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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。
3 g! {- o" ~4 W *** DaVinci Core Type *** | |- Z8 l, E8 v% h5 @! R6 n3 O" D
| | [ ] DaVinci 644x based system | |, G' F1 Y, o9 _: _
| | [ ] DaVinci 355 based system | |9 B# R# K0 ]; e9 G1 @% D
| | [ ] DaVinci 646x based system | |
3 j' D( P3 G e; C! v8 _ | | [ ] DA830/OMAP-L137/AM17x based system | |
: s' ` O# k7 v/ b* \& o6 ? | | [*] DA850/OMAP-L138/AM18x based system | |. S( K$ K/ V0 ?
| | [ ] Enable UART1 flow control | |" Q4 Z. [, u' X: }) X. ~
| | [ ] Enable UART0 RS485 funcation | |2 J. P6 A' S; m4 ^: E! r x
| | [*] Enable UART1 RS485 funcation 8 k: m$ c1 F: @3 D
' C8 {- u7 K) }想了解详细的功能实现,也可以查看8250.c文件里面的;
/ R/ X1 s+ G zvoid serial8250_tx_chars(struct uart_8250_port *up)
* j, f/ b' J6 b return;
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3 q, b1 x- a4 t* V/ S! k: N+#if 1
: M- y& m. F0 n- V! c" Y+ /* The funcation with RS485 flow control *// o, t: K$ Z. Y2 n' j5 Y
+ if (up->port.private_data) {
/ Q$ ~$ U, \' t4 h! V9 p+ struct serial8250_flow_ctrl *flow_ctrl_p;
3 B8 p$ @# _4 a% ~9 h0 T+ f+ flow_ctrl_p = up->port.private_data;2 `' }) ?; _( Y% Z( f' x$ b
+' x# K: Q1 h* t/ U
+ if (flow_ctrl_p->gpio) {- O. W( Y* F- k. a5 d3 F
+ gpio_set_value(flow_ctrl_p->gpio, 1);
n8 n4 }+ j9 t+ u' q+ ndelay(50); /* Propagation delay >= 50ns */. Q* I1 i- L6 K3 a( L1 F) y
+ }
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+#endif9 Z3 e' ]' U: I8 ~& N
希望对您有帮助。
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