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vivado上的AXI和AXI_DMA

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发表于 2019-4-15 11:35 | 显示全部楼层 |阅读模式
本帖最后由 kenson 于 2019-4-15 11:41 编辑
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3 o3 \! K. o; B5 I: F) p8 N AXI_Diagram.png
+ a- B6 v6 M9 F9 C; ? DMA_Diagram.png 0 X! w7 B6 ?2 t' \! w6 E
研究了一下vivado上的AXI和AXI DMA 之间的区别,ZYNQ上的CPU是带有AXI GP 和AXI HP 两种AXI总线,但它们是100%要经过AXI_INTERCONNECT 作为中介。
. k" p# N* ?% e; J$ C$ ^CPU不能直接连接到AXI从设备上,而DMA也是要配合AXI总线一起使用,所以从图二上看DMA是直接对内存访问,但AXI又链接到LITE上,那CPU也可以参予其中。
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 楼主| 发表于 2019-4-15 11:38 | 显示全部楼层
了解DMA对大数据处理相当有用,以前只了解下DMA,但没用过,今天可以拿点时间研究一下。
 楼主| 发表于 2019-4-15 12:09 | 显示全部楼层
本帖最后由 kenson 于 2019-4-15 12:11 编辑 * }* B" T! I' _7 t4 [3 e

/ j+ y; p9 s) T" h$ E# l DMA1.png
) O* ~# ^; ?9 z7 V; } DMA.jpg
2 f' [. |2 w3 F! X& f使用DMA当然也要FIFO陪同,不然达不到效果和出现问题
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 楼主| 发表于 2019-4-15 13:16 | 显示全部楼层
my_DMA.png
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 楼主| 发表于 2019-4-15 14:20 | 显示全部楼层
xaxidma_example_sg_poll.txt (18.92 KB, 下载次数: 85) - y$ W# V( G1 {% M
9 ]  w( r6 W$ A9 c/ g% J
源码
5 y7 i& d$ s/ Z7 t2 E( m
) e" i- K0 C, P6 b( I/******************************************************************************- l" @, M$ I4 |9 G" C
*
/ d' o* d( D' H% H" s! C4 |* Copyright (C) 2010 - 2018 Xilinx, Inc.  All rights reserved.
! B1 \. k/ Q8 U" y& X*8 `  g/ I9 Y) @9 R
* Permission is hereby granted, free of charge, to any person obtaining a copy  M; {  {) B$ _, E
* of this software and associated documentation files (the "Software"), to deal
" }; t: j, w  N3 R8 D% v6 T. @: o  J3 g: }* in the Software without restriction, including without limitation the rights% R6 C8 M& o3 N6 J. Y2 M3 U' H+ _9 Z
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell4 }' l# I, @: f& }
* copies of the Software, and to permit persons to whom the Software is8 F, t% L& X' K& ~# k0 ^* f+ J
* furnished to do so, subject to the following conditions:
# E" n" F# |" ^5 [*; o1 o+ _) d) y+ A# }
* The above copyright notice and this permission notice shall be included in: T8 S; d: J  {+ U4 z
* all copies or substantial portions of the Software.9 ~: h3 A) R7 i# B( A9 m- k
*) t2 o8 c5 |3 v" b2 |: q8 A5 [
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
; E) u( J( a& f5 ?* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0 i& c% v5 L8 Y* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL8 `1 h1 x5 j) W+ H
* XILINX  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,: r' h& C. N$ r2 m0 _3 T+ z
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
- q- P6 r  b2 }$ o* Y* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
6 e" p. N( Y# f, ~* SOFTWARE.
; ?" [- H* }2 I0 ?*% @$ I( }0 e. ?7 I, ?* `; z
* Except as contained in this notice, the name of the Xilinx shall not be used
0 e4 \6 p% i3 c2 W/ ^* in advertising or otherwise to promote the sale, use or other dealings in1 v8 K# Q' u+ m7 T
* this Software without prior written authorization from Xilinx.( d3 y! W$ A8 E! v5 s
*
8 H. O- H- [# p9 n# |0 y5 l) @******************************************************************************/
2 u) K# E) Y; |4 Z/*****************************************************************************/1 v- y/ b" `& r6 r5 @  l' K& v
/*** s# N2 A" ]: T4 n! s3 v
*/ t; z6 j; P, a
* @file xaxidma_example_sg_poll.c
: S; Q) `) V7 Q0 w *
' P0 o# U- {9 s6 u/ j" g * This file demonstrates how to use the xaxidma driver on the Xilinx AXI
# H  }; M' s+ T" b9 n8 i# Z$ C * DMA core (AXIDMA) to transfer packets in polling mode when the AXIDMA
; y" g7 p& n6 e' U * core is configured in Scatter Gather Mode., v# H- B% M5 Y! @, U- B2 R$ X
*- {7 a. s2 B0 Z* i
* This code assumes a loopback hardware widget is connected to the AXI DMA
4 y' N. o# h  y# A& } * core for data packet loopback.& M+ R6 W; K4 c5 D
*
8 X5 Y0 L& a. F& D% ?3 v6 q! D0 Z * To see the debug print, you need a Uart16550 or uartlite in your system,
$ @! R) x  T7 K/ x  S' I * and please set "-DDEBUG" in your compiler options. You need to rebuild your
' @8 p1 ~" A# |  I * software executable., W7 {2 {6 _( v- r- S3 K+ L& J' F9 K
*
9 m' J: ~3 x5 G( n' y * Make sure that MEMORY_BASE is defined properly as per the HW system. The
5 H4 `8 H) K: H * h/w system built in Area mode has a maximum DDR memory limit of 64MB. In
3 C5 h0 l$ s0 U) z * throughput mode, it is 512MB.  These limits are need to ensured for6 h. W! {/ R6 |: g3 h
* proper operation of this code.
% z# \$ \2 H6 W2 k" {) k+ Z2 @ *
/ y* o$ c' g" A$ f *
2 w/ @$ {$ E1 c4 x: `/ k4 e * <pre>
7 `4 l2 ]4 H& k# b* V * MODIFICATION HISTORY:1 M. p, G) c# i* P7 ?
*; V. w/ T# \9 T( Z+ ?
* Ver   Who  Date     Changes
5 O# D- N/ h. T * ----- ---- -------- -------------------------------------------------------  i- l9 i  T' Q0 r* `
* 1.00a jz   05/17/10 First release$ I0 y  U. d4 A  V) |
* 2.00a jz   08/10/10 Second release, added in xaxidma_g.c, xaxidma_sinit.c,
: r+ u3 C! Z  W& l: c. z *                     updated tcl file, added xaxidma_porting_guide.h, removed
( P' s- K7 D+ k2 Y' g *                     workaround for endianness$ _0 U7 _1 C2 k% b- x
* 4.00a rkv  02/22/11 Name of the file has been changed for naming consistency
. w- t2 O1 s; o1 h- k *                                 Added interrupt support for ARM.
' I& _- H2 _4 V+ G# n, g * 5.00a srt  03/05/12 Added Flushing and Invalidation of Caches to fix CRs
, j6 \! |6 }" p' z1 o; \ *                                          648103, 648701." R0 b0 ^2 l& j; V; o2 d, r# t8 }7 A
*                                          Added V7 DDR Base Address to fix CR 649405.( a5 X2 h& `- H+ f4 S- _9 {4 m
* 6.00a srt  03/27/12 Changed API calls to support MCDMA driver.
+ ]& e+ }% t- {1 o * 7.00a srt  06/18/12 API calls are reverted back for backward compatibility.) z1 ], H3 Q3 J3 B; F, i# ~& ]
* 7.01a srt  11/02/12 Buffer sizes (Tx and Rx) are modified to meet maximum
1 ^9 [( l  @' [6 n* ?' ~; d *                       DDR memory limit of the h/w system built with Area mode
5 z- e  X! [: a, G/ u' | * 7.02a srt  03/01/13 Updated DDR base address for IPI designs (CR 703656).4 M: j, c3 q  N
* 9.1   adk  01/07/16 Updated DDR base address for Ultrascale (CR 799532) and3 {% j6 Y- z# I9 H+ [
*                       removed the defines for S6/V6.
! |; X% w* |8 ]+ ^8 k * 9.2   vak  15/04/16 Fixed compilation warnings in th example- B: A9 I; |+ o- i. b) [: z
* 9.3   ms   01/23/17 Modified xil_printf statement in main function to
. ^$ ^; Z# {" k! F *                     ensure that "Successfully ran" and "Failed" strings are2 O9 p5 A& t' W( R6 `+ F3 X$ S
*                     available in all examples. This is a fix for CR-965028.
" L% ?; D/ ]: J: a7 a: O, G* T8 S * </pre>
* Z2 s  l4 w$ b- L- m& T4 }( ] *" c+ g. \- v1 Q, b4 d; p- W3 O
* ***************************************************************************
5 h4 |" ]" p  h1 S  |$ C */3 Q/ |) ]  F; _' m6 K
/***************************** Include Files *********************************/
1 f" a3 B1 J4 N, C" s9 Q" }#include "xaxidma.h"
" ]! T  E+ @( ]# t4 U/ T; h#include "xparameters.h"$ M4 z8 n% }" U7 T6 i3 A! w
#include "xdebug.h"0 L0 d: u3 s4 n' G

