Kinetis Microcontrollers中的主题 Floating point value

Floating point value

chetan98 — Thu, 16 Oct 2025 17:22:38 GMT

I'm using Kw45 sdk example, for KW45 board I'd like to print the Floating point accelerometer values to the terminal using shell I also tried.

sprintf(str,"%f");

printf("%s",str);

IDE using MCU expresso

But using printf or sprintf it is not printing even decimal value.

Thanks

Chetan

Re: Floating point value

luis_maravilla — Thu, 16 Oct 2025 23:46:01 GMT

Hello Chetan,

Could you help us confirm what example are you using and for which SDK version please?

In the [ble_shell] example from the KW45 SDK, values are printed to the terminal using the function [SHELL_PrintfSynchronization], which is defined in [ble_shell.h].

To print integer values, the SDK uses [shell_writeDec], which internally calls [FORMAT_Dec2Str] to convert integers into strings. This conversion process is implemented in [fsl_format.c].

Using this approach as a reference, you could apply a similar method to convert floating-point values to strings and send to terminal.

Hope this information work for you.

Best Regards

Luis

Re: Floating point value

chetan98 — Fri, 24 Oct 2025 06:21:47 GMT

Hello Happy Diwali,

I am using Kw45 wireless uart and I want print value with 3 precision after point.

For eg 300.645

Thanks

Chetan

Re: Floating point value

sofiaurueta — Tue, 28 Oct 2025 18:39:01 GMT

Hello @chetan98 ,

Similarly to the ble_shell example, in the wireless_uart example, values are printed to the terminal using Serial_PrintDec function, which internally calls FORMAT_Dec2Str to convert integers into strings. See fsl_format.c for the conversion process:

/*Convert a uint32 to string*/

uint8_t *FORMAT_Dec2Str(uint32_t num)

Using this function as reference, you could implement a function to convert floating-point values to strings through a division-based method (split the float into its integer and decimal parts, convert each part to a string separately, and then combine them with a decimal point in between).

Best Regards,
Ana Sofia.