From 8c78f265c6af0618d30c74066d57251b8b7f8478 Mon Sep 17 00:00:00 2001
From: kkira <kira.n.neit@gmail.com>
Date: Thu, 18 Jun 2026 00:00:40 +0300
Subject: [PATCH] =?UTF-8?q?=D0=94=D1=80=D0=B0=D0=B9=D0=B2=D0=B5=D1=80=20MH?=
 =?UTF-8?q?-Z19C=20=D1=81=20=D0=BA=D0=BE=D0=BC=D0=B0=D0=BD=D0=B4=D0=B0?=
 =?UTF-8?q?=D0=BC=D0=B8=20=D0=BF=D0=BE=D0=BA=D0=B0=D0=B7=D0=B0=D0=BD=D0=B8?=
 =?UTF-8?q?=D1=8F=20CO2?=
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---
 STM32_CO2_NODE/App/Models/co2_data.hpp   |  3 +
 STM32_CO2_NODE/Core/Src/freertos.c       |  3 +-
 STM32_CO2_NODE/Drivers/MHZ19C/mhz19c.cpp | 72 +++++++++++++++++++++++-
 STM32_CO2_NODE/Drivers/MHZ19C/mhz19c.hpp | 23 +++++++-
 4 files changed, 97 insertions(+), 4 deletions(-)
 create mode 100644 STM32_CO2_NODE/App/Models/co2_data.hpp

diff --git a/STM32_CO2_NODE/App/Models/co2_data.hpp b/STM32_CO2_NODE/App/Models/co2_data.hpp
new file mode 100644
index 0000000..0fb5c45
--- /dev/null
+++ b/STM32_CO2_NODE/App/Models/co2_data.hpp
@@ -0,0 +1,3 @@
+void test_cpp()
+{
+}
diff --git a/STM32_CO2_NODE/Core/Src/freertos.c b/STM32_CO2_NODE/Core/Src/freertos.c
index 8eb7ba5..9abe1d8 100644
--- a/STM32_CO2_NODE/Core/Src/freertos.c
+++ b/STM32_CO2_NODE/Core/Src/freertos.c
@@ -26,7 +26,8 @@
 /* Private includes ----------------------------------------------------------*/
 /* USER CODE BEGIN Includes */
 #include "queue.h"
-#include "co2_data.hpp"
+
+#include "../../App/Models/co2_data.hpp"
 
 /* USER CODE END Includes */
 
diff --git a/STM32_CO2_NODE/Drivers/MHZ19C/mhz19c.cpp b/STM32_CO2_NODE/Drivers/MHZ19C/mhz19c.cpp
index b3a5689..d5e913d 100644
--- a/STM32_CO2_NODE/Drivers/MHZ19C/mhz19c.cpp
+++ b/STM32_CO2_NODE/Drivers/MHZ19C/mhz19c.cpp
@@ -1,5 +1,75 @@
 #include "mhz19c.hpp"
 
-MHZ19C::MHZ19C()
+extern "C"
+{
+#include "cmsis_os.h"
+}
+
+MHZ19C::MHZ19C(UART_HandleTypeDef* huart)
+    : uart_(huart)
 {
 }
+
+
+bool MHZ19C::ReadCO2(uint16_t& ppm)
+{
+    const uint8_t cmd[9] =
+    {
+        0xFF,
+        0x01,
+        0x86,
+        0x00,
+        0x00,
+        0x00,
+        0x00,
+        0x00,
+        0x79     };
+
+    if (HAL_UART_Transmit(
+            uart_,
+            const_cast<uint8_t*>(cmd),
+            sizeof(cmd),
+            100) != HAL_OK)
+    {
+        return false;     }
+
+    if (HAL_UART_Receive_DMA(
+            uart_,
+            rxBuffer_,
+            9) != HAL_OK)
+    {
+        return false;     }
+
+    osDelay(50);
+
+    if (rxBuffer_[0] != 0xFF ||
+        rxBuffer_[1] != 0x86)
+    {
+        return false;     }
+
+    ppm =
+        (static_cast<uint16_t>(rxBuffer_[2]) << 8) |
+         static_cast<uint16_t>(rxBuffer_[3]);
+
+    return true; }
+
+
+bool MHZ19C::Calibrate()
+{
+    const uint8_t cmd[9] =
+    {
+        0xFF,
+        0x01,
+        0x87,
+        0x00,
+        0x00,
+        0x00,
+        0x00,
+        0x00,
+        0x78 };
+
+    return HAL_UART_Transmit(
+            uart_,
+            (uint8_t*)cmd,
+            sizeof(cmd),
+            100) == HAL_OK; }
diff --git a/STM32_CO2_NODE/Drivers/MHZ19C/mhz19c.hpp b/STM32_CO2_NODE/Drivers/MHZ19C/mhz19c.hpp
index 7545731..6ef8347 100644
--- a/STM32_CO2_NODE/Drivers/MHZ19C/mhz19c.hpp
+++ b/STM32_CO2_NODE/Drivers/MHZ19C/mhz19c.hpp
@@ -1,7 +1,26 @@
 #pragma once
 
+#include <cstdint>
+
+extern "C"
+{
+#include "usart.h"
+}
+
+
 class MHZ19C
 {
 public:
-    MHZ19C();
-};
+
+    explicit MHZ19C(UART_HandleTypeDef* huart);
+
+    bool ReadCO2(uint16_t& ppm);
+
+    bool Calibrate();
+
+private:
+
+    UART_HandleTypeDef* uart_;
+
+    uint8_t txBuffer_[9];
+    uint8_t rxBuffer_[9]; };