229 lines
7.1 KiB
ArmAsm
Executable File
229 lines
7.1 KiB
ArmAsm
Executable File
/*************************************************************************
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* arch/z16/src/z16f/z16f_lowuart.asm
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* Z16F UART management
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*
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* Copyright (C) 2008, 2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSeqUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*************************************************************************/
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/*************************************************************************
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* Included Files
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*************************************************************************/
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#include <nuttx/config.h>
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#include "chip/chip.h"
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#include "common/up_internal.h"
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#ifdef USE_LOWUARTINIT
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/*************************************************************************
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* External References / External Definitions
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*************************************************************************/
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xdef _z16f_lowuartinit
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xref _SYS_CLK_FREQ:EROM
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#ifdef CONFIG_Z16_LOWPUTC
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xdef _up_lowputc
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#endif
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#ifdef CONFIG_Z16_LOWGETC
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xdef _up_lowgetc
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#endif
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/*************************************************************************
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* Data Allocation
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*************************************************************************/
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define CODESEG, SPACE=EROM
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segment CODESEG
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/*************************************************************************
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* Code
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*************************************************************************/
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/*************************************************************************
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* Name: z16f_lowuartinit
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*
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* Description:
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* Initialize UART0 or UART1
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*
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* Parameters:
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* None
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*
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*************************************************************************/
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_z16f_lowuartinit:
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/* Calculate and set the baud rate generation register */
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#ifdef CONFIG_UART1_SERIAL_CONSOLE
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ld r3, #CONFIG_UART1_BAUD /* r3 = Selected UART1 baud */
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#else
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ld r3, #CONFIG_UART0_BAUD /* r3 = Selected UART0 (default) baud */
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#endif
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ld r0, r3 /* r0 = baud */
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sll r0, #3 /* r0 = baud * 8 */
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add r0, #_SYS_CLK_FREQ /* r3 = freq + baud * 8*/
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sll r3, #4 /* r3 = baud * 16 */
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udiv r0, r3 /* BRG = (freq + baud * 8)/(baud * 16) */
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#ifdef CONFIG_UART1_SERIAL_CONSOLE
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ld.w Z16F_UART1_BR, r0 /* Z16F_UART1_BR = BRG */
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/* Set the GPIO Alternate Function Register Lo (AFL) register */
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ld r0, #%30
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or.b Z16F_GPIOD_AFL, r0 /* Z16F_GPIOD_AFL |= %30 */
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/* Enable UART receive (REN) and transmit (TEN) */
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clr.b Z16F_UART1_CTL1 /* Z16F_UART1_CTL1 = 0 */
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ld r0, #(Z16F_UARTCTL0_TEN|Z16F_UARTCTL0_REN)
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ld.b Z16F_UART1_CTL0, r0 /* Z16F_UART1_CTL0 = %c0 */
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#else
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ld.w Z16F_UART0_BR, r0 /* Z16F_UART0_BR = BRG */
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/* Set the GPIO Alternate Function Register Lo (AFL) register */
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ld r0, #%30
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or.b Z16F_GPIOA_AFL, r0 /* Z16F_GPIOA_AFL |= %30 */
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/* Enable UART receive (REN) and transmit (TEN) */
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clr.b Z16F_UART0_CTL1 /* Z16F_UART0_CTL1 = 0 */
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ld r0, #(Z16F_UARTCTL0_TEN|Z16F_UARTCTL0_REN)
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ld.b Z16F_UART0_CTL0, r0 /* Z16F_UART0_CTL0 = %c0 */
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#endif
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ret /* Return */
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#endif /* USE_LOWUARTINIT */
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/*************************************************************************
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* Name: _up_lowputc
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*
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* Description:
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* Send one character to the selected serial console
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*
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* Parmeters:
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* r1 = character
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*
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* Return:
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* None
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*
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* Modifies r0 (and maybe r1)
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*
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*************************************************************************/
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#ifdef CONFIG_Z16_LOWPUTC
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_up_lowputc:
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/* Check if the character to output is a linefeed */
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ext.ub r0, r1 /* r0=Character masked to 8-bits */
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cp r0, #10 /* Is it a linefeed ('\n') */
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jp ne, _z16f_xmitc /* No? Jump to _z16f_xmitc with character in r1 */
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/* Output a carriage return before the linefeed */
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ld r1, #13 /* Output carriage reuturn ('\r') */
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call _z16f_xmitc /* Call _z16f_xmitc with r1='\r' */
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ld r1, #10 /* Restore r1=linefeed to output */
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/* Fall through to _z16f_xmitc with linefeed in r1 */
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/*************************************************************************
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* Name: _z16f_xmitc
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*
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* Description:
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* Send one character on the selected port (really a part of up_lowputc)
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*
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* Parameters:
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* r1 = character
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*
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* Return:
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* None
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*
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* Modifies r0
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*
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*************************************************************************/
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_z16f_xmitc:
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_z16f_xmitc1:
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ld r0, Z16F_UARTSTAT0_TDRE /* TDRE=Transmitter Data Register Empty */
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#ifdef CONFIG_UART1_SERIAL_CONSOLE
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tm.b Z16F_UART1_STAT0, r0 /* r0 = Z16F_UART1_STAT0 */
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jp eq, _z16f_xmitc1 /* While (!(Z16F_UART1_STAT0 & TDRE)) */
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ld.b Z16F_UART1_TXD, r1 /* Z16F_UART1_TXD = r1 (character) */
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#else
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tm.b Z16F_UART0_STAT0, r0 /* r0 = Z16F_UART0_STAT1 */
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jp eq, _z16f_xmitc1 /* While (!(Z16F_UART0_STAT0 & TDRE)) */
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ld.b Z16F_UART0_TXD, r1 /* Z16F_UART0_TXD = r1 (character) */
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#endif
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ret /* Return */
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#endif /* CONFIG_Z16_LOWPUTC */
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/*************************************************************************
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* Name: _up_lowgetc
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*
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* Description:
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* Get a character from the serial port
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*
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* Parmeters:
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* None
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*
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* Return
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* R0 = Character read
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*
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*************************************************************************/
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#ifdef CONFIG_Z16_LOWGETC
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_up_lowgetc:
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_up_lowgetc1:
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ld r0, #Z16F_UARTSTAT0_RDA /* RDA=Receive data available */
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#ifdef CONFIG_UART1_SERIAL_CONSOLE
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tm.b Z16F_UART1_STAT0, r0
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jp eq, _up_lowgetc1 /* While (!Z16F_UART1_STAT0 & RDA)) */
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ld.ub r0, Z16F_UART1_RXD /* r0 = Z16F_UART1_RXD */
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#else
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tm.b Z16F_UART0_STAT0,r0 /* While (!Z16F_UART0_STAT0 & RDA) */
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jp eq, _up_lowgetc1
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ld.ub r0, Z16F_UART0_RXD /* r0 = Z16F_UART0_RXD */
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#endif
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cp r0, #%0d /* Test for '\r' */
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jp eq, _up_lowgetc2
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cp r0, #%0d /* Test \r + high bit */
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jp ne, _up_lowgetc3
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_up_lowgetc2:
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ld r0, #%0a /* Convert '\r' to '\n' */
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_up_lowgetc3: /* Return value in r0 */
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ret /* Return */
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#endif
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end
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