Basic I2C functionality

.vscode/settings.json

@@ -1,8 +1,8 @@
 {
     "C_Cpp.intelliSenseEngine": "disabled",
-        
     "clangd.path": "/usr/bin/clangd",
-    "clangd.arguments": ["-log=verbose", 
+    "clangd.arguments": [
+        "-log=verbose",
         "-pretty",
         "--background-index",
         "--query-driver=/usr/bin/arm-none-eabi-g++",
@@ -21,6 +21,5 @@
         "system_stm32f4xx.h": "c",
         "core_cm4.h": "c"
     },
-                cortex-debug
     "cortex-debug.stlinkPath.linux": "/home/moritz/bin/st/stm32cubeclt/STLink-gdb-server/bin/ST-LINK_gdbserver"
 }

CMakeLists.txt

@@ -11,7 +11,7 @@ cmake_minimum_required(VERSION 3.22)
 set(CMAKE_C_STANDARD 11)
 set(CMAKE_C_STANDARD_REQUIRED ON)
 set(CMAKE_C_EXTENSIONS ON)
-set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD 23)
 
 
 # Define the build type
@@ -23,7 +23,7 @@ endif()
 set(CMAKE_PROJECT_NAME weight_cell)
 
 # Color output
-set(CMAKE_CXX_FLAGSS "-fdiagnostics-color=always")
+set(CMAKE_CXX_FLAGSS "-fdiagnostics-color=always -funwind-tables")
 
 # Include toolchain file
 include("cmake/gcc-arm-none-eabi.cmake")
@@ -54,6 +54,7 @@ target_sources(${CMAKE_PROJECT_NAME} PRIVATE
     Core/Src/main.cpp
     Core/Src/nau7802.cpp
     Core/Src/usart.cpp
+    Core/Src/i2c.cpp
 )
 
 # Add include paths

Core/Inc/i2c.hpp

@@ -0,0 +1,32 @@
+#pragma once
+#include <vector>
+
+#include "stm32f401xe.h"
+#include "stm32f4xx_hal.h"
+#include "stm32f4xx_hal_i2c.h"
+#include "stm32f4xx_hal_uart.h"
+
+namespace driver::i2c {
+
+constexpr const uint32_t I2C_TIMEOUT_MS{200};
+
+class I2c {
+   public:
+    explicit I2c(I2C_TypeDef* i2c, const uint32_t clockSpeed, const uint32_t dutyCycle,
+                 const uint32_t ownAddress1, const uint32_t addressingMode,
+                 const uint32_t dualAddressMode, const uint32_t ownAddress2,
+                 const uint32_t generalCallMode, const uint32_t noStretchMode);
+    ~I2c() = default;
+
+    bool init();
+    void deinit();
+    HAL_StatusTypeDef write(const uint16_t slaveAddr, const uint16_t memAddr,
+                            std::vector<uint8_t>& data);
+    std::pair<HAL_StatusTypeDef, uint8_t> read(const uint16_t slaveAddr, const uint16_t memAddr);
+    uint32_t getLastError();
+
+   private:
+    I2C_HandleTypeDef mHandle;
+};
+
+}  // namespace driver::i2c

Core/Inc/stm32f4xx_hal_conf.h

@@ -25,7 +25,7 @@
 #define __STM32F4xx_HAL_CONF_H
 
 #ifdef __cplusplus
- extern "C" {
+extern "C" {
 #endif
 
 /* Exported types ------------------------------------------------------------*/
@@ -37,7 +37,7 @@
   */
 #define HAL_MODULE_ENABLED
 
-  /* #define HAL_CRYP_MODULE_ENABLED */
+/* #define HAL_CRYP_MODULE_ENABLED */
 /* #define HAL_ADC_MODULE_ENABLED */
 /* #define HAL_CAN_MODULE_ENABLED */
 /* #define HAL_CRC_MODULE_ENABLED */
@@ -53,7 +53,7 @@
 /* #define HAL_SRAM_MODULE_ENABLED */
 /* #define HAL_SDRAM_MODULE_ENABLED */
 /* #define HAL_HASH_MODULE_ENABLED */
-/* #define HAL_I2C_MODULE_ENABLED */
+#define HAL_I2C_MODULE_ENABLED
 /* #define HAL_I2S_MODULE_ENABLED */
 /* #define HAL_IWDG_MODULE_ENABLED */
 /* #define HAL_LTDC_MODULE_ENABLED */
@@ -95,12 +95,12 @@
   *        This value is used by the RCC HAL module to compute the system frequency
   *        (when HSE is used as system clock source, directly or through the PLL).
   */
-#if !defined  (HSE_VALUE)
+#if !defined(HSE_VALUE)
-  #define HSE_VALUE    8000000U /*!< Value of the External oscillator in Hz */
+#define HSE_VALUE 8000000U /*!< Value of the External oscillator in Hz */
 #endif                     /* HSE_VALUE */
 
