程序介绍：使用同一个IO口进行设置，高字节为按键，低字节为灯，流程中嵌入关系式变化：
FCV_COUNT = FCV_COUNT>>4;
FCV_COUNT = FCV_COUNT & 0x0f;
//** Date: Wednesday, November 21, 2012 20:50:00
//本程序版权所有: 51hei.com
#define MX_PIC
//Defines for microcontroller
#define P16F690
#define MX_EE
#define MX_EE_SIZE 256
#define MX_SPI
#define MX_SPI_BCB
#define MX_SPI_SDI 4
#define MX_SPI_SDO 7
#define MX_SPI_SCK 6
#define MX_UART
#define MX_UART_B
#define MX_UART_TX 7
#define MX_UART_RX 5
#define MX_I2C
#define MX_MI2C
#define MX_I2C_B
#define MX_I2C_SDA 4
#define MX_I2C_SCL 6
#define MX_PWM
#define MX_PWM_CNT 1
#define MX_PWM_TRIS1 trisc
#define MX_PWM_1 5
#define MX_CLK_SPEED 19660800
#ifdef _BOOSTC
#include <system.h>
#endif
#ifdef HI_TECH_C
#include <pic.h>
#endif
#include "F:\Program Files\Matrix Multimedia\Flowcode V4\FCD\internals.h"
//Variable declarations
char FCV_COUNT;
{
//Initialisation
ansel = 0;
anselh = 0;
//Interrupt initialisation code
option_reg = 0xC0;
//Loop
//Loop: While 1
while (1)
{
//Input
//Input: PORT C -> count
trisc = trisc | 0xff;
FCV_COUNT = portc;
//Calculation
//Calculation:
// count = count>>4
// count = count AND 0x0f
FCV_COUNT = FCV_COUNT>>4;
FCV_COUNT = FCV_COUNT & 0x0f;
//Output: count -> PORT C
trisc = 0x00;
portc = FCV_COUNT;
}
mainendloop: goto mainendloop;
}
{
}