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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。
9 |# G+ w/ [& q. g( y, Q *** DaVinci Core Type *** | |2 }1 Q: q, P7 u4 q8 m9 {/ a) r' o
| | [ ] DaVinci 644x based system | | x5 h6 F4 h+ G- |2 ~) o
| | [ ] DaVinci 355 based system | |
" ]3 P! X1 z: Q( F& }* w | | [ ] DaVinci 646x based system | |& l7 Q$ U" Y0 N! F" r
| | [ ] DA830/OMAP-L137/AM17x based system | |
, _/ J4 j& O Q% `" P | | [*] DA850/OMAP-L138/AM18x based system | |; E& K) O* {8 b
| | [ ] Enable UART1 flow control | |. i. h O, h- L t T' ^2 Y
| | [ ] Enable UART0 RS485 funcation | |# B: F' S' o' s; x
| | [*] Enable UART1 RS485 funcation
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/ N+ P" ~- {4 V! h1 a想了解详细的功能实现,也可以查看8250.c文件里面的;
2 Q' E3 j$ b3 U2 c2 \8 l pvoid serial8250_tx_chars(struct uart_8250_port *up)4 P3 H) @" e3 O* Z
return;: e# s" }( g% }0 W6 {4 A: O9 s: {
}
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6 t1 e$ }5 H5 _. {2 M4 w1 z, m: T+#if 1
) B* y/ j& }) ]+ /* The funcation with RS485 flow control */; C4 T2 \9 ]* U% u
+ if (up->port.private_data) {
. ~$ G3 T2 o5 w) h9 A- C: K3 y) m( @+ struct serial8250_flow_ctrl *flow_ctrl_p;' _$ c* t) y' j/ t% i0 {
+ flow_ctrl_p = up->port.private_data;) A L& d7 p. v# z
+
' @6 _- A# N* ]+ P$ h4 O$ @4 y+ n7 J+ if (flow_ctrl_p->gpio) {
+ ]* K N) b$ V# u8 C$ w! F+ gpio_set_value(flow_ctrl_p->gpio, 1);9 ~/ T3 p: ^9 K' A. m
+ ndelay(50); /* Propagation delay >= 50ns */
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+ }
' f. Q6 S2 F+ f. [! s+#endif
, K. D& _! v3 k希望对您有帮助。
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