main.c
[syntax=c]#include <stm32f10x_tim.h>
#include <misc.h>
#include <stdio.h>
#include "ir.h"
#define DELAY 10
void LED_Init() {
/* Enable GPIO clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
// Use PC8 and PC9 // Discovery LEDs
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}
void IR_Init() {
/* Enable GPIO clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
// Use PC6 as input from IR receiver
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// Enable clock and its interrupts
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource6);
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
EXTI_InitTypeDef EXTI_InitStructure;
EXTI_InitStructure.EXTI_Line = EXTI_Line6;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
}
void TIM_Init() {
// Enable clock and its interrupts
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_TimeBaseInitTypeDef TIM_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
TIM_InitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_InitStructure.TIM_Prescaler = 24 - 1;
TIM_InitStructure.TIM_Period = 10000 - 1; // Update event every 10000 us / 10 ms
TIM_InitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_InitStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM2, &TIM_InitStructure);
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
TIM_Cmd(TIM2, ENABLE);
}
int main(void)
{
LED_Init();
IR_Init();
TIM_Init();
ir_nec_init(GPIO_Pin_6, GPIOB);
while(1)
{
}
}
void TIM2_IRQHandler()
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
// Timeout
ir_nec_reset_transmission();
}
}
void EXTI9_5_IRQHandler(void)
{
static unsigned int counter;
if (EXTI_GetITStatus(EXTI_Line6) != RESET)
{
u8 bit = GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_6);
if (bit) {
GPIO_ResetBits(GPIOC, GPIO_Pin_9);
} else {
GPIO_SetBits(GPIOC, GPIO_Pin_9);
}
// Restart Timer
counter = TIM_GetCounter(TIM2);
TIM_SetCounter(TIM2, 0);
ir_nec_state_machine(counter);
EXTI_ClearITPendingBit(EXTI_Line6);
}
}[/syntax]
ir.c
[syntax=c]#include "ir.h"
u16 pin;
GPIO_TypeDef *gpio;
ir_nec_state ir_nec_current_state;
u8 cnt = 0;
unsigned int data, prev_data;
u16 ir_nec_pulse_lengths[6];
bool ir_nec_repeat_last_command = false;
void ir_nec_init(u16 p, GPIO_TypeDef *g) {
pin = p;
gpio = g;
ir_nec_current_state = IR_NEC_NONE;
ir_nec_pulse_lengths[IR_NEC_NONE] = 0;
ir_nec_pulse_lengths[IR_NEC_FIRST_BURST] = 9000;
ir_nec_pulse_lengths[IR_NEC_SECOND_BURST] = 4500;
ir_nec_pulse_lengths[IR_NEC_1] = 560;
ir_nec_pulse_lengths[IR_NEC_NDEF] = 1;
ir_nec_pulse_lengths[IR_NEC_SECOND_BURST_REPEAT] = 2250;
}
void ir_print_data(unsigned int p_data) {
static u8 dev_id;
//static u8 dev_id2;
static u8 cmd_id;
static u8 cmd_id2;
dev_id = (p_data & 0xFF000000) >> 24;
//dev_id2 = (p_data & 0x00FF0000) >> 16;
cmd_id = (p_data & 0x0000FF00) >> 8;
cmd_id2 = (p_data & 0x000000FF);
if (cmd_id + cmd_id2 == 0xFF) {
}
}
void ir_nec_reset_transmission() {
if (ir_nec_current_state != IR_NEC_NONE) {
ir_nec_current_state = IR_NEC_NONE;
if (ir_nec_repeat_last_command) {
ir_print_data(prev_data);
} else {
ir_print_data(data);
prev_data = data;
}
data = 0;
cnt = 0;
ir_nec_repeat_last_command = false;
}
}
bool ir_nec_check_tolerance(unsigned int received, ir_nec_state current_state) {
unsigned int expected = ir_nec_pulse_lengths[current_state];
if (current_state == IR_NEC_NONE ||
current_state == IR_NEC_NDEF) {
return true;
} else if (current_state == IR_NEC_SECOND_BURST) {
// We can receive long (4.5 ms) or short (2.25 ms) burst.
if (received < 3000) {
ir_nec_current_state = IR_NEC_SECOND_BURST_REPEAT;
// ^ nasty hack, but we are can determine type of burst after receiving
expected = ir_nec_pulse_lengths[IR_NEC_SECOND_BURST_REPEAT];
} else {
expected = ir_nec_pulse_lengths[IR_NEC_SECOND_BURST];
}
}
u32 min = expected - (TOLERANCE / 100.0) * expected;
u32 max = expected + (TOLERANCE / 100.0) * expected;
if ((received >= min) && (received <= max)) {
return true;
}
return false;
}
void ir_nec_state_machine(unsigned int time) {
//BitAction bit = 1 - GPIO_ReadInputDataBit(gpio, pin); // Invert received value
//GPIO_WriteBit(GPIOC, GPIO_Pin_8, bit);
if (!ir_nec_check_tolerance(time, ir_nec_current_state)) {
ir_nec_reset_transmission();
return;
}
switch (ir_nec_current_state) {
case IR_NEC_NONE:
ir_nec_current_state = IR_NEC_FIRST_BURST;
break;
case IR_NEC_FIRST_BURST:
ir_nec_current_state = IR_NEC_SECOND_BURST;
break;
case IR_NEC_SECOND_BURST:
ir_nec_current_state = IR_NEC_1;
break;
case IR_NEC_1:
ir_nec_current_state = IR_NEC_NDEF; // we can receive either 0 or 1
break;
case IR_NEC_NDEF:
ir_nec_current_state = IR_NEC_1;
if (time < 1000) {
data = data << 1 | 1;
} else {
data = data << 1 | 0;
}
//if (cnt++ == 32) { //all data received
//
//}
break;
case IR_NEC_SECOND_BURST_REPEAT:
// repeat last message
//ir_nec_repeat_last_command = true;
ir_nec_current_state = IR_NEC_1;
break;
default:
ir_nec_reset_transmission();
break;
}
}[/syntax]
ir.h
[syntax=c]#ifndef __IR_H__
#define __IR_H__
#include <stm32f10x.h>
#include <stm32f10x_gpio.h>
#include <stdbool.h>
#include <stdio.h>
#define TOLERANCE 20
typedef enum {
IR_NEC_NONE = 0,
IR_NEC_NDEF,
IR_NEC_FIRST_BURST,
IR_NEC_SECOND_BURST,
IR_NEC_SECOND_BURST_REPEAT,
IR_NEC_1
} ir_nec_state;
void ir_nec_init(u16 pin, GPIO_TypeDef *gpio);
void ir_nec_state_machine(unsigned int time);
void ir_nec_reset_transmission();
#endif // __IR_H__[/syntax]
pilot
Statystyki: Napisane przez NeverGiveUp — 7 paź 2018, o 13:41
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