Add Kconfig for IDF and option to disable HAL mutexes

IDF Options:
- Autostart Arduino (implements app_main)
- Disable HAL locks
- Set HAL debug level
- Auto-connect STA if configured (else will connect after WiFi.begin())

cores/esp32/esp32-hal-i2c.c

@@ -30,7 +30,9 @@
 
 struct i2c_struct_t {
     i2c_dev_t * dev;
+#if !CONFIG_DISABLE_HAL_LOCKS
     xSemaphoreHandle lock;
+#endif
     uint8_t num;
 };
 
@@ -42,6 +44,15 @@ enum {
     I2C_CMD_END
 };
 
+#if CONFIG_DISABLE_HAL_LOCKS
+#define I2C_MUTEX_LOCK()
+#define I2C_MUTEX_UNLOCK()
+
+static i2c_t _i2c_bus_array[2] = {
+    {(volatile i2c_dev_t *)(DR_REG_I2C_EXT_BASE), 0},
+    {(volatile i2c_dev_t *)(DR_REG_I2C1_EXT_BASE), 1}
+};
+#else
 #define I2C_MUTEX_LOCK()    do {} while (xSemaphoreTake(i2c->lock, portMAX_DELAY) != pdPASS)
 #define I2C_MUTEX_UNLOCK()  xSemaphoreGive(i2c->lock)
 
@@ -49,6 +60,7 @@ static i2c_t _i2c_bus_array[2] = {
     {(volatile i2c_dev_t *)(DR_REG_I2C_EXT_BASE), NULL, 0},
     {(volatile i2c_dev_t *)(DR_REG_I2C1_EXT_BASE), NULL, 1}
 };
+#endif
 
 i2c_err_t i2cAttachSCL(i2c_t * i2c, int8_t scl)
 {
@@ -353,12 +365,14 @@ i2c_t * i2cInit(uint8_t i2c_num, uint16_t slave_addr, bool addr_10bit_en)
 
     i2c_t * i2c = &_i2c_bus_array[i2c_num];
 
+#if !CONFIG_DISABLE_HAL_LOCKS
     if(i2c->lock == NULL){
         i2c->lock = xSemaphoreCreateMutex();
         if(i2c->lock == NULL) {
             return NULL;
         }
     }
+#endif
 
     if(i2c_num == 0) {
         SET_PERI_REG_MASK(DPORT_PERIP_CLK_EN_REG,DPORT_I2C_EXT0_CLK_EN);