117 lines
2.2 KiB
C
117 lines
2.2 KiB
C
/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2012-04-25 weety first version
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*/
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#include <rtdevice.h>
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#include <rthw.h>
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#include <at91sam9g45.h>
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static void at91_i2c_gpio_init()
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{
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AT91C_BASE_PMC->PMC_PCER = 1 << AT91C_ID_PIOA; //enable PIOA clock
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AT91C_BASE_PIOA->PIO_PUER = (1 << 23);
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AT91C_BASE_PIOA->PIO_PER = (1 << 23);
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AT91C_BASE_PIOA->PIO_MDER = (1 << 23);
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AT91C_BASE_PIOA->PIO_PUER = (1 << 24);
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AT91C_BASE_PIOA->PIO_PER = (1 << 24);
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AT91C_BASE_PIOA->PIO_MDER = (1 << 24);
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AT91C_BASE_PIOA->PIO_OER = (1 << 23);
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AT91C_BASE_PIOA->PIO_OER = (1 << 24);
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AT91C_BASE_PIOA->PIO_SODR = (1 << 23);
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AT91C_BASE_PIOA->PIO_SODR = (1 << 24);
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}
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static void at91_set_sda(void *data, rt_int32_t state)
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{
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if (state)
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{
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AT91C_BASE_PIOA->PIO_SODR = (1 << 23);
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}
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else
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{
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AT91C_BASE_PIOA->PIO_CODR = (1 << 23);
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}
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}
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static void at91_set_scl(void *data, rt_int32_t state)
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{
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if (state)
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{
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AT91C_BASE_PIOA->PIO_SODR = (1 << 24);
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}
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else
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{
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AT91C_BASE_PIOA->PIO_CODR = (1 << 24);
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}
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}
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static rt_int32_t at91_get_sda(void *data)
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{
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return AT91C_BASE_PIOA->PIO_PDSR & (1 << 23);
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}
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static rt_int32_t at91_get_scl(void *data)
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{
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return AT91C_BASE_PIOA->PIO_PDSR & (1 << 24);
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}
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static void at91_udelay (rt_uint32_t us)
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{
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rt_int32_t i;
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for (; us > 0; us--)
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{
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i = 50000;
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while(i > 0)
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{
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i--;
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}
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}
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}
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static const struct rt_i2c_bit_ops bit_ops = {
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RT_NULL,
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at91_set_sda,
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at91_set_scl,
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at91_get_sda,
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at91_get_scl,
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at91_udelay,
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5,
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100
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};
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int at91_i2c_init(void)
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{
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struct rt_i2c_bus_device *bus;
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bus = rt_malloc(sizeof(struct rt_i2c_bus_device));
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if (bus == RT_NULL)
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{
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rt_kprintf("rt_malloc failed\n");
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return -RT_ENOMEM;
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}
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rt_memset((void *)bus, 0, sizeof(struct rt_i2c_bus_device));
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bus->priv = (void *)&bit_ops;
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at91_i2c_gpio_init();
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rt_i2c_bit_add_bus(bus, "i2c0");
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return 0;
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}
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INIT_DEVICE_EXPORT(at91_i2c_init);
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