struct uart_port *port = state->uart_port; if (port && !uart_tx_stopped(port)) port->ops->start_tx(port); } 1. 2. 3. 4. 5. 6. 7. 8. 通常在底层串口驱动层会使能发送中断,例如: static void ar933x_uart_start_tx(struct uart_port *port) { struct ar933x_uart_port *up = c...
整个tty架构大概的样子如图3.1所示,简单来分的话可以说成两层,一层是下层我们的串口驱动层,它直接与硬件相接触,我们需要填充一个 struct uart_ops 的结构体,另一层是上层 tty 层,包括 tty 核心以及线路规程,它们各自都有一个 Ops 结构,用户空通过间是 tty 注册的字符设备节点来访问。 如图3.2所示,tty设备发送...
static const struct uart_ops imx_uart_pops = { 1. .tx_empty = imx_uart_tx_empty, 1. .set_mctrl = imx_uart_set_mctrl, 1. .get_mctrl = imx_uart_get_mctrl, 1. .stop_tx = imx_uart_stop_tx, 1. .start_tx = imx_uart_start_tx, 1. .stop_rx = imx_uart_stop_rx, 1. .en...
struct uart_ops涵盖了驱动可对串口的所有操作 structuart_ops{unsignedint(*tx_empty)(structuart_port *);void(*set_mctrl)(structuart_port *,unsignedintmctrl);unsignedint(*get_mctrl)(structuart_port *);void(*stop_tx)(structuart_port *);void(*start_tx)(structuart_port *);void(*throttle)(s...
start_tx 启动发送 stop_rx 停止接收 startup 开启UART shutdown 关闭UART set_termios 设置UART属性,比如波特率、数据位数、停止位数、奇偶校验、流控等。 struct uart_driver指代一个UART驱动,struct uart_port指代一个具体UART端口,它们与struct uart_ops的关系大致如下图。 下面以某厂商的UART控制器驱动为例,看看...
[i].serial.ops=&stm32_uart_ops;uart_obj[i].serial.config=config;/* register UART device */result=rt_hw_serial_register(&uart_obj[i].serial,uart_obj[i].config->name,RT_DEVICE_FLAG_RDWR|RT_DEVICE_FLAG_INT_RX|RT_DEVICE_FLAG_INT_TX|uart_obj[i].uart_dma_flag,NULL);RT_ASSERT(...
struct uart_ops涵盖了驱动可对串口的所有操作 复制 struct uart_ops {unsignedint(*tx_empty)(struct uart_port *);void (*set_mctrl)(struct uart_port *, unsignedintmctrl);unsignedint(*get_mctrl)(struct uart_port *);void (*stop_tx)(struct uart_port *);void (*start_tx)(struct uart_port ...
3、uart_ops uart_ops涵盖了串口驱动可对串口设备进行的所有操作。 /* * This structure describes all the operations that can be * done on the physical hardware. */ struct uart_ops { unsigned int (*tx_empty)(struct uart_port *); /* 串口的Tx FIFO缓存是否为空 */ ...
在uart_port 里还有一个非常重要的成员 struct uart_ops *ops ,这个也是需要我们自己来实现的,一般芯片厂家都写好了或者只需要稍作修改。 structuart_ops {unsignedint(*tx_empty)(structuart_port *);/* 串口的Tx FIFO缓存是否为空 */void(*set_mctrl)(structuart_port *,unsignedintmctrl);/* 设置串口mo...
49 struct uart_ops { 50 unsigned int (*tx_empty)(struct uart_port *); 51 void (*set_mctrl)(struct uart_port *, unsigned int mctrl); 52 unsigned int (*get_mctrl)(struct uart_port *); 53 void (*stop_tx)(struct uart_port *); 54 void (*start_tx)(struct uart_port *); 55 ...