120 lines
2.9 KiB
C
120 lines
2.9 KiB
C
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/*
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* Copyright (c) 2006-2023, 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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* 2023-07-27 Chushicheng the first version
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*/
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#include "drv_i2c.h"
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#include "pico/binary_info.h"
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#include "hardware/gpio.h"
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#include "hardware/i2c.h"
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#ifdef BSP_USING_I2C
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#define DBG_TAG "drv.i2c"
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#define DBG_LVL DBG_INFO
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#include <rtdbg.h>
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struct pico_i2c_bus
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{
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struct rt_i2c_bus_device parent;
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i2c_inst_t *handle;
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rt_uint8_t i2c_sda_pin;
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rt_uint8_t i2c_scl_pin;
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rt_uint32_t baud;
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char *device_name;
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};
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static struct pico_i2c_bus pico_i2c_obj[] =
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{
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#ifdef BSP_USING_I2C0
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{
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.handle = i2c0,
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.i2c_sda_pin = BSP_I2C0_SDA_PIN,
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.i2c_scl_pin = BSP_I2C0_SCL_PIN,
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.baud = 400000U,
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.device_name = "i2c0",
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},
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#endif
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#ifdef BSP_USING_I2C1
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{
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.handle = i2c1,
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.i2c_sda_pin = BSP_I2C1_SDA_PIN,
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.i2c_scl_pin = BSP_I2C1_SCL_PIN,
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.baud = 400000U,
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.device_name = "i2c1",
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},
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#endif
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};
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rt_ssize_t pico_i2c_xfer(struct rt_i2c_bus_device *bus,
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struct rt_i2c_msg msgs[],
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rt_uint32_t num)
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{
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struct rt_i2c_msg *msg;
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rt_uint32_t i;
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rt_err_t ret = -RT_ERROR;
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struct pico_i2c_bus *pico_i2c = (struct pico_i2c_bus *)bus;
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for (i = 0; i < num; i++)
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{
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msg = &msgs[i];
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if (msg->flags & RT_I2C_RD)
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{
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i2c_read_blocking(pico_i2c->handle, msg->addr, msg->buf, msg->len, false);
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}
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else
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{
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i2c_write_blocking(pico_i2c->handle, msg->addr, msg->buf, msg->len, false);
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}
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}
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return ret;
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}
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static const struct rt_i2c_bus_device_ops i2c_ops =
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{
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.master_xfer = pico_i2c_xfer,
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.slave_xfer = RT_NULL,
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.i2c_bus_control = RT_NULL
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};
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int rt_hw_i2c_init(void)
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{
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int result = RT_EOK;
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for (rt_size_t i = 0; i < sizeof(pico_i2c_obj) / sizeof(struct pico_i2c_bus); i++)
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{
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i2c_init(pico_i2c_obj[i].handle, pico_i2c_obj[i].baud);
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gpio_set_function(pico_i2c_obj[i].i2c_sda_pin, GPIO_FUNC_I2C);
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gpio_set_function(pico_i2c_obj[i].i2c_scl_pin, GPIO_FUNC_I2C);
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gpio_pull_up(pico_i2c_obj[i].i2c_sda_pin);
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gpio_pull_up(pico_i2c_obj[i].i2c_scl_pin);
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// Make the I2C pins available to picotool
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bi_decl(bi_2pins_with_func(pico_i2c_obj[i].i2c_sda_pin, pico_i2c_obj[i].i2c_scl_pin, GPIO_FUNC_I2C));
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pico_i2c_obj[i].parent.ops = &i2c_ops;
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/* register i2c device */
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if (rt_i2c_bus_device_register(&pico_i2c_obj[i].parent, pico_i2c_obj[i].device_name) == RT_EOK)
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{
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LOG_D("%s init success", pico_i2c_obj[i].device_name);
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}
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else
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{
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LOG_E("%s register failed", pico_i2c_obj[i].device_name);
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result = -RT_ERROR;
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}
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}
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return result;
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}
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INIT_BOARD_EXPORT(rt_hw_i2c_init);
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#endif /* BSP_USING_I2C */
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