Merge pull request #27 from espressif/master

i2c clock stretch fix

Author: Jason2866

README.md

@@ -27,6 +27,10 @@ You can use [Arduino-ESP32 Online Documentation](https://docs.espressif.com/proj
 * [FAQ](https://docs.espressif.com/projects/arduino-esp32/en/latest/faq.html)
 * [Troubleshooting](https://docs.espressif.com/projects/arduino-esp32/en/latest/troubleshooting.html)
 
+### Supported Chips
+
+Visit the [supported chips](https://docs.espressif.com/projects/arduino-esp32/en/latest/getting_started.html#supported-soc-s) documentation to see the list of current supported ESP32 SoCs.
+
 ### Decoding exceptions
 
 You can use [EspExceptionDecoder](https://github.com/me-no-dev/EspExceptionDecoder) to get meaningful call trace.

boards.txt

@@ -9690,10 +9690,20 @@ deneyapmini.build.boot=qio
 deneyapmini.build.partitions=default
 deneyapmini.build.defines=
 
-deneyapmini.menu.CDCOnBoot.default=Disabled
-deneyapmini.menu.CDCOnBoot.default.build.cdc_on_boot=0
-deneyapmini.menu.CDCOnBoot.cdc=Enabled
-deneyapmini.menu.CDCOnBoot.cdc.build.cdc_on_boot=1
+deneyapmini.menu.CDCOnBoot.default=Enabled
+deneyapmini.menu.CDCOnBoot.default.build.cdc_on_boot=1
+deneyapmini.menu.CDCOnBoot.cdc=Disabled
+deneyapmini.menu.CDCOnBoot.cdc.build.cdc_on_boot=0
+
+deneyapmini.menu.MSCOnBoot.default=Disabled
+deneyapmini.menu.MSCOnBoot.default.build.msc_on_boot=0
+deneyapmini.menu.MSCOnBoot.msc=Enabled
+deneyapmini.menu.MSCOnBoot.msc.build.msc_on_boot=1
+
+deneyapmini.menu.DFUOnBoot.default=Disabled
+deneyapmini.menu.DFUOnBoot.default.build.dfu_on_boot=0
+deneyapmini.menu.DFUOnBoot.dfu=Enabled
+deneyapmini.menu.DFUOnBoot.dfu.build.dfu_on_boot=1
 
 deneyapmini.menu.PSRAM.disabled=Disabled
 deneyapmini.menu.PSRAM.disabled.build.defines=

cores/esp32/cbuf.h

@@ -62,7 +62,7 @@ class cbuf
 
     cbuf *next;
 
-private:
+protected:
     inline char* wrap_if_bufend(char* ptr) const
     {
         return (ptr == _bufend) ? _buf : ptr;

cores/esp32/esp32-hal-i2c-slave.c

@@ -302,7 +302,7 @@ esp_err_t i2cSlaveInit(uint8_t num, int sda, int scl, uint16_t slaveID, uint32_t
     i2c_ll_slave_init(i2c->dev);
     i2c_ll_set_fifo_mode(i2c->dev, true);
     i2c_ll_set_slave_addr(i2c->dev, slaveID, false);
-    i2c_ll_set_tout(i2c->dev, 32000);
+    i2c_ll_set_tout(i2c->dev, I2C_LL_MAX_TIMEOUT);
     i2c_slave_set_frequency(i2c, frequency);
 
     if (!i2c_slave_check_line_state(sda, scl)) {

cores/esp32/esp32-hal-i2c.c

@@ -24,6 +24,7 @@
 #include "soc/soc_caps.h"
 #include "soc/i2c_periph.h"
 #include "hal/i2c_hal.h"
+#include "hal/i2c_ll.h"
 #include "driver/i2c.h"
 
 typedef volatile struct {
@@ -91,6 +92,8 @@ esp_err_t i2cInit(uint8_t i2c_num, int8_t sda, int8_t scl, uint32_t frequency){
         } else {
             bus[i2c_num].initialized = true;
             bus[i2c_num].frequency = frequency;
+            //Clock Stretching Timeout: 20b:esp32, 5b:esp32-c3, 24b:esp32-s2
+            i2c_set_timeout((i2c_port_t)i2c_num, I2C_LL_MAX_TIMEOUT);
         }
     }
 #if !CONFIG_DISABLE_HAL_LOCKS

docs/source/getting_started.rst

@@ -37,7 +37,7 @@ SoC      Stable Development Datasheet
 ESP32    Yes    Yes         `ESP32 Datasheet`_
 ESP32-S2 Yes    Yes         `ESP32-S2 Datasheet`_
 ESP32-C3 Yes    Yes         `ESP32-C3 Datasheet`_
-ESP32-S3 No     No          Not Available Yet
+ESP32-S3 No     No          `ESP32-S3 Datasheet`_
 ======== ====== =========== ===================================
 
 See `Boards <boards/boards.html>`_ for more details about ESP32 development boards.
@@ -122,6 +122,7 @@ Resources
 .. _ESP32 Datasheet: https://www.espressif.com/sites/default/files/documentation/esp32_datasheet_en.pdf
 .. _ESP32-S2 Datasheet: https://www.espressif.com/sites/default/files/documentation/esp32-s2_datasheet_en.pdf
 .. _ESP32-C3 Datasheet: https://www.espressif.com/sites/default/files/documentation/esp32-c3_datasheet_en.pdf
+.. _ESP32-S3 Datasheet: https://www.espressif.com/sites/default/files/documentation/esp32-s3_datasheet_en.pdf
 .. _Arduino.cc: https://www.arduino.cc/en/Main/Software
 .. _Arduino Reference: https://www.arduino.cc/reference/en/
 .. _ESP32 Forum: https://esp32.com