bbb789120c
The driver is current unused and very minimal. It can used on targets which have an accessible UART port and it will be used on some creative targets as backlight control. Change-Id: Id710d63574aadb0a2d7327b03187506b469470b1
74 lines
No EOL
2.3 KiB
C
74 lines
No EOL
2.3 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2013 by Lorenzo Miori
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "uartdbg-imx233.h"
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#include "pinctrl-imx233.h"
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#include "clkctrl-imx233.h"
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void imx233_uartdbg_init(unsigned long baud)
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{
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/* Enable UART clock */
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imx233_clkctrl_enable(CLK_UART, true);
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/* Configure UART pins */
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imx233_pinctrl_setup_vpin(VPIN_UARTDBG_TX, "uartdbg tx", PINCTRL_DRIVE_4mA, false);
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imx233_pinctrl_setup_vpin(VPIN_UARTDBG_RX, "uartdbg rx", PINCTRL_DRIVE_4mA, false);
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/* Set baud rate */
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HW_UARTDBG_IBRD = baud >> 16;
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HW_UARTDBG_FBRD = baud & 0xFFFF;
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/* Set port options (actually needed to set baud rate), 8 bit char, enable FIFO buffer */
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BF_WR(UARTDBG_LCR_H, WLEN, 3);
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BF_WR(UARTDBG_LCR_H, FEN, 1);
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/* Finally enable UART device, TX enable, RX enable, device enable */
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BF_WR(UARTDBG_CR, TXE, 1);
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BF_WR(UARTDBG_CR, RXE, 1);
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BF_WR(UARTDBG_CR, UARTEN, 1);
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}
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void imx233_uartdbg_send(unsigned char data)
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{
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/* Wait to transmit if TX FIFO buffer is full*/
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while (BF_RD(UARTDBG_FR, TXFF));
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BF_WR(UARTDBG_DR, DATA, data);
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}
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void uart_tx(const char* data)
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{
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while (*data != 0)
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imx233_uartdbg_send(*data++);
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}
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unsigned int uart_rx(char* rx_buf, unsigned int len)
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{
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unsigned int i = 0;
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while(i < len)
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{
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/* Check if the UART Rx Buffer has something into -> RXFE */
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if(!BF_RD(UARTDBG_FR, RXFE))
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{
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rx_buf[i] = HW_UARTDBG_DR;
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i++;
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}
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}
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return i;
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} |