no uart library codewarrior for MPC55xx v2.3

[zxiaorong]

I got a mpc5566 evb and tried to use the printf function.  There were three link errors:

undefined: 'InitializedUART' Referenced from '__init_uart_console' in MSL_C.PPCEABI.bare.V.UC.a

...

I found in the CodeWarrior help file that to use console IO function, we need the serial IO library. It gives the path of the library: installDir\PowerPC_EABI_Tools\
CodeWarriorTRK\Transport\processor\ppc\serial\BoardName\Bin

But in my codewarrior folder I didn't find a Transport folder under PowerPC_EABI_Tools\
CodeWarriorTRK\. There are only two file folders Export and Processor.

Doesn't the codewarrior mpc55xx support console IO functions or did I miss something?

Thanks

[stanish]

Hello zxiaorong,

In order to use printf() console function for serial output terminal purposes you have to implement some low level ESCI routines since these functions are not part of a library. TRK libs are no more available in CW for MPC5xxx.

Prototypes needed are defined within <UART.h> file.

1)include prototypes into your code:

#include <UART.h>

If path to "UART.h" is not included within the project please add it into system paths (ALT+F7 -> Access Paths -> "System Paths" -> "Add..." and enter "{Compiler}\PowerPC_EABI_Support\MSL\MSL_C\MSL_Common_Embedded\Include"

2)add implementations of following callback functions that are called internally by printf():

UARTError InitializeUART(UARTBaudRate baudRate);

UARTError ReadUARTN(void* bytes, unsigned long length);

UARTError WriteUARTN(const void* bytes, unsigned long length);

3)functions have to return "kUARTNoError" otherwise pritntf() doesn't output any character. 

See below simple output terminal example. The routines are derived from low level SCI routines available here:  "<CodeWarrior root directory>\(CodeWarrior_Examples)\555x_Cookbook\eSCI-Simple\src\main.c":

UART.c
----------

#include <UART.h>#include "MPC5554.h"
// Initialize UART to 9600 baud, 8 bits, no parity, Tx & Rx enabled
UARTError InitializeUART(UARTBaudRate baudRate) //BaudRate is not used in this simple example
{ 
  /* MPC555x including MPC563x: use the next 3 lines   for either 8 or 40 MHz crystal */
  FMPLL.SYNCR.R = 0x16080000;         /* 8 MHz xtal: 0x16080000; 40MHz: 0x46100000 */
  while(FMPLL.SYNSR.B.LOCK != 1) {};  /* Wait for FMPLL to LOCK  */
  FMPLL.SYNCR.R = 0x16000000;         /* 8 MHz xtal: 0x16000000; 40MHz: 0x46080000 */
  ESCI_A.CR2.R = 0x2000;              /* Module is enabled (default setting ) */
  ESCI_A.CR1.R = 0x01A1000C;          /* 9600 baud, 8 bits, no parity, Tx & Rx enabled */
  /* Use the following two lines for MPC555x */
  SIU.PCR[89].R = 0x400;              /* Configure pad for primary func: TxDA */
  SIU.PCR[90].R = 0x400;              /* Configure pad for primary func: RxDA */
  return kUARTNoError;         /*  Return No Error */
}

// Read UART is empty
UARTError ReadUARTN(void* bytes, unsigned long length)
{
}

// Write UART simply send buffer on ESCI - no ISR used
UARTError WriteUARTN(const void* bytes, unsigned long length)
{
  char *tmp =(char *)bytes;
  unsigned long   j;                   /* Dummy variable */
  for (j=0; j< length; j++)
  {          /* Loop for character string */  
    while (ESCI_A.SR.B.TDRE == 0) {}   /* Wait for transmit data reg empty = 1 */  
    ESCI_A.SR.R = 0x80000000;          /* Clear TDRE flag */  
    ESCI_A.DR.B.D = *(tmp++);          /* Transmit 8 bits Data */
  }   
  return kUARTNoError;         /*  Return No Error */
}

main.c:
-----------

#include <UART.h>
#include <stdio.h>

int main(void)
{
  volatile int i = 0;
  printf("Hello World! %d \n",i);
  ...
}

Stanish

Message Edited by stanish on 2009-09-18 12:02 PM

[zxiaorong]

Hi Stanish,

Thank you for your kind reply. I tried these steps and now there is no link error. But It can't still display anything. I use a P&E debugger and where is the string I want to print supposed to display? In the status window? I debugged the program and it seemed the program didn't end up correctly. But I don't know what's the problem. The program counter jumped to some address 0000204E and then a hard reset occured.

Thanks

Xiaorong