How to fix Keil error C129: “missing ‘;'” without any missing semicolon (EFM8)

Problem:

You have source code like

uint16_t convert(uint16_t input) {
   return input * 2;
}

that you want to compile using EFM8

// *** ERROR C129 IN LINE 1 OF C:\Users\user\TestProject\src\Test.c: missing ';' before 'convert'

Solution:

Keil doesn’t know what theĀ uint16_t before the declaration of convert().

#include <stdint.h>

stdint.h contains declarations for several standard integer types likeĀ uint8_t, uint16_t, uint32_t, int16_t etc.

The final code should look like this:

#include <stdint.h>

uint16_t convert(uint16_t input) {
    return input * 2;
}