6 M0 J1 C# N0 y& f  ^3 c* H% s% P#ifdef __aarch64__& U' m  r6 a4 S8 ~$ w0 W6 Z4 \" d! t
#include "xil_mmu.h"( `: @* \* J+ d: J" ^
#endif" t% X" G2 }- D  d  t
# b$ K' S3 U( d4 L6 `
#if defined(XPAR_UARTNS550_0_BASEADDR)
0 _( E- C8 q: Z5 o3 N$ w2 a#include "xuartns550_l.h"       /* to use uartns550 */
+ Y* L8 q  v( [) W, Y! M% r#endif# c* ]! W3 D3 ^3 V0 W

& N- V3 w  [. \/ r5 u$ k. |) M! V' p#if (!defined(DEBUG))
: l# v6 N  v5 I7 E6 mextern void xil_printf(const char *format, ...);& E. i* }3 c9 g9 [: {3 D
#endif1 E% g' d3 Z% R
. y' u% g9 j/ z# n( r) E
/******************** Constant Definitions **********************************/
& X- `$ e+ ^0 [1 D, J; G& w8 ]! w5 g) S% H. V
/*7 V7 O- B' J4 c$ X6 x- n
* Device hardware build related constants.1 l+ g2 b0 ^2 E; f) v
*/
' |8 {; ?" H0 }" v) i- d: O# G! d. n; z
#define DMA_DEV_ID                XPAR_AXIDMA_0_DEVICE_ID6 g; e* D* C9 I& K. P" Y, p
3 U( N# k" ]5 R, K2 Q
#ifdef XPAR_AXI_7SDDR_0_S_AXI_BASEADDR& M4 e# k' P7 d8 h* w1 I* A
#define DDR_BASE_ADDR                XPAR_AXI_7SDDR_0_S_AXI_BASEADDR) B7 [. T" J* n- H. L
#elif XPAR_MIG7SERIES_0_BASEADDR5 w7 b6 n1 h& L8 Q+ _  r
#define DDR_BASE_ADDR        XPAR_MIG7SERIES_0_BASEADDR  X1 I5 H8 B8 X5 s* H. n; o" V7 }5 |# j
#elif XPAR_MIG_0_BASEADDR
; m( U0 U+ n/ R* D1 A, t  y#define DDR_BASE_ADDR        XPAR_MIG_0_BASEADDR
3 Y1 j5 p2 o& `#elif XPAR_PSU_DDR_0_S_AXI_BASEADDR6 E" C- m7 z/ o! @6 z$ S8 W% n! f' T
#define DDR_BASE_ADDR        XPAR_PSU_DDR_0_S_AXI_BASEADDR" S+ @( H. G( |" O. u
#endif
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$ z; L: }6 P% x% |1 t) H  q, @  E#ifndef DDR_BASE_ADDR2 ^& ~4 z! d. ^2 h+ U$ c4 r* `
#warning CHECK FOR THE VALID DDR ADDRESS IN XPARAMETERS.H, \4 M& V, |% r8 D' v) f* L
                        DEFAULT SET TO 0x01000000
8 x( m& H3 N7 }#define MEM_BASE_ADDR                0x010000000 h% A/ e" b  x0 c- c
#else
1 i4 n$ _7 [, ?#define MEM_BASE_ADDR                (DDR_BASE_ADDR + 0x1000000)4 z3 k, U; o: C
#endif
# m5 X) |0 Y7 @! l7 \9 x) C6 d) z. N* o& b! J
#define TX_BD_SPACE_BASE        (MEM_BASE_ADDR)
8 f1 Y! ]5 [+ E( T, m& m#define TX_BD_SPACE_HIGH        (MEM_BASE_ADDR + 0x00000FFF)( }0 ?/ V7 k/ o2 e% K1 I
#define RX_BD_SPACE_BASE        (MEM_BASE_ADDR + 0x00001000)/ F( Q: y* Z+ R, O; W4 y' d
#define RX_BD_SPACE_HIGH        (MEM_BASE_ADDR + 0x00001FFF)' P. h; G7 f* S7 t, R4 d& q
#define TX_BUFFER_BASE                (MEM_BASE_ADDR + 0x00100000)( L" x. m/ D4 R6 E
#define RX_BUFFER_BASE                (MEM_BASE_ADDR + 0x00300000)0 ~/ E6 ^& E2 d6 x3 y1 }4 H. V  f
#define RX_BUFFER_HIGH                (MEM_BASE_ADDR + 0x004FFFFF)+ E$ H3 c. L* B4 Z2 @; m

0 H. b% R: J% `' J3 O0 o; ], a+ w( j0 a) x( l3 Q) H
#define MAX_PKT_LEN                0x208 V; Q! C, ~0 L4 g
#define MARK_UNCACHEABLE        0x701
% X: H; G) @0 S& A( |' ?( o# q* A1 b; `& A4 Z1 t. E
#define TEST_START_VALUE        0xC
! |7 @# t4 x/ Q: ^; R& [0 e
# o' L) ]9 b( Z' p2 g2 h/**************************** Type Definitions *******************************/
$ {; E% d/ Z! i+ v( u1 j+ T# Y% ~- A8 a3 ~

" U: y/ m; I0 w, M( u# B- i: ]/***************** Macros (Inline Functions) Definitions *********************/4 C# |( x/ F8 j
4 ]: v/ D) h- N) A4 I: R

