错误：没有重载函数“ mbed :: Ticker :: attach”的实例与参数列表匹配

Question

I set up the ticker here:

Ticker readSample;


uint16_t* sample() {
    samples[sCount]=sensor.read_u16(); 
    sCount++; 
    if(sCount == 159) {
        sCount = 0;
    }
    return samples; 
}

And called it in main function here:

int main() {
readSample.attach(&sample, 0.0125);

I get error code 304, no idea how to overcome this. Cant find a straight answer that's transferrable to my work.

Error: No instance of overloaded function "mbed::Ticker::attach" matches the argument list in "main.cpp", Line: 142, Col: 17

First time poster, total amateur at coding, any and all help/advice is massively appreciated.

Answer 1

The return type of an attached function has to be void. You cannot return uint16_t*. Here is the function declaration.

attach (Callback< void()> func, float t)

You can learn more about Ticker class here. https://os.mbed.com/docs/mbed-os/v5.11/apis/ticker.html