实验现象：
1、先烧写ARM程序，然后烧写FPGA程序。
2、打开串口精灵，会接收到字符GINGKO。
3、通过串口精灵发送命令可以控制ARM·LED和FPGA·LED。
核心代码：
int main(void){ /* USER CODE BEGIN 1 */ int i; char buffer[20]; char buffer1[20]; /* 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_UART4_Init(); /* USER CODE BEGIN 2 */ uart4.initialize(115200); usart6.initialize(115200); usart6.printf("Hello,I am iCore4!\r\n"); LED_GREEN_ON; /* 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; for(i = 0;i < 20;i ++){ buffer[i] = tolower(usart6.receive_buffer[i]); } //±È½Ï½ÓÊÕÐÅÏ¢ if(memcmp(buffer,"ledr",strlen("ledr")) == 0){ //ARMºìµÆÁÁ LED_RED_ON; LED_GREEN_OFF; LED_BLUE_OFF; uart4.printf("LEDR\n"); //´®¿Ú2Êä³ö } if(memcmp(buffer,"ledg",strlen("ledg")) == 0){ //ARMÂ̵ÆÁÁ LED_GREEN_ON; LED_RED_OFF; LED_BLUE_OFF; uart4.printf("LEDG\n"); //´®¿Ú2Êä³ö } if(memcmp(buffer,"ledb",strlen("ledb")) == 0){ //ARMÀ¶µÆÁÁ LED_BLUE_ON; LED_GREEN_OFF; LED_RED_OFF; uart4.printf("LEDB\n"); //´®¿Ú2Êä³ö } } if (uart4.receive_ok_flag){ //´®¿Ú2½ÓÊÕÍê³É uart4.receive_ok_flag = 0; for(i = 0;i < 20;i++){ buffer1[i] = uart4.receive_buffer[i]; } usart6.printf(buffer1); //´®¿Ú4Êä³ö } } /* USER CODE END 3 */} module txd_rxd( input rst_n, input uart_clk, input rx, output tx, output led_red, output led_green, output led_blue);//---------------------------parameter--------------------------//parameter ledr = 40'b01001100_01000101_01000100_01010010_00001010, ledg = 40'b01001100_01000101_01000100_01000111_00001010, ledb = 40'b01001100_01000101_01000100_01000010_00001010;//---------------------------------rx---------------------------///* 接收模块 */reg[3:0]j;reg[7:0]data_in;reg [39:0]receive_data,data_inr;always@(posedge uart_clk or negedge rst_n) if(!rst_n) begin j <= 4'd0; data_in <= 8'd0; data_inr <= 40'd0; receive_data <= 40'd0; end else case(j) 4'd0: //判断起始标志 begin if(!rx) begin data_in <= 8'd0; j <= j + 1'd1; end else j <= j; end 4'd1,4'd2,4'd3,4'd4,4'd5,4'd6,4'd7,4'd8: //接收数据 begin j <= j + 1'd1; data_in <= {rx,data_in[7:1]}; end 4'd9: //接收校验位 begin receive_data <= {receive_data[31:0],data_in}; j <= j + 1'd1; end 4'd10: //接收停止位 begin j <= 1'd0; if(receive_data[7:0] == 8'b00001010) begin data_inr