//初始化外部SRAM
void FSMC_SRAM_Init(void)- H$ e! G$ G8 f2 I6 N
{
FSMC_NORSRAMInitTypeDef FSMC_NORSRAMInitStructure; //定义FSMC初始化的结构体变量0 k, s+ I! p& I
FSMC_NORSRAMTimingInitTypeDef readWriteTIming; //用来设置FSMC读时序和写时序的指针变量
GPIO_InitTypeDef GPIO_InitStructure; //初始化FSMC总线的IO口
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD|RCC_APB2Periph_GPIOE|RCC_APB2Periph_AFIO,ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC,ENABLE); //开启FSMC的时钟
GPIO_InitStructure.GPIO_Pin =GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10|GPIO_Pin_14
|GPIO_Pin_15|GPIO_Pin_0|GPIO_Pin_1! x+ o, y' T" W( [
|GPIO_Pin_7|GPIO_Pin_11|GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_4|GPIO_Pin_5;6 y( @6 W( J+ D$ {5 A+ K3 U' f# x) D# N
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //IO口配置为复用推挽输出& H( @7 Z* T5 u" P- v" z+ [
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;* O' W; C8 s$ e% {6 `( w) L1 ]
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9
|GPIO_Pin_10|GPIO_Pin_11|GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;0 d3 r1 K) I! k" C2 E& a8 k7 k
GPIO_Init(GPIOE, &GPIO_InitStructure);
, L6 |) a5 x; h
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;+ K+ r( l7 G1 K" f. n3 D( {
GPIO_Init(GPIOE, &GPIO_InitStructure);! t- _0 u' }( z, d8 z0 B% ]
' Z7 M, {6 O0 V+ k" Y
readWriteTIming.FSMC_AddressSetupTIme = 14;
readWriteTIming.FSMC_AddressHoldTime = 0x00;
readWriteTiming.FSMC_DataSetupTime = 16; ; y' r4 v) W4 R' Y3 j
readWriteTiming.FSMC_BusTurnAroundDuration = 0;/ U4 s- v% H: r( d* l. T% q
readWriteTiming.FSMC_CLKDivision = 0x00;
readWriteTiming.FSMC_DataLatency = 0x00;
readWriteTiming.FSMC_AccessMode = FSMC_AccessMode_A; # f; |0 j% H4 t; V' r
/ C1 k5 S( x; L' j2 Q
FSMC_NORSRAMInitStructure.FSMC_Bank=FSMC_Bank1_NORSRAM1;
FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable;
FSMC_NORSRAMInitStructure.FSMC_MemoryType =FSMC_MemoryType_SRAM;- L) ~+ D- L+ b6 p
FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth= FSMC_MemoryDataWidth_16b;
FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode=FSMC_BurstAccessMode_Disable;- { W* N, c* W1 ]
FSMC_NORSRAMInitStructure.FSMC_WaitSignalPolarity = FSMC_WaitSignalPolarity_Low;
FSMC_NORSRAMInitStructure.FSMC_AsynchronousWait=FSMC_AsynchronousWait_Disable;
FSMC_NORSRAMInitStructure.FSMC_WrapMode = FSMC_WrapMode_Disable; 7 `1 U" w/ q' [# [
FSMC_NORSRAMInitStructure.FSMC_WaitSignalActive = FSMC_WaitSignalActive_BeforeWaitState; : z, c+ G! ~, e: v3 T' P. R3 o
FSMC_NORSRAMInitStructure.FSMC_WriteOperation = FSMC_WriteOperation_Enable;
FSMC_NORSRAMInitStructure.FSMC_WaitSignal = FSMC_WaitSignal_Disable; ' A, u9 i3 C$ c0 }) I0 h" ~
FSMC_NORSRAMInitStructure.FSMC_ExtendedMode = FSMC_ExtendedMode_Disable;- b0 _/ s! m0 o8 Y3 O d
FSMC_NORSRAMInitStructure.FSMC_WriteBurst = FSMC_WriteBurst_Disable;
FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct = &readWriteTiming;
FSMC_NORSRAMInitStructure.FSMC_WriteTimingStruct = &readWriteTiming;' I2 v$ v8 L; e4 g8 A
FSMC_NORSRAMInit(&FSMC_NORSRAMInitStructure);
FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM1, ENABLE); $ S* q1 L7 K. X" _: E+ F) F6 H
delay_ms(50)； % D/ s/ h+ n. f- ~8 J
}
FPGA代码：
//fsmc read / write ep4ce6 demo
module fsmc(, G- F y( ^/ T1 ?
