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@@ -0,0 +1,199 @@
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+/*
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+ * Copyright (c) 2006-2024 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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+ * 2024-12-07 wumingzi first version
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+ */
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+#include <rtthread.h>
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+#include <rtdevice.h>
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+#define LOG_TAG "drv.i2c"
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+#ifdef RT_USING_I2C
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+#ifdef BSP_USING_SW_I2C
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+#include "rthw.h"
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+#include "rttypes.h"
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+#include <rtdbg.h>
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+#include "driver/gpio.h"
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+#include "drv_sw_i2c.h"
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+
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+#if defined(BSP_USING_SW_I2C0)
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+#define SW_I2C0_BUS_CONFIG \
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+ { \
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+ .scl = BSP_SW_I2C0_SCL_PIN, \
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+ .sda = BSP_SW_I2C0_SDA_PIN, \
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+ .bus_name = "i2c0", \
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+ }
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+#endif
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+
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+static const struct esp32c3_soft_i2c_config soft_i2c_config[] =
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+{
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+#if defined(BSP_USING_SW_I2C0)
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+ SW_I2C0_BUS_CONFIG,
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+#endif
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+};
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+
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+static struct esp32c3_i2c i2c_obj[sizeof(soft_i2c_config) / sizeof(soft_i2c_config[0])];
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+
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+/**
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+ * @brief This function initializes the i2c pin.
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+ * @param i2c
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+ * @retval None
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+ */
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+static void esp32c3_i2c_gpio_init(struct esp32c3_i2c *i2c)
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+{
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+ struct esp32c3_soft_i2c_config* cfg = (struct esp32c3_soft_i2c_config*)i2c->ops.data;
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+ rt_pin_mode(cfg->scl, PIN_MODE_OUTPUT_OD);
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+ rt_pin_mode(cfg->sda, PIN_MODE_OUTPUT_OD);
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+
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+ gpio_set_pull_mode(cfg->sda, GPIO_FLOATING);
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+ gpio_set_pull_mode(cfg->scl, GPIO_FLOATING);
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+
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+ gpio_set_level(cfg->scl, PIN_HIGH);
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+ gpio_set_level(cfg->sda, PIN_HIGH);
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+}
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+
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+/**
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+ * @brief This function sets the sda pin.
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+ * @param data, state
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+ * @retval None
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+ */
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+static void esp32c3_set_sda(void *data, rt_int32_t state)
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+{
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+ struct esp32c3_soft_i2c_config* cfg = (struct esp32c3_soft_i2c_config*)data;
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+ /*rt_pin_mode(cfg->sda, PIN_MODE_OUTPUT_OD);*/
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+ if (state)
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+ {
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+ gpio_set_level(cfg->sda, PIN_HIGH);
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+ }
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+ else
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+ {
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+ gpio_set_level(cfg->sda, PIN_LOW);
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+ }
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+}
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+
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+/**
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+ * @brief This function sets the scl pin.
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+ * @param data, state
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+ * @retval None
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+ */
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+static void esp32c3_set_scl(void *data, rt_int32_t state)
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+{
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+ struct esp32c3_soft_i2c_config* cfg = (struct esp32c3_soft_i2c_config*)data;
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+ if (state)
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+ {
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+ gpio_set_level(cfg->scl, PIN_HIGH);
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+ }
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+ else
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+ {
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+ gpio_set_level(cfg->scl, PIN_LOW);
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+ }
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+}
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+
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+/**
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+ * @brief This function gets the sda pin state.
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+ * @param data
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+ * @retval None
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+ */
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+static rt_int32_t esp32c3_get_sda(void *data)
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+{
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+ struct esp32c3_soft_i2c_config* cfg = (struct esp32c3_soft_i2c_config*)data;
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+ return gpio_get_level(cfg->sda);
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+}
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+
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+/**
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+ * @brief This function gets the scl pin state.
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+ * @param data
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+ * @retval None
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+ */
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+static rt_int32_t esp32c3_get_scl(void *data)
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+{
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+ struct esp32c3_soft_i2c_config* cfg = (struct esp32c3_soft_i2c_config*)data;
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+ return gpio_get_level(cfg->scl);
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+}
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+
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+/**
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+ * @brief The time delay function.
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+ * @param us
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+ * @retval None
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+ */
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+static void esp32c3_udelay(rt_uint32_t us)
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+{
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+ rt_hw_us_delay(us);
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+}
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+
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+/*
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+ * if i2c is locked, this function will unlock it
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+ *
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+ * @param esp32 config class
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+ *
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+ * @return RT_EOK indicates successful unlock.
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+ */
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+/* */
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+static rt_err_t esp32c3_i2c_bus_unlock(const struct esp32c3_soft_i2c_config *cfg)
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+{
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+ rt_int32_t i = 0;
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+
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+ if (PIN_LOW == rt_pin_read(cfg->sda))
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+ {
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+ /* 输出9个时钟 解锁IIC死锁 */
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+ while (i++ < 9)
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+ {
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+ gpio_set_level(cfg->scl, PIN_HIGH);
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+ esp32c3_udelay(100);
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+ gpio_set_level(cfg->scl, PIN_LOW);
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+ esp32c3_udelay(100);
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+ }
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+ }
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+ if (PIN_LOW == gpio_get_level(cfg->sda))
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+ {
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+ return -RT_ERROR;
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+ }
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+ return RT_EOK;
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+}
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+
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+static const struct rt_i2c_bit_ops esp32c3_bit_ops_default =
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+{
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+ .data = RT_NULL,
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+ .set_sda = esp32c3_set_sda,
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+ .set_scl = esp32c3_set_scl,
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+ .get_sda = esp32c3_get_sda,
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+ .get_scl = esp32c3_get_scl,
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+ .udelay = esp32c3_udelay,
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+ .delay_us = 1,
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+ .timeout = 100
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+};
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+
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+int rt_sw_i2c_init(void)
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+{
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+ /* I2C设备数量 */
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+ rt_size_t obj_num = sizeof(i2c_obj) / sizeof(struct esp32c3_i2c);
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+ rt_err_t result;
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+ /* 循环初始化 */
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+ for (int i = 0; i < obj_num; i++)
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+ {
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+ /* 注册方法 */
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+ i2c_obj[i].ops = esp32c3_bit_ops_default;
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+ /* 设备硬件数据 */
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+ i2c_obj[i].ops.data = (void*)&soft_i2c_config[i];
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+ /* 保存设备方法 */
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+ i2c_obj[i].i2c_bus.priv = &i2c_obj[i].ops;
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+
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+ esp32c3_i2c_gpio_init(&i2c_obj[i]);
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+ result = rt_i2c_bit_add_bus(&i2c_obj[i].i2c_bus, soft_i2c_config[i].bus_name);
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+ RT_ASSERT(result == RT_EOK);
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+
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+ esp32c3_i2c_bus_unlock(&soft_i2c_config[i]);
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+ LOG_D("software simulation %s init done, pin scl: %d, pin sda %d",
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+ soft_i2c_config[i].bus_name,
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+ soft_i2c_config[i].scl,
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+ soft_i2c_config[i].sda);
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+ }
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+
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+ return RT_EOK;
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+}
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+INIT_APP_EXPORT(rt_sw_i2c_init);
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+
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+#endif /* BSP_USING_SW_I2C */
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+#endif /* RT_USING_I2C */
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wumingzi