-#if !defined  (HSE_STARTUP_TIMEOUT)
+#if !defined(HSE_STARTUP_TIMEOUT)
-  #define HSE_STARTUP_TIMEOUT    100U   /*!< Time out for HSE start up, in ms */
+#define HSE_STARTUP_TIMEOUT 100U /*!< Time out for HSE start up, in ms */
 #endif                           /* HSE_STARTUP_TIMEOUT */
 
 /**
@@ -108,27 +108,27 @@
   *        This value is used by the RCC HAL module to compute the system frequency
   *        (when HSI is used as system clock source, directly or through the PLL).
   */
-#if !defined  (HSI_VALUE)
+#if !defined(HSI_VALUE)
-  #define HSI_VALUE    ((uint32_t)16000000U) /*!< Value of the Internal oscillator in Hz*/
+#define HSI_VALUE ((uint32_t)16000000U) /*!< Value of the Internal oscillator in Hz*/
 #endif                                  /* HSI_VALUE */
 
 /**
   * @brief Internal Low Speed oscillator (LSI) value.
   */
-#if !defined  (LSI_VALUE)
+#if !defined(LSI_VALUE)
- #define LSI_VALUE  32000U       /*!< LSI Typical Value in Hz*/
+#define LSI_VALUE 32000U /*!< LSI Typical Value in Hz*/
 #endif /* LSI_VALUE */   /*!< Value of the Internal Low Speed oscillator in Hz
                                              The real value may vary depending on the variations
                                              in voltage and temperature.*/
 /**
   * @brief External Low Speed oscillator (LSE) value.
   */
-#if !defined  (LSE_VALUE)
+#if !defined(LSE_VALUE)
- #define LSE_VALUE  32768U    /*!< Value of the External Low Speed oscillator in Hz */
+#define LSE_VALUE 32768U /*!< Value of the External Low Speed oscillator in Hz */
 #endif                   /* LSE_VALUE */
 
-#if !defined  (LSE_STARTUP_TIMEOUT)
+#if !defined(LSE_STARTUP_TIMEOUT)
-  #define LSE_STARTUP_TIMEOUT    5000U   /*!< Time out for LSE start up, in ms */
+#define LSE_STARTUP_TIMEOUT 5000U /*!< Time out for LSE start up, in ms */
 #endif                            /* LSE_STARTUP_TIMEOUT */
 
 /**
@@ -136,8 +136,8 @@
   *        This value is used by the I2S HAL module to compute the I2S clock source
   *        frequency, this source is inserted directly through I2S_CKIN pad.
   */
-#if !defined  (EXTERNAL_CLOCK_VALUE)
+#if !defined(EXTERNAL_CLOCK_VALUE)
-  #define EXTERNAL_CLOCK_VALUE    12288000U /*!< Value of the External audio frequency in Hz*/
+#define EXTERNAL_CLOCK_VALUE 12288000U /*!< Value of the External audio frequency in Hz*/
 #endif                                 /* EXTERNAL_CLOCK_VALUE */
 
 /* Tip: To avoid modifying this file each time you need to use different HSE,
@@ -272,203 +272,203 @@
   */
 
 #ifdef HAL_RCC_MODULE_ENABLED
-  #include "stm32f4xx_hal_rcc.h"
+#include "stm32f4xx_hal_rcc.h"
 #endif /* HAL_RCC_MODULE_ENABLED */
 
 #ifdef HAL_GPIO_MODULE_ENABLED
-  #include "stm32f4xx_hal_gpio.h"
+#include "stm32f4xx_hal_gpio.h"
 #endif /* HAL_GPIO_MODULE_ENABLED */
 
