[bsp][pico]add: drv_soft_i2c

bsp/raspberry-pico/drivers/drv_soft_i2c.c

@@ -0,0 +1,177 @@
+/*
+ * Copyright (c) 2006-2023, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2023/06/01     chushicheng  first version
+ */
+#include "drv_soft_i2c.h"
+
+#ifdef BSP_USING_SOFT_I2C
+#define DBG_LEVEL   DBG_LOG
+#include <rtdbg.h>
+#define LOG_TAG "DRV.I2C"
+
+static const struct pico_soft_i2c_config soft_i2c_config[] =
+{
+#ifdef BSP_USING_SOFT_I2C1
+    I2C1_BUS_CONFIG,
+#endif
+};
+
+static struct pico_i2c i2c_obj[sizeof(soft_i2c_config) / sizeof(soft_i2c_config[0])];
+
+/**
+ * This function initializes the i2c pin.
+ *
+ * @param pico i2c dirver class.
+ */
+static void pico_i2c_gpio_init(struct pico_i2c *i2c)
+{
+    struct pico_soft_i2c_config* cfg = (struct pico_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 pico config class.
+ * @param The sda pin state.
+ */
+static void pico_set_sda(void *data, rt_int32_t state)
+{
+    struct pico_soft_i2c_config* cfg = (struct pico_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 pico config class.
+ * @param The scl pin state.
+ */
+static void pico_set_scl(void *data, rt_int32_t state)
+{
+    struct pico_soft_i2c_config* cfg = (struct pico_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 pico_get_sda(void *data)
+{
+    struct pico_soft_i2c_config* cfg = (struct pico_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 pico_get_scl(void *data)
+{
+    struct pico_soft_i2c_config* cfg = (struct pico_soft_i2c_config*)data;
+    return rt_pin_read(cfg->scl);
+}
+
+/**
+ * The time delay function.
+ *
+ * @param microseconds.
+ */
+static void pico_udelay(rt_uint32_t us)
+{
+    busy_wait_us_32(us);
+}
+
+static const struct rt_i2c_bit_ops pico_bit_ops_default =
+{
+    .data     = RT_NULL,
+    .set_sda  = pico_set_sda,
+    .set_scl  = pico_set_scl,
+    .get_sda  = pico_get_sda,
+    .get_scl  = pico_get_scl,
+    .udelay   = pico_udelay,
+    .delay_us = 1,
+    .timeout  = 100
+};
+
+/**
+ * if i2c is locked, this function will unlock it
+ *
+ * @param pico config class
+ *
+ * @return RT_EOK indicates successful unlock.
+ */
+static rt_err_t pico_i2c_bus_unlock(const struct pico_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);
+            pico_udelay(100);
+            rt_pin_write(cfg->scl, PIN_LOW);
+            pico_udelay(100);
+        }
+    }
+    if (PIN_LOW == rt_pin_read(cfg->sda))
+    {
+        return -RT_ERROR;
+    }
+
+    return RT_EOK;
+}
+
+/* I2C initialization function */
+int rt_soft_i2c_init(void)
+{
+    rt_err_t result;
+
+    for (rt_size_t i = 0; i < sizeof(i2c_obj) / sizeof(struct pico_i2c); i++)
+    {
+        i2c_obj[i].ops = pico_bit_ops_default;
+        i2c_obj[i].ops.data = (void*)&soft_i2c_config[i];
+        i2c_obj[i].i2c2_bus.priv = &i2c_obj[i].ops;
+        pico_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);
+        pico_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_DEVICE_EXPORT(rt_soft_i2c_init);
+
+#endif /* BSP_USING_SOFT_I2C */

bsp/raspberry-pico/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
+ * 2023/06/01     chushicheng  first version
+ */
+
+#ifndef __DRV_I2C__
+#define __DRV_I2C__
+
+#include <rtdevice.h>
+#include "drv_gpio.h"
+#include "board.h"
+
+/* pico i2c dirver class */
+struct pico_i2c
+{
+    struct rt_i2c_bit_ops ops;
+    struct rt_i2c_bus_device i2c2_bus;
+};
+
+/* pico config class */
+struct pico_soft_i2c_config
+{
+    rt_uint8_t scl;
+    rt_uint8_t sda;
+    const char *bus_name;
+};
+
+#ifdef BSP_USING_SOFT_I2C1
+#define I2C1_BUS_CONFIG                                  \
+    {                                                    \
+        .scl = BSP_SOFT_I2C1_SCL_PIN,                    \
+        .sda = BSP_SOFT_I2C1_SDA_PIN,                    \
+        .bus_name = "i2c1",                              \
+    }
+#endif
+
+int rt_soft_i2c_init(void);
+
+#endif

bsp/raspberry-pico/libraries/Kconfig

@@ -22,4 +22,29 @@ menu "Onboard Peripheral Drivers"
     endif
 endmenu
 
+menu "On-chip Peripheral Drivers"
+
+    menuconfig BSP_USING_SOFT_I2C
+        bool "Enable I2C BUS (software simulation)"
+        default n
+        select RT_USING_I2C
+        select RT_USING_I2C_BITOPS
+        select RT_USING_PIN
+        if BSP_USING_SOFT_I2C
+            config BSP_USING_SOFT_I2C1
+                bool "Enable I2C1 Bus (software simulation)"
+                default n
+                if BSP_USING_SOFT_I2C1
+                    config BSP_SOFT_I2C1_SCL_PIN
+                        int "i2c1 scl pin number (GP)"
+                        range 0 28
+                        default 2
+                    config BSP_SOFT_I2C1_SDA_PIN
+                        int "I2C1 sda pin number (GP)"
+                        range 0 28
+                        default 3
+                endif
+        endif
+endmenu
+
 endmenu