topic Re: UART Driver with Interrupt in Kinetis Microcontrollers

UART Driver with Interrupt

aseem — Tue, 17 Sep 2013 09:51:11 GMT

Hi All,

I've written a UART driver for Kinetis K70 with the Interrupt functionality. So far I'm able to Transmitte the data in polling mode and Recieve data interrupt mode.

Currently the problem I'm facing is that on every transmission and recieption of first byte is Garbage data.

My current settings are,

SIM->SCGC4 |= SIM_SCGC4_UART2_MASK;

SIM->SCGC5 |= SIM_SCGC5_PORTD_MASK;

PORTD->PCR[17] = (3UL << 8);

PORTD->PCR[16] = (3UL << 8);

UART2->S1 = 0x00;

setBaudrate(9600);
UART2->C2 = (UART_C2_RE_MASK | UART_C2_TE_MASK);

UART2->S2 = 0x00;
UART2->C3 = 0x00;

UART2->RWFIFO = UART_RWFIFO_RXWATER(1);
UART2->TWFIFO = UART_TWFIFO_TXWATER(0);
UART2->C2 |= UART_C2_RIE_MASK;
/* Enable UART0 Rx Tx Interrupt in NVIC*/
Enable_IRQ(IRQ_UART2_RX_TX);

/* Enable UART0 Error in NVIC*/
SET_PRIORITY(IRQ_UART2_RX_TX, 240);

Please correct me if I'm going somewhere wrong,

If possible please provide the driver code.

Thanks

Re: UART Driver with Interrupt

jeremyzhou — Wed, 18 Sep 2013 02:18:38 GMT

Hi Chatre,

UART receiver and transmitter are set able should after other registers had been configurated.

So you have a try to move the UART2->C2 = (UART_C2_RE_MASK | UART_C2_TE_MASK); to the last of initialize code.

Re: UART Driver with Interrupt

Robin_Shen — Thu, 26 Sep 2013 08:43:58 GMT

I write a sample code with PE in CodeWarrior10.5 according to Component Serial_LDD Typical Usage "Block reception/transmission, with interrupt service ".

I use the TWR-K70F120M board , uart2 TxDpin=PTE16 RxDpin=PTE17,Baud rate=38400.

Every time you send a 'e' to RxDpin,the TxDpin will send out 'Hello world' and toggle Green LED(PTA29).

Hope it help