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> 针对近来我们论坛的lpc和传感器的DIY活动，由于手头没有lcd，昨天我干脆焊了一个8*32的LED,整整花了我一天的时间，打算用它来显示调试信息，并做显示用。到时候还可以在上面直接玩贪吃蛇，俄罗斯方块，迷宫，飞机等游戏。为了不扩展别的芯片，我打算直接用io来驱动，了解了下lpc1343，它一共才有42个gpio，以后还要接各种传感器，usb等，8*32点阵就要把它给用完了，所以就用3块好了，8*24用做显示也足够了，等以后有了lcd再做更精细的显示吧~~</P>
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> 废话少说先上代码~~
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>/*<BR>===============================================================================<BR> Name : main.c<BR> Author : lovedata<BR> Version :<BR> Copyright : (C) Copyright <BR> Description : main definition<BR>===============================================================================<BR>*/</P>
<P>#ifdef __USE_CMSIS<BR>#include "LPC13xx.h"<BR>#endif</P>
<P>// TODO: insert other include files here<BR>#include "clkconfig.h"<BR>#include "gpio.h"<BR>#include "led_matrix.h"<BR>// TODO: insert other definitions and declarations here<BR>volatile uint32_t msTicks; /* counts 1ms timeTicks */<BR>/*----------------------------------------------------------------------------<BR> SysTick_Handler<BR> *----------------------------------------------------------------------------*/<BR>void SysTick_Handler(void) {<BR> msTicks++; /* increment counter necessary in Delay() */<BR>}</P>
<P>/*------------------------------------------------------------------------------<BR> delays number of tick Systicks (happens every 1 ms)<BR> *------------------------------------------------------------------------------*/<BR>__INLINE static void Delay (uint32_t dlyTicks) {<BR> uint32_t curTicks;</P>
<P> curTicks = msTicks;<BR> while ((msTicks - curTicks) < dlyTicks);<BR>}</P>
<P>__INLINE void SysInit(void)<BR>{<BR> GPIOInit();<BR> /* Initialize port data so LED Matrix is OFF by default */<BR> LPC_GPIO3->DATA |= 0x0f; /* set P3_0~P3_3 output data to all 1's */<BR> LPC_GPIO1->DATA |= 0xf00; /* set P1_8~P1_11 output data to all 1's */<BR> LPC_GPIO2->DATA &= ~0x7f8; /* set P2_3~P2_10 output data to all 0's */<BR> LPC_GPIO3->DIR |= 0x00f; /* set P3_0~P3_3 to output */<BR> LPC_GPIO1->DIR |= 0xf00; /* set P1_8~P1_11 to output */<BR> LPC_GPIO2->DIR |= 0x7f8; /* set P2_3~P2_10 to output */<BR>}<BR>__INLINE void PrintMsg(uint32_t character)<BR>{<BR> uint32_t i;<BR> for(i = 0; i < 5; i ++)<BR> {<BR> LPC_GPIO3->DATA = ~(1<<i);<BR> LPC_GPIO1->DATA = ~( 1<< (i+4));<BR> LPC_GPIO2->DATA = (FontTable [character-32]
<<3);<BR> Delay(5);<BR> }<BR>}<BR>int main(void) {<BR> <BR> // TODO: insert code here<BR> SysInit();<BR> if (SysTick_Config(SystemCoreClock / 1000)) { /* Setup SysTick Timer for 1 msec interrupts */<BR> while (1); /* Capture error */<BR> }</P>
<P> if ( !(SysTick->CTRL & SysTick_CTRL_CLKSOURCE_Msk) )<BR> {<BR> /* When external reference clock is used(CLKSOURCE in<BR> Systick Control and register bit 2 is set to 0), the<BR> SYSTICKCLKDIV must be a non-zero value and 2.5 times<BR> faster than the reference clock.<BR> When core clock, or system AHB clock, is used(CLKSOURCE<BR> in Systick Control and register bit 2 is set to 1), the<BR> SYSTICKCLKDIV has no effect to the SYSTICK frequency. See<BR> more on Systick clock and status register in Cortex-M3<BR> technical Reference Manual. */<BR> LPC_SYSCON->SYSTICKCLKDIV = 0x08;<BR> }<BR> while(1)<BR> {<BR> PrintMsg('B');<BR> }<BR> return 0 ;<BR>}<BR> 上面这段代码使8*8led点阵显示了一个"B"，这个模块只用到了io的设置和系统的滴答定时器，感觉lpc1343的io驱动能力还是很强的，驱动8*8的点阵全亮都没问题，所以在驱动上就不用担心了，接下来我会把led显示驱动写完整，完了就可以进行DIY的第一个应用了，用加速度传感器在led上显示倾斜角度。。。。。。</P>