ChibiOS Free Embedded RTOS

Yeah sorry, I forgot to attach them -.-


~ Tectu

disregard my fault..

ok that works but how do i tie that to samples

Use the value from the ADC conversion, calculate the voltage level out of it and display it. If you want to use it with multiple threads, make sure you use mutexes or semaphores in order to get a correct read out of the values since they are not atomic.


~ Tectu

i have tried getting the voltage to display this way:
float voltage = (adcsample_t) samples2[0];
sprintf(buffer, "voltage: %fV", voltage);
but it reads " voltage:4063.000000V" off a 3v pin.
am i doing it correctly or should i be doing some sort of calculation first?

Yes, as I said three times before, you first have to calculate the real voltage level out of the ADC value.



~ Tectu

sorry about that i did not realize what you meant until you hit me with it
everything is working good now except when i try to use the buffer to give a drawline value eg. 245(i have striped the buffer back to that) it will not work i get the assignment makes pointer from integer without a cast error.
i an use the buffer in drawstring and it works fine is there a way to get it to work the way i want?

I'm sorry but I don't exactly understand what you want to do nor the problem you're hitting. Can you please explain what you want to do, what you did and attach the code part including the compiler errors?


~ Tectu

Ok this is what i am doing..

And this is the error

Changes highlighted in red.

float voltage = ((adcsample_t) samples2[0]*2.45/4096);
sprintf(buffer, "voltage: %.2fV", voltage);
gdispDrawString(10, 150, buffer1, font1, White); // This works fine and displays "voltage:2.45V"
gdispDrawLine(300, 470, 300, (coord_t)(voltage*100.0), Red);