131 lines
3.1 KiB
C
131 lines
3.1 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) 2021 by Tomasz Moń
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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 "kernel.h"
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#include "system.h"
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#include "spi.h"
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#include "avr-sansaconnect.h"
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#include "libertas/if_spi_drv.h"
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#define IO_SERIAL0_XMIT (0x100)
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void libertas_spi_init(void)
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{
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IO_GIO_DIR0 &= ~((1 << 4) /* CS */ | (1 << 3) /* reset */);
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libertas_spi_reset(1);
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libertas_spi_cs(1);
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/* Enable the clock */
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bitset16(&IO_CLK_MOD2, CLK_MOD2_SIF0);
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/* Disable transmitter */
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IO_SERIAL0_TX_ENABLE = 0x0001;
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/* SELSDEN = 0, SLVEN = 0, SIOCLR = 0, SCLKM = 1, MSB = 1, MSSEL = 0,
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* RATE = 2 -> 15MHz
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*/
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IO_SERIAL0_MODE = 0x0601;
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/* Disable the clock */
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bitclr16(&IO_CLK_MOD2, CLK_MOD2_SIF0);
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/* Make sure the SPI clock is not inverted */
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bitclr16(&IO_CLK_INV, CLK_INV_SIF0);
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}
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void libertas_spi_reset(int high)
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{
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if (high)
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{
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IO_GIO_BITSET0 = (1 << 3);
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}
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else
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{
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IO_GIO_BITCLR0 = (1 << 3);
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}
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}
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void libertas_spi_pd(int high)
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{
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avr_hid_wifi_pd(high);
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}
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void libertas_spi_cs(int high)
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{
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if (high)
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{
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IO_GIO_BITSET0 = (1 << 4);
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}
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else
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{
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IO_GIO_BITCLR0 = (1 << 4);
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}
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}
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void libertas_spi_tx(const uint8_t *buf, int len)
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{
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/* Enable the clock */
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bitset16(&IO_CLK_MOD2, CLK_MOD2_SIF0);
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IO_SERIAL0_TX_ENABLE = 0x0001;
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while (len > 0)
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{
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IO_SERIAL0_TX_DATA = *(buf + 1);
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while (IO_SERIAL0_RX_DATA & IO_SERIAL0_XMIT) {};
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IO_SERIAL0_TX_DATA = *buf;
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while (IO_SERIAL0_RX_DATA & IO_SERIAL0_XMIT) {};
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buf += 2;
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len -= 2;
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}
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IO_SERIAL0_TX_ENABLE = 0x0000;
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/* Disable the clock */
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bitclr16(&IO_CLK_MOD2, CLK_MOD2_SIF0);
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}
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void libertas_spi_rx(uint8_t *buf, int len)
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{
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/* Enable the clock */
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bitset16(&IO_CLK_MOD2, CLK_MOD2_SIF0);
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IO_SERIAL0_TX_ENABLE = 0x0001;
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while (len > 0)
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{
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uint16_t data;
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IO_SERIAL0_TX_DATA = 0;
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while ((data = IO_SERIAL0_RX_DATA) & IO_SERIAL0_XMIT) {};
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*(buf + 1) = data & 0xFF;
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IO_SERIAL0_TX_DATA = 0;
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while ((data = IO_SERIAL0_RX_DATA) & IO_SERIAL0_XMIT) {};
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*buf = data & 0xFF;
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buf += 2;
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len -= 2;
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}
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IO_SERIAL0_TX_ENABLE = 0x0000;
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/* Disable the clock */
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bitclr16(&IO_CLK_MOD2, CLK_MOD2_SIF0);
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}
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