder expansion. STM32 drives the solenoid valve and displays the solenoid valve movement in lec1602.)