( N9 t4 s0 w' X/ B6 `$ |' h/************************** Function Prototypes ******************************/
" G, l: q6 H8 ^$ r+ E/ b#if defined(XPAR_UARTNS550_0_BASEADDR)- L# ~1 y) A; V4 i, D: W3 L
static void Uart550_Setup(void);8 s  K( h) Y. G) Y* c
#endif
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static int RxSetup(XAxiDma * AxiDmaInstPtr);( u3 r- a0 c# i2 D$ T& l0 d1 G5 \
static int TxSetup(XAxiDma * AxiDmaInstPtr);5 Z9 F' Y7 w2 W9 O* Z/ I
static int SendPacket(XAxiDma * AxiDmaInstPtr);; p* r1 \, J& A3 `& G
static int CheckData(void);% B" ~& m3 [3 k' w7 e) ^
static int CheckDmaResult(XAxiDma * AxiDmaInstPtr);
: ~' Z  M: ?& S9 \1 ~1 Q- w( g. U% m# o% Q5 U
/************************** Variable Definitions *****************************/
1 V7 q) M4 D" w& C/*, W' L6 \- j/ I: l9 k
* Device instance definitions/ a% q7 h5 N- ?9 Y
*/  ~3 r& h% {5 E" E! c3 S  j2 f
XAxiDma AxiDma;" K- b6 [2 n8 y" T* W! A. \# w4 ~
- W/ Y* H% T9 u5 ?4 ]
/*" x9 j! i6 U: Y( h/ s
* Buffer for transmit packet. Must be 32-bit aligned to be used by DMA.
  O- u% [; p0 L, L */% [; ^( V5 g' a8 R- ~$ H3 K
u32 *Packet = (u32 *) TX_BUFFER_BASE;/ i; _% p! x( {8 {2 t* C3 G) a
, i( }8 D1 M$ a$ Q: w
/*****************************************************************************/
- n, T, Q" F% J1 f) E6 p/**5 q& ~3 _4 D, {
*  T3 H$ J% i+ {
* Main function6 Z1 l8 J& o' x" O) U
*. A& s0 [$ J+ h+ w8 ?9 T: ?
* This function is the main entry of the tests on DMA core. It sets up7 [& J/ W# g% L6 f5 d
* DMA engine to be ready to receive and send packets, then a packet is# T) |6 P2 `* X" l% N
* transmitted and will be verified after it is received via the DMA loopback+ F/ w7 {5 h  y' l% c3 R  s
* widget.% p% @9 e3 D* y: {* }0 s* S9 l: |* Z. k
*
! _4 L7 T# {; u6 F3 V# o* @param        None6 z/ f% G" S- `& t5 W
*6 Z! t. y1 V5 p) s6 W
* @return
5 b( W* Q7 q1 y8 ?, S; I*                - XST_SUCCESS if test passes+ t% m: N( R' D) F9 g4 i
*                - XST_FAILURE if test fails.
/ E( P5 }& K0 f& D*
) M: u2 v% h6 A/ K( q" J, {* @note                None.
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******************************************************************************/
. G9 ^3 `: H) p5 }1 H8 [int main(void). a8 g* F0 e/ O- s; J
{
) a7 a  `) H" V        int Status;4 S( `7 o: ]; |9 c# W9 U. J5 l3 |
        XAxiDma_Config *Config;% A" t, z* l0 K- d4 o# P5 w: K5 _

" A2 V" e3 ~+ I+ B" j#if defined(XPAR_UARTNS550_0_BASEADDR)# H  m# a2 _6 S* t. p
/ f4 m" Y- Y% X  X" ^" L
        Uart550_Setup();2 S3 ~  R, A( t  S! g  L3 E- U
+ Y+ a+ J7 }% p/ e3 C
#endif
6 h5 {- n/ F( ^4 f) ^4 F$ K8 w% A: ^
        xil_printf("\r\n--- Entering main() --- \r\n");+ K4 m% G1 G' [3 K- X9 a
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#ifdef __aarch64__. }+ w" o9 y# \& r( n
        Xil_SetTlbAttributes(TX_BD_SPACE_BASE, MARK_UNCACHEABLE);
1 Z) c/ y% `6 s        Xil_SetTlbAttributes(RX_BD_SPACE_BASE, MARK_UNCACHEABLE);
6 Q( |8 S8 h( R' k: A& ^# b#endif0 U1 Y" E4 l; l; Z  M7 m# O* O1 n

+ K. P9 X/ |' Q: }) g7 B# W        Config = XAxiDma_LookupConfig(DMA_DEV_ID);2 x/ R# L0 T3 M% R. v
        if (!Config) {0 f* i0 ^0 O( I  u: @. `
                xil_printf("No config found for %d\r\n", DMA_DEV_ID);$ K9 q1 z0 m# B" ?
- b& n8 y! M) n* x! p
                return XST_FAILURE;
+ G* z9 Z/ Y: ]5 N/ b        }1 h/ ]# m( T' c+ s5 ?

' x$ G3 l1 ?& _0 h3 l! w* l' I7 W        /* Initialize DMA engine */
* y- p4 p! P! g" Z7 m0 }& |( }        Status = XAxiDma_CfgInitialize(&AxiDma, Config);
! o/ Z/ O9 j# m* S        if (Status != XST_SUCCESS) {
7 `9 s. A( ^/ Q+ }8 V+ X                xil_printf("Initialization failed %d\r\n", Status);1 r8 c  w# O( g0 j9 |
                return XST_FAILURE;$ G8 D- _; V5 a3 N  ]/ R: R# u: A* W6 |
        }
% G/ t: V9 I$ F* G1 Y
1 l  t- l& K3 N. r. Z        if(!XAxiDma_HasSg(&AxiDma)) {
' E2 o1 o  W4 b. N$ W/ I& \  o                xil_printf("Device configured as Simple mode \r\n");
0 h/ X& F& `0 G7 m, E5 E* Q  U2 P. e2 V$ i; z$ b& P
                return XST_FAILURE;
- D/ Z9 e5 x# h0 |        }" d0 S5 A* B3 l2 J
: I0 N! L5 q) m# E9 S1 P0 p. P9 K
        Status = TxSetup(&AxiDma);1 X  ~! o8 e/ J- \$ @% ?+ v$ h4 h
        if (Status != XST_SUCCESS) {
9 x: ~9 p6 y, s( Z" @3 |                return XST_FAILURE;
6 x! v+ U6 l, X5 H0 ~- _3 i        }& e0 x* L7 K4 S+ Y& s' p7 W7 |5 |5 a6 N
4 W  P$ v4 g0 X" e+ F3 C; z
        Status = RxSetup(&AxiDma);  C8 k( {, ~% l" X
        if (Status != XST_SUCCESS) {
( G! a' e  S0 N% o, O+ S/ U                return XST_FAILURE;* N6 O6 N, H  R, t
        }/ q. N" L, t2 o, m- I* K% Y

4 M5 b9 k" r, }( C5 V        /* Send a packet */+ f+ ^! Y: e. Z  W) h
        Status = SendPacket(&AxiDma);0 ?6 b1 p5 A0 c& ]8 B
        if (Status != XST_SUCCESS) {
* k# v2 H/ a) o5 O3 c" s6 c* }                return XST_FAILURE;7 j2 S* v+ t1 j
        }
3 c: ^. d* Z7 x9 U- a
/ y. Z/ u# Z  J- B0 v- M) b3 ^        /* Check DMA transfer result */
, O, G, x5 |' d! m  ?' y# s! m& e% D        Status = CheckDmaResult(&AxiDma);
+ ]4 h% d% w5 w$ m5 c' N! H- N2 E& C1 v3 B2 u. i0 Q- G
        if (Status != XST_SUCCESS) {
$ y& g4 u+ _8 K+ L+ N3 @* U* V7 {; R                xil_printf("AXI DMA SG Polling Example Failed\r\n");' K6 E2 u6 d( {. O
                return XST_FAILURE;, D' W% A& H; r7 s; S0 G
        }. B5 {1 d9 ~  V7 u+ N( y4 B
0 f4 Z7 j/ E2 t$ X' ?
        xil_printf("Successfully ran AXI DMA SG Polling Example\r\n");
4 |- {- m, p2 i6 r/ o/ U        xil_printf("--- Exiting main() --- \r\n");* }- @$ m/ z! c( z/ ~

