【iCore4 双核心板_FPGA】例程十五：基于单口RAM的ARM+FPGA数据存取实验

实验现象：

写RAM命令格式：write:地址（0-255），数据（0-65535）\cr\lf

读RAM命令格式：read:地址（0-255）\cr\lf

核心代码：

int main(void)
{

  /* USER CODE BEGIN 1 */
    int i;
    int address,data;
    char error_flag = 0;
    char receive_data[50];
    char buffer[8];
    char *p;
  /* USER CODE END 1 */

  /* MCU Configuration----------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_USART6_UART_Init();
  MX_FMC_Init();

  /* USER CODE BEGIN 2 */
    usart6.initialize(115200);
    usart6.printf("Hello, I am iCore4!\r\n");
    
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
  /* USER CODE END WHILE */

  /* USER CODE BEGIN 3 */
        if(usart6.receive_ok_flag == 1){
            usart6.receive_ok_flag = 0;
            memset(receive_data,0,sizeof(receive_data));
            memset(buffer,0,sizeof(buffer));
            for(i = 0;i < 30;i ++){
                receive_data[i] = usart6.receive_buffer[i];
            }
            p = receive_data;
            i = 0;
            while(*p != ':'){                                    //»ñÈ¡²Ù×÷ÃüÁwrite or read£©
                buffer[i++] = *p++;
                if(i > sizeof(buffer))i = 0;
            }
            for(i = 0;i < sizeof(buffer);i++){//½«ÃüÁîת»¯ÎªÐ¡Ð´×Ö·û
                buffer[i] = tolower(buffer[i]);
            }
            if(memcmp(buffer,"write",strlen("write")) == 0){//Ö´ÐÐд²Ù×÷
                error_flag = 0;
                p++;
                address = atoi(p);
                if(address > 255)error_flag = 1;
                p++;
                p = strchr(p,',');
                if(p == NULL)error_flag = 1;
                if(!error_flag){
                    p++;
                    data = atoi(p);
                    if(data > 65535)error_flag = 1;
                    
                    if(!error_flag){
                        fpga_write(address,data);
                        usart6.printf("Write FPGA Ram Successfully!");
                    }                
                }
            }else{
                if(memcmp(buffer,"read",strlen("read")) == 0){//Ö´ÐжÁ²Ù×÷
                    error_flag = 0;
                    p++;
                    address = atoi(p);
                    if(address > 255)error_flag = 1;
                    p++;
                    if(strchr(p,','))error_flag = 1;
                    if(!error_flag){
                        data = fpga_read(address);
                        usart6.printf("Read FPGA Ram:%d\r\n",data);
                    }                    
                }else{
                    error_flag = 1;
                }
            }
            if(error_flag){
                LED_RED_ON;
                LED_GREEN_OFF;
                usart6.printf("Bad Command!\r\n");
            }else{
                LED_RED_OFF;
                LED_GREEN_ON;
            }
        }
  }
  /* USER CODE END 3 */

}

module ram_ctrl(
    input clk_100m,
    input rst_n,
    input wr_n,
    input rd_n,
    input cs0,
    input [23:16]ab,
    inout [15:0]db,
    output led_red,
    output led_green,
    output led_blue
);
//----------------------------clk------------------------------//
wire wr,rd;
wire [15:0]data_out;

assign wr = wr_n | cs0;
assign rd = rd_n | cs0;

reg wr_0,wr_1;
always@(posedge clk_100m or negedge rst_n)
    if(!rst_n)
        begin
            wr_0 <= 1'd1;
            wr_1 <= 1'd1;
        end 
    else 
        {wr_1,wr_0} <= {wr_0,wr};
        
wire clk = !wr_1 | !rd;
assign db = !rd ? data_out:16'hzzzz;

//----------------------------ram------------------------------//
ram u1(
    .clock(clk),
    .wren(!wr),
    .rden(!rd),
    .address(ab),
    .data(db),
    .q(data_out)
);

//----------------------------led_ctrl-------------------------//
reg led;
always@(posedge clk or negedge rst_n)
    if(!rst_n)
        led <= 1'd1;
    else 
        led <= ~led;
        
assign {led_red,led_green,led_blue} = {1'd1,led,1'd1};

endmodule

源代码下载链接：

链接：http://pan.baidu.com/s/1pKZTJAj 密码：pkf7

iCore4链接：