[bsp][cvitek]: add c906_little i2c driver (#8535)

bsp/cvitek/c906_little/board/Kconfig

@@ -19,4 +19,24 @@ menu "General Drivers Configuration"
             default 30
         endif
 
+    menuconfig BSP_USING_I2C
+        bool "Using HW I2C"
+        select RT_USING_I2C
+        select RT_USING_I2C_BITOPS
+        select RT_USING_PIN
+        default n
+
+        if BSP_USING_I2C
+            config BSP_USING_I2C0
+                bool "Enable I2C0"
+                default n
+
+            config BSP_USING_I2C1
+                bool "Enable I2C1"
+                default n
+
+            config I2C_IRQ_BASE
+            int
+            default 32
+        endif
 endmenu

bsp/cvitek/c906_little/board/tick.c

@@ -61,3 +61,21 @@ int rt_hw_tick_init(void)
 
     return 0;
 }
+
+/**
+ * This function will delay for some us.
+ *
+ * @param us the delay time of us
+ */
+void rt_hw_us_delay(rt_uint32_t us)
+{
+    unsigned long start_time;
+    unsigned long end_time;
+    unsigned long run_time;
+
+    start_time = get_ticks();
+    end_time = start_time + us * (TIMER_CLK_FREQ / 1000000);
+    do{
+        run_time = get_ticks();
+    } while(run_time < end_time);
+}

bsp/cvitek/drivers/SConscript

@@ -12,6 +12,9 @@ if GetDepend('BSP_USING_CV1800B') or GetDepend('BSP_USING_C906_LITTLE'):
 if GetDepend('BSP_USING_CV1800B'):
     src += ['drv_gpio.c']
 
+if GetDepend('BSP_USING_I2C'):
+    src += ['drv_hw_i2c.c']
+
 CPPDEFINES += ['-DCONFIG_64BIT']
 
 group = DefineGroup('drivers', src, depend = [''], CPPDEFINES = CPPDEFINES, CPPPATH = CPPPATH)