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+/*
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+ * Copyright (c) 2020-2021, Bluetrum 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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+ * 2021-01-07 greedyhao first version
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+ */
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+
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+#include <board.h>
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+#include "drv_soft_i2c.h"
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+
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+#ifdef RT_USING_I2C
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+
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+// #define DRV_DEBUG
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+#define LOG_TAG "drv.i2c"
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+#include <drv_log.h>
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+
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+#if !defined(BSP_USING_I2C1) && !defined(BSP_USING_I2C2) && !defined(BSP_USING_I2C3) && !defined(BSP_USING_I2C4)
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+#error "Please define at least one BSP_USING_I2Cx"
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+/* this driver can be disabled at menuconfig → RT-Thread Components → Device Drivers */
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+#endif
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+
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+static const struct ab32_soft_i2c_config soft_i2c_config[] =
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+{
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+#ifdef BSP_USING_I2C1
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+ I2C1_BUS_CONFIG,
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+#endif
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+#ifdef BSP_USING_I2C2
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+ I2C2_BUS_CONFIG,
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+#endif
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+#ifdef BSP_USING_I2C3
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+ I2C3_BUS_CONFIG,
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+#endif
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+#ifdef BSP_USING_I2C4
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+ I2C4_BUS_CONFIG,
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+#endif
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+};
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+
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+static struct ab32_i2c i2c_obj[sizeof(soft_i2c_config) / sizeof(soft_i2c_config[0])] = {0};
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+
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+/**
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+ * This function initializes the i2c pin.
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+ *
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+ * @param ab32 i2c dirver class.
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+ */
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+static void ab32_i2c_gpio_init(struct ab32_i2c *i2c)
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+{
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+ struct ab32_soft_i2c_config* cfg = (struct ab32_soft_i2c_config*)i2c->ops.data;
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+
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+ cfg->scl_mode = PIN_MODE_OUTPUT_OD;
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+ cfg->sda_mode = PIN_MODE_OUTPUT_OD;
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+ rt_pin_mode(cfg->scl, cfg->scl_mode);
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+ rt_pin_mode(cfg->sda, cfg->sda_mode);
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+
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+ rt_pin_write(cfg->scl, PIN_HIGH);
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+ rt_pin_write(cfg->sda, PIN_HIGH);
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+}
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+
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+/**
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+ * This function sets the sda pin.
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+ *
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+ * @param data ab32 config class.
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+ * @param state The sda pin state.
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+ */
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+static void ab32_set_sda(void *data, rt_int32_t state)
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+{
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+ struct ab32_soft_i2c_config* cfg = (struct ab32_soft_i2c_config*)data;
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+
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+ if (cfg->sda_mode == PIN_MODE_INPUT_PULLUP) {
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+ cfg->sda_mode = PIN_MODE_OUTPUT_OD;
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+ rt_pin_mode(cfg->sda, cfg->sda_mode);
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+ }
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+
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+ if (state)
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+ {
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+ rt_pin_write(cfg->sda, PIN_HIGH);
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+ }
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+ else
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+ {
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+ rt_pin_write(cfg->sda, PIN_LOW);
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+ }
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+}
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+
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+/**
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+ * This function sets the scl pin.
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+ *
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+ * @param data ab32 config class.
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+ * @param state The scl pin state.
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+ */
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+static void ab32_set_scl(void *data, rt_int32_t state)
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+{
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+ struct ab32_soft_i2c_config* cfg = (struct ab32_soft_i2c_config*)data;
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+
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+ if (cfg->scl_mode == PIN_MODE_INPUT_PULLUP) {
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+ cfg->scl_mode = PIN_MODE_OUTPUT_OD;
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+ rt_pin_mode(cfg->scl, cfg->scl_mode);
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+ }
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+
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+ if (state)
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+ {
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+ rt_pin_write(cfg->scl, PIN_HIGH);
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+ }
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+ else
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+ {
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+ rt_pin_write(cfg->scl, PIN_LOW);
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+ }
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+}
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+
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+/**
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+ * This function gets the sda pin state.
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+ *
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+ * @param data The sda pin state.
