Improvements and fixes in I2C slave (#2982)

Author: josesimoes

src/CLR/Core/Hardware/Hardware.cpp

@@ -158,6 +158,11 @@ void CLR_HW_Hardware::ProcessActivity()
         eventsCLR |= Event_I2cMaster;
     }
 
+    if (events & SYSTEM_EVENT_FLAG_I2C_SLAVE)
+    {
+        eventsCLR |= Event_I2cSlave;
+    }
+
     if (events & SYSTEM_EVENT_FLAG_ONEWIRE_MASTER)
     {
         eventsCLR |= Event_OneWireHost;

src/CLR/Include/nanoCLR_Hardware.h

@@ -23,10 +23,10 @@ struct CLR_HW_Hardware
     static const CLR_UINT32 c_Default_WakeupEvents =
         SYSTEM_EVENT_FLAG_COM_IN | SYSTEM_EVENT_FLAG_COM_OUT | SYSTEM_EVENT_FLAG_STORAGE_IO |
         SYSTEM_EVENT_FLAG_SYSTEM_TIMER | SYSTEM_EVENT_FLAG_USB_IN | SYSTEM_EVENT_FLAG_USB_OUT |
-        SYSTEM_EVENT_FLAG_SPI_MASTER | SYSTEM_EVENT_FLAG_I2C_MASTER | SYSTEM_EVENT_HW_INTERRUPT |
-        SYSTEM_EVENT_FLAG_SOCKET | SYSTEM_EVENT_FLAG_DEBUGGER_ACTIVITY | SYSTEM_EVENT_FLAG_MESSAGING_ACTIVITY |
-        SYSTEM_EVENT_FLAG_ONEWIRE_MASTER | SYSTEM_EVENT_FLAG_RADIO | SYSTEM_EVENT_FLAG_WIFI_STATION |
-        SYSTEM_EVENT_FLAG_BLUETOOTH;
+        SYSTEM_EVENT_FLAG_SPI_MASTER | SYSTEM_EVENT_FLAG_I2C_MASTER | SYSTEM_EVENT_FLAG_I2C_SLAVE |
+        SYSTEM_EVENT_HW_INTERRUPT | SYSTEM_EVENT_FLAG_SOCKET | SYSTEM_EVENT_FLAG_DEBUGGER_ACTIVITY |
+        SYSTEM_EVENT_FLAG_MESSAGING_ACTIVITY | SYSTEM_EVENT_FLAG_ONEWIRE_MASTER | SYSTEM_EVENT_FLAG_RADIO |
+        SYSTEM_EVENT_FLAG_WIFI_STATION | SYSTEM_EVENT_FLAG_BLUETOOTH;
 
     //--//
 

src/CLR/Include/nanoCLR_Runtime.h

@@ -3427,6 +3427,7 @@ typedef enum Events
     Event_Bluetooth         = 0x00001000,
     Event_UsbIn             = 0x00002000,
     Event_UsbOut            = 0x00004000,
+    Event_I2cSlave          = 0x00010000,
     Event_AppDomain         = 0x02000000,
     Event_Socket            = 0x20000000,
     Event_IdleCPU           = 0x40000000,

src/HAL/Include/nanoHAL_v2.h

@@ -90,6 +90,7 @@ typedef enum SLEEP_LEVEL
 #define SYSTEM_EVENT_FLAG_SPI_MASTER         0x02000000
 #define SYSTEM_EVENT_FLAG_I2C_MASTER         0x04000000
 #define SYSTEM_EVENT_HW_INTERRUPT            0x08000000
+#define SYSTEM_EVENT_FLAG_I2C_SLAVE          0x10000000
 #define SYSTEM_EVENT_FLAG_DEBUGGER_ACTIVITY  0x20000000
 #define SYSTEM_EVENT_FLAG_MESSAGING_ACTIVITY 0x40000000
 // #define SYSTEM_EVENT_FLAG_UNUSED_0x80000000         0x80000000

targets/ESP32/ESP32/target_system_device_i2c_slave_config.h

@@ -3,7 +3,8 @@
 // See LICENSE file in the project root for full license information.
 //
 
+// IDF driver requires slave device buffer size to >100 bytes
 // I2C slave TX buffer size
-#define I2C_SLAVE_TX_BUF_LEN 16
+#define I2C_SLAVE_TX_BUF_LEN 128
 // I2C slave RX buffer size
-#define I2C_SLAVE_RX_BUF_LEN 16
+#define I2C_SLAVE_RX_BUF_LEN 128