 #ifdef HAL_EXTI_MODULE_ENABLED
-  #include "stm32f4xx_hal_exti.h"
+#include "stm32f4xx_hal_exti.h"
 #endif /* HAL_EXTI_MODULE_ENABLED */
 
 #ifdef HAL_DMA_MODULE_ENABLED
-  #include "stm32f4xx_hal_dma.h"
+#include "stm32f4xx_hal_dma.h"
 #endif /* HAL_DMA_MODULE_ENABLED */
 
 #ifdef HAL_CORTEX_MODULE_ENABLED
-  #include "stm32f4xx_hal_cortex.h"
+#include "stm32f4xx_hal_cortex.h"
 #endif /* HAL_CORTEX_MODULE_ENABLED */
 
 #ifdef HAL_ADC_MODULE_ENABLED
-  #include "stm32f4xx_hal_adc.h"
+#include "stm32f4xx_hal_adc.h"
 #endif /* HAL_ADC_MODULE_ENABLED */
 
 #ifdef HAL_CAN_MODULE_ENABLED
-  #include "stm32f4xx_hal_can.h"
+#include "stm32f4xx_hal_can.h"
 #endif /* HAL_CAN_MODULE_ENABLED */
 
 #ifdef HAL_CAN_LEGACY_MODULE_ENABLED
-  #include "stm32f4xx_hal_can_legacy.h"
+#include "stm32f4xx_hal_can_legacy.h"
 #endif /* HAL_CAN_LEGACY_MODULE_ENABLED */
 
 #ifdef HAL_CRC_MODULE_ENABLED
-  #include "stm32f4xx_hal_crc.h"
+#include "stm32f4xx_hal_crc.h"
 #endif /* HAL_CRC_MODULE_ENABLED */
 
 #ifdef HAL_CRYP_MODULE_ENABLED
-  #include "stm32f4xx_hal_cryp.h"
+#include "stm32f4xx_hal_cryp.h"
 #endif /* HAL_CRYP_MODULE_ENABLED */
 
 #ifdef HAL_DMA2D_MODULE_ENABLED
-  #include "stm32f4xx_hal_dma2d.h"
+#include "stm32f4xx_hal_dma2d.h"
 #endif /* HAL_DMA2D_MODULE_ENABLED */
 
 #ifdef HAL_DAC_MODULE_ENABLED
-  #include "stm32f4xx_hal_dac.h"
+#include "stm32f4xx_hal_dac.h"
 #endif /* HAL_DAC_MODULE_ENABLED */
 
 #ifdef HAL_DCMI_MODULE_ENABLED
-  #include "stm32f4xx_hal_dcmi.h"
+#include "stm32f4xx_hal_dcmi.h"
 #endif /* HAL_DCMI_MODULE_ENABLED */
 
 #ifdef HAL_ETH_MODULE_ENABLED
-  #include "stm32f4xx_hal_eth.h"
+#include "stm32f4xx_hal_eth.h"
 #endif /* HAL_ETH_MODULE_ENABLED */
 
 #ifdef HAL_ETH_LEGACY_MODULE_ENABLED
-  #include "stm32f4xx_hal_eth_legacy.h"
+#include "stm32f4xx_hal_eth_legacy.h"
 #endif /* HAL_ETH_LEGACY_MODULE_ENABLED */
 
 #ifdef HAL_FLASH_MODULE_ENABLED
-  #include "stm32f4xx_hal_flash.h"
+#include "stm32f4xx_hal_flash.h"
 #endif /* HAL_FLASH_MODULE_ENABLED */
 
 #ifdef HAL_SRAM_MODULE_ENABLED
-  #include "stm32f4xx_hal_sram.h"
+#include "stm32f4xx_hal_sram.h"
 #endif /* HAL_SRAM_MODULE_ENABLED */
 
 #ifdef HAL_NOR_MODULE_ENABLED
-  #include "stm32f4xx_hal_nor.h"
+#include "stm32f4xx_hal_nor.h"
 #endif /* HAL_NOR_MODULE_ENABLED */
 
 #ifdef HAL_NAND_MODULE_ENABLED
-  #include "stm32f4xx_hal_nand.h"
+#include "stm32f4xx_hal_nand.h"
 #endif /* HAL_NAND_MODULE_ENABLED */
 
