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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。 Q" G! ]5 X1 _+ b! y! g- P7 v
*** DaVinci Core Type *** | |
+ i7 Y* o( a# u9 o+ A$ o( ^1 v4 C | | [ ] DaVinci 644x based system | |
4 t% Y, ?5 W/ g9 d: q+ T' G | | [ ] DaVinci 355 based system | |/ }8 Y2 I$ K2 x
| | [ ] DaVinci 646x based system | |1 V5 @$ [4 y8 \1 s7 W
| | [ ] DA830/OMAP-L137/AM17x based system | |/ ^- x. L! i5 p. ?1 Q
| | [*] DA850/OMAP-L138/AM18x based system | |
% \' |( K* m) ?2 D+ O | | [ ] Enable UART1 flow control | |* y, I/ ]& Z6 D* A
| | [ ] Enable UART0 RS485 funcation | |
6 p+ ], k- ~, B, B+ m | | [*] Enable UART1 RS485 funcation . Z5 ?6 ~* {4 P" w
5 O/ j0 ^% b! l& [9 c想了解详细的功能实现,也可以查看8250.c文件里面的;
5 N; c/ S) H4 R% j ]void serial8250_tx_chars(struct uart_8250_port *up)
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+#if 1) z B Q& i6 `2 \
+ /* The funcation with RS485 flow control */
$ ]* O! {5 q+ D8 `' b( p+ if (up->port.private_data) {4 H, f, `+ R8 {) L
+ struct serial8250_flow_ctrl *flow_ctrl_p;
/ N5 R; y& n) \) j; t, l+ flow_ctrl_p = up->port.private_data;6 g+ [* ]4 i1 P) Q: |" K( I0 a
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+ if (flow_ctrl_p->gpio) {4 M2 k( { e' ^$ `8 e9 e
+ gpio_set_value(flow_ctrl_p->gpio, 1);
7 P9 l( I: f1 I" F; I( M7 {% J! F+ ndelay(50); /* Propagation delay >= 50ns */
% [# Q& F* b9 x5 X2 d+ }
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1 ]3 e) [' W9 @$ U6 ]+#endif
6 u- G. L9 ?* G. M# I) P( ]希望对您有帮助。' _# A z7 j$ e9 J
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