Update esp32-hal-i2c.c

wait for data to be latched and increase timeout in attempt to fix clock stretch issues Connected issues: http://esp32.com/viewtopic.php?f=19&t=632&p=2832#p2801 espressif#81 espressif#53 espressif#11

Author: me-no-dev

cores/esp32/esp32-hal-i2c.c

@@ -172,9 +172,13 @@ i2c_err_t i2cWrite(i2c_t * i2c, uint16_t address, bool addr_10bit, uint8_t * dat
  }
  }
  i = 0;
+ uint32_t fifotail = 0;
  while(i<dataSend) {
+ fifotail = i2c->dev->fifo_st.tx_fifo_end_addr;
  i++;
  i2c->dev->fifo_data.data = data[index++];
+ // Wait for FIFO to update
+ while(i2c->dev->fifo_st.tx_fifo_end_addr == fifotail) {};
  }
  i2cSetCmd(i2c, 1, I2C_CMD_WRITE, willSend, false, false, true);
  dataLen -= willSend;
@@ -389,7 +393,7 @@ i2c_t * i2cInit(uint8_t i2c_num, uint16_t slave_addr, bool addr_10bit_en)
  i2c->dev->ctr.scl_force_out = 1 ;
  i2c->dev->ctr.clk_en = 1;
 
- i2c->dev->timeout.tout = 2000;
+ i2c->dev->timeout.tout = 400000;//clocks max=1048575
  i2c->dev->fifo_conf.nonfifo_en = 0;
 
  i2c->dev->slave_addr.val = 0;