0 y) K6 e7 A* L3 Y9 S) `" R7 _        if (Status != XST_SUCCESS) {
, t+ Z) r2 n0 O' d# [" v                return XST_FAILURE;
. v5 |; @; }7 H- b# a        }+ R8 }% t3 \# G% W
& q, ?9 U8 @# q7 K+ W
        return XST_SUCCESS;! y) b) d1 W  F$ I
}; o- N  }6 n* K$ [

( t6 i9 ^: C7 P/ W. r#if defined(XPAR_UARTNS550_0_BASEADDR)5 z" q' B( m0 u0 E
/*****************************************************************************/
- }8 c, v0 r( `- O! C/ b7 i0 d( @/*. [& h. \" ^, S: g$ r* X; E% S: m
*
9 \# {# s$ p  ~( n/ {5 W* Uart16550 setup routine, need to set baudrate to 9600, and data bits to 89 X% j' b2 C' x& i& C4 W! g
*
" b/ m, }9 `: v  h$ i3 V* @param        None% i; Y7 s$ U" N- M% ]+ U
*4 q7 {. v, S% U; Y* x! F
* @return        None
+ `& j6 o! p( i% f*. Q, ?0 t7 b/ y/ U) |4 S& t
* @note                None./ c. j* j* s# O, ?* r! S! O
*) r: i. F$ C! @2 v$ o
******************************************************************************/8 [! _. t: P7 Z
static void Uart550_Setup(void)" @5 P+ O- U# @8 Q
{
$ M* E1 u7 Q- P4 B1 N  H4 [% a7 P8 K, M5 O( X7 D9 n( _$ x
        /* Set the baudrate to be predictable* u* H" {, ]5 F. o' o, o
         */  \# a% L, j) C+ Q- b. ?
        XUartNs550_SetBaud(XPAR_UARTNS550_0_BASEADDR,; B' P2 B5 X+ V
                        XPAR_XUARTNS550_CLOCK_HZ, 9600);- t3 w* r0 U- h9 V$ U* e

2 V2 L' I8 C( }+ S6 o( b        XUartNs550_SetLineControlReg(XPAR_UARTNS550_0_BASEADDR,& [) R* P6 h& G- _/ ?: z2 N
                        XUN_LCR_8_DATA_BITS);
; E1 ]% d( S! U/ s& V9 m9 W
1 k1 J4 Q0 f/ ]}
  S# r% j" u- y) h# w  R' v#endif
2 e1 x8 e. H1 Z2 C6 o+ b( z" S8 h6 a1 X- Z
/*****************************************************************************/& M* _3 X  a+ g, {( q
/**
# c! z. f6 q) v2 [*
+ M$ v5 B: ^( E/ j- C* This function sets up RX channel of the DMA engine to be ready for packet2 D' E, |- H+ @/ I) D6 _  X
* reception
; `2 X7 S! d& X/ U  M: g. J7 n*
  \, n( L. W0 |% Q3 g( y# P* @param        AxiDmaInstPtr is the pointer to the instance of the DMA engine.. q$ B" `! W$ E9 d) a4 A5 o- U# b
*4 ~0 T: x7 t7 o8 {& h( B
* @return        XST_SUCCESS if the setup is successful, XST_FAILURE otherwise.: l# X: }) w7 u% N; `5 m1 _. x
*
8 \; J1 [2 {) M! l* @note                None.
& O  T8 H0 I& D" j8 \( `*
9 L9 s3 s( e5 N& S/ W" S******************************************************************************/
' ~3 O3 G. k* P" }- gstatic int RxSetup(XAxiDma * AxiDmaInstPtr), P) w/ ^* H5 ~- I% O
{
! C, q9 E2 D3 x: E        XAxiDma_BdRing *RxRingPtr;: S3 }7 Q9 x: l* L4 b6 j
        int Delay = 0;! U# L: y  d, L& B; a! W. i1 z
        int Coalesce = 1;+ ~& q& f# r; i" C" k  u7 F
        int Status;
9 k% c  [. _4 G9 n: j        XAxiDma_Bd BdTemplate;
6 \  u/ |  n" {( {- S& U7 I% t        XAxiDma_Bd *BdPtr;, E* N" N2 Y! i5 E# R6 b
        XAxiDma_Bd *BdCurPtr;, s! @" k; Z% m  b/ n" v- f
        u32 BdCount;
# k0 e/ j0 Q5 ^0 f) P        u32 FreeBdCount;
5 D* G& l7 J, i! l- n3 r        UINTPTR RxBufferPtr;. ?  X/ V. B. ]6 [$ M' w
        int Index;
+ t' [. ~+ i: G  ?: n% g5 y/ K
0 ^; N( b9 n% h: E! i/ G& f& D        RxRingPtr = XAxiDma_GetRxRing(&AxiDma);' Q! w$ K5 H: ]$ l' `
2 D1 [2 d0 h9 D. I" o# D5 K8 [
        /* Disable all RX interrupts before RxBD space setup */4 d. |$ N7 r3 e& A
. V1 G& K8 {+ ~, U$ b( m# c" ^6 p
        XAxiDma_BdRingIntDisable(RxRingPtr, XAXIDMA_IRQ_ALL_MASK);$ J: @0 V; q* _

9 X+ C, i2 m8 Y        /* Set delay and coalescing */
1 ^% {6 t3 N3 N3 H& C9 ^, I        XAxiDma_BdRingSetCoalesce(RxRingPtr, Coalesce, Delay);3 O' K9 Y8 c' d2 Y0 X

0 ~& L& ~* n7 ]# U+ m# g        /* Setup Rx BD space */4 b! t  h) v2 w6 b! I
        BdCount = XAxiDma_BdRingCntCalc(XAXIDMA_BD_MINIMUM_ALIGNMENT,) a! g; J6 d* M) u; c
                                RX_BD_SPACE_HIGH - RX_BD_SPACE_BASE + 1);
( t, r  u7 t) R2 T! z- G, _0 g4 W# g2 H. r5 Z# T1 L0 V$ L. J$ N) I
        Status = XAxiDma_BdRingCreate(RxRingPtr, RX_BD_SPACE_BASE," A2 E& F) }4 z/ _
                                RX_BD_SPACE_BASE,
" n' q- ]- @. u5 Y+ {  w( P! Y                                XAXIDMA_BD_MINIMUM_ALIGNMENT, BdCount);
7 `4 g" ?* h7 g- Q; e5 g( J8 v2 @* Y7 t+ X$ M/ j
        if (Status != XST_SUCCESS) {$ f0 a9 O! W5 F* U& c8 P
                xil_printf("RX create BD ring failed %d\r\n", Status);: }: P$ x2 d  ~+ v

$ Y# r  X4 l0 q. W' G                return XST_FAILURE;. d' {! q" |) p# A
        }# u3 c; o) w1 F& G  g$ ?# [" K

1 M! V9 E, [5 Z: b! J+ A& K        /*5 J; D4 |( l; y
         * Setup an all-zero BD as the template for the Rx channel.) x- {5 C4 ]3 t7 Y% m# R1 U
         */2 z. K2 W! _" {) X, R3 M5 m
        XAxiDma_BdClear(&BdTemplate);1 ]! e+ ^5 f5 k$ M- J+ ~4 d

