74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
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/***************************************************************************
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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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}
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