topic Re: UART KWIKSTIK in Kinetis Microcontrollers

UART KWIKSTIK

chrissanchez — Sun, 02 Dec 2012 05:53:25 GMT

I'm using device initialization to initialize the KwikStik with uart, and I´ve created two functions with the routines, can somebody tell me what am I doing wrong???

I´m using TWR-SER to engage the communication with my pc

char uart_getchar (void)

{

/* Wait until character has been received */

while ((UART5_S1 & 0x40)==0)

{asm(nop);}

(void) UART5_S1;

/* Return the 8-bit data from the receiver */

return UART5_D;

}

void uart_putchar (char ch)

{

(void) UART5_S1;

/* Send the character */

UART5_D = (char)ch;

while ((UART5_S1 & 0x40)==0)

{asm(nop);}

(void) UART5_S1;

retardo(10);

}

Re: UART KWIKSTIK

alejandrolozan1 — Thu, 14 Feb 2013 17:36:23 GMT

Hi,

Bellow you can find an example of code that sends and receives using the UART.

/********************************************************************/

* Wait for a character to be received on the specified UART

* Parameters:

* channel UART channel to read from

* Return Values:

* the received character

char uart_getchar (UART_MemMapPtr channel)

{

/* Wait until character has been received */

while (!(UART_S1_REG(channel) & UART_S1_RDRF_MASK));

/* Return the 8-bit data from the receiver */

return UART_D_REG(channel);

}

/********************************************************************/

* Wait for space in the UART Tx FIFO and then send a character

* Parameters:

* channel UART channel to send to

* ch character to send

void uart_putchar (UART_MemMapPtr channel, char ch)

{

/* Wait until space is available in the FIFO */

while(!(UART_S1_REG(channel) & UART_S1_TDRE_MASK));

/* Send the character */

UART_D_REG(channel) = (uint8)ch;

}

Re: UART KWIKSTIK

chrissanchez — Mon, 29 Jul 2013 14:40:05 GMT

Thanks Alejandro, at the end I figure it out how to do it reading some flags, and it works also perfect, although I think your way is more accurate, here is my code

char uart_getchar (void)

{

(void) UART5_S1;/*dummy read from S1 register*/

/* Wait until character has been received */

while ((UART5_S1 & 0x20)==0)

{asm(nop);}

/* Return the 8-bit data from the receiver */

return UART5_D;

}

/****************************************************/

/* 9600 Baud=> BDR=163 BRF=>1 */

/* 57600 Baud=> BDR=27 BRF=>6 */

/****************************************************/

void uart_putchar (char ch)

{

(void) UART5_S1;

/* Send the character */

UART5_D = (char)ch;

while ((UART5_S1 & 0x40)==0)

{asm(nop);}

(void) UART5_S1;

retardo(150);

}

Moreover, thanks for your answer