ab, //address
db, //data* O) r; K3 G, `
wrn, //wr
rdn, //rd
resetn, //resetn, ~+ f/ ?* J) I+ M+ w& D
csn, //cs% _8 @4 @$ z! |
clk
);8 U9 ]2 f5 E: k; e( B1 x3 G
1 N# C0 r( \, K& W7 G* x6 B
input[2:0] ab;
inout[15:0] db;
input wrn;
input rdn;
input resetn;) e& ?& z; H- R. |# C$ }1 ]
input csn;' F1 {1 O8 ~7 S: B
input clk;' V3 H+ k7 {) ^) K/ \
" o; u4 \ H; e: |9 A2 E6 F' L. ~
reg [15:0] ina = 16'd0; //存储数据供ARM读
reg [15:0] inb = 16'd1;
reg [15:0] inc = 16'd2;
reg [15:0] ind = 16'd3;
reg [15:0] ine = 16'd4;
reg [15:0] inf = 16'd5;! s( z3 Y9 E( s0 ]+ X+ j
reg [15:0] ing = 16'd6;) ~, C: _* F* y! N: M
reg [15:0] inh = 16'd7;3 w* N0 j5 T2 _& p
0 e) L4 J2 `2 B. g! u9 e5 f' W5 L
reg [15:0] outa;
reg [15:0] outb;
reg [15:0] outc;
reg [15:0] outd;' C: h1 g$ b8 H. p# q3 O8 _7 N- P
reg [15:0] oute;! P6 v* q: c) H' t6 j8 e$ V, H
reg [15:0] outf;( m* g0 A7 O8 R7 \$ m
reg [15:0] outg;9 f) i$ X; O8 S3 j
reg [15:0] outh;) K! Z1 q) Z0 L
wire rd;
wire wr;% m( ^* k. M7 L
reg [15:0] indata;
' k1 _. l0 ]+ Q4 y6 b7 N
assign rd = !(csn & rdn); //get rd pulse ____|~~~~|______# C! C/ j& M8 I- `: O- j
assign wr = !(csn & wrn) ; //get wr pulse ____|~~~~|______ b1 B$ w7 g; R1 J; U
/*********当不进行读写操作时db=indata*********) Q# S% R! ?# I6 Q8 I* G: }
*********当进行写操作时db=16'hzzzz**********) w) ^2 N/ L: m# n
*********当进行读操作时db=indata**********/6 G, c& I( ?/ ]7 v* d
assign db = rd? indata:16'hzzzz;
; B$ b) S. \/ y4 a0 Q$ W; z
) |; P4 L8 B- J& O) w3 B! K+ x
//write data, 根据地址线选择八个空间写入，每个空间16位 Y: G: Y& m/ [3 }* g* [( _
always @(negedge wr or negedge resetn)
begin
if(!resetn)begin
outa <= 16'h0000;
outb <= 16'h0000;
outc <= 16'h0000;
outd <= 16'h0000;; b& I0 G' i! {) {2 r9 j
oute <= 16'h0000;
outf <= 16'h0000;/ v2 f; d q" S" L8 U
outg <= 16'h0000;
outh <= 16'h0000;. J# a4 N7 ~# m0 h: ?2 T
end else begin) O( a* ?1 g) ]! e Y& A
case (ab) 5 b- q* m, L0 N
3'b000undefineduta <= db;) v! x5 r- [0 ]: {6 s" T
3'b001undefinedutb <= db;* e: d% R! r6 ]# t6 T
3'b010undefinedutc <= db;& E7 M; ^2 M6 r: F2 u2 H* J
3'b011:outd <= db;2 s7 D: {% c' b: I) g, R5 a% c9 k
3'b100:oute <= db;
3'b101:outf <= db;7 ?2 `6 I. K- p/ y1 s8 Z- m
3'b110:outg <= db;
3'b111:outh <= db;
default:;- w" y! R! }( X3 F! N q9 c& s2 K
endcase+ a4 s7 K* b) E- Y2 G! \3 R2 S% Z
end
end) ^ O9 x h f2 J7 i x6 @$ y
# g" _) J; n2 y- K9 D& {3 B
9 }/ V" E P5 W' _( g B8 |3 v9 T- K
//red data 根据地址线选择8个空间读取，每个空间 16位% i9 `+ h7 ?) d G1 h+ T& H7 W/ N0 @
always @(rd or !resetn)' S+ R4 o4 @" p* w& N) {
begin
if(!resetn)indata <= 16'h0000;+ Q2 Y3 o9 B( m* f
else begin9 Z: O* F- o+ r$ g) c3 m+ E. `
case (ab)
3'b000:indata <= ina;
3'b001:indata <= inb;5 b/ U8 a7 R/ C, F- x6 ~1 A9 D" _9 |
3'b010:indata <= inc;
3'b011:indata <= ind;2 U0 W, f* N- N: g$ _- U
3'b100:indata <= ine;1 @' `% ^! _/ |$ M8 |$ W0 f
3'b101:indata <= inf;
3'b110:indata <= ing;
3'b111:indata <= inh;# q# a Y6 g. ^" s8 S' F
default:;, m% t7 z# b* i' L" b! ]
endcase! h7 l7 K9 `7 {# b5 ~
end
end
endmodule
发表于 2018-11-30 10:02:41
