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PWM Disp

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This commit is contained in:
sherlock 2025-10-23 13:00:53 +05:30
parent 0fc16cc75f
commit 5ba5925433
1 changed files with 16 additions and 29 deletions
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45
ES/Lab/Lab11/PWM_Keyboard.c
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@ -1,10 +1,7 @@
#include "LPC17xx.h"
volatile unsigned long int duty_cycle = 10;
volatile unsigned long int pwm_counter = 0;
#define LED_SHIFT 4
#define LED_MASK (0xFF << LED_SHIFT)
volatile unsigned long int duty_cycle = 300;
unsigned int last_key = 0xFF;
#define COL0 (1<<0)
#define COL1 (1<<1)
@ -15,8 +12,6 @@ volatile unsigned long int pwm_counter = 0;
#define COL_MASK_P0 (COL2 | COL3)
#define COL_MASK_P2 (COL0 | COL1)
#define PWM_PERIOD 100
static void delay_ms(unsigned int ms) {
unsigned int i, j;
for(i = 0; i < ms; i++)
@ -45,15 +40,8 @@ void PWM1_IRQHandler(void)
{
if (LPC_PWM1->IR & (1 << 0))
{
if(pwm_counter < duty_cycle)
LPC_GPIO0->FIOSET = LED_MASK;
else
LPC_GPIO0->FIOCLR = LED_MASK;
pwm_counter++;
if(pwm_counter >= PWM_PERIOD)
pwm_counter = 0;
LPC_PWM1->MR4 = duty_cycle;
LPC_PWM1->LER = (1 << 4);
LPC_PWM1->IR = (1 << 0);
}
}
@ -62,33 +50,32 @@ int main(void)
{
unsigned int col_idx;
unsigned int read_key;
unsigned int last_key = 0xFF;
LPC_PINCON->PINSEL0 &= ~(0xFFFF << 8);
LPC_PINCON->PINSEL1 &= ~(0xFFFF << 14);
LPC_PINCON->PINSEL4 &= ~(0xF << 0);
LPC_PINCON->PINSEL3 |= (2 << 14);
LPC_GPIO0->FIODIR |= LED_MASK;
LPC_GPIO0->FIODIR |= COL_MASK_P0;
LPC_GPIO2->FIODIR |= COL_MASK_P2;
LPC_GPIO0->FIODIR &= ~ROW0;
LPC_GPIO0->FIOCLR = LED_MASK;
LPC_GPIO2->FIOSET = COL_MASK_P2;
LPC_GPIO0->FIOSET = COL_MASK_P0;
LPC_SC->PCONP |= (1 << 6);
LPC_PWM1->TCR = (1 << 1);
LPC_PWM1->CTCR = 0;
LPC_PWM1->PR = 9;
LPC_PWM1->PR = 0;
LPC_PWM1->MR0 = 3000;
LPC_PWM1->MR4 = duty_cycle;
LPC_PWM1->MR0 = 100;
LPC_PWM1->MCR = (1 << 1) | (1 << 0);
LPC_PWM1->LER = (1 << 0);
LPC_PWM1->PCR = (1 << 12);
LPC_PWM1->LER = (1 << 0) | (1 << 4);
NVIC_EnableIRQ(PWM1_IRQn);
NVIC_SetPriority(PWM1_IRQn, 0);
LPC_PWM1->TCR = (1 << 0) | (1 << 3);
@ -118,10 +105,10 @@ int main(void)
last_key = read_key;
switch(read_key) {
case 0: duty_cycle = 10; break;
case 1: duty_cycle = 25; break;
case 2: duty_cycle = 50; break;
case 3: duty_cycle = 75; break;
case 0: duty_cycle = 300; break;
case 1: duty_cycle = 750; break;
case 2: duty_cycle = 1500; break;
case 3: duty_cycle = 2250; break;
}
}