[bsp][bl] add drv_soft_i2c (#7406)

bsp/bouffalo_lab/libraries/rt_drivers/Kconfig

@@ -174,6 +174,56 @@ menu "General Drivers Configuration"
     config BSP_USING_ON_CHIP_FLASH
         bool "Enable on-chip FLASH"
         default n
-    
+    menu "General Purpose I2C"
+
+    menuconfig BSP_USING_I2C1
+        bool "Enable I2C1"
+        default n
+        select BSP_USING_I2C
+        select RT_USING_I2C
+        select RT_USING_I2C_BITOPS
+        select RT_USING_PIN
+        if BSP_USING_I2C1
+            choice
+                prompt "I2C1 SCL PIN"
+                default I2C1_SCL_USING_GPIO4 if BSP_USING_BL60X
+                default I2C1_SCL_USING_GPIO10 if BSP_USING_BL61X
+                default I2C1_SCL_USING_GPIO08 if BSP_USING_BL70X
+                default I2C1_SCL_USING_GPIO20 if BSP_USING_BL808
+
+                config I2C1_SCL_USING_GPIO0
+                    bool "GPIO_0"
+                config I2C1_SCL_USING_GPIO4
+                    bool "GPIO_4"
+                config I2C1_SCL_USING_GPIO8
+                    bool "GPIO_8"
+                config I2C1_SCL_USING_GPIO10
+                    bool "GPIO_10"
+                config I2C1_SCL_USING_GPIO20
+                    bool "GPIO_20"
+
+            endchoice
+            choice
+                prompt "I2C1 SDA PIN"
+                default I2C1_SDA_USING_GPIO3 if BSP_USING_BL60X
+                default I2C1_SDA_USING_GPIO11 if BSP_USING_BL61X
+                default I2C1_SDA_USING_GPIO7 if BSP_USING_BL70X
+                default I2C1_SDA_USING_GPIO21 if BSP_USING_BL808
+
+                config I2C1_SDA_USING_GPIO1
+                    bool "GPIO_1"
+                config I2C1_SDA_USING_GPIO3
+                    bool "GPIO_3"
+                config I2C1_SDA_USING_GPIO7
+                    bool "GPIO_7"
+                config I2C1_SDA_USING_GPIO11
+                    bool "GPIO_11"
+                config I2C1_SDA_USING_GPIO21
+                    bool "GPIO_21"
+
+            endchoice
+        endif
+    endmenu
+
 endmenu
 

bsp/bouffalo_lab/libraries/rt_drivers/SConscript

@@ -9,8 +9,8 @@ CPPPATH = [cwd]
 if GetDepend('BSP_USING_GPIO'):
     src += ['drv_gpio.c']
 
-if  GetDepend('BSP_USING_I2C'):
-    src += ['drv_i2c.c']
+if  GetDepend('RT_USING_I2C'):
+    src += ['drv_soft_i2c.c']
 
 if  GetDepend('BSP_USING_ADC'):
     src += ['drv_adc.c']

