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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( i) [% `8 A3 B! K *** DaVinci Core Type *** | |8 X# s. R2 w% |
| | [ ] DaVinci 644x based system | |
2 A0 [! B! t. ~* B | | [ ] DaVinci 355 based system | |
" k4 ?/ \, i% W& M: k% m | | [ ] DaVinci 646x based system | |
9 ^9 x- m& N1 P( m | | [ ] DA830/OMAP-L137/AM17x based system | |/ U/ t. b0 ~0 `" v# y$ O
| | [*] DA850/OMAP-L138/AM18x based system | |7 I- c% d, S4 a s
| | [ ] Enable UART1 flow control | |* M0 [1 O6 q7 e1 C7 X% T3 o
| | [ ] Enable UART0 RS485 funcation | |) F, u8 ?- y3 s
| | [*] Enable UART1 RS485 funcation 7 x" s: g" U9 v T g/ x- \
9 ], |" Q1 w& g" I$ x想了解详细的功能实现,也可以查看8250.c文件里面的;
: E6 Y+ D6 h, @( g0 R5 Dvoid serial8250_tx_chars(struct uart_8250_port *up)8 `2 A3 U6 v) }7 U# T
return;
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; v1 g: u( Z7 v8 r/ l* g" b. M. r+#if 1
" @9 J7 O* y+ d0 V# w: E. ^+ /* The funcation with RS485 flow control */
* e |6 I2 q* E2 j# L$ P+ if (up->port.private_data) {
4 |( m. G( v9 n$ _ b& ]; K+ struct serial8250_flow_ctrl *flow_ctrl_p;
: y' y: Y" S% S* u! b9 o( S0 M% t+ flow_ctrl_p = up->port.private_data;/ Y% [7 \9 C3 N& s$ c" X" V
+8 m, A3 a. u) p( u
+ if (flow_ctrl_p->gpio) {
i7 k5 g6 l3 e, H+ gpio_set_value(flow_ctrl_p->gpio, 1);
# ^) t" o% K! ~8 h% q5 }( G$ I" O+ ndelay(50); /* Propagation delay >= 50ns */% G4 z' Y1 }% a+ u) Z* w6 W
+ }
5 {4 K% u& X2 }/ d5 q+ }
0 u# H9 t. p+ {* [+#endif. i( W; i5 `( K# U; `8 c; y* v; T
希望对您有帮助。- v" {' d$ X+ v) R m3 y0 ^
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