61 lines
1.2 KiB
C
61 lines
1.2 KiB
C
#include <LPC17xx.h>
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unsigned long pwm_value = 0;
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void PWM_Init(void){
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LPC_PINCON->PINSEL3 |= 0x02 << 8;
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LPC_SC->PCONP |= 1 << 6;
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LPC_PWM1->PR = 0;
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LPC_PWM1->CTCR = 0;
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LPC_PWM1->MR0 = 1000;
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LPC_PWM1->MR2 = 500;
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LPC_PWM1->LER = 0x05;
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LPC_PWM1->PCR = 1 << 10;
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LPC_PWM1->TCR = 0x09;
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NVIC_EnableIRQ(PWM1_IRQn);
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}
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void Keyboard_Init(void){
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LPC_PINCON->PINSEL0 &= ~0x0FFF;
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LPC_GPIO0->FIODIR &= ~0x0F;
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}
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void Delay(unsigned long count){
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for(unsigned long i = 0; i < count; i++);
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}
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unsigned char Read_Keyboard(void){
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for(unsigned char i = 0; i < 4; i++){
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if(!(LPC_GPIO0->FIOPIN & (1 << i))){
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Delay(500000);
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if(!(LPC_GPIO0->FIOPIN & (1 << i))){
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while(!(LPC_GPIO0->FIOPIN & (1 << i)));
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Delay(500000);
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return i;
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}
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}
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}
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return 0xFF;
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}
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int main(void){
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unsigned char key;
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const unsigned long pwm_values[] = {100, 250, 500, 750};
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PWM_Init();
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Keyboard_Init();
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while(1){
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key = Read_Keyboard();
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if(key < 4){
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LPC_PWM1->MR2 = pwm_values[key];
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LPC_PWM1->LER |= 0x04;
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}
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}
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return 0;
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}
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void PWM1_IRQHandler(void){
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LPC_PWM1->IR |= 0x01;
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}
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