* L5 R/ d: b! Z3 C) A        Status = XAxiDma_BdRingClone(RxRingPtr, &BdTemplate);
, b4 D8 |! V7 @( P0 W4 w# c+ u' J/ q        if (Status != XST_SUCCESS) {
; [$ |" G9 B3 w+ N3 X2 ^& S2 Y; \                xil_printf("RX clone BD failed %d\r\n", Status);
/ [) s, C3 f: M. g3 Q7 I/ F9 x
$ Z. n  R9 Y! k1 k& z( F                return XST_FAILURE;5 s/ d; p0 F$ Q* R6 k0 R
        }6 l, k, I; p7 E) ]
  A/ \0 {  N5 x/ ~
        /* Attach buffers to RxBD ring so we are ready to receive packets */1 g. {6 ^. [* I
! I0 _" _$ [6 a5 _) [6 O
        FreeBdCount = XAxiDma_BdRingGetFreeCnt(RxRingPtr);9 {& d6 s3 I& a' d) j
: Q/ V; e6 [2 @5 Y* u+ f
        Status = XAxiDma_BdRingAlloc(RxRingPtr, FreeBdCount, &BdPtr);6 r/ o. V0 v4 R/ _% o
        if (Status != XST_SUCCESS) {
  E' @- ?% g6 B8 v  A/ z# f                xil_printf("RX alloc BD failed %d\r\n", Status);$ w1 a! Z7 \& t
$ M8 [! L- ?  R' t2 M' H% n$ o
                return XST_FAILURE;  Z5 s/ D7 B6 I( O- w9 d1 D: Y1 o
        }& Z" ~% g3 H0 Q; c/ t7 l
$ G' e. O% y% S# k
        BdCurPtr = BdPtr;
# J6 S# P/ F) i; a3 ]3 Y        RxBufferPtr = RX_BUFFER_BASE;
+ |$ {6 a( c6 u; ^        for (Index = 0; Index < FreeBdCount; Index++) {# _7 ~; C! v+ c( v& w3 ]3 d8 F+ B
                Status = XAxiDma_BdSetBufAddr(BdCurPtr, RxBufferPtr);
7 F* c' r- w* b9 {0 ]( E) [) d: b$ d2 G
                if (Status != XST_SUCCESS) {
# @% N! ~" `9 t% ~+ }                        xil_printf("Set buffer addr %x on BD %x failed %d\r\n",
% ^7 n$ h4 `  X9 {# X& U                            (unsigned int)RxBufferPtr,
1 ^- B* z. [: ]+ y' ]                            (UINTPTR)BdCurPtr, Status);( E; r% j. `8 p* l( x6 E: H
" `, S! ?" B- o- ]3 i
                        return XST_FAILURE;3 I, p) i+ }7 V. a& `
                }2 |6 `8 ], c/ [, U, L3 _! C
" b: N" u' [$ T. M
                Status = XAxiDma_BdSetLength(BdCurPtr, MAX_PKT_LEN,
: O( L( t+ \  j4 W9 q+ U5 n- z                                RxRingPtr->MaxTransferLen);6 ~$ X% [5 R: E
                if (Status != XST_SUCCESS) {
7 _* g7 q" U, \7 [  S1 n) v                        xil_printf("Rx set length %d on BD %x failed %d\r\n",
# Q8 i7 o) |/ h" G# Q! c                            MAX_PKT_LEN, (UINTPTR)BdCurPtr, Status);7 v: [9 X4 q4 i  S

% Y; f7 G0 P1 K( J3 m/ w; p                        return XST_FAILURE;
7 k2 e1 ^( H! q/ b  d, m                }
9 C/ J% j' m- @6 q) V9 h7 n) ]
, m! M+ w% I4 {; w) g7 y8 }                /* Receive BDs do not need to set anything for the control: F0 U! T( a1 S* Z, a1 _8 H& P3 K0 p
                 * The hardware will set the SOF/EOF bits per stream status" W! A' g% M5 l  G, ~0 B+ T/ |4 W) t
                 */& f" K$ Q" Z3 R& h& j
                XAxiDma_BdSetCtrl(BdCurPtr, 0);
4 C  w0 s! l, ]& B                XAxiDma_BdSetId(BdCurPtr, RxBufferPtr);
: N9 _% C- m; C  ^* h/ o
7 ~0 W7 Y! D& }! y                RxBufferPtr += MAX_PKT_LEN;
  R; r, J9 W' C7 ?                BdCurPtr = (XAxiDma_Bd *)XAxiDma_BdRingNext(RxRingPtr, BdCurPtr);
! _+ f: Z" q; j1 O        }' u8 A9 y: \6 t! I5 i3 z

' w# R4 g  _* _& w% ?  t        /* Clear the receive buffer, so we can verify data. g4 [; k. Y# e
         */
: X& a0 Q  S( o% C8 g. L        memset((void *)RX_BUFFER_BASE, 0, MAX_PKT_LEN);
! c# c. }1 J4 \2 D  `: d/ P7 }* }. s( c+ L' L9 f
        Status = XAxiDma_BdRingToHw(RxRingPtr, FreeBdCount," T/ E$ f, C' g- R) z7 z& b
                                                BdPtr);/ P: f" z/ f$ w2 J0 ]
        if (Status != XST_SUCCESS) {
- ~. L( s- H  Q+ _                xil_printf("RX submit hw failed %d\r\n", Status);: \$ s3 H2 B6 Y: F1 I$ D
& S% X# F, V7 W/ ?8 F
                return XST_FAILURE;
& w7 L% s( _6 G; D        }: ?- a/ R6 Z/ T
2 b  u$ ~2 ~3 k8 F+ z& Z
        /* Start RX DMA channel */
8 c# Q% e( ~! ?' j: B( I8 b  R        Status = XAxiDma_BdRingStart(RxRingPtr);
  p' w: n7 P- R) |. H* Y6 u        if (Status != XST_SUCCESS) {, n& {) t% U% o" d; C! J1 ]
                xil_printf("RX start hw failed %d\r\n", Status);
; M, U( Z8 Y. j7 d8 Z) a1 g+ I/ |) v& N& A2 o
                return XST_FAILURE;
% f: t/ ~7 z9 _& Z# Q) l. H        }
! Y" L& A+ u( d) d$ s
- ]- j$ x% c: S1 H        return XST_SUCCESS;
' _3 W( [5 J- t0 [2 w}7 `  r  _9 f+ y. U

6 d( _( ?' A6 _. z/*****************************************************************************/) @* \9 S; P1 O2 [# V* W9 M
/**5 Q! m- _9 z: ]  a2 }. U
*8 E" Q% r4 u' P+ a; c1 Q" y
* This function sets up the TX channel of a DMA engine to be ready for packet7 m4 I& Y7 R, S+ u6 P6 Q' W' w
* transmission
0 N4 G5 V. Z6 U; }+ C  j*
  X2 D, L$ j! D* @param        AxiDmaInstPtr is the instance pointer to the DMA engine.
, G7 s& c  Y& y*0 T6 u$ F. k/ v: y
* @return        XST_SUCCESS if the setup is successful, XST_FAILURE otherwise.8 L% j0 F- `: S; E8 _% k3 d* ?
*
/ ^. P/ @; B, t7 u* @note                None.5 i5 q+ k4 x* _; f8 C
*# E% b9 r1 V3 A1 m# d8 H2 W
******************************************************************************/0 v1 r" W7 \! I( t
static int TxSetup(XAxiDma * AxiDmaInstPtr)
+ ?7 k5 J. V7 H1 W+ F* s2 w3 D3 E7 j{1 n5 K. B3 ]# k) i4 l' o
        XAxiDma_BdRing *TxRingPtr;
" S9 q' t& \% j2 D5 d: P2 @. @        XAxiDma_Bd BdTemplate;
5 O; G! Q' M8 U3 H$ w- M        int Delay = 0;
% v: E$ A/ |* v6 K2 o! Z# `* Z& h        int Coalesce = 1;
# c* s3 V1 P' Y0 _1 c, V& L. Z, O        int Status;$ v  h4 y: d. E" Z# Q5 @, J1 l
        u32 BdCount;
' |- z  ]5 I4 ]5 {8 r2 V1 \4 c4 i  V7 e/ T; j
        TxRingPtr = XAxiDma_GetTxRing(&AxiDma);- n  p7 A( T! s: `  l