bsp/bouffalo_lab/libraries/rt_drivers/drv_soft_i2c.c

@@ -0,0 +1,211 @@
+/*
+ * Copyright (c) 2006-2023, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2023/04/15     chushicheng  first version
+ */
+
+#include "drv_soft_i2c.h"
+#include "bflb_gpio.h"
+#include "bflb_common.h"
+
+#ifdef RT_USING_I2C
+#define DBG_LEVEL   DBG_LOG
+#include <rtdbg.h>
+#define LOG_TAG "DRV.I2C"
+
+#if !defined(BSP_USING_I2C1) && !defined(BSP_USING_I2C2)
+#error "Please define at least one BSP_USING_I2Cx"
+/* this driver can be disabled at menuconfig -> RT-Thread Components -> Device Drivers */
+#endif
+
+// uart1
+#ifdef I2C1_SCL_USING_GPIO0
+#define BSP_I2C1_SCL_PIN           GPIO_PIN_0
+#elif defined(I2C1_SCL_USING_GPIO4)
+#define BSP_I2C1_SCL_PIN           GPIO_PIN_4
+#elif defined(I2C1_SCL_USING_GPIO8)
+#define BSP_I2C1_SCL_PIN           GPIO_PIN_8
+#elif defined(I2C1_SCL_USING_GPIO10)
+#define BSP_I2C1_SCL_PIN           GPIO_PIN_10
+#elif defined(I2C1_SCL_USING_GPIO20)
+#define BSP_I2C1_SCL_PIN           GPIO_PIN_20
+#endif
+
+#ifdef I2C1_SDA_USING_GPIO1
+#define BSP_I2C1_SDA_PIN           GPIO_PIN_1
+#elif defined(I2C1_SDA_USING_GPIO3)
+#define BSP_I2C1_SDA_PIN           GPIO_PIN_3
+#elif defined(I2C1_SDA_USING_GPIO7)
+#define BSP_I2C1_SDA_PIN           GPIO_PIN_7
+#elif defined(I2C1_SDA_USING_GPIO11)
+#define BSP_I2C1_SDA_PIN           GPIO_PIN_11
+#elif defined(I2C1_SDA_USING_GPIO21)
+#define BSP_I2C1_SDA_PIN           GPIO_PIN_21
+#endif
+
+static const struct bl_soft_i2c_config soft_i2c_config[] =
+{
+#ifdef BSP_USING_I2C1
+    I2C1_BUS_CONFIG,
+#endif
+};
+
+static struct bl_i2c i2c_obj[sizeof(soft_i2c_config) / sizeof(soft_i2c_config[0])];
+
+/**
+ * This function initializes the i2c pin.
+ *
+ * @param bl i2c dirver class.
+ */
+static void bl_i2c_gpio_init(struct bl_i2c *i2c)
+{
+    struct bl_soft_i2c_config* cfg = (struct bl_soft_i2c_config*)i2c->ops.data;
+
+    rt_pin_mode(cfg->scl, PIN_MODE_OUTPUT_OD);
+    rt_pin_mode(cfg->sda, PIN_MODE_OUTPUT_OD);
+
+    rt_pin_write(cfg->scl, PIN_HIGH);
+    rt_pin_write(cfg->sda, PIN_HIGH);
+}
+
+/**
+ * This function sets the sda pin.
+ *
+ * @param bl config class.
+ * @param The sda pin state.
+ */
+static void bl_set_sda(void *data, rt_int32_t state)
+{
+    struct bl_soft_i2c_config* cfg = (struct bl_soft_i2c_config*)data;
+    if (state)
+    {
+        rt_pin_write(cfg->sda, PIN_HIGH);
+    }
+    else
+    {
+        rt_pin_write(cfg->sda, PIN_LOW);
+    }
+}
+
+/**
+ * This function sets the scl pin.
+ *
+ * @param bl config class.
+ * @param The scl pin state.
+ */
+static void bl_set_scl(void *data, rt_int32_t state)
+{
+    struct bl_soft_i2c_config* cfg = (struct bl_soft_i2c_config*)data;
+    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 The sda pin state.
+ */
+static rt_int32_t bl_get_sda(void *data)
+{
+    struct bl_soft_i2c_config* cfg = (struct bl_soft_i2c_config*)data;
+    return rt_pin_read(cfg->sda);
+}
+
+/**
+ * This function gets the scl pin state.
+ *
+ * @param The scl pin state.
+ */
+static rt_int32_t bl_get_scl(void *data)
+{
+    struct bl_soft_i2c_config* cfg = (struct bl_soft_i2c_config*)data;
+    return rt_pin_read(cfg->scl);
+}
+
+/**
+ * The time delay function.
+ *
+ * @param microseconds.
+ */
+static void bl_udelay(rt_uint32_t us)
+{
+    arch_delay_us(us);
+}
+
+static const struct rt_i2c_bit_ops bl_bit_ops_default =
+{
+    .data     = RT_NULL,
+    .set_sda  = bl_set_sda,
+    .set_scl  = bl_set_scl,
+    .get_sda  = bl_get_sda,
+    .get_scl  = bl_get_scl,
+    .udelay   = bl_udelay,
+    .delay_us = 1,
+    .timeout  = 100
+};
+
+/**
+ * if i2c is locked, this function will unlock it
+ *
+ * @param bl config class
+ *
+ * @return RT_EOK indicates successful unlock.
+ */
+static rt_err_t bl_i2c_bus_unlock(const struct bl_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);
+            bl_udelay(100);
+            rt_pin_write(cfg->scl, PIN_LOW);
+            bl_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_err_t result;
+
+    for (rt_size_t i = 0; i < sizeof(i2c_obj) / sizeof(struct bl_i2c); i++)
+    {
+        i2c_obj[i].ops = bl_bit_ops_default;
+        i2c_obj[i].ops.data = (void*)&soft_i2c_config[i];
+        i2c_obj[i].i2c2_bus.priv = &i2c_obj[i].ops;
+        bl_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);
+        bl_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 /* RT_USING_I2C */

bsp/bouffalo_lab/libraries/rt_drivers/drv_soft_i2c.h

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2006-2023, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2023/04/15     chushicheng  first version
+ */
+
+#ifndef __DRV_I2C__
+#define __DRV_I2C__
+
+#include <rtthread.h>
+#include <rthw.h>
+#include <rtdevice.h>
+
+/* bl i2c dirver class */
+struct bl_i2c
+{
+    struct rt_i2c_bit_ops ops;
+    struct rt_i2c_bus_device i2c2_bus;
+};
+
+/* bl config class */
+struct bl_soft_i2c_config
+{
+    rt_uint8_t scl;
+    rt_uint8_t sda;
+    const char *bus_name;
+};
+
+#ifdef BSP_USING_I2C1
+#define I2C1_BUS_CONFIG                                  \
+    {                                                    \
+        .scl = BSP_I2C1_SCL_PIN,                         \
+        .sda = BSP_I2C1_SDA_PIN,                         \
+        .bus_name = "i2c1",                              \
+    }
+#endif
+
+int rt_hw_i2c_init(void);
+
+#endif