a2b9d688ea
Use onewire_addr_t for onewire addresses Move internal defines out of onewire.h Remove global variables for search state use taskENTER_CRITICAL instead of portDISABLE_INTERRUPTS remove unnecessary onewire_init function Remove unnecessary critical sections Use GPIO_OUT_OPEN_DRAIN reformat/style cleanup
55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
/* ds18b20 - Retrieves temperature from ds18b20 sensors and print it out.
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*
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* This sample code is in the public domain.,
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*/
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#include "espressif/esp_common.h"
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#include "esp/uart.h"
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#include "FreeRTOS.h"
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#include "task.h"
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#include "timers.h"
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#include "queue.h"
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// DS18B20 driver
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#include "ds18b20/ds18b20.h"
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void print_temperature(void *pvParameters)
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{
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int delay = 500;
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uint8_t amount = 0;
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// Declare amount of sensors
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uint8_t sensors = 2;
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ds_sensor_t t[sensors];
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// Use GPIO 13 as one wire pin.
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uint8_t GPIO_FOR_ONE_WIRE = 13;
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while(1) {
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// Search all DS18B20, return its amount and feed 't' structure with result data.
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amount = ds18b20_read_all(GPIO_FOR_ONE_WIRE, t);
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if (amount < sensors){
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printf("Something is wrong, I expect to see %d sensors \nbut just %d was detected!\n", sensors, amount);
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}
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for (int i = 0; i < amount; ++i)
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{
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int intpart = (int)t[i].value;
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int fraction = (int)((t[i].value - intpart) * 100);
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// Multiple "" here is just to satisfy compiler and don`t raise 'hex escape sequence out of range' warning.
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printf("Sensor %d report: %d.%02d ""\xC2""\xB0""C\n",t[i].id, intpart, fraction);
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}
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printf("\n");
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vTaskDelay(delay / portTICK_RATE_MS);
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}
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}
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void user_init(void)
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{
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uart_set_baud(0, 115200);
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printf("SDK version:%s\n", sdk_system_get_sdk_version());
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xTaskCreate(&print_temperature, (signed char *)"print_temperature", 256, NULL, 2, NULL);
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}
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