该驱动通过UART外设的CTS_B引脚来控制RS485芯片的收发模式，确保了数据传输的准确性和及时性。同时，还提供了rs485-rts-delay、rs485-rts-active-low等配置选项，以适应不同的应用场景和需求。3fbc000 {compatible = "fsl,imx51-uart", "fsl,imx21-uart";reg = <0x73fbc000 0x4000>;/* 其他配置项 */}...
/* Set RTS pin active level as low level active --*/ UART0->MCR = UART0->MCR & (~UART_MCR_LEV_RTS_Msk) | UART_RTS_IS_LOW_LEV_ACTIVE; //UART0->MCR = UART0->MCR & (~UART_MCR_LEV_RTS_Msk) | UART_RTS_IS_HIGH_LEV_ACTIVE; /* Flush Rx FIFO */ UART0->FCR |= UART_F...
在传输数据时候需要将RS485 RE置高,发送使能,接收禁止;发送完数据以后需要将RS485 RE置低,接收使能,发送禁止。 清楚原理,修改驱动: 1.dts添加re使能口: &uart6 { pinctrl-0= <&uart6m1_xfer>; status="okay"; rs485-gpios = <&gpio4 RK_PB5 GPIO_ACTIVE_HIGH>; }; 2.驱动修改: diff--git a/i...
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When RTS control is used, it is important to be certain that RTS is set high before data is sent. Also, the RTS line must then be set low after the last data bit is sent. This timing is done by the software used to control the serial port and not by the converter. When an RS-...
rts-gpios = <&gpio2 14 GPIO_ACTIVE_LOW>;status = "okay";rs485-rts-delay = <1 1>;rs485-enabled-at-boot-time;uart-has-rtscts;fsl,dte-mode;}; /* UART8 external RS485 */pinctrl_uart8: uart8grp {fsl,pins = <MX6UL_PAD_ENET2_TX_EN__UART8_DTE_TX 0x13008MX6UL_PAD_ENET2_...
IOCTL_SERIAL_CLR_RTS IOCTL_SERIAL_CONFIG_SIZE IOCTL_SERIAL_IMMEDIATE_CHAR IOCTL_SERIAL_LSRMST_INSERT IOCTL_SERIAL_PURGE IOCTL_SERIAL_RESET_DEVICE IOCTL_SERIAL_WAIT_ON_MASK IOCTL_SERIAL_XOFF_COUNTER Supported Protocols Our serial protocol analyzer supports the following serial protocols: ...
rts-gpios = <&gpio3 2 GPIO_ACTIVE_HIGH>;uart-has-rtscts;linux,rs485-enabled-at-boot-time;status = "okay";}; pinctrl_uart4: uart4grp {fsl,pins = <MX6UL_PAD_UART4_TX_DATA__UART4_DCE_TX 0x1b0b1MX6UL_PAD_UART4_RX_DATA__UART4_DCE_RX 0x1b0b1MX6UL_PAD_LCD_HSYNC__G...
IOCTL_SERIAL_CLR_RTS IOCTL_SERIAL_CONFIG_SIZE IOCTL_SERIAL_IMMEDIATE_CHAR IOCTL_SERIAL_LSRMST_INSERT IOCTL_SERIAL_PURGE IOCTL_SERIAL_RESET_DEVICE IOCTL_SERIAL_WAIT_ON_MASK IOCTL_SERIAL_XOFF_COUNTER Supported Protocols Our serial protocol analyzer supports the following serial protocols: ...
The RTS line is connected to the RS-485 driver enable such that setting the RTS line to a high ( logic 1) state enables the RS-485 driver. Setting the RTS line low (logic 0) puts the dri ver into the tristate condition. This in effect disconnects 25、the driver from the bus, ...