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您好!tronlong提供的最新的linux3.3内核已经对uart0和uart1做了rs485功能的支持,uart2默认为启动串口。如何想使能uart0和uart1 rs485的功能,只需在menuconfig将485使能。7 U0 X. C Y( W: b! Y
*** DaVinci Core Type *** | |( @# x! p6 L8 J/ h, h
| | [ ] DaVinci 644x based system | |+ a7 o+ K3 B! D3 M0 V4 c' x+ M
| | [ ] DaVinci 355 based system | |& N& V& W4 m2 Z; p
| | [ ] DaVinci 646x based system | |
5 Z: ~2 |! { y- F- d: I* }# T# v; u | | [ ] DA830/OMAP-L137/AM17x based system | |
7 r) r9 A) |4 C; P) D | | [*] DA850/OMAP-L138/AM18x based system | |( M) V2 ?# [/ m% R* g
| | [ ] Enable UART1 flow control | |
# V0 ~6 i! ^' W) }* a | | [ ] Enable UART0 RS485 funcation | |
, u+ D. ?1 U! b$ \% |) K3 ? | | [*] Enable UART1 RS485 funcation 0 l. z4 Z* H; `+ X
4 H% [. j% T4 i# ?# K) b' a$ S想了解详细的功能实现,也可以查看8250.c文件里面的;
1 X# T* \$ e: T9 L5 B+ gvoid serial8250_tx_chars(struct uart_8250_port *up)
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}; p/ M5 D& C- Z1 K5 l
/ e! e7 a. j% B2 h, R/ u- l+#if 13 K9 L' @$ g& H" Z; w
+ /* The funcation with RS485 flow control */
& i: _$ [5 S+ p+ if (up->port.private_data) {
. e5 M3 p7 ~" N/ j+ Y; P6 a k: ?+ struct serial8250_flow_ctrl *flow_ctrl_p;
# L, K. R9 s4 }( Y/ ^+ flow_ctrl_p = up->port.private_data;
+ F# ^5 _. A/ c" D' } r+& C* r% \9 S$ j9 z
+ if (flow_ctrl_p->gpio) {
, N$ |. m( y# O+ gpio_set_value(flow_ctrl_p->gpio, 1);
) S8 B' @- e* w6 l, k" V+ ndelay(50); /* Propagation delay >= 50ns */; V8 k6 p! c1 q3 g
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+ }
1 o6 E+ `7 u0 f+#endif& b6 b0 M1 P: f
希望对您有帮助。
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