[bsp][bluetrum] add i2c support

bsp/bluetrum/libraries/hal_drivers/SConscript

@@ -16,6 +16,8 @@ if GetDepend('RT_USING_SERIAL'):
 if GetDepend('RT_USING_SDIO'):
     src += ['drv_sdio.c']
 
+if GetDepend('RT_USING_I2C'):
+    src += ['drv_soft_i2c.c']
 group = DefineGroup('Drivers', src, depend = [''], CPPPATH = path)
 
 objs = [group]

bsp/bluetrum/libraries/hal_drivers/drv_soft_i2c.c

@@ -0,0 +1,247 @@
+/*
+ * Copyright (c) 2020-2021, Bluetrum Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author            Notes
+ * 2021-01-07     greedyhao         first version
+ */
+
+#include <board.h>
+#include "drv_soft_i2c.h"
+
+#ifdef RT_USING_I2C
+
+// #define DRV_DEBUG
+#define LOG_TAG              "drv.i2c"
+#include <drv_log.h>
+
+#if !defined(BSP_USING_I2C1) && !defined(BSP_USING_I2C2) && !defined(BSP_USING_I2C3) && !defined(BSP_USING_I2C4)
+#error "Please define at least one BSP_USING_I2Cx"
+/* this driver can be disabled at menuconfig → RT-Thread Components → Device Drivers */
+#endif
+
+static const struct ab32_soft_i2c_config soft_i2c_config[] =
+{
+#ifdef BSP_USING_I2C1
+    I2C1_BUS_CONFIG,
+#endif
+#ifdef BSP_USING_I2C2
+    I2C2_BUS_CONFIG,
+#endif
+#ifdef BSP_USING_I2C3
+    I2C3_BUS_CONFIG,
+#endif
+#ifdef BSP_USING_I2C4
+    I2C4_BUS_CONFIG,
+#endif
+};
+
+static struct ab32_i2c i2c_obj[sizeof(soft_i2c_config) / sizeof(soft_i2c_config[0])] = {0};
+
+/**
+ * This function initializes the i2c pin.
+ *
+ * @param ab32 i2c dirver class.
+ */
+static void ab32_i2c_gpio_init(struct ab32_i2c *i2c)
+{
+    struct ab32_soft_i2c_config* cfg = (struct ab32_soft_i2c_config*)i2c->ops.data;
+
+    cfg->scl_mode = PIN_MODE_OUTPUT_OD;
+    cfg->sda_mode = PIN_MODE_OUTPUT_OD;
+    rt_pin_mode(cfg->scl, cfg->scl_mode);
+    rt_pin_mode(cfg->sda, cfg->sda_mode);
+
+    rt_pin_write(cfg->scl, PIN_HIGH);
+    rt_pin_write(cfg->sda, PIN_HIGH);
+}
+
+/**
+ * This function sets the sda pin.
+ *
+ * @param data ab32 config class.
+ * @param state The sda pin state.
+ */
+static void ab32_set_sda(void *data, rt_int32_t state)
+{
+    struct ab32_soft_i2c_config* cfg = (struct ab32_soft_i2c_config*)data;
+
+    if (cfg->sda_mode == PIN_MODE_INPUT_PULLUP) {
+        cfg->sda_mode = PIN_MODE_OUTPUT_OD;
+        rt_pin_mode(cfg->sda, cfg->sda_mode);
+    }
+
+    if (state)
+    {
+        rt_pin_write(cfg->sda, PIN_HIGH);
+    }
+    else
+    {
+        rt_pin_write(cfg->sda, PIN_LOW);
+    }
+}
+
+/**
+ * This function sets the scl pin.
+ *
+ * @param data ab32 config class.
+ * @param state The scl pin state.
+ */
+static void ab32_set_scl(void *data, rt_int32_t state)
+{
+    struct ab32_soft_i2c_config* cfg = (struct ab32_soft_i2c_config*)data;
+
+    if (cfg->scl_mode == PIN_MODE_INPUT_PULLUP) {
+        cfg->scl_mode = PIN_MODE_OUTPUT_OD;
+        rt_pin_mode(cfg->scl, cfg->scl_mode);
+    }
+
+    if (state)
+    {
+        rt_pin_write(cfg->scl, PIN_HIGH);
+    }
+    else
+    {
+        rt_pin_write(cfg->scl, PIN_LOW);
+    }
+}
+
+/**
+ * This function gets the sda pin state.
+ *
+ * @param data The sda pin state.
+ */
+static rt_int32_t ab32_get_sda(void *data)
+{
+    struct ab32_soft_i2c_config* cfg = (struct ab32_soft_i2c_config*)data;
+
+    if (cfg->sda_mode != PIN_MODE_INPUT_PULLUP) {
+        cfg->sda_mode = PIN_MODE_INPUT_PULLUP;
+        rt_pin_mode(cfg->sda, cfg->sda_mode);
+    }
+
+    return rt_pin_read(cfg->sda);
+}
+
+/**
+ * This function gets the scl pin state.
+ *
+ * @param data The scl pin state.
+ */
+static rt_int32_t ab32_get_scl(void *data)
+{
+    struct ab32_soft_i2c_config* cfg = (struct ab32_soft_i2c_config*)data;
+
+    if (cfg->scl_mode == PIN_MODE_INPUT_PULLUP) {
+        cfg->scl_mode = PIN_MODE_INPUT_PULLUP;
+        rt_pin_mode(cfg->scl, cfg->scl_mode);
+    }
+
+    return rt_pin_read(cfg->scl);
+}
+
+/**
+ * The time delay function.
+ *
+ * @param us microseconds.
+ */
+static void ab32_udelay(rt_uint32_t us)
+{
+    rt_uint32_t ticks;
+    rt_uint32_t told, tnow, tcnt = 0;
+    rt_uint32_t reload = TMR0PR;
+
+    ticks = us * reload / (1000 / RT_TICK_PER_SECOND);
+    told = TMR0CNT;
+    while (1)
+    {
+        tnow = TMR0CNT;
+        if (tnow != told)
+        {
+            if (tnow < told)
+            {
+                tcnt += told - tnow;
+            }
+            else
+            {
+                tcnt += reload - tnow + told;
+            }
+            told = tnow;
+            if (tcnt >= ticks)
+            {
+                break;
+            }
+        }
+    }
+}
+
+static const struct rt_i2c_bit_ops ab32_bit_ops_default =
+{
+    .data     = RT_NULL,
+    .set_sda  = ab32_set_sda,
+    .set_scl  = ab32_set_scl,
+    .get_sda  = ab32_get_sda,
+    .get_scl  = ab32_get_scl,
+    .udelay   = ab32_udelay,
+    .delay_us = 1,
+    .timeout  = 100
+};
+
+/**
+ * if i2c is locked, this function will unlock it
+ *
+ * @param cfg ab32 config class
+ *
+ * @return RT_EOK indicates successful unlock.
+ */
+static rt_err_t ab32_i2c_bus_unlock(const struct ab32_soft_i2c_config *cfg)
+{
+    rt_int32_t i = 0;
+
+    if (PIN_LOW == rt_pin_read(cfg->sda))
+    {
+        while (i++ < 9)
+        {
+            rt_pin_write(cfg->scl, PIN_HIGH);
+            ab32_udelay(100);
+            rt_pin_write(cfg->scl, PIN_LOW);
+            ab32_udelay(100);
+        }
+    }
+    if (PIN_LOW == rt_pin_read(cfg->sda))
+    {
+        return -RT_ERROR;
+    }
+
+    return RT_EOK;
+}
+
+/* I2C initialization function */
+int rt_hw_i2c_init(void)
+{
+    rt_size_t obj_num = sizeof(i2c_obj) / sizeof(struct ab32_i2c);
+    rt_err_t result;
+
+    for (int i = 0; i < obj_num; i++)
+    {
+        i2c_obj[i].ops = ab32_bit_ops_default;
+        i2c_obj[i].ops.data = (void*)&soft_i2c_config[i];
+        i2c_obj[i].i2c2_bus.priv = &i2c_obj[i].ops;
+        ab32_i2c_gpio_init(&i2c_obj[i]);
+        result = rt_i2c_bit_add_bus(&i2c_obj[i].i2c2_bus, soft_i2c_config[i].bus_name);
+        RT_ASSERT(result == RT_EOK);
+        ab32_i2c_bus_unlock(&soft_i2c_config[i]);
+
+        LOG_D("software simulation %s init done, pin scl: %d, pin sda %d",
+        soft_i2c_config[i].bus_name, 
+        soft_i2c_config[i].scl, 
+        soft_i2c_config[i].sda);
+    }
+
+    return RT_EOK;
+}
+INIT_BOARD_EXPORT(rt_hw_i2c_init);
+
+#endif

