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temp.c
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temp.c
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#include <stdio.h>
#include <stdbool.h>
#include <stddef.h>
#include <math.h>
#include "pico/stdlib.h"
#include "hardware/gpio.h"
#include "hardware/i2c.h"
#include "hardware/adc.h"
#include "ssd1306.h"
#define BEEP_PIN 27
#define TEMP_PIN 26
#define TEMP_ADC 0
#define INC_PIN 0
#define DEC_PIN 1
bool reserved_addr(uint8_t addr) {
return (addr & 0x78) == 0 || (addr & 0x78) == 0x78;
}
ssd1306_t disp;
void init() {
stdio_init_all();
gpio_init(BEEP_PIN);
gpio_set_dir(BEEP_PIN, GPIO_OUT);
adc_init();
adc_gpio_init(TEMP_PIN);
adc_select_input(TEMP_ADC);
gpio_init(INC_PIN);
gpio_set_dir(INC_PIN, GPIO_IN);
gpio_pull_up(INC_PIN);
gpio_init(DEC_PIN);
gpio_set_dir(DEC_PIN, GPIO_IN);
gpio_pull_up(DEC_PIN);
i2c_init(i2c1, 400000);
gpio_set_function(2, GPIO_FUNC_I2C);
gpio_set_function(3, GPIO_FUNC_I2C);
gpio_pull_up(2);
gpio_pull_up(3);
disp.external_vcc=false;
ssd1306_init(&disp, 128, 64, 0x3C, i2c1);
ssd1306_clear(&disp);
}
void beep_set(bool enabled) {
gpio_put(BEEP_PIN, enabled);
}
bool inc_get(){
return !gpio_get(INC_PIN);
}
bool dec_get(){
return !gpio_get(DEC_PIN);
}
double set_temp = 60;
#define SCREEN_HEIGHT 64
#define SCREEN_WIDTH 128
#define FONT_HEIGHT 8
#define FONT_WIDTH 5
#define SCREEN_CHAR_HEIGHT (SCREEN_HEIGHT/FONT_HEIGHT)
#define SCREEN_CHAR_WIDTH (SCREEN_WIDTH/FONT_WIDTH)
#define OLED_BUFFER_SIZE (SCREEN_CHAR_HEIGHT * SCREEN_CHAR_WIDTH)
char oled_buffer[OLED_BUFFER_SIZE];
#define oled_ui(...) {snprintf(oled_buffer, OLED_BUFFER_SIZE, __VA_ARGS__);flush_oled_buffer();}
void flush_oled_buffer() {
ssd1306_clear(&disp);
unsigned char y = 0;
unsigned char x = 0;
for (size_t i = 0; oled_buffer[i]; i++) {
if (oled_buffer[i] == '\r')
continue;
if (oled_buffer[i] == '\t')
continue; // TODO
if (oled_buffer[i] == '\n') {
y++;
x = 0;
continue;
}
if (x > (SCREEN_WIDTH-FONT_WIDTH)) {
y++;
x = 0;
}
if (y >= SCREEN_CHAR_HEIGHT)
break;
ssd1306_draw_char(&disp, x, y*FONT_HEIGHT, 1, oled_buffer[i]);
x += FONT_WIDTH;
}
for (;;) {
if (x > (SCREEN_WIDTH-FONT_WIDTH)) {
y++;
x = 0;
}
if (y >= SCREEN_CHAR_HEIGHT)
break;
ssd1306_draw_char(&disp, x, y*FONT_HEIGHT, 1, ' ');
x += FONT_WIDTH;
}
ssd1306_show(&disp);
}
double adc_u16_to_voltage(uint16_t result){
// 12-bit conversion, assume max value == ADC_VREF == 3.3 V
const double conversion_factor = 3.3f / (1 << 12);
return result * conversion_factor;
}
double adc_d_to_voltage(double result){
// 12-bit conversion, assume max value == ADC_VREF == 3.3 V
const double conversion_factor = 3.3f / (1 << 12);
return result * conversion_factor;
}
#define ADC_BUFFER_SIZE 64
uint16_t adc_buffer[ADC_BUFFER_SIZE];
size_t adc_buffer_pointer;
void adc_tick() {
if(adc_buffer_pointer>=ADC_BUFFER_SIZE) adc_buffer_pointer=0;
adc_buffer[adc_buffer_pointer] = adc_read();
adc_buffer_pointer++;
}
double adc_get_d() {
uint64_t sum=0;
for(size_t i=0;i<ADC_BUFFER_SIZE;i++) {
sum+=adc_buffer[i];
}
return ((double)sum)/((double)ADC_BUFFER_SIZE);
}
// https://blog.csdn.net/u013866683/article/details/79391849
//温度系数
#define B 3950.0
//额定温度(绝对温度加常温:273.15+25)
#define TN 298.15
// 额定阻值(绝对温度时的电阻值10k)
#define RN 10
#define BaseVol 3.3
double temp_read() {
double RV = adc_d_to_voltage(adc_get_d());
double RT=RV*10/(BaseVol-RV);//求出当前温度阻值 (BaseVoltage-RV)/R16=RV/RT;
double Tmp=1/(1/TN+(log(RT/RN)/B))-273.15;//%RT = RN exp*B(1/T-1/TN)%
return Tmp;
}
double temp;
// 0.01s
#define CYCLE 10
int main() {
init();
uint64_t count=0;
for(;;) {
sleep_ms(CYCLE);
count++;
adc_tick();
// every 0.3s
if(count%(300/CYCLE)==0){
temp = temp_read();
beep_set(temp>set_temp);
}
// every 0.2s
if(count%(200/CYCLE)==0){
if(inc_get()){
set_temp+=0.1;
}
if(dec_get()){
set_temp-=0.1;
}
}
// every 0.05s
if(count%(50/CYCLE)==0){
oled_ui("Welcome to the Temperature Measurement Device.\n"
"Temperature =\n%lf\n"
"Warning Temperature =\n%lf\n",
temp,set_temp);
}
}
return 0;
}