[add] 添加 软件IIC 驱动

bsp/ra6m4-cpk/.config

@@ -132,7 +132,10 @@ CONFIG_RT_SERIAL_USING_DMA=y
 # CONFIG_RT_USING_CAN is not set
 # CONFIG_RT_USING_HWTIMER is not set
 # CONFIG_RT_USING_CPUTIME is not set
-# CONFIG_RT_USING_I2C is not set
+CONFIG_RT_USING_I2C=y
+# CONFIG_RT_I2C_DEBUG is not set
+CONFIG_RT_USING_I2C_BITOPS=y
+# CONFIG_RT_I2C_BITOPS_DEBUG is not set
 # CONFIG_RT_USING_PHY is not set
 CONFIG_RT_USING_PIN=y
 # CONFIG_RT_USING_ADC is not set
@@ -580,6 +583,10 @@ CONFIG_BSP_USING_UART7=y
 # CONFIG_BSP_UART7_TX_USING_DMA is not set
 CONFIG_BSP_UART7_RX_BUFSIZE=256
 CONFIG_BSP_UART7_TX_BUFSIZE=0
+CONFIG_BSP_USING_I2C=y
+CONFIG_BSP_USING_I2C1=y
+CONFIG_BSP_I2C1_SCL_PIN=0x0512
+CONFIG_BSP_I2C1_SDA_PIN=0x0511
 
 #
 # Board extended module Drivers

bsp/ra6m4-cpk/drivers/Kconfig

@@ -51,7 +51,27 @@ menu "Hardware Drivers Config"
                     endif
             endif
 
-
+        menuconfig BSP_USING_I2C
+            bool "Enable I2C BUS"
+            default n
+            select RT_USING_I2C
+            select RT_USING_I2C_BITOPS
+            select RT_USING_PIN
+            if BSP_USING_I2C
+                menuconfig BSP_USING_I2C1
+                    bool "Enable I2C1 BUS (software simulation)"
+                    default y
+                    if BSP_USING_I2C1
+                        config BSP_I2C1_SCL_PIN
+                            int "i2c1 scl pin number"
+                            range 0x0000 0x0B0F
+                            default 0x0512
+                        config BSP_I2C1_SDA_PIN
+                            int "I2C1 sda pin number"
+                            range 0x0000 0x0B0F
+                            default 0x0511
+                    endif
+            endif
 
     endmenu
 

bsp/ra6m4-cpk/drivers/drv_soft_i2c.c

@@ -0,0 +1,218 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author            Notes
+ * 2021-07-29     KyleChan          first version
+ */
+
+#include "board.h"
+#include "drv_soft_i2c.h"
+#include "drv_config.h"
+
+#ifdef RT_USING_I2C
+
+#define DBG_TAG              "drv.i2c"
+#ifdef DRV_DEBUG
+#define DBG_LVL               DBG_LOG
+#else
+#define DBG_LVL               DBG_INFO
+#endif /* DRV_DEBUG */
+
+#if !defined(BSP_USING_I2C0) && !defined(BSP_USING_I2C1)
+#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 ra_soft_i2c_config soft_i2c_config[] =
+{
+#ifdef BSP_USING_I2C0
+    I2C0_BUS_CONFIG,
+#endif
+#ifdef BSP_USING_I2C1
+    I2C1_BUS_CONFIG,
+#endif
+};
+
+static struct ra_i2c i2c_obj[sizeof(soft_i2c_config) / sizeof(soft_i2c_config[0])];
+
+/**
+ * This function initializes the i2c pin.
+ *
+ * @param ra i2c dirver class.
+ */
+static void ra_i2c_gpio_init(struct ra_i2c *i2c)
+{
+    struct ra_soft_i2c_config* cfg = (struct ra_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 ra config class.
+ * @param The sda pin state.
+ */
+static void ra_set_sda(void *data, rt_int32_t state)
+{
+    struct ra_soft_i2c_config* cfg = (struct ra_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 ra config class.
+ * @param The scl pin state.
+ */
+static void ra_set_scl(void *data, rt_int32_t state)
+{
+    struct ra_soft_i2c_config* cfg = (struct ra_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 ra_get_sda(void *data)
+{
+    struct ra_soft_i2c_config* cfg = (struct ra_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 ra_get_scl(void *data)
+{
+    struct ra_soft_i2c_config* cfg = (struct ra_soft_i2c_config*)data;
+    return rt_pin_read(cfg->scl);
+}
+/**
+ * The time delay function.
+ *
+ * @param microseconds.
+ */
+static void ra_udelay(rt_uint32_t us)
+{
+    rt_uint32_t ticks;
+    rt_uint32_t told, tnow, tcnt = 0;
+    rt_uint32_t reload = SysTick->LOAD;
+
+    ticks = us * reload / (1000000 / RT_TICK_PER_SECOND);
+    told = SysTick->VAL;
+    while (1)
+    {
+        tnow = SysTick->VAL;
+        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 ra_bit_ops_default =
+{
+    .data     = RT_NULL,
+    .set_sda  = ra_set_sda,
+    .set_scl  = ra_set_scl,
+    .get_sda  = ra_get_sda,
+    .get_scl  = ra_get_scl,
+    .udelay   = ra_udelay,
+    .delay_us = 1,
+    .timeout  = 100
+};
+
+/**
+ * if i2c is locked, this function will unlock it
+ *
+ * @param ra config class
+ *
+ * @return RT_EOK indicates successful unlock.
+ */
+static rt_err_t ra_i2c_bus_unlock(const struct ra_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);
+            ra_udelay(100);
+            rt_pin_write(cfg->scl, PIN_LOW);
+            ra_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 ra_i2c);
+    rt_err_t result;
+
+    for (int i = 0; i < obj_num; i++)
+    {
+        i2c_obj[i].ops = ra_bit_ops_default;
+        i2c_obj[i].ops.data = (void*)&soft_i2c_config[i];
+        i2c_obj[i].i2c2_bus.priv = &i2c_obj[i].ops;
+        ra_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);
+        ra_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/ra6m4-cpk/drivers/drv_soft_i2c.h

@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author            Notes
+ * 2021-07-29     KyleChan          first version
+ */
+
+#ifndef __DRV_I2C__
+#define __DRV_I2C__
+
+#include <rtthread.h>
+#include <rthw.h>
+#include <rtdevice.h>
+#include <rtdbg.h>
+
+/* ra config class */
+struct ra_soft_i2c_config
+{
+    rt_uint32_t scl;
+    rt_uint32_t sda;
+    const char *bus_name;
+};
+/* ra i2c dirver class */
+struct ra_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
+
+int rt_hw_i2c_init(void);
+
+#endif