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//
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//
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// Copyright 2010 TheSeven
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//
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//
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// This file is part of emBIOS.
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//
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// emBIOS is free software: you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation, either version 2 of the
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// License, or (at your option) any later version.
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//
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// emBIOS is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// See the GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with emBIOS. If not, see <http://www.gnu.org/licenses/>.
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//
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//
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#include "global.h"
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#include "i2c.h"
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#include "thread.h"
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#include "s5l8720.h"
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static struct mutex i2cmutex;
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void i2c_init()
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{
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mutex_init(&i2cmutex);
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}
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void i2c_send(uint32_t bus, uint32_t device, uint32_t address, const uint8_t* data, uint32_t length)
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{
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mutex_lock(&i2cmutex, TIMEOUT_BLOCK);
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IICDS(bus) = device & ~1;
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IICSTAT(bus) = 0xF0;
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IICCON(bus) = 0xB7;
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while ((IICCON(bus) & 0x10) == 0) yield();
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if (address >= 0)
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{
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/* write address */
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IICDS(bus) = address;
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IICCON(bus) = 0xB7;
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while ((IICCON(bus) & 0x10) == 0) yield();
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}
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/* write data */
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while (length--)
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{
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IICDS(bus) = *data++;
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IICCON(bus) = 0xB7;
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while ((IICCON(bus) & 0x10) == 0) yield();
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}
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/* STOP */
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IICSTAT(bus) = 0xD0;
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IICCON(bus) = 0xB7;
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while ((IICSTAT(bus) & (1 << 5)) != 0) yield();
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mutex_unlock(&i2cmutex);
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}
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void i2c_recv(uint32_t bus, uint32_t device, uint32_t address, uint8_t* data, uint32_t length)
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{
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mutex_lock(&i2cmutex, TIMEOUT_BLOCK);
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if (address >= 0)
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{
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/* START */
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IICDS(bus) = device & ~1;
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IICSTAT(bus) = 0xF0;
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IICCON(bus) = 0xB7;
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while ((IICCON(bus) & 0x10) == 0) yield();
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/* write address */
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IICDS(bus) = address;
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IICCON(bus) = 0xB7;
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while ((IICCON(bus) & 0x10) == 0) yield();
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}
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/* (repeated) START */
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IICDS(bus) = device | 1;
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IICSTAT(bus) = 0xB0;
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IICCON(bus) = 0xB7;
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while ((IICCON(bus) & 0x10) == 0) yield();
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while (length--)
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{
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IICCON(bus) = (length == 0) ? 0x37 : 0xB7; /* NACK or ACK */
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while ((IICCON(bus) & 0x10) == 0) yield();
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*data++ = IICDS(bus);
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}
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/* STOP */
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IICSTAT(bus) = 0x90;
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IICCON(bus) = 0xB7;
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while ((IICSTAT(bus) & (1 << 5)) != 0) yield();
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mutex_unlock(&i2cmutex);
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}
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void i2c_sendbyte(uint32_t bus, uint32_t device, uint32_t address, uint32_t data)
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{
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uint8_t buf[1];
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buf[0] = data;
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i2c_send(bus, device, address, buf, 1);
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}
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uint8_t i2c_recvbyte(uint32_t bus, uint32_t device, uint32_t address)
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{
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uint8_t buf[1];
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i2c_recv(bus, device, address, buf, 1);
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return buf[0];
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}
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