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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。
5 [$ [. k- ?4 \$ I8 ]8 G; C *** DaVinci Core Type *** | |
) k5 Z- v6 c. i& S% u- W$ h | | [ ] DaVinci 644x based system | |! k% K9 A4 R: F: R+ K/ q8 R
| | [ ] DaVinci 355 based system | |/ L$ p+ p* P5 g4 Q. x6 k
| | [ ] DaVinci 646x based system | |
& W+ S6 S' o% x | | [ ] DA830/OMAP-L137/AM17x based system | |) i9 d. X' _9 m" _7 K& F- d
| | [*] DA850/OMAP-L138/AM18x based system | |
6 [9 x2 E- F" K' S {$ u" _ | | [ ] Enable UART1 flow control | |
( o8 h7 m+ a. M# Z0 W$ B | | [ ] Enable UART0 RS485 funcation | |
% k4 T* `; {. Q( ~3 f. @& o- _ | | [*] Enable UART1 RS485 funcation
) k( R# j& E+ C6 K! Z* M, w6 q) S. ~; ? y; W" Z0 k+ O
想了解详细的功能实现，也可以查看8250.c文件里面的；
; L8 ~- \2 o$ E# r4 _% `+ Uvoid serial8250_tx_chars(struct uart_8250_port *up)" H3 c; P; L7 a8 r( ]8 z3 q- x, M, p
return;3 }' u$ I8 X! c5 r# H, ?
}
+ O0 u( S' ]! ~( [* z. ^1 g: q$ {9 p6 ~6 |# S8 b8 V
+#if 1- b- Q( I3 i4 S/ w4 d. g* w9 y
+ /* The funcation with RS485 flow control */
F8 U7 z4 j! Z! K9 x2 T1 b c+ if (up->port.private_data) {, Q8 T ^3 A% B7 V% h* Y
+ struct serial8250_flow_ctrl *flow_ctrl_p;
. d& m# S ^2 V! g$ [+ flow_ctrl_p = up->port.private_data;
! B% r* G; t( b2 `1 v& m+
- H) @' {' ]: F, i; T# U9 \6 W, t+ if (flow_ctrl_p->gpio) {
+ [+ {' T( A6 x% B) y$ T% x6 h+ gpio_set_value(flow_ctrl_p->gpio, 1);8 c' U4 Z) i; f5 F9 L
+ ndelay(50); /* Propagation delay >= 50ns */
R" i0 g' m+ {8 o1 w7 R+ }
' M+ {: g4 P6 U4 Y+ }, h- z- @3 q; H6 x& [$ D
+#endif
% V% Q8 C& f4 Z. @) |; ~( R希望对您有帮助。) y. P: e6 \# k6 [
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发表于 2014-10-31 17:01:26
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