+ K+ h- H+ E9 H& s) G; m$ p$ `/ X' S        /* Disable all TX interrupts before TxBD space setup */) O/ w2 I2 W% ^# F

9 ~! T% a7 f) u, l        XAxiDma_BdRingIntDisable(TxRingPtr, XAXIDMA_IRQ_ALL_MASK);3 {) ~3 _: h6 H2 P+ J8 B3 j# e

& q2 h4 u' k, i2 `        /* Set TX delay and coalesce */1 F& a, ^! I- N* t. ^/ r6 f( |; Z7 e
        XAxiDma_BdRingSetCoalesce(TxRingPtr, Coalesce, Delay);+ T' h, j' ]; y. M% a+ d& |: s
  r( ~# c# E5 V& Z& ^
        /* Setup TxBD space  */
! A" {. i9 m3 A) E2 q) L        BdCount = XAxiDma_BdRingCntCalc(XAXIDMA_BD_MINIMUM_ALIGNMENT,
$ G5 G: i1 W7 d3 B* i$ |                                TX_BD_SPACE_HIGH - TX_BD_SPACE_BASE + 1);
9 W% m) c6 z7 ?( t% q# ~- |. h7 j  x- X: _2 b
        Status = XAxiDma_BdRingCreate(TxRingPtr, TX_BD_SPACE_BASE,/ M# K  J7 d8 T/ c$ f- H& ^7 |
                                TX_BD_SPACE_BASE,
/ c4 Z  H: J- f1 @( I' H                                XAXIDMA_BD_MINIMUM_ALIGNMENT, BdCount);: K: L* N& T, [. ]$ m4 P
        if (Status != XST_SUCCESS) {3 _0 k5 T9 l  P
                xil_printf("failed create BD ring in txsetup\r\n");! G& C+ V  G2 c) h! M
! h6 J! s4 U/ z8 L0 s
                return XST_FAILURE;
2 O, l+ r" |5 b/ b& y5 w9 m        }6 u  q# l* k9 I% Q  T$ u

/ |( V, V, ~- k; x+ k# q' g% U1 i! S- z        /*4 @0 x% g0 c  {& D
         * We create an all-zero BD as the template.
( A7 \& T- g2 o* ^         */
+ h& v( t! C1 t        XAxiDma_BdClear(&BdTemplate);2 B6 x3 F( N8 G4 d: h
* d  t3 v% |% H6 k# o% K
        Status = XAxiDma_BdRingClone(TxRingPtr, &BdTemplate);4 {3 b8 Y$ d% p" o5 a5 D
        if (Status != XST_SUCCESS) {/ r$ a+ P! k5 K' B' Z
                xil_printf("failed bdring clone in txsetup %d\r\n", Status);  F+ A5 w2 w" d6 b5 c) o. t

1 Z( p, c; N3 F8 ?# Q! D7 X+ }& l                return XST_FAILURE;
) M! ?0 A7 G0 n" z/ |        }
5 L, t3 i7 X/ z' x3 t  n) h* O% x( a5 F& ]
        /* Start the TX channel */
2 ]2 G/ H$ a' ~4 J, k2 M8 o# ?        Status = XAxiDma_BdRingStart(TxRingPtr);! U3 G' A! A2 c2 [8 P% `
        if (Status != XST_SUCCESS) {
7 k9 R6 G) y9 o* o0 x- v5 }                xil_printf("failed start bdring txsetup %d\r\n", Status);
) z( ?7 \. c5 V6 S6 |8 g6 R% c, n
% @; H" C0 R# {  \4 s                return XST_FAILURE;% W9 _) ?3 A8 h% j. W& e* \( F& n
        }
6 d1 z: K5 G' P5 r* r
$ y7 C) \8 _* R        return XST_SUCCESS;
: A1 J% \9 m2 ~* b! u4 H4 n}5 Z& J3 z  E/ W* o+ h& F! E4 c

$ \* a/ @. M' f# f& D& w/*****************************************************************************/; y. m9 X; X! j! P  r; u
/**
4 @& I) n; U4 t*
8 W) y6 E1 M1 Z, h" e* This function transmits one packet non-blockingly through the DMA engine.3 X* k8 ~" P( {. H  X- `+ p. A
*
- q2 i) G4 J- k* @param        AxiDmaInstPtr points to the DMA engine instance
, j3 g% H7 ~: o* u! ?*% Q' \) \: r8 L9 C8 W& N
* @return        - XST_SUCCESS if the DMA accepts the packet successfully,
; @+ K0 r# Y+ k( B  p4 N*                - XST_FAILURE otherwise.2 }6 d. q2 S# K2 M8 O
*
) ?) i/ M" S2 F. ]% k* @note     None.
" Y0 L5 H3 \" g8 O: r+ d*
* V( j' q. l& D9 F! I******************************************************************************/8 z* q' ^1 Z' Y. [
static int SendPacket(XAxiDma * AxiDmaInstPtr): {5 \) S, n8 W$ \' n
{
* r3 R( R, u% i" W% {        XAxiDma_BdRing *TxRingPtr;' b0 Z+ M( `$ C& e% S& C
        u8 *TxPacket;
1 ~1 p2 c: c7 K- W        u8 Value;
, ?# \# n( Q& o/ q: {7 y/ p        XAxiDma_Bd *BdPtr;
) D/ u$ x% \% W( t        int Status;
& c' m; H( z% g2 k9 ?) }        int Index;
2 h) Y: \) m# F0 x- f% e0 T
& I" B$ \# V* ?7 i1 h8 W        TxRingPtr = XAxiDma_GetTxRing(AxiDmaInstPtr);
6 o& f3 a+ f4 X& s; o/ U. Y7 k- V# E9 X; E, S
        /* Create pattern in the packet to transmit */
$ Q3 W' j3 R: x9 b        TxPacket = (u8 *) Packet;3 z" `. p  _$ s) `+ X" F# I
- S/ L' X* |3 q2 b
        Value = TEST_START_VALUE;0 m9 o& t/ \! k) e( R

" e8 {$ V( P) P! @- r        for(Index = 0; Index < MAX_PKT_LEN; Index ++) {/ V1 Z# s/ _$ A
                TxPacket[Index] = Value;
& m3 u+ z1 q1 B2 s+ \& i" R2 G: B' ^* g
                Value = (Value + 1) & 0xFF;. ]& j* A/ y& v& g3 K0 N  e+ \; `9 Q
        }5 y! m) T& R9 X& \/ H3 J# i

3 H. S' o" T* O+ F1 s        /* Flush the SrcBuffer before the DMA transfer, in case the Data Cache
( l3 o! F  S" y1 P6 z         * is enabled3 d8 a/ y% ]# @; H+ ]4 f6 [' J
         */
2 j& i" a* Z$ ^, u; r7 f) {# J        Xil_DCacheFlushRange((UINTPTR)TxPacket, MAX_PKT_LEN);0 Z- d. [& x. [& U/ u6 U
#ifdef __aarch64__
% i0 A7 l* M" Y& L% w/ k        Xil_DCacheFlushRange((UINTPTR)RX_BUFFER_BASE, MAX_PKT_LEN);0 \2 f9 P5 n( J! W7 i& M
#endif
$ W* x. @2 n# k; U6 U" g2 s- l; c& y0 H

5 i0 ]7 n. \; c4 h+ |        /* Allocate a BD */& s' i8 i- E6 x4 B2 {
        Status = XAxiDma_BdRingAlloc(TxRingPtr, 1, &BdPtr);5 j8 c! l! S' R. C. t
        if (Status != XST_SUCCESS) {
0 G6 t4 ^7 c* h) [0 o8 y/ d                return XST_FAILURE;
5 p  ~% ^0 z. y# ]! O        }) \0 ]$ v* D2 h. i& u