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+ */
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+static rt_int32_t ab32_get_sda(void *data)
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+{
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+ struct ab32_soft_i2c_config* cfg = (struct ab32_soft_i2c_config*)data;
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+
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+ if (cfg->sda_mode != PIN_MODE_INPUT_PULLUP) {
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+ cfg->sda_mode = PIN_MODE_INPUT_PULLUP;
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+ rt_pin_mode(cfg->sda, cfg->sda_mode);
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+ }
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+
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+ return rt_pin_read(cfg->sda);
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+}
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+
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+/**
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+ * This function gets the scl pin state.
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+ *
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+ * @param data The scl pin state.
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+ */
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+static rt_int32_t ab32_get_scl(void *data)
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+{
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+ struct ab32_soft_i2c_config* cfg = (struct ab32_soft_i2c_config*)data;
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+
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+ if (cfg->scl_mode == PIN_MODE_INPUT_PULLUP) {
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+ cfg->scl_mode = PIN_MODE_INPUT_PULLUP;
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+ rt_pin_mode(cfg->scl, cfg->scl_mode);
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+ }
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+
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+ return rt_pin_read(cfg->scl);
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+}
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+
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+/**
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+ * The time delay function.
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+ *
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+ * @param us microseconds.
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+ */
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+static void ab32_udelay(rt_uint32_t us)
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+{
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+ rt_uint32_t ticks;
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+ rt_uint32_t told, tnow, tcnt = 0;
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+ rt_uint32_t reload = TMR0PR;
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+
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+ ticks = us * reload / (1000 / RT_TICK_PER_SECOND);
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+ told = TMR0CNT;
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+ while (1)
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+ {
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+ tnow = TMR0CNT;
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+ if (tnow != told)
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+ {
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+ if (tnow < told)
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+ {
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+ tcnt += told - tnow;
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+ }
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+ else
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+ {
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+ tcnt += reload - tnow + told;
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+ }
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+ told = tnow;
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+ if (tcnt >= ticks)
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+ {
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+ break;
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+ }
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+ }
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+ }
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+}
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+
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+static const struct rt_i2c_bit_ops ab32_bit_ops_default =
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+{
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+ .data = RT_NULL,
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+ .set_sda = ab32_set_sda,
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+ .set_scl = ab32_set_scl,
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+ .get_sda = ab32_get_sda,
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+ .get_scl = ab32_get_scl,
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+ .udelay = ab32_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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+/**
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+ * if i2c is locked, this function will unlock it
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+ *
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+ * @param cfg ab32 config class
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+ *
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+ * @return RT_EOK indicates successful unlock.
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+ */
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+static rt_err_t ab32_i2c_bus_unlock(const struct ab32_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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+ while (i++ < 9)
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+ {
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+ rt_pin_write(cfg->scl, PIN_HIGH);
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+ ab32_udelay(100);
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+ rt_pin_write(cfg->scl, PIN_LOW);
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+ ab32_udelay(100);
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+ }
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+ }
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+ if (PIN_LOW == rt_pin_read(cfg->sda))
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+ {
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+ return -RT_ERROR;
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+ }
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+
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+ return RT_EOK;
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+}
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+
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+/* I2C initialization function */
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+int rt_hw_i2c_init(void)
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+{
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+ rt_size_t obj_num = sizeof(i2c_obj) / sizeof(struct ab32_i2c);
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+ rt_err_t result;
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+
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+ for (int i = 0; i < obj_num; i++)
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+ {
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+ i2c_obj[i].ops = ab32_bit_ops_default;
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+ i2c_obj[i].ops.data = (void*)&soft_i2c_config[i];
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+ i2c_obj[i].i2c2_bus.priv = &i2c_obj[i].ops;
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+ ab32_i2c_gpio_init(&i2c_obj[i]);
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+ result = rt_i2c_bit_add_bus(&i2c_obj[i].i2c2_bus, soft_i2c_config[i].bus_name);
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+ RT_ASSERT(result == RT_EOK);
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+ ab32_i2c_bus_unlock(&soft_i2c_config[i]);
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+
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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_BOARD_EXPORT(rt_hw_i2c_init);
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+
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+#endif
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