 #ifdef HAL_PCCARD_MODULE_ENABLED
-  #include "stm32f4xx_hal_pccard.h"
+#include "stm32f4xx_hal_pccard.h"
 #endif /* HAL_PCCARD_MODULE_ENABLED */
 
 #ifdef HAL_SDRAM_MODULE_ENABLED
-  #include "stm32f4xx_hal_sdram.h"
+#include "stm32f4xx_hal_sdram.h"
 #endif /* HAL_SDRAM_MODULE_ENABLED */
 
 #ifdef HAL_HASH_MODULE_ENABLED
- #include "stm32f4xx_hal_hash.h"
+#include "stm32f4xx_hal_hash.h"
 #endif /* HAL_HASH_MODULE_ENABLED */
 
 #ifdef HAL_I2C_MODULE_ENABLED
- #include "stm32f4xx_hal_i2c.h"
+#include "stm32f4xx_hal_i2c.h"
 #endif /* HAL_I2C_MODULE_ENABLED */
 
 #ifdef HAL_SMBUS_MODULE_ENABLED
- #include "stm32f4xx_hal_smbus.h"
+#include "stm32f4xx_hal_smbus.h"
 #endif /* HAL_SMBUS_MODULE_ENABLED */
 
 #ifdef HAL_I2S_MODULE_ENABLED
- #include "stm32f4xx_hal_i2s.h"
+#include "stm32f4xx_hal_i2s.h"
 #endif /* HAL_I2S_MODULE_ENABLED */
 
 #ifdef HAL_IWDG_MODULE_ENABLED
- #include "stm32f4xx_hal_iwdg.h"
+#include "stm32f4xx_hal_iwdg.h"
 #endif /* HAL_IWDG_MODULE_ENABLED */
 
 #ifdef HAL_LTDC_MODULE_ENABLED
- #include "stm32f4xx_hal_ltdc.h"
+#include "stm32f4xx_hal_ltdc.h"
 #endif /* HAL_LTDC_MODULE_ENABLED */
 
 #ifdef HAL_PWR_MODULE_ENABLED
- #include "stm32f4xx_hal_pwr.h"
+#include "stm32f4xx_hal_pwr.h"
 #endif /* HAL_PWR_MODULE_ENABLED */
 
 #ifdef HAL_RNG_MODULE_ENABLED
- #include "stm32f4xx_hal_rng.h"
+#include "stm32f4xx_hal_rng.h"
 #endif /* HAL_RNG_MODULE_ENABLED */
 
 #ifdef HAL_RTC_MODULE_ENABLED
- #include "stm32f4xx_hal_rtc.h"
+#include "stm32f4xx_hal_rtc.h"
 #endif /* HAL_RTC_MODULE_ENABLED */
 
 #ifdef HAL_SAI_MODULE_ENABLED
- #include "stm32f4xx_hal_sai.h"
+#include "stm32f4xx_hal_sai.h"
 #endif /* HAL_SAI_MODULE_ENABLED */
 
 #ifdef HAL_SD_MODULE_ENABLED
- #include "stm32f4xx_hal_sd.h"
+#include "stm32f4xx_hal_sd.h"
 #endif /* HAL_SD_MODULE_ENABLED */
 
 #ifdef HAL_SPI_MODULE_ENABLED
- #include "stm32f4xx_hal_spi.h"
+#include "stm32f4xx_hal_spi.h"
 #endif /* HAL_SPI_MODULE_ENABLED */
 
 #ifdef HAL_TIM_MODULE_ENABLED
- #include "stm32f4xx_hal_tim.h"
+#include "stm32f4xx_hal_tim.h"
 #endif /* HAL_TIM_MODULE_ENABLED */
 
 #ifdef HAL_UART_MODULE_ENABLED
- #include "stm32f4xx_hal_uart.h"
+#include "stm32f4xx_hal_uart.h"
 #endif /* HAL_UART_MODULE_ENABLED */
 
 #ifdef HAL_USART_MODULE_ENABLED
- #include "stm32f4xx_hal_usart.h"
+#include "stm32f4xx_hal_usart.h"
 #endif /* HAL_USART_MODULE_ENABLED */
 
 #ifdef HAL_IRDA_MODULE_ENABLED
- #include "stm32f4xx_hal_irda.h"
+#include "stm32f4xx_hal_irda.h"
 #endif /* HAL_IRDA_MODULE_ENABLED */
 