bsp/bluetrum/libraries/hal_drivers/drv_soft_i2c.h

@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2020-2021, Bluetrum Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author            Notes
+ * 2021-01-07     greedyhao         first version
+ */
+
+#ifndef __DRV_I2C__
+#define __DRV_I2C__
+
+#include <rtthread.h>
+#include <rthw.h>
+#include <rtdevice.h>
+
+/* ab32 config class */
+struct ab32_soft_i2c_config
+{
+    rt_uint8_t scl;
+    rt_uint8_t sda;
+    rt_uint8_t sda_mode;
+    rt_uint8_t scl_mode;
+    const char *bus_name;
+};
+
+/* ab32 i2c dirver class */
+struct ab32_i2c
+{
+    struct rt_i2c_bit_ops ops;
+    struct rt_i2c_bus_device i2c2_bus;
+};
+
+#ifdef BSP_USING_I2C1
+#define I2C1_BUS_CONFIG                                  \
+    {                                                    \
+        .scl = BSP_I2C1_SCL_PIN,                         \
+        .sda = BSP_I2C1_SDA_PIN,                         \
+        .bus_name = "i2c1",                              \
+    }
+#endif
+
+#ifdef BSP_USING_I2C2
+#define I2C2_BUS_CONFIG                                  \
+    {                                                    \
+        .scl = BSP_I2C2_SCL_PIN,                         \
+        .sda = BSP_I2C2_SDA_PIN,                         \
+        .bus_name = "i2c2",                              \
+    }
+#endif
+
+#ifdef BSP_USING_I2C3
+#define I2C3_BUS_CONFIG                                  \
+    {                                                    \
+        .scl = BSP_I2C3_SCL_PIN,                         \
+        .sda = BSP_I2C3_SDA_PIN,                         \
+        .bus_name = "i2c3",                              \
+    }
+#endif
+
+#ifdef BSP_USING_I2C4
+#define I2C4_BUS_CONFIG                                  \
+    {                                                    \
+        .scl = BSP_I2C4_SCL_PIN,                         \
+        .sda = BSP_I2C4_SDA_PIN,                         \
+        .bus_name = "i2c4",                              \
+    }
+#endif
+int rt_hw_i2c_init(void);
+
+#endif