基于lpc2138的流水灯和bcd码按键切换的c语言编程
时间: 2024-02-20 13:57:21 浏览: 133
好的,这里给您提供一个基于LPC2138的流水灯和BCD码按键切换的C语言编程示例代码。注意,这仅仅是一个示例代码,具体实现方法可能因不同的硬件和需求而有所不同。
首先,我们需要定义一些宏定义和变量:
```c
#include <LPC213x.h>
#define LED_ON 0
#define LED_OFF 1
unsigned int led_pattern = 0x0001;
unsigned char led_bcd = 0x00;
unsigned int cnt = 0;
unsigned char switch_flag = 0;
```
然后,我们需要初始化LED灯的GPIO口和按键的GPIO口:
```c
void init_led(void)
{
IO0DIR |= 0x0000FFFF;
IO0SET = led_pattern;
}
void init_switch(void)
{
IO0DIR &= ~(1 << 16);
IO0DIR &= ~(1 << 17);
IO0DIR &= ~(1 << 18);
}
```
接着,我们需要定义一个流水灯的函数,用于实现LED灯的流水效果:
```c
void shift_led(void)
{
led_pattern <<= 1;
if (led_pattern == 0x0000) {
led_pattern = 0x0001;
}
IO0SET = led_pattern;
}
```
接下来,我们需要定义一个BCD码转换的函数,用于将计数值转换为BCD码:
```c
void dec_to_bcd(unsigned int dec_num)
{
unsigned char bcd_h = 0, bcd_l = 0;
bcd_h = dec_num / 10;
bcd_l = dec_num % 10;
led_bcd = (bcd_h << 4) | bcd_l;
}
```
然后,我们需要定义一个按键扫描的函数,用于检测按键的状态:
```c
void scan_switch(void)
{
unsigned int switch_val = 0;
switch_val |= ((IO0PIN >> 16) & 0x01) << 0;
switch_val |= ((IO0PIN >> 17) & 0x01) << 1;
switch_val |= ((IO0PIN >> 18) & 0x01) << 2;
if (switch_val != 0x07) {
switch_flag = 1;
}
else {
switch_flag = 0;
}
}
```
最后,在主函数中,我们可以实现流水灯和BCD码的循环计数,并且通过按键切换流水灯的方向:
```c
int main(void)
{
init_led();
init_switch();
while (1) {
scan_switch();
if (switch_flag) {
switch_flag = 0;
if ((IO0PIN >> 16) & 0x01) {
led_pattern = 0x0001;
}
else if ((IO0PIN >> 17) & 0x01) {
led_pattern = 0x00FF;
}
else if ((IO0PIN >> 18) & 0x01) {
led_pattern = 0xFFFF;
}
}
if (led_pattern == 0x0001) {
for (cnt = 0; cnt < 100; cnt++) {
dec_to_bcd(cnt);
IO0SET = (led_pattern << 16) | led_bcd;
delay(100000);
}
for (cnt = 99; cnt > 0; cnt--) {
dec_to_bcd(cnt);
IO0SET = (led_pattern << 16) | led_bcd;
delay(100000);
}
shift_led();
}
else {
for (cnt = 0; cnt < 100; cnt++) {
dec_to_bcd(cnt);
IO0SET = (led_pattern << 16) | led_bcd;
delay(100000);
}
for (cnt = 99; cnt > 0; cnt--) {
dec_to_bcd(cnt);
IO0SET = (led_pattern << 16) | led_bcd;
delay(100000);
}
led_pattern >>= 1;
if (led_pattern == 0x0000) {
led_pattern = 0x8000;
}
}
}
return 0;
}
```
以上就是一个基于LPC2138的流水灯和BCD码按键切换的C语言编程示例代码。希望对您有所帮助。
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