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SW4STM32 and SW4Linux fully supports the STM32MP1 asymmetric multicore Cortex/A7+M4 MPUs

   With System Workbench for Linux, Embedded Linux on the STM32MP1 family of MPUs from ST was never as simple to build and maintain, even for newcomers in the Linux world. And, if you install System Workbench for Linux in System Workbench for STM32 you can seamlessly develop and debug asymmetric applications running partly on Linux, partly on the Cortex-M4.
You can get more information from the ac6-tools website and download (registration required) various documents highlighting:

System Workbench for STM32

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Why is the pointer only 1 byte while the Size is 2 bytes? Sense?

Posted by BenoitHanridge on 2016-03-18 23:06

Hi Everyone,

This is about a HAL_SPI_Transmit().

When looking in ST’s help file STM32F103xG HAL User Manual.chm HAL_SPI_Transmit(), *pData is uint8_t of type while Size is of uint16_t type. That doesn’t make sense. How can a pointer only reach 255 while the size can go up to 65535. I don’t see any practical purpose in this. It’s funny. Isn’t a 1MB memory address a lot wider than 1 byte? Sure it is, not? So what exactly is pData then?

Greets,
Ben

ps: The ST help screenshot for HAL_SPI_Transmit() is attached.

HAL_SPI_Transmit_for_my_stm32f1xx.png (273.82 Kb)
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Posted by Reynard on 2016-03-19 11:23

pData is a pointer pointing to an array of 8 bit bytes or similar object.

The pointer itself is probably 32 bits.

Cheers

Reynard

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