uart.h

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/******************************************************************************
**                                                                           **
**  Copyright (c) 2004 ARM Limited                                           **
**  All rights reserved                                                      **
**                                                                           **
******************************************************************************/

/******************************************************************************
*                                                                             *
* The following are for the Versatile UART system. These are bits to enable   *
* the functions in the Command Registers and the individual masks for the     *
* returned Status registers                                                   *
* Register Bits - these require to be set to enable the defined functions     *
*                                                                             *
******************************************************************************/

#ifndef __UARTDEF
#define __UARTDEF

/*****************************************************************************/
/* UART Structure maps to register offsets                                   */
/* Structure is instantiated in UART.c and placed by scatter file            */
/*****************************************************************************/

struct uart
{ volatile unsigned dr;     // @0x0
  volatile unsigned ecr;    // @0x4
  volatile unsigned lcrh;   // @0x8
  volatile unsigned lcrm;   // @0x0c
  volatile unsigned lcrl;   // @0x10
  volatile unsigned cr;     // @0x14
  volatile unsigned fr;     // @0x18
  volatile unsigned iir;    // @0x1C
  volatile unsigned ilpr;   // @0x20
  volatile unsigned ibrd;   // @0x24
  volatile unsigned fbrd;   // @0x28
  volatile unsigned lcrh11; // @0x2C
  volatile unsigned cr11;   // @0x30
};

#define UART_SPEED                  38400

/*****************************************************************************/
/* Line Control High Byte Register - LCRH                                    */
/*****************************************************************************/
#define LCRH_Word_Length_8          0x60
#define UART_PL011_LCRH_FEN         (1 << 4)

/*****************************************************************************/
/* Control Register - CR                                                     */
/*****************************************************************************/
#define CR_UART_Enable              0x01
#define UART_PL011_CR_TXE           (1 << 8)
#define UART_PL011_CR_RXE           (1 << 9)

/*****************************************************************************/
/* Flag Register - FR                                                        */
/*****************************************************************************/
#define FR_RX_Fifo_Empty            0x10
#define FR_TX_Fifo_Full             0x20
#define FR_RX_Fifo_Full             0x40
#define FR_TX_Fifo_Empty            0x80

#endif