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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 r) Y* V; w$ u1 F) C. A, \ *** DaVinci Core Type *** | |% A4 K6 y- c9 D" X
| | [ ] DaVinci 644x based system | |
* ]2 R: E; u' G* h | | [ ] DaVinci 355 based system | |7 O) M5 C2 P$ y
| | [ ] DaVinci 646x based system | |
v3 b& a. A( g8 m: b$ F | | [ ] DA830/OMAP-L137/AM17x based system | |* X( ^' j9 ?0 r* Z
| | [*] DA850/OMAP-L138/AM18x based system | |
( e H" y* |3 b0 R9 R; b# i1 H7 V | | [ ] Enable UART1 flow control | |
$ e( b8 o- `! ~8 p | | [ ] Enable UART0 RS485 funcation | |
0 x! V- v p: K1 c' [4 f | | [*] Enable UART1 RS485 funcation 0 b; b: i* a6 J2 V8 X7 E0 E
3 j9 P, c. m5 y# K" x5 W想了解详细的功能实现,也可以查看8250.c文件里面的;
- s, N F3 P* u" |8 L, K0 P' a; Qvoid serial8250_tx_chars(struct uart_8250_port *up)- k, o7 d( L" `1 b
return;" J3 \5 h- y% `, L
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$ T3 K9 X0 u& ?3 k2 t- X1 [5 _/ y+#if 1
, n! s. v! b [5 ]$ [, _+ /* The funcation with RS485 flow control */5 D- a8 g* i* a( D
+ if (up->port.private_data) {: e9 N9 I6 l3 \& r6 T
+ struct serial8250_flow_ctrl *flow_ctrl_p;
# @0 s- }- z \$ E3 T- S+ flow_ctrl_p = up->port.private_data;8 q, @! {# m1 e4 o- L
+
" V( k8 J; z8 p/ |# r+ if (flow_ctrl_p->gpio) {
& s0 \# n3 @; I, _% a8 |4 Y+ i1 D" x+ gpio_set_value(flow_ctrl_p->gpio, 1);
$ ?- Z( g# E! o. g7 O+ ndelay(50); /* Propagation delay >= 50ns */
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+ }: i: p3 k' M; }+ T) c
+#endif
8 j, A g2 [* _2 p9 x2 H希望对您有帮助。
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