CODEWITHSUNDEEP
clcdstm32f4
Joe P
Joe P

Reputation: 79

How to display uint32 variable on STM32 correctly with DisplayStringAtLine function

I am trying to display a uint32_t value on an LCD display (Waveshare 3.2inch TFT) connected to a STM32F407 evaluation board. The library provided by Waveshare includes a function BSP_LCD_DisplayStringAtLine. I have got this working fine for string output but when I try to send it a uint32_t value it just displays corrupt data on the LCD on the line where the value should print.

I have tried using

BSP_LCD_DisplayStringAtLine (3, (uint8_t*) Difference);

and also

BSP_LCD_DisplayStringAtLine (3, (uint8_t*) &Difference);

but generate nonsense. I think I am probably passing the variable to the function incorrectly but the documentation provided by the manufacturer is not exactly comprehensive and I'm not finding much help on Google.

Upvotes: 1

Views: 1322

Answers (1)

agh2k
agh2k

Reputation: 11

You need to convert the uint32_t to a string first.

Pseudocode:

uint32_t value = 7;
uint8_t buf[16]; // pick a large enough size
u32_to_u8str(value, buf); // assuming this null terminates the string
BSP_LCD_DisplayStringAtLine(3, &buf);

This question may have useful answers.

Upvotes: 1

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