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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 U8 B" T4 d/ v L *** DaVinci Core Type *** | |: k9 l( P3 R Y. a
| | [ ] DaVinci 644x based system | |
$ X* O+ ^7 `# [1 O9 [7 Z | | [ ] DaVinci 355 based system | |/ E* n ]3 \& T8 K
| | [ ] DaVinci 646x based system | |0 n0 w: o* |$ M8 o
| | [ ] DA830/OMAP-L137/AM17x based system | |( E& V8 f3 l% c
| | [*] DA850/OMAP-L138/AM18x based system | |- i1 t. V9 E# u- ~+ |; v7 I
| | [ ] Enable UART1 flow control | |8 L" C4 m" M+ ^& x
| | [ ] Enable UART0 RS485 funcation | |
( }4 H4 \ Q' u1 y8 C& H | | [*] Enable UART1 RS485 funcation ' h) E9 H! r( R9 b
z; U2 e9 L7 W3 a
想了解详细的功能实现，也可以查看8250.c文件里面的；7 R2 }- k0 w& N* t; ?, S0 z/ r: w
void serial8250_tx_chars(struct uart_8250_port *up): [( o$ p. Y. z+ w/ f( x
return;# I' d" _# |. q1 D. l" e
}
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+#if 12 i) P3 v: c& g7 }3 x
+ /* The funcation with RS485 flow control */
' `2 p ]9 d, v& V7 Q: p" Z# c+ if (up->port.private_data) {2 v/ ~0 r+ [& V7 G2 i7 t
+ struct serial8250_flow_ctrl *flow_ctrl_p;
5 c3 V5 {$ C [9 O+ b+ m+ flow_ctrl_p = up->port.private_data;% d: L3 Z! O8 h. Z3 L0 j- Z4 _
+' d/ {, R2 Z4 F# W' t( D$ ]
+ if (flow_ctrl_p->gpio) {% ~3 S& h F1 o2 o0 P6 H! D& _ z
+ gpio_set_value(flow_ctrl_p->gpio, 1);
5 U+ J& ~# `2 t, ^ _/ d, O+ ndelay(50); /* Propagation delay >= 50ns */
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+ }
/ k$ L+ D! Q. k2 @7 ]/ U4 O+#endif: w- A7 p2 b/ u7 V" \$ i0 Y/ `
希望对您有帮助。7 q- ]( k" n- j. y1 b+ t1 y
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发表于 2014-10-31 17:01:26
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