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寄存器初始化那里就给出来了啊,如果DSP要发数据给FPGA, 那么CLOCK是由DSP去控制的,如果DSP要接收FPGA的数据,则CLOCK是由FPGA控制的,START跟ENABLE信号是用来控制发送使能的。这是我的初始化配置(我是用8位宽度通信的,对于DSP来说,B是发送,A是接收):$ |- b' ?$ K# j; Q, `
static void UPPInit(void)
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unsigned int temp_reg = 0;# G) w% r: H7 q. D1 f6 k
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// Channel B params/ Y s' _+ i$ B) s3 P1 w8 k
CSL_FINST(temp_reg, UPP_UPCTL_DPFB, LJZF); //Left-justified, zero filled
* r6 ^4 R, }4 L( n: T& G2 {2 ` CSL_FINST(temp_reg, UPP_UPCTL_IWB, 8BIT); //8-bit interface( ^9 k% G* T( o- `1 ~
CSL_FINST(temp_reg, UPP_UPCTL_DPWB, FULL); //Channel B bit width = 8$ _. f6 r& U4 i1 w4 T9 M
CSL_FINST(temp_reg, UPP_UPCTL_DRB, SINGLE); //Single data rate
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. t! d, |7 G& a5 W* u // Channel A params
0 h$ v6 e) F, X' k; o1 G" s CSL_FINST(temp_reg, UPP_UPCTL_DPFA, LJZF); //Left-justified, zero filled# k X8 O. J1 g5 \2 H# `& G
CSL_FINST(temp_reg, UPP_UPCTL_IWA, 8BIT); //8-bit interface& y. T/ k' j# Z0 w9 ~; l% T, G
CSL_FINST(temp_reg, UPP_UPCTL_DPWA, FULL); //Channel A bit width = 8( I* Z* K0 C1 q$ ^5 D( h5 U
CSL_FINST(temp_reg, UPP_UPCTL_DRA, SINGLE); //Single data rate* p. v4 |# ?+ o8 H) u- b& A) k0 I
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CSL_FINST(temp_reg, UPP_UPCTL_CHN, TWO); //Channel A and Channel B are both active.
r& m- p4 d9 r$ g$ o CSL_FINST(temp_reg, UPP_UPCTL_MODE, DUPLEX0); //Channel B transmit Channel A receive
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upp_reg_hdl->UPCTL = temp_reg;
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5 S! P9 F7 j* A* G9 S, V- o temp_reg = 0;
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// Channel A params# W5 ^5 V* e; B5 z$ A! `1 }
//CSL_FINST(temp_reg, UPP_UPICR_TRISA, ENABLE); //Channel A data pins are in a high-impedance state while idle
) G R# B6 ~% u' R. ] //CSL_FINS(temp_reg, UPP_UPICR_CLKDIVA, UPP_CLOCK_DIV); //Clock divisor8 }/ Z2 e* _5 n) G
CSL_FINST(temp_reg, UPP_UPICR_STARTA, ENABLE); //Channel A START Signal Enable.6 V# n5 Y0 X; a3 ^1 ~
CSL_FINST(temp_reg, UPP_UPICR_ENAA, ENABLE); //Channel A ENABLE Signal Enable
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// Channel B params" X7 q0 b' d" n9 E
CSL_FINS(temp_reg, UPP_UPICR_CLKDIVB, UPP_CLOCK_DIV);
0 m6 n9 m2 X! S; U3 g+ v3 B CSL_FINST(temp_reg, UPP_UPICR_STARTB, ENABLE); //Channel B START Signal Enable.- U- @; q& l7 Z& h# q
CSL_FINST(temp_reg, UPP_UPICR_ENAB, ENABLE); //Channel B ENABLE Signal Enable
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8 Q! v3 I W v8 M+ f, B upp_reg_hdl->UPICR = temp_reg;; ]2 O) ~9 m- u: n V+ x
: u/ K; p% C% S& _8 l1 N. }' @2 P" Q //temp_reg = 0;
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% ^- f$ g; [0 N" k" b6 e. a //CSL_FINS(temp_reg, UPP_UPIVR_VALB, 0x7b7b); //Channel B idle value# w+ X6 t6 o( j& \/ W* D
//CSL_FINS(temp_reg, UPP_UPIVR_VALA, 0x7f7f); //Channel A idle value
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1 Q% T+ o \ H1 T //upp_reg_hdl->UPIVR = temp_reg;1 w. @& C$ T. S- \! c
A$ F* }( q' N& w% M* C* Q //temp_reg = 0;
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. T/ E% H2 Y6 {. v //CSL_FINST(temp_reg, UPP_UPTCR_RDSIZEI, 256B); //set 256B DMA I
6 j& Z5 |# h1 c) s" z2 R: d* X6 g //upp_reg_hdl->UPTCR = temp_reg;8 Q- t J( { E5 }% F2 S" O8 p/ u
/ \5 x& ?( B! V9 F //temp_reg = 0;
* t, o3 H7 U" Z1 x //CSL_FINST(temp_reg, UPP_UPDLB_BA, ENABLE); //B to A loopback mode enable P$ c* B; [9 V3 `6 e2 m
//upp_reg_hdl->UPDLB = temp_reg;
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