topic Re: UART transmit error in Kinetis Microcontrollers

UART transmit error

philippadolph — Thu, 02 Mar 2017 18:10:24 GMT

I have a TWR-K60F120M Board and my problem is the uart interrupt routine.

In my main i created an array with 4 numbers

int a[4]={1 , 2 , 3, 4};

UART0_C2 |= UART_C2_TCIE_MASK;

i wanted to start the interrupt with the transmission complete flag

In my interrupt routine

extern int a[];

int i =0;

void UART_IRQ

{

while(i<4)

{

UART0_D=a[i];

i++

}

UART0_C2 &= ~UART_C2_TCIE_MASK;

i=0;

}

I don't receive the numbers from the uart and i don't know why .

Maybe someone know where i'm mistaken.

Re: UART transmit error

mjbcswitzerland — Thu, 02 Mar 2017 21:52:39 GMT

References:
http://www.utasker.com/kinetis/TWR-K60F120M.html
http://www.utasker.com/docs/uTasker/uTaskerUART.PDF

I think you need to use the transmit data register empty interrupt to start transmission like this (the complete interrupt is set after the final bit of a character is sent).
Also you need to send one byte at a time and wait for the output FIFO to be free before sending the next (depends on the FIFO depth).

Attached is the uTasker UART driver as reference which allows interrupt and DMA operation on all LPUART and UARTs.
To save time just use the uTasker K60F120 Open Source project which includes all that you need, is documented and allows the K60F120 to be simulated, including UART interrupts/DMA.
Complete code is available at http://www.utasker.com/forum/index.php?topic=1721.msg7086#msg7086

Regards

Mark

Re: UART transmit error

Robin_Shen — Tue, 07 Mar 2017 04:30:27 GMT

You can refer the attached test project. I test it on TWR-K60F120M board with CodeWarrior10.7.

Best Regards,

Robin

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