 #ifdef HAL_SMARTCARD_MODULE_ENABLED
- #include "stm32f4xx_hal_smartcard.h"
+#include "stm32f4xx_hal_smartcard.h"
 #endif /* HAL_SMARTCARD_MODULE_ENABLED */
 
 #ifdef HAL_WWDG_MODULE_ENABLED
- #include "stm32f4xx_hal_wwdg.h"
+#include "stm32f4xx_hal_wwdg.h"
 #endif /* HAL_WWDG_MODULE_ENABLED */
 
 #ifdef HAL_PCD_MODULE_ENABLED
- #include "stm32f4xx_hal_pcd.h"
+#include "stm32f4xx_hal_pcd.h"
 #endif /* HAL_PCD_MODULE_ENABLED */
 
 #ifdef HAL_HCD_MODULE_ENABLED
- #include "stm32f4xx_hal_hcd.h"
+#include "stm32f4xx_hal_hcd.h"
 #endif /* HAL_HCD_MODULE_ENABLED */
 
 #ifdef HAL_DSI_MODULE_ENABLED
- #include "stm32f4xx_hal_dsi.h"
+#include "stm32f4xx_hal_dsi.h"
 #endif /* HAL_DSI_MODULE_ENABLED */
 
 #ifdef HAL_QSPI_MODULE_ENABLED
- #include "stm32f4xx_hal_qspi.h"
+#include "stm32f4xx_hal_qspi.h"
 #endif /* HAL_QSPI_MODULE_ENABLED */
 
 #ifdef HAL_CEC_MODULE_ENABLED
- #include "stm32f4xx_hal_cec.h"
+#include "stm32f4xx_hal_cec.h"
 #endif /* HAL_CEC_MODULE_ENABLED */
 
 #ifdef HAL_FMPI2C_MODULE_ENABLED
- #include "stm32f4xx_hal_fmpi2c.h"
+#include "stm32f4xx_hal_fmpi2c.h"
 #endif /* HAL_FMPI2C_MODULE_ENABLED */
 
 #ifdef HAL_FMPSMBUS_MODULE_ENABLED
- #include "stm32f4xx_hal_fmpsmbus.h"
+#include "stm32f4xx_hal_fmpsmbus.h"
 #endif /* HAL_FMPSMBUS_MODULE_ENABLED */
 
 #ifdef HAL_SPDIFRX_MODULE_ENABLED
- #include "stm32f4xx_hal_spdifrx.h"
+#include "stm32f4xx_hal_spdifrx.h"
 #endif /* HAL_SPDIFRX_MODULE_ENABLED */
 
 #ifdef HAL_DFSDM_MODULE_ENABLED
- #include "stm32f4xx_hal_dfsdm.h"
+#include "stm32f4xx_hal_dfsdm.h"
 #endif /* HAL_DFSDM_MODULE_ENABLED */
 
 #ifdef HAL_LPTIM_MODULE_ENABLED
- #include "stm32f4xx_hal_lptim.h"
+#include "stm32f4xx_hal_lptim.h"
 #endif /* HAL_LPTIM_MODULE_ENABLED */
 
 #ifdef HAL_MMC_MODULE_ENABLED
- #include "stm32f4xx_hal_mmc.h"
+#include "stm32f4xx_hal_mmc.h"
 #endif /* HAL_MMC_MODULE_ENABLED */
 
 /* Exported macro ------------------------------------------------------------*/
@@ -481,11 +481,11 @@
   *         If expr is true, it returns no value.
   * @retval None
   */
-  #define assert_param(expr) ((expr) ? (void)0U : assert_failed((uint8_t *)__FILE__, __LINE__))
+#define assert_param(expr) ((expr) ? (void)0U : assert_failed((uint8_t*)__FILE__, __LINE__))
 /* Exported functions ------------------------------------------------------- */
-  void assert_failed(uint8_t* file, uint32_t line);
+void assert_failed(uint8_t* file, uint32_t line);
 #else
-  #define assert_param(expr) ((void)0U)
+#define assert_param(expr) ((void)0U)
 #endif /* USE_FULL_ASSERT */
 