1 s8 d+ e$ y, X- z( A        /* Set up the BD using the information of the packet to transmit */9 B, r6 S, P! D8 s% f: o
        Status = XAxiDma_BdSetBufAddr(BdPtr, (UINTPTR) Packet);+ P. F% F! D* U& j- g* z
        if (Status != XST_SUCCESS) {
: I$ Y* W& P! _                xil_printf("Tx set buffer addr %x on BD %x failed %d\r\n",
4 Q6 l  f, {! u! E                    (UINTPTR)Packet, (UINTPTR)BdPtr, Status);
- r( V3 Y5 L$ E6 h! g! P
, |+ F1 h1 Y- ^5 ~9 K# S8 V                return XST_FAILURE;
- g0 O6 l# B8 Q! Q6 W        }; r, x  W* O: a, B' I
  j+ r: ~; }! [$ \- N, _
        Status = XAxiDma_BdSetLength(BdPtr, MAX_PKT_LEN,
5 F& t+ x/ h: J1 w; f                                TxRingPtr->MaxTransferLen);( w% ~# k- Y$ H
        if (Status != XST_SUCCESS) {# ?$ o9 q  j1 x7 q7 y
                xil_printf("Tx set length %d on BD %x failed %d\r\n",
  a3 n/ H8 i8 ^1 V5 L) Y: `                    MAX_PKT_LEN, (UINTPTR)BdPtr, Status);
, E) |' w, ?6 W3 m) T  n  g8 j+ }. {: R6 N4 h& w" Y
                return XST_FAILURE;
3 m! d% z4 Z/ L- N% \: R. ?# W9 c        }8 m4 p  ~; E2 Z5 e) {& x/ S; u

$ V; `0 {  n. J6 ]* N! D#if (XPAR_AXIDMA_0_SG_INCLUDE_STSCNTRL_STRM == 1)
8 I" f1 P) a% B/ ~$ D+ t! o3 m& U        Status = XAxiDma_BdSetAppWord(BdPtr,
2 O, S3 w2 a) ~2 V: z6 L0 o. f            XAXIDMA_LAST_APPWORD, MAX_PKT_LEN);
- C% O3 ]' _, q
3 R3 p$ D1 Q& t+ }  b$ J        /* If Set app length failed, it is not fatal4 R2 @( X( X( f6 x  i- k8 e' x# e
         */1 m' m( @( w1 n) h+ b0 l
        if (Status != XST_SUCCESS) {" ~8 H. H: q# i) t
                xil_printf("Set app word failed with %d\r\n", Status);8 B- K, |4 X2 o
        }
  @  I) Y0 ?* \" w0 c- e#endif! l1 {1 ?* h# L
; _) a. W4 g% `& g
        /* For single packet, both SOF and EOF are to be set
3 J( a- f3 h3 f! ?         */
) h% I" S" D; ?0 w* Z$ G        XAxiDma_BdSetCtrl(BdPtr, XAXIDMA_BD_CTRL_TXEOF_MASK |; V9 z& N; f4 K5 A
                                                XAXIDMA_BD_CTRL_TXSOF_MASK);+ T  Y/ @5 _3 l. w% g9 z

; G- u$ {) W) M" A4 Q        XAxiDma_BdSetId(BdPtr, (UINTPTR)Packet);
# H" ?0 ?+ D! S& w7 a) f# b! Q
! J( o  C& g  X5 N. ~% `' j% P        /* Give the BD to DMA to kick off the transmission. */. C$ B8 `5 b, X: ]/ N4 M
        Status = XAxiDma_BdRingToHw(TxRingPtr, 1, BdPtr);
% l( b* G1 X: ]: ^4 o* m$ J        if (Status != XST_SUCCESS) {
" b) I4 ?$ @+ v$ a( h                xil_printf("to hw failed %d\r\n", Status);
. h% B0 _, p, i1 |9 J; V# j: ]                return XST_FAILURE;/ R5 T" ?3 D7 k0 W/ e! M% T! o
        }
) R7 h' e  \9 p& U
( N# r* g8 E( t) M0 V& y/ F4 g( p* [" L* K# f

. ]* Z5 n8 Q* w8 V' r  V' o1 @% C        return XST_SUCCESS;
; Q- o! X' E0 {' V7 G: c9 }}3 ]9 {  y; g0 S( h4 B
1 y" a& P. Z. G% p2 W
/*****************************************************************************/
$ m2 D% o; P1 j4 }; e9 {; {6 @0 l/*, t2 \9 r7 v* w! F' G$ x3 x
*
* I+ {  a, g9 [( u* This function checks data buffer after the DMA transfer is finished.1 G( V8 p) m5 F8 |# O
*" C0 K2 R' ]4 ~" f- ?$ [. e/ H
* @param        None# |. j5 u/ o3 H5 ?7 f! m/ i' H
*
0 ^2 c1 k( b+ O' H$ [+ J& e$ i* @return        - XST_SUCCESS if validation is successful
5 @5 C* m5 x8 ?# J/ g: k*                - XST_FAILURE if validation is failure.
9 G# m. u  G; f*2 Q' g8 ?( A- Z8 d- f* `; z
* @note                None./ t; t/ o. D! ~# c9 P" L
*% g. Z6 F  P1 s1 D6 m% }; @
******************************************************************************/
/ p' i8 S; ~  I0 X6 {3 n2 C3 D2 Kstatic int CheckData(void)8 o  g( P$ L/ [
{
: w: v  b7 X. x& i6 Q7 w+ @( U        u8 *RxPacket;
4 X/ s0 H# i' A/ |7 N        int Index = 0;
  q3 b0 t4 D( Y        u8 Value;
( ~. ]# s0 G  h+ u- I
. P0 O  [7 Q: W) {  z1 e6 c- e
0 K- o- u- ?/ ~9 `        RxPacket = (u8 *) RX_BUFFER_BASE;
/ b: x* H7 N1 u/ A- N" s        Value = TEST_START_VALUE;  @6 ]$ y3 S' z" y

* y6 R" K- g$ h- o+ \6 @        /* Invalidate the DestBuffer before receiving the data, in case the
$ F7 p! C( B" O" a, I7 ]         * Data Cache is enabled% M. l! D2 J" E
         */! I7 B  J# }' p& u6 B. x
#ifndef __aarch64__7 E9 c5 b, Y/ p9 i, j
        Xil_DCacheInvalidateRange((UINTPTR)RxPacket, MAX_PKT_LEN);
6 c8 z5 [. o) |6 a3 T#endif
6 B# U' j; d( W- G: v" X3 ?+ ]1 M* I0 L* q
        for(Index = 0; Index < MAX_PKT_LEN; Index++) {+ o  e+ V3 B: N2 Q  p% ]
                if (RxPacket[Index] != Value) {; d) h7 ~: j. }- ?6 Y6 f
                        xil_printf("Data error %d: %x/%x\r\n",7 q+ W3 c8 ?9 |) y2 Y! m: ^% C
                            Index, (unsigned int)RxPacket[Index],1 m: o6 I! Z- s" T" p8 _' `
                            (unsigned int)Value);7 ~* ^' ]9 N- k4 D! D, T- h( ]

8 }- t4 f% ~/ e                        return XST_FAILURE;
  j! p- z3 F; _( G0 M& p                }
+ l, ~% P  V; u                Value = (Value + 1) & 0xFF;+ ]+ L- P' `% h! O
        }; L2 |/ ?% e2 G; {- N- L

