kopia lustrzana https://github.com/OpenRTX/OpenRTX
63 wiersze
2.4 KiB
C
63 wiersze
2.4 KiB
C
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/***************************************************************************
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* Copyright (C) 2020 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* This program 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. See the *
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* 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 *
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#include "AT24Cx.h"
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#include <I2C0.h>
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#include <gpio.h>
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#include <delays.h>
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#include <stdint.h>
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#include <hwconfig.h>
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static const uint8_t devAddr = 0xA0; /* EEPROM I2C address */
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void AT24Cx_init()
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{
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gpio_setMode(I2C_SDA, OPEN_DRAIN);
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gpio_setMode(I2C_SCL, OPEN_DRAIN);
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gpio_setAlternateFunction(I2C_SDA, 3);
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gpio_setAlternateFunction(I2C_SCL, 3);
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i2c0_init();
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}
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void AT24Cx_terminate()
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{
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i2c0_terminate();
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gpio_setMode(I2C_SDA, INPUT);
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gpio_setMode(I2C_SCL, INPUT);
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}
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void AT24Cx_readData(uint32_t addr, void* buf, size_t len)
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{
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uint16_t a = __builtin_bswap16((uint16_t) addr);
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/*
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* On GDx devices the I2C bus is shared between the EEPROM and the AT1846S,
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* so we have to acquire exclusive ownership before exchanging data
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*/
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i2c0_lockDeviceBlocking();
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i2c0_write(devAddr, &a, 2, false);
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delayUs(10);
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i2c0_read(devAddr, buf, len);
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i2c0_releaseDevice();
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}
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