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Merge pull request #8 from davidlehrian/master

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Add example.
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Feelfree (Filip) 2021-10-13 09:49:33 +03:00 • committed by GitHub
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2 changed files with 78 additions and 0 deletions
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12
ds18b20.h
View file

@ -39,6 +39,12 @@ static const uint8_t dscrc2x16_table[] = {
0x8C, 0x11, 0xAF, 0x32, 0xCA, 0x57, 0xE9, 0x74
};
/* *INDENT-OFF* */
#ifdef __cplusplus
extern "C" {
#endif
/* *INDENT-ON* */
void ds18b20_init(int GPIO);
#define ds18b20_send ds18b20_write
@ -70,4 +76,10 @@ float ds18b20_get_temp(void);
void reset_search();
bool search(uint8_t *newAddr, bool search_mode);
/* *INDENT-OFF* */
#ifdef __cplusplus
}
#endif
/* *INDENT-ON* */
#endif

66
main.c Normal file
View file

@ -0,0 +1,66 @@
#include <stdio.h>
#include "ds18b20.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
// Temp Sensors are on GPIO26
#define TEMP_BUS 26
#define LED 2
#define HIGH 1
#define LOW 0
#define digitalWrite gpio_set_level
DeviceAddress tempSensors[2];
void getTempAddresses(DeviceAddress *tempSensorAddresses) {
unsigned int numberFound = 0;
reset_search();
// search for 2 addresses on the oneWire protocol
while (search(tempSensorAddresses[numberFound],true)) {
numberFound++;
if (numberFound == 2) break;
}
// if 2 addresses aren't found then flash the LED rapidly
while (numberFound != 2) {
numberFound = 0;
digitalWrite(LED, HIGH);
vTaskDelay(100 / portTICK_PERIOD_MS);
digitalWrite(LED, LOW);
vTaskDelay(100 / portTICK_PERIOD_MS);
// search in the loop for the temp sensors as they may hook them up
reset_search();
while (search(tempSensorAddresses[numberFound],true)) {
numberFound++;
if (numberFound == 2) break;
}
}
return;
}
void app_main(void){
gpio_reset_pin(LED);
/* Set the GPIO as a push/pull output */
gpio_set_direction(LED, GPIO_MODE_OUTPUT);
ds18b20_init(TEMP_BUS);
getTempAddresses(tempSensors);
ds18b20_setResolution(tempSensors,2,10);
printf("Address 0: 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x \n", tempSensors[0][0],tempSensors[0][1],tempSensors[0][2],tempSensors[0][3],tempSensors[0][4],tempSensors[0][5],tempSensors[0][6],tempSensors[0][7]);
printf("Address 1: 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x \n", tempSensors[1][0],tempSensors[1][1],tempSensors[1][2],tempSensors[1][3],tempSensors[1][4],tempSensors[1][5],tempSensors[1][6],tempSensors[1][7]);
while (1) {
ds18b20_requestTemperatures();
float temp1 = ds18b20_getTempF((DeviceAddress *)tempSensors[0]);
float temp2 = ds18b20_getTempF((DeviceAddress *)tempSensors[1]);
float temp3 = ds18b20_getTempC((DeviceAddress *)tempSensors[0]);
float temp4 = ds18b20_getTempC((DeviceAddress *)tempSensors[1]);
printf("Temperatures: %0.1fF %0.1fF\n", temp1,temp2);
printf("Temperatures: %0.1fC %0.1fC\n", temp3,temp4);
float cTemp = ds18b20_get_temp();
printf("Temperature: %0.1fC\n", cTemp);
vTaskDelay(1000 / portTICK_PERIOD_MS);
}
}