( D. F- U8 x% _# Y$ y: r. T        return XST_SUCCESS;7 e$ q! I, m) \) N# l& \  P
}8 P, @% ~, Q" x5 P( o+ @2 ?9 T
6 d7 }) K& E; ~; K% R
/*****************************************************************************/; u) I+ Z2 Z; N/ c+ H$ C: s$ ?
/**, c) ]% h4 l6 B% x7 t# {2 A3 t
*
0 N1 O  F7 K( x' ]) a( ^1 s9 f' ], Z* This function waits until the DMA transaction is finished, checks data,
- k& [5 m# j# U& f* and cleans up.+ Q4 V& x: Q2 j, O/ J" E* N
*
5 a1 q1 W) S% e3 V, r# j* @param        None& z3 o5 a+ k7 T- A
*9 L, d3 {/ n; o7 l
* @return        - XST_SUCCESS if DMA transfer is successful and data is correct,
  u6 I! M+ w/ W9 h*                - XST_FAILURE if fails.# `0 ?7 {" ]6 k1 T3 v
*6 b4 i& }' K) m& s: N$ e- w
* @note                None.
  c4 R6 ~( R. b9 `/ r" x/ h*- _4 }( B/ x1 H% h& T8 V- z
******************************************************************************/* ]* {) Y( T" X
static int CheckDmaResult(XAxiDma * AxiDmaInstPtr)
8 v& a" D4 H8 ]. @{! [% E- A5 z( y# n7 L- B
        XAxiDma_BdRing *TxRingPtr;
% ?' X! b$ v& T2 |        XAxiDma_BdRing *RxRingPtr;& z( _0 H% K' m
        XAxiDma_Bd *BdPtr;" R+ \8 x  d8 H7 p$ D& L
        int ProcessedBdCount;& N4 U* [. ^* u( _! B8 B' l
        int FreeBdCount;
# K+ g( B  _& |$ I  d        int Status;5 T) B4 E. S, {/ u$ T

( R! T5 l; ]9 A  }( K: t& s        TxRingPtr = XAxiDma_GetTxRing(AxiDmaInstPtr);
) H: t. y' z# k5 g+ s, g0 r        RxRingPtr = XAxiDma_GetRxRing(AxiDmaInstPtr);# R8 E: M; w) ]8 N' l- w

) V- i$ W3 R% N' a; l0 P        /* Wait until the one BD TX transaction is done */
- \1 O5 w1 r( f, u        while ((ProcessedBdCount = XAxiDma_BdRingFromHw(TxRingPtr,  t  v: p3 i0 s. l
                                                       XAXIDMA_ALL_BDS,& ?& X8 w- }( l  K6 N5 ]" V. t
                                                       &BdPtr)) == 0) {+ [! H* J. _4 M6 j  e" ~9 p& c; ^" m
        }
+ k: c: }! i" B& F$ ?1 S8 w* ~
$ T% r# r3 Y0 x3 K+ h& w        /* Free all processed TX BDs for future transmission */1 |9 ?3 a4 l  r5 ]" N/ v. U
        Status = XAxiDma_BdRingFree(TxRingPtr, ProcessedBdCount, BdPtr);
+ F1 V' N& h: R' G: B! A7 K/ y2 {! E        if (Status != XST_SUCCESS) {" e/ j) ~- ?1 q9 i2 [3 H- ^
                xil_printf("Failed to free %d tx BDs %d\r\n",
- l7 P: Q3 r2 ^4 b, y* |                    ProcessedBdCount, Status);5 V1 D0 y: g; Q) ]/ ]& E/ U
                return XST_FAILURE;
" Z4 \8 W; u8 b8 \        }
3 H7 b2 O/ R7 u% Y1 }9 o( k' b0 ]8 @" x% C6 Q3 @
        /* Wait until the data has been received by the Rx channel */! Q( A8 S( N0 i8 S  F% @
        while ((ProcessedBdCount = XAxiDma_BdRingFromHw(RxRingPtr,# l6 Z2 b2 r' |3 v( [8 I% {* N
                                                       XAXIDMA_ALL_BDS,
) Q& E" K  u$ I, Q5 t( o                                                       &BdPtr)) == 0) {5 c3 r" {/ S( e4 T+ @
        }
$ J; Y  q5 I+ \0 Q4 f6 g! g* J$ T6 t- [7 P0 X' R0 _
        /* Check received data */# }' u* N) ?" B6 T2 `
        if (CheckData() != XST_SUCCESS) {' w: W' o# h  z5 {$ ]: }7 S

, A+ A* N. L: j: I% E, h* Y' E2 n                return XST_FAILURE;
0 s5 V& U1 |& x9 p        }
8 W2 A. q: P8 R* o9 z! a/ f3 N
5 N* H2 v) {/ E2 _" e5 f* ]        /* Free all processed RX BDs for future transmission */9 @* `8 T$ n  C8 d  P
        Status = XAxiDma_BdRingFree(RxRingPtr, ProcessedBdCount, BdPtr);. `7 e9 P; _) ?* `3 F
        if (Status != XST_SUCCESS) {
, N( N5 n* m4 V& K- V                xil_printf("Failed to free %d rx BDs %d\r\n",2 Y. u+ R8 z" s; r/ P4 K( w
                    ProcessedBdCount, Status);
- K6 m2 _, E# @) N                return XST_FAILURE;% T# s2 T+ c# V. t
        }9 W; l, R' d% \+ k8 E" w& L+ A
% M4 m+ S( _( w) Y% i" t( O
        /* Return processed BDs to RX channel so we are ready to receive new
9 B8 g, e2 r) t4 E         * packets:
; z% e8 Q7 C- [* A* v2 ]         *    - Allocate all free RX BDs
" ~6 P3 r- |8 ~& Q, ^4 u' A) W         *    - Pass the BDs to RX channel
0 ~8 G) _: S6 p" g& `: W/ A         */
$ B) b5 |- |- R0 m( }3 v9 U/ e        FreeBdCount = XAxiDma_BdRingGetFreeCnt(RxRingPtr);$ @1 [# E2 F6 M! W& \8 C& M' m/ d
        Status = XAxiDma_BdRingAlloc(RxRingPtr, FreeBdCount, &BdPtr);' D; |; q. }+ {- _8 ~
        if (Status != XST_SUCCESS) {
8 p  f& r1 ]# h2 Z3 ^9 _! [                xil_printf("bd alloc failed\r\n");( T% v, K$ Q6 Y
                return XST_FAILURE;
1 H' @2 V* B0 h  b5 I        }
* r5 V% `' f1 }6 _& n3 u5 I% u1 X# K% C) W1 C( T, V3 b
        Status = XAxiDma_BdRingToHw(RxRingPtr, FreeBdCount, BdPtr);
) n0 u1 {, g5 W8 g* L' ]7 X7 Y. ]% {        if (Status != XST_SUCCESS) {
9 d7 x2 P% }# C# g  p- d                xil_printf("Submit %d rx BDs failed %d\r\n", FreeBdCount, Status);
/ v  N8 \, j0 I4 _" [# A/ b                return XST_FAILURE;5 V& h$ B% X* F7 U
        }$ m9 j; q1 u4 Q) F9 q/ R" \9 r/ I

6 b* [: W4 z3 \$ z6 R        return XST_SUCCESS;
. ~# e# V# b' u; I# X: s}1 Y# L2 ^2 l+ w
& ]: e, X* g. Z& l

  Q/ j$ L) G- c! M
 楼主| 发表于 2019-4-15 14:22 | 显示全部楼层
打印信息
9 w0 V1 g0 U: \/ L9 H9 M# e3 u' }" X. N( A" q! u) u
--- Entering main() --- 4 H: k# k# [- v5 L, m
Successfully ran AXI DMA SG Polling Example
2 S6 a6 x2 r, j) q* w$ }9 T3 }) D: O--- Exiting main() ---
发表于 2019-4-15 14:29 | 显示全部楼层
弯弯勾勾认不到。呵呵呵

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