Compiler/EK-TM4C123GXL: I used both TimerA of TIMER0_BASE and UART0, then the print of UART0 is error

user5858362

Part Number: EK-TM4C123GXL
Other Parts Discussed in Thread: ENERGIA

Tool/software: TI C/C++ Compiler

Open the TimerA of TIMER0_BASE and UART0 function. the code of TimerA is shown as the below picture:

and the UART0 code is the next picture

then i run my programs, the result is

I doubt that Clock inconsistency is the main reason. But i don't know how to fix this problem. So i need yours help

best regards

xjh

0 Bob Crosby over 4 years ago

I don't see where you set the value of "F_CPU". It should the value returned by SysCtlClockGet().

0 user5858362 over 4 years ago in reply to Bob Crosby

Hey Bob Crosby

The value of F_CPU is 80000000(That is equal to the board‘s frequency 80MHz)

I use the software of Energia to write the Timer.

the following picture is shown the Energia's TimerInit

then I change the code about the TimerA as follow

then the UART0 can output some char as our expect

But ,other problems also happen. the problem is :

I can use UART1, UART2 and other's serial with the baud 115200 as usual. When i change the baud with 9600, the board cannot transport as usual.

What reason leads this problem.

Best regards

xjh

0 Bob Crosby over 4 years ago in reply to user5858362

9600 baud works fine on my setup. Did you remember to change the baudrate on your terminal emulator?

0 user5858362 over 4 years ago in reply to Bob Crosby

I don't know why Timer become normal suddenly today with UART baud 9600.

Thanks,Bob

Best regards

xjh

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