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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。) c: t, J/ v, }# R, v
*** DaVinci Core Type *** | |
; W, [. w* A5 x) k# B. C: Q | | [ ] DaVinci 644x based system | |4 U0 c' Q; i5 V& [ Z
| | [ ] DaVinci 355 based system | |3 T; Y: [, y# C9 |4 V! |' @0 O
| | [ ] DaVinci 646x based system | |+ Y: Z; H" s3 S2 C+ K. _
| | [ ] DA830/OMAP-L137/AM17x based system | |
3 r. s7 }( j3 a) L/ H+ B* e3 v | | [*] DA850/OMAP-L138/AM18x based system | |
9 y& l2 y. O/ l' ` | | [ ] Enable UART1 flow control | |9 B( W3 }0 Z) C" A/ j7 ^4 @; A
| | [ ] Enable UART0 RS485 funcation | |! d: R1 W9 j E1 @% t3 t
| | [*] Enable UART1 RS485 funcation
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" W1 B& [7 B: g$ ?' Q2 n想了解详细的功能实现，也可以查看8250.c文件里面的；
, Z( I: L# q0 A5 Pvoid serial8250_tx_chars(struct uart_8250_port *up)
$ \/ U$ A. r0 I; C8 z return;
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* U; \ e* ^, U' ^; }+#if 1
' K& {3 e, E& |" H& a+ /* The funcation with RS485 flow control */
* S$ F3 t& G1 c# C/ {+ if (up->port.private_data) {
% d( v8 d* S" c% [8 A6 ~* g! l+ struct serial8250_flow_ctrl *flow_ctrl_p;- @9 ~( w) v3 t5 i, e7 r* ?
+ flow_ctrl_p = up->port.private_data;
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$ g6 H" |9 h) T$ S& P6 p+ if (flow_ctrl_p->gpio) {
i2 F- G5 ~$ ^: y0 E: ]+ gpio_set_value(flow_ctrl_p->gpio, 1);+ n# E7 P0 l6 s: c- r
+ ndelay(50); /* Propagation delay >= 50ns */; G' ]4 |' a* t0 ]% h7 x
+ }
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+#endif: B8 R/ Z$ G6 i8 y7 f
希望对您有帮助。
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发表于 2014-10-31 17:01:26
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