Wangjialin 288f4f63f0 Add UART driver ...

1. add uart.h and uart.c
2. add ESP_ERR_TIMEOUT in esp_err.h
3. add UART AHB FIFO address in uart_reg.h
4. modify xRingbufferSendFromISR return value in ringbuffer.c
5. add #include "soc/gpio_sig_map.h" in gpio.h

2016-10-24 09:17:10 +08:00

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