 #ifdef __cplusplus

Core/Inc/usart.hpp

@@ -1,7 +1,5 @@
 #pragma once
 
-#include <ranges>
-#include <sstream>
 #include <string_view>
 
 #include "stm32f401xe.h"
@@ -10,7 +8,6 @@
 
 namespace driver::usart {
 
-constexpr const uint8_t TX_BUFSIZE{20};
 constexpr const uint8_t TX_TIMEOUT_MS{200};
 
 class Usart {

Core/Src/i2c.cpp

@@ -0,0 +1,77 @@
+#include "i2c.hpp"
+
+#include "pindef.hpp"
+#include "stm32f4xx_hal_i2c.h"
+
+namespace driver::i2c {
+I2c::I2c(I2C_TypeDef* i2c, const uint32_t clockSpeed, const uint32_t dutyCycle,
+         const uint32_t ownAddress1, const uint32_t addressingMode, const uint32_t dualAddressMode,
+         const uint32_t ownAddress2, const uint32_t generalCallMode, const uint32_t noStretchMode)
+    : mHandle{.Instance = i2c,
+              .Init{.ClockSpeed      = clockSpeed,
+                    .DutyCycle       = dutyCycle,
+                    .OwnAddress1     = ownAddress1,
+                    .AddressingMode  = addressingMode,
+                    .DualAddressMode = dualAddressMode,
+                    .OwnAddress2     = ownAddress2,
+                    .GeneralCallMode = generalCallMode,
+                    .NoStretchMode   = noStretchMode},
+              .pBuffPtr      = nullptr,
+              .XferSize      = 0,
+              .XferCount     = 0,
+              .XferOptions   = 0,
+              .PreviousState = 0,
+              .hdmatx        = nullptr,
+              .hdmarx        = nullptr,
+              .Lock          = HAL_UNLOCKED,
+              .State         = HAL_I2C_STATE_RESET,
+              .Mode          = HAL_I2C_MODE_NONE,
+              .ErrorCode     = HAL_I2C_ERROR_NONE,
+              .Devaddress    = 0,
+              .Memaddress    = 0,
+              .MemaddSize    = 0,
+              .EventCount    = 0} {}
+
+bool I2c::init() {
+    GPIO_InitTypeDef GPIO_InitStruct = {0};
+    if (mHandle.Instance == I2C1) {
+        __HAL_RCC_GPIOB_CLK_ENABLE();
+        /**I2C1 GPIO Configuration
+        PB6     ------> I2C1_SCL
+        PB7     ------> I2C1_SDA
+        */
+        GPIO_InitStruct.Pin       = GPIO_PIN_6 | GPIO_PIN_7;
+        GPIO_InitStruct.Mode      = GPIO_MODE_AF_OD;
+        GPIO_InitStruct.Pull      = GPIO_PULLUP;
+        GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_VERY_HIGH;
+        GPIO_InitStruct.Alternate = GPIO_AF4_I2C1;
+        HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
+
+        __HAL_RCC_I2C1_CLK_ENABLE();
+    }
+    return HAL_I2C_Init(&mHandle) == HAL_OK;
+}
+
+void I2c::deinit() {}
+
+HAL_StatusTypeDef I2c::write(const uint16_t slaveAddr, const uint16_t memAddr,
+                             std::vector<uint8_t>& data) {
+    // Slave address needs to be shifted to the left, so that the r/w bit can be set by the HAL method
+    // Addressing mode for slaves is fixed to 8bit for now...
+    return HAL_I2C_Mem_Write(&mHandle, slaveAddr << 1, memAddr, I2C_MEMADD_SIZE_8BIT, data.data(),
+                             data.size(), I2C_TIMEOUT_MS);
+}
+
+std::pair<HAL_StatusTypeDef, uint8_t> I2c::read(const uint16_t slaveAddr, const uint16_t memAddr) {
+    uint8_t data;
+    // Slave address needs to be shifted to the left, so that the r/w bit can be set by the HAL method
+    auto state = HAL_I2C_Mem_Read(&mHandle, slaveAddr << 1, memAddr, I2C_MEMADD_SIZE_8BIT, &data, 1,
+                                  I2C_TIMEOUT_MS);
+    return {state, data};
+}
+
+uint32_t I2c::getLastError() {
+    return mHandle.ErrorCode;
+}
+
+}  // namespace driver::i2c

