Problem in uart of TWR-K20D72M EVM

parthmodi — Mon, 30 May 2016 10:49:11 GMT

Hi,

I am evaluating TWR-K20D72M EVM board. In my scenario i want to interface the WiFi and GSM module this EVM.

So,I interfaced the GS2100MIE WiFi module with UART0 of this EVM and i send AT command sequence as per my application.

i am requesting to addressing my below listed queries,

-If i connect the WIFI module directly with uart port of TWR-K20D72M board than communication is not working.

-If i connect USB-to-UART dongle in between WIFI module and TWR-K20D72M EVM board than the communication is working fine.

I attached below code for your reference.

#################################################################################

#include "common.h"

#include "uart.h"

#include "isr.h"

#include "lptmr.h"

unsigned char data='a';

char RxCh;

static uint8 i=0;

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

void uart_config(void)

{

//uart0 intialized

PORTD_PCR6 = PORT_PCR_MUX(3);//rx

PORTD_PCR7 = PORT_PCR_MUX(3);//tx

//uart_init function for set bauard rate and clock

uart_init(UART0_BASE_PTR,72000,9600);

}

void uart_app_init(void)

{

enable_irq(INT_UART0_RX_TX-16);

UART_C2_REG(UART0_BASE_PTR)|= UART_C2_RIE_MASK ; //enable RDRF interrupt

}

void main (void)

{

uart_config();

uart_app_init();

lptmr_init(0x01110,3);

enable_irq(INT_LPTimer-16);

uart_send_str("AT\r\n",UART0_BASE_PTR);

while(1);

}

void isr_uart0_tx_rx(void)

{

while (!(UART_S1_REG(UART0_BASE_PTR) & UART_S1_RDRF_MASK)); // clear RDRF flag

RxCh = UART_D_REG(UART0_BASE_PTR); // Return the 8-bit data from the receiver

printf("%c",RxCh);

}

#############################################################################################

Please let me know if you need more information from our side.

Any help in this case will be appreciated ?

Thanks,

Parth

Kinetis MicrocontrollersのトピックProblem in uart of TWR-K20D72M EVM

Problem in uart of TWR-K20D72M EVM