具体的设备树配置可以在arch/arm64/boot/dts/freescale/xxx等路径下找到。MX93_PAD_GPIO_IO09__LPUART7_RX 0x31e // RXMX93_PAD_GPIO_IO11__LPUART7_RTS_B 0x31e // DE <;};&lpuart7 {uart-has-rtscts;rts-gpios = <&gpio2 7 GPIO_ACTIVE_HIGH>;linux,rs485-enabled-at-boot-time; // rs...
设备树配置如下(一般在arch/arm64/boot/dts/freescale/xxx 下,引脚描述文件 pinctrl_uart7:uart7grp{fsl,pins=;};&lpuart7{uart-has-rtscts;rts-gpios=<&gpio27GPIO_ACTIVE_HIGH>;linux,rs485-enabled-at-boot-time;// rs485 abilitata fin da subito al boot rs485-rts-active-high; rs485-rts-delay...
rs485-rts-active-high;rs485-rts-delay = >;};```在LPUART7的配置部分，上述代码段描述了其请求发送（RTS）引脚与MX93_PAD_GPIO_IO11的连接，以及相关的一些高级配置选项。需要注意的是，具体的配置细节可能因硬件和软件环境的不同而有所差异，因此在实际应用中，务必参考相关的技术文档和资源以确保正确配置。
pinctrl_uart7: uart7grp {fsl,pins = <MX93_PAD_GPIO_IO08__LPUART7_TX 0x31e // TXMX93_PAD_GPIO_IO09__LPUART7_RX 0x31e // RXMX93_PAD_GPIO_IO11__LPUART7_RTS_B 0x31e // DE>;};&lpuart7 {uart-has-rtscts;rts-gpios = <&gpio2 7 GPIO_ACTIVE_HIGH>;linux,rs485-enabled-at...
__u32 delay_rts_after_send;/*Delay after send (milliseconds)*/__u32 padding[5];/*Memory is cheap, new structs are a royal PITA ..*/+__u32 rs485_tx_en_gpio; }; diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c ...
rs485-rts-active-high; rs485-rx-during-tx; status = "okay"; }; As it is, I can only transmit. When I update the device tree as follows, that is, when I make rs485-rts-active-low, this time I can only receive and not transmit // Only receive &uart3 { pinctrl-names = "de...
//UART0->MCR = UART0->MCR & (~UART_MCR_LEV_RTS_Msk) | UART_RTS_IS_HIGH_LEV_ACTIVE; /* Flush Rx FIFO */ UART0->FCR |= UART_FCR_RFR_Msk; /* Clear data from RX FIFO */ /* Set RTS Trigger Level as 1 bytes INT*/ ...
rs485-rts-active-high; rs485-rts-delay = <1 1>; linux,rs485-enabled-at-boot-time; }; And in omap-serial.c, modified 'serial_omap_config_rs485' function as follows /* Enable or disable the rs485 support */ static void serial_omap_config_rs485(struct uart_port *port, struct seria...
Pin4DTRData Terminal Ready计算机告诉调制解调器可以进行传输。Pin5GNDGround地线。Pin6DSRData Set Ready调制解调器告诉计算机一切准备就绪。Pin7RTSRequest To Send计算机要求调制解调器将数据提交。Pin8CTSClear To Send调制解调器通知计算机可以传数据过来。Pin9RIRing Indicator调制解调器通知计算机有电话进来。
RTS Request To Send 计算机要求调制解调器将数据提交。 Pin8 CTS Clear To Send 调制解调器通知计算机可以传数据过来。 Pin9 RI Ring Indicator 调制解调器通知计算机有电话进来。 串行通信在软件设置里需要做多项设置,最常见的设置包括波特率(Baud)、奇偶校验(Parity Check)和停止位(Stop Bit) RS485 RS485是由...