2.GPIO27, GPIO39, and GPIO40 have weak driving capabilities, so it is recommended to use them only as input pins
+ +++Note:
+1.Pin37-GPIO11,Pin38-GPIO12,Pin39-GPIO13,Module that support GNSS function do not enable the multiplexing function of this pin and it need to be left open.
+
class machine.UART(UART.UARTn, baudrate, databits, parity, stopbits, flowctl)
Parametric Description:
@@ -39,6 +39,22 @@ This class transmits data through the UART.class machine.UART(UART.UARTn, baudrate, databits, parity, stopbits, flowctl)
+Parametric Description:
+UARTn - UART number, int type, UARTn description is as follows:UART0 - DEBUG PORT UART1 - BT PORT UART2 - MAIN PORT UART3 - USB CDC PORT
baudratec - Baud rate, int type, supports common baud rates such as4800、9600、19200、38400、57600、115200、230400.
databits - Data bits [8], int type.
parity - Parity (0-None, 1-even, 2-odd), int type.
stopbits - Stop bit [1 ~ 2], int type.
flowctl - Hardware control flow (0-FC_NONE, 1-FC_HW), int type.
class machine.UART(UART.UARTn, baudrate, databits, parity, stopbits, flowctl, [group])
@@ -1237,15 +1253,16 @@ This method disables the UART. `-1` - Failed execution +### `uart.control_485` +Attention：
Uart0 is not recommended
-EC200ACN_LA module uart1 pin number is different from other models:
+EC200ACN_LA,EC200AEU_V1HA,EC200ACN_V1DA module uart1 pin number is different from other models:
TX: Pin26
RX: Pin27
uart.control_485uart.control_485(UART.GPIOn, direction)
This method is used to control the 485 communication direction, and the specified GPIO is pulled up and down before and after the serial port sends data to indicate the 485 communication direction.
Parametric Description:
GPIOn - GPIO Pin number to control, refer to pin definition in [Pin module](machine.Pin.md), int type.
GPIOn - GPIO Pin number to control, refer to pin definition in Pin module, int type.
direction - Pin level change, int type, described as follows:1It indicates that the pin level change is: the serial port is pulled up by low before sending data, and then pulled down by high after sending data0It indicates that the pin level change is: the serial port is pulled down by high before sending data, and then pulled up by low after sending data
uart.control_485This API is not supported by this model
示例：
-
->>> from machine import I2C
+>>> from machine import I2C
>>> # 创建I2C对象
>>> i2c_obj = I2C(I2C.I2C0, I2C.STANDARD_MODE) # 返回I2C对象
@@ -104,12 +102,12 @@
示例：
-
->>> from machine import I2C
+>>> from machine import I2C
>>> # 创建I2C对象
>>> i2c_obj = I2C(I2C.I2C0, I2C.STANDARD_MODE,0) # 返回I2C对象
+
2.GPIO27、GPIO39、GPIO40驱动能力较弱，建议仅做输入引脚使用
++注：
+1.Pin37-GPIO11,Pin38-GPIO12,Pin39-GPIO13,支持GNSS的模块不会启用此引脚的复用功能，因此该引脚需要保持处于断开状态。
+
class machine.UART(UART.UARTn, baudrate, databits, parity, stopbits, flowctl)
参数描述：
@@ -71,6 +71,22 @@class machine.UART(UART.UARTn, baudrate, databits, parity, stopbits, flowctl)
+参数描述：
+UARTn - UART编号，int类型，UARTn说明如下：UART0 - DEBUG PORT UART1 - BT PORT UART2 - MAIN PORT UART3 - USB CDC PORT
baudratec - 波特率，int类型，支持常用波特率，如4800、9600、19200、38400、57600、115200、230400等;
databits - 数据位[8]，int类型。
parity - 奇偶校验(0 – NONE，1 – EVEN，2 – ODD)，int类型。
stopbits - 停止位[1 ~ 2]，int类型。
flowctl - 硬件控制流(0 – FC_NONE， 1 – FC_HW)，int类型。
class machine.UART(UART.UARTn, baudrate, databits, parity, stopbits, flowctl, [group])
@@ -1266,15 +1282,17 @@ uart.close() 成功返回整型值`0`，失败返回整型值`-1`。 +### `uart.control_485` +注意：
uart0不建议使用
-EC200ACN_LA模组uart1引脚号与其他型号不同：
+EC200ACN_LA,EC200AEU_V1HA,EC200ACN_V1DA 模组uart1引脚号与其他型号不同：
TX:引脚号26
RX:引脚号27
uart.control_485uart.control_485(UART.GPIOn, direction)
该方法用于控制485通信方向，串口发送数据之前和之后进行拉高拉低指定GPIO，用来指示485通信的方向。
参数描述：
GPIOn - 需要控制的GPIO引脚号，参照[Pin模块](machine.Pin.md)的引脚定义，int类型。
GPIOn - 需要控制的GPIO引脚号，参照Pin模块的引脚定义，int类型。
direction - 引脚电平变化，int类型，说明如下：1表示引脚电平变化为：串口发送数据之前由低拉高、发送数据之后再由高拉低0表示引脚电平变化为：串口发送数据之前由高拉低、发送数据之后再由低拉高
返回值描述：
成功返回整型值0，失败返回整型值-1。
示例：
-from machine import UART
uart1 = UART(UART.UART1, 115200, 8, 0, 1, 0)
art1.control_485(UART.GPIO24, 1)
+from machine import UART
+uart1 = UART(UART.UART1, 115200, 8, 0, 1, 0)
+art1.control_485(UART.GPIO24, 1)
+
uart.control_485该型号不支持此API