Getting FileSystem example working without ULINK - Keil forum - Support forums

Thanks for directions. It seems I made good progress. But I am still not able to see output.
Used retarget template you provided. Added stdout_UART.c/stdin_UART/stderr_UART.c in
project using templates. Now changed the functions in retarget.c to use them. Configured UART1 to
be used in these function and then enabled UART1 in RTE_Device.c. I added below code
to init UART. I can see them initialized properly as no error returned.
But still I can't see printf output in serial viewer connect on same baud rate
I configured. Based LED blicking seems like it's output but not sure where to see.
I have serial viewer connected but nothing there. Not sure what I am missing.
Can you please advise? Please note I am using FRDM K64F with MDK latest.

status = stdout_init (); if(!status) { status = stdin_init (); if(!status) { status = stderr_init (); if(status){ printf ("Error Initializing stderr 0x%x\n> ", status); } else { printf ("All STDIO completed 0x%x\n> ", status); } } }

UART init for stdout:

/*----------------------------------------------------------------------------- * Name: stdout_USART.c * Purpose: STDOUT USART Template * Rev.: 1.0.0 *-----------------------------------------------------------------------------*/

#include "Driver_USART.h"

//-------- <<< Use Configuration Wizard in Context Menu >>> --------------------

// <h>STDOUT USART Interface

// <o>Connect to hardware via Driver_USART# <0-255>
// Select driver control block for USART interface
#define USART_DRV_NUM 1

// <o>Baudrate
#define USART_BAUDRATE 115200

// </h>

#define _USART_Driver_(n) Driver_USART##n
#define USART_Driver_(n) _USART_Driver_(n)

extern ARM_DRIVER_USART USART_Driver_(USART_DRV_NUM);
#define ptrUSART (&USART_Driver_(USART_DRV_NUM))

/** Initialize stdout

\return 0 on success, or -1 on error.
*/
int stdout_init (void) { int32_t status;

status = ptrUSART->Initialize(NULL); if (status != ARM_DRIVER_OK) return (-1);

status = ptrUSART->PowerControl(ARM_POWER_FULL); if (status != ARM_DRIVER_OK) return (-1);

status = ptrUSART->Control(ARM_USART_MODE_ASYNCHRONOUS | ARM_USART_DATA_BITS_8 | ARM_USART_PARITY_NONE | ARM_USART_STOP_BITS_1 | ARM_USART_FLOW_CONTROL_NONE, USART_BAUDRATE); if (status != ARM_DRIVER_OK) return (-1);

status = ptrUSART->Control(ARM_USART_CONTROL_TX, 1); if (status != ARM_DRIVER_OK) return (-1);

return (0);
}

/** Put a character to the stdout

\param[in] ch Character to output \return The character written, or -1 on write error.
*/
int stdout_putchar (int ch) { uint8_t buf[1];

buf[0] = ch; if (ptrUSART->Send(buf, 1) != ARM_DRIVER_OK) { return (-1); } while (ptrUSART->GetTxCount() != 1); return (ch);
}

Here is my retarget.c:

/******************************************************************************/
/* RETARGET.C: 'Retarget' layer for target-dependent low level functions */
/******************************************************************************/
/* This file is part of the uVision/ARM development tools. */
/* Copyright (c) 2005 Keil Software. All rights reserved. */
/* This software may only be used under the terms of a valid, current, */
/* end user licence from KEIL for a compatible version of KEIL software */
/* development tools. Nothing else gives you the right to use this software. */
/******************************************************************************/

#include <stdio.h>
#include <time.h>
#include <rt_misc.h>

#pragma import(__use_no_semihosting_swi)

extern int stdout_putchar(int ch);
extern int stdin_getchar(void);
extern long timeval;

struct __FILE { int handle; /* Add whatever you need here */ };
//FILE __stdout;
//FILE __stdin;

int fputc(int ch, FILE *f) { return (stdout_putchar(ch));
}

int fgetc(FILE *f) { return (stdout_putchar(stdin_getchar()));
}

int ferror(FILE *f) { /* Your implementation of ferror */ return EOF;
}

void _ttywrch(int ch) { stdout_putchar (ch);
}

void _sys_exit(int return_code) { while (1); /* endless loop */
}