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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。
0 [% I, Y6 d8 h *** DaVinci Core Type *** | |
" a @2 M g9 ~8 s- J4 v* b | | [ ] DaVinci 644x based system | |
' Y' z) c! s9 v4 Z6 Q | | [ ] DaVinci 355 based system | |0 X r9 m* |5 ]! G& W4 ^2 d
| | [ ] DaVinci 646x based system | |
4 Q7 g2 E* Q; W* S+ U0 k& m) [, g! \ | | [ ] DA830/OMAP-L137/AM17x based system | |
5 f' Q% P0 w& G | | [*] DA850/OMAP-L138/AM18x based system | |
- K5 V8 I5 z# P | | [ ] Enable UART1 flow control | |
9 q: m# o. c! j/ x | | [ ] Enable UART0 RS485 funcation | |
7 r5 N* i% o( q- F& z | | [*] Enable UART1 RS485 funcation
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0 e* g2 {" O* f5 i0 f% A0 R- R想了解详细的功能实现，也可以查看8250.c文件里面的；" i* ~+ G, x& F, P# C" U' L$ U B+ f
void serial8250_tx_chars(struct uart_8250_port *up)
3 u" l7 m7 M0 n; r7 a* O return;
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+ w( K: \! R7 y J% a7 \# q
+#if 19 ^/ L6 c1 \, X: k5 s/ Q
+ /* The funcation with RS485 flow control */
; Y/ a8 d: m0 h% b) V( j8 c+ if (up->port.private_data) {
$ t6 E. R- ^' I6 c9 ?+ struct serial8250_flow_ctrl *flow_ctrl_p;
% M+ R4 \$ j# E8 u& v+ flow_ctrl_p = up->port.private_data;! l$ Z" F# C8 R }) C, V7 }
+. H/ ]( ?- `7 w% o$ G1 b+ U) J
+ if (flow_ctrl_p->gpio) {
h; Z7 K8 t7 ~, H" A( i- s; x+ gpio_set_value(flow_ctrl_p->gpio, 1);- V2 z3 C9 c I% g0 ^
+ ndelay(50); /* Propagation delay >= 50ns */
4 a( `/ Y; L: D. F4 ?* W4 e+ }
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+#endif
% s) q. v4 q5 d3 x; z2 V& i希望对您有帮助。
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发表于 2014-10-31 17:01:26
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