Core/Src/main.cpp

@@ -1,12 +1,22 @@
 #include "main.h"
 
-#include <cstdlib>
+#include <cstdint>
+#include <memory>
+#include <string>
 
 #include "gpio.h"
+#include "i2c.hpp"
+#include "stm32_hal_legacy.h"
 #include "stm32f4xx_hal.h"
+#include "stm32f4xx_hal_def.h"
+#include "stm32f4xx_hal_i2c.h"
 #include "usart.hpp"
 
+// needs to be global to be accessible in error handler
+std::unique_ptr<driver::usart::Usart> usart2{nullptr};
+
 void SystemClock_Config(void);
+void checkHalStatus(HAL_StatusTypeDef);
 
 int main(void) {
 
@@ -19,20 +29,85 @@ int main(void) {
     /* Initialize all configured peripherals */
     MX_GPIO_Init();
 
-    driver::usart::Usart usart2(USART2, 115200, UART_WORDLENGTH_8B, UART_STOPBITS_1,
+    usart2 = std::make_unique<driver::usart::Usart>(
-                                UART_PARITY_NONE, UART_MODE_TX_RX, UART_HWCONTROL_NONE,
+        driver::usart::Usart(USART2, 115200, UART_WORDLENGTH_8B, UART_STOPBITS_1, UART_PARITY_NONE,
-                                UART_OVERSAMPLING_16);
+                             UART_MODE_TX_RX, UART_HWCONTROL_NONE, UART_OVERSAMPLING_16));
 
-    usart2.init();
+    usart2->init();
-    usart2.println("");
+    usart2->println("");
-    usart2.println("\r\nWeight cell init.");
+    usart2->println("\r\nWeight cell init.");
 
-    int i{0};
+    auto i2c1 = std::make_unique<driver::i2c::I2c>(
+        I2C1, 100000, I2C_DUTYCYCLE_2, 0x00, I2C_ADDRESSINGMODE_7BIT, I2C_DUALADDRESS_DISABLED,
+        0x00, I2C_GENERALCALL_DISABLED, I2C_NOSTRETCH_DISABLED);
+
+    if (!i2c1->init()) {
+        usart2->println("Error intializing I2C1!");
+        usart2->println("Last Error: " + std::to_string(i2c1->getLastError()));
+        Error_Handler();
+    } else {
+        usart2->println("I2C1 intialized successful");
+    }
+    // init NAU7802
+    {
+        std::vector<uint8_t> data = {0x01};
+        //  reset NAU7802
+        checkHalStatus(i2c1->write(0x2A, 0x00, data));
+        usart2->println("Reset nau");
+        HAL_Delay(100);
+
+        // power up digital logic
+        data[0] = 0x02;
+        i2c1->write(0x2A, 0x00, data);
+        HAL_Delay(100);
+        usart2->println("PUP digi");
+
+        // power up analog logic
+        data[0] = 0x06;
+        i2c1->write(0x2A, 0x00, data);
+        HAL_Delay(100);
+
+        usart2->println("PUP analog");
+
+        // use internal LDO as reference
+        data[0] = 0x86;
+        checkHalStatus(i2c1->write(0x2A, 0x00, data));
+        HAL_Delay(100);
+
+        // print status back to usart
+        auto ret = i2c1->read(0x2A, 0x00);
+        checkHalStatus(ret.first);
+        usart2->println("NAU7802 reports state " + std::to_string(ret.second) + " at 0x00");
+
+        // REG_CHPS CLK_CHP off
+        data[0] = 0x30;
+        checkHalStatus(i2c1->write(0x2A, 0x15, data));
+        HAL_Delay(100);
+    }
+
+    uint32_t measurement = 0;
+    auto val             = i2c1->read(0x2A, 0x12);
+    measurement |= (val.second << 16);
+
+    val = i2c1->read(0x2A, 0x13);
+    measurement |= (val.second << 8);
+
+    val = i2c1->read(0x2A, 0x14);
+    measurement |= val.second << 16;
 
     while (1) {
-        std::string buf{"Iteration #"};
+        measurement = 0;
+        val         = i2c1->read(0x2A, 0x12);
+        measurement |= (val.second << 16);
+
+        val = i2c1->read(0x2A, 0x13);
+        measurement |= (val.second << 8);
+
+        val = i2c1->read(0x2A, 0x14);
+        measurement |= val.second << 16;
+
+        usart2->println("Measurement " + std::to_string(measurement) + " counts");
 
