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|  How to Fix Error: 'SPI_I2S_SendData' was not declared in this scope

How to Fix Error: 'SPI_I2S_SendData' was not declared in this scope

October 14, 2024

A concise C++ guide for firmware developers to resolve the 'SPI_I2S_SendData' undeclared error, with clear steps and solutions to fix scoping issues.

How to Fix Error: 'SPI_I2S_SendData' was not declared in this scope

 

Identify the Error Context

  • Check the specific line of code where 'SPI_I2S_SendData' is used. Verify that you are calling this function with the correct syntax.
  • Ensure that the function call matches the API provided by the STM32 or other microcontroller libraries you are using. Verify the version of your library.

 

Verify Header Files

  • Make sure that you have included the correct header files where 'SPI_I2S_SendData' is declared. Typically, this would be stm32f4xx\_spi.h or another STM32-specific header file.
  • Inspect your includes to see if there’s another SPI or I2S specific file you might have missed. Check both your local project and library includes.
  • Use direct includes rather than relying solely on IDE auto-import. Including relevant headers manually clarifies dependencies.

 

Library Compatibility Check

  • If you are using the STM32 HAL library, verify whether 'SPI_I2S_SendData' is available. Some newer versions might use different function names or have deprecated older ones.
  • Refer to your specific microcontroller's reference manual or relevant HAL documentation. It should provide a list of available functions and their correct usage.
  • If 'SPI_I2S_SendData' is deprecated, find alternative functions or methods recommended in the newer library versions.

 

Look for Typographical Errors

  • Check for any typographical errors in the function call. Even a small typo can cause a 'not declared' error.
  • Consider using search functionality (Ctrl + F) in your IDE for 'SPI_I2S_SendData' to ensure you have the correct function name in all references.

 

Compile with Verbose Logging

  • Modify your compiler settings to enable warnings or verbose output. Doing so can offer more context about what’s causing the error.
  • Use commands or flags that increase logging detail, helping pinpoint missing declarations and mismatches effectively.

 

Alternative Solutions and Workarounds

  • If the function is unavailable, manually define your own function for sending data, leveraging equivalent HAL or low-level operations needed to control SPI/I2S.
  • Develop a wrapper function that integrates with existing SPI functions, providing the required functionality that 'SPI_I2S_SendData' was supposed to offer.
  • Example custom send function:
void Custom_SPI_SendData(SPI_HandleTypeDef* hspi, uint16_t data) {
    // Wait until the SPI is ready to transmit
    while (!(hspi->Instance->SR & SPI_FLAG_TXE));
    // Send data
    hspi->Instance->DR = data;
    // Wait for transmission completion
    while (!(hspi->Instance->SR & SPI_FLAG_RXNE));
}

 

Consult Community and Documentation

  • Check STM32 forums or other developer communities for similar issues and solutions. Often, developers share code snippets and workarounds in community threads.
  • Explore official documentation for your specific IDE and hardware platform. Often, migration guides provide strategies for resolving deprecated function usage.

 

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