【iCore4 双核心板_FPGA】例程十:FSMC总线通信实验——复用地址模式
实验原理:
STM32F767上自带FMC控制器,本实验将通过FMC总线的地址复用模式实现STM32与FPGA
之间通信,FPGA内部建立RAM块,FPGA桥接STM32和RAM块,本实验通过FSMC总线从STM32向
RAM块中写入数据,然后读取RAM出来的数据进行验证。
核心代码:
int main(void) { int i; unsigned int fpga_read_data; system_clock.initialize(); fsmc.initialize(); led.initialize(); LED_GREEN_ON; while(1){ for(i = 0;i < 256; i++){ fpga_write(i,i); } for(i = 0;i < 100000; i++); for(i = 0;i < 256;i++){ fpga_read_data = fpga_read(i); if(fpga_read_data != i){ LED_GREEN_OFF; LED_RED_ON; } } } }
module fsmc_ctrl( input clk_25m, input pll_100m, input rst_n, input FSMC_CLK, input NADV, input WRn, input RDn, input CSn, input [23:16]AB, inout [15:0]DB ); //--------------------wire---------------------------------// wire rd = (CSn | RDn); wire wr = (CSn | WRn); //--------------------ab-----------------------------------// reg [23:0]address; always @ (posedge NADV or negedge rst_n) begin if(!rst_n) begin address <= 24'd0; end else begin address <= {AB,DB}; end end //--------------------clk----------------------------------// reg wr_clk1,wr_clk2; always @(posedge pll_100m or negedge rst_n) begin if(!rst_n) begin wr_clk1 <= 1'd1; wr_clk2 <= 1'd1; end else {wr_clk2,wr_clk1} <= {wr_clk1,wr}; //提取写时钟 end wire clk = (!wr_clk2 | !rd); //--------------------db_out-------------------------------// wire [15:0]db_out; assign DB = !rd ? db_out : 16'hzzzz; //--------------------my_ram-------------------------------// my_ram u1( .address(address), .clock(clk), .data(DB), .wren(!wr), .rden(!rd), .q(db_out) );//例化ram模块 //--------------------endmodule----------------------------// endmodule
源代码下载链接:
链接:http://pan.baidu.com/s/1hrK8c3i 密码:syfc
iCore4链接: