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