-        usart2.println(buf + std::to_string(i++));
         HAL_Delay(1000);
     }
 }
@@ -75,6 +150,17 @@ void SystemClock_Config(void) {
     }
 }
 
+void checkHalStatus(HAL_StatusTypeDef status) {
+    if (status == HAL_OK) {
+        return;
+    }
+    if (usart2 == nullptr) {
+        Error_Handler();
+        return;  // never reached
+    }
+    usart2->println("HAL Status not okay! Calling Error Handler");
+}
+
 /**
   * @brief  This function is executed in case of error occurrence.
   * @retval None
@@ -82,6 +168,10 @@ void SystemClock_Config(void) {
 void Error_Handler(void) {
     /* USER CODE BEGIN Error_Handler_Debug */
     /* User can add his own implementation to report the HAL error return state */
+    if (usart2 != nullptr) {
+        usart2->println("=== ERROR HANDLER ===");
+        usart2->println("entering infinite loop...");
+    }
     __disable_irq();
     while (1) {}
     /* USER CODE END Error_Handler_Debug */

Core/Src/usart.cpp

@@ -12,13 +12,29 @@ namespace driver::usart {
 Usart::Usart(USART_TypeDef* usart, uint32_t baudRate, uint32_t wordLength, uint32_t stopBits,
              uint32_t parity, uint32_t mode, uint32_t hwFlowCtl, uint32_t overSampling)
     : mHandle{.Instance = usart,
-              .Init{.BaudRate     = baudRate,
+              .Init{
+                  .BaudRate     = baudRate,
                   .WordLength   = wordLength,
                   .StopBits     = stopBits,
                   .Parity       = parity,
                   .Mode         = mode,
                   .HwFlowCtl    = hwFlowCtl,
-                    .OverSampling = overSampling}} {}
+                  .OverSampling = overSampling,
+              },
+              .pTxBuffPtr    = nullptr,
+              .TxXferSize    = 0,
+              .TxXferCount   = 0,
+              .pRxBuffPtr    = nullptr,
+              .RxXferSize    = 0,
+              .RxXferCount   = 0,
+              .ReceptionType = HAL_UART_RECEPTION_STANDARD,
+              .RxEventType   = HAL_UART_RXEVENT_TC,
+              .hdmatx        = nullptr,
+              .hdmarx        = nullptr,
+              .Lock          = HAL_UNLOCKED,
+              .gState        = HAL_UART_STATE_RESET,
+              .RxState       = HAL_UART_STATE_RESET,
+              .ErrorCode     = 0} {}
 
 bool Usart::init() {
     GPIO_InitTypeDef GPIO_InitStruct;
@@ -38,7 +54,7 @@ bool Usart::init() {
         HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
     }
 
-    return HAL_UART_Init(&mHandle) != HAL_OK;
+    return HAL_UART_Init(&mHandle) == HAL_OK;
 }
 
 void Usart::deinit() {
@@ -60,14 +76,9 @@ void Usart::println(const std::string_view str) {
 }
 
 void Usart::tx(const std::string_view range) {
-    for (uint32_t pt{0}; pt <= range.size(); pt += TX_BUFSIZE) {
+
-        uint8_t txLen{TX_BUFSIZE};
+    HAL_UART_Transmit(&mHandle, reinterpret_cast<const uint8_t*>(range.begin()), range.size(),
-        if (range.length() < TX_BUFSIZE) {
-            txLen = range.length();
-        }
-        HAL_UART_Transmit(&mHandle, reinterpret_cast<const uint8_t*>(range.begin() + pt), txLen,
                       TX_TIMEOUT_MS);
-    }
 };
 
 }  // namespace driver::usart

cmake/stm32cubemx/CMakeLists.txt

@@ -25,6 +25,7 @@ target_sources(stm32cubemx INTERFACE
     ../../Core/Src/stm32f4xx_it.c
     ../../Core/Src/stm32f4xx_hal_msp.c
     ../../Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_uart.c
+    ../../Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2c.c
     ../../Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rcc.c
     ../../Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rcc_ex.c
     ../../Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_flash.c