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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。$ b7 v8 G6 o0 M7 X0 u
*** DaVinci Core Type *** | |
- l1 [3 q2 `* \) p | | [ ] DaVinci 644x based system | | n* e, L" a; A' Y* `1 U
| | [ ] DaVinci 355 based system | |
% H" a: E0 E$ ^% d* p | | [ ] DaVinci 646x based system | |
/ d: T- @6 l* E% Q | | [ ] DA830/OMAP-L137/AM17x based system | |! y3 ]: U8 O' s/ M) g
| | [*] DA850/OMAP-L138/AM18x based system | |( Q- o5 |% p$ x- b
| | [ ] Enable UART1 flow control | |. ^7 S2 ?4 L+ k, n0 c
| | [ ] Enable UART0 RS485 funcation | |
$ a" q) u* |3 `8 ^7 e | | [*] Enable UART1 RS485 funcation 5 x3 V, z& I2 ^! V: u
2 h: ^. h) N: }) A/ x想了解详细的功能实现,也可以查看8250.c文件里面的;
; `) a. {8 {5 ^& W9 fvoid serial8250_tx_chars(struct uart_8250_port *up)
, R8 L$ `8 a: y, q- c- [( G, T5 j3 U return;6 A$ ?3 }. ^" r
}
# U& u- k5 P" g9 K! ]) U
5 P4 S, \6 @4 X/ _1 A9 W+#if 1
7 v/ @8 H. R& R6 P+ /* The funcation with RS485 flow control */
" k2 [: d0 x4 m. P3 Q+ if (up->port.private_data) {( c) o. r {$ P& z1 K8 p0 Q4 M
+ struct serial8250_flow_ctrl *flow_ctrl_p;
) k" a# g; r( q2 M; i c+ flow_ctrl_p = up->port.private_data;
+ g7 H) R$ {/ L% x3 X! I- \+
' l8 `/ ]! @0 \4 z: Y+ if (flow_ctrl_p->gpio) {% r% i: k0 T( J: y6 S+ \4 z
+ gpio_set_value(flow_ctrl_p->gpio, 1);- i5 |! J6 {% M, K
+ ndelay(50); /* Propagation delay >= 50ns */
3 p+ }1 |6 B5 p. o5 y& l2 v+ }, @& E! Q4 F4 m$ U: U
+ }" j% l( G+ M9 p2 _
+#endif
$ Y; O: ~* x- E希望对您有帮助。' _; g5 f2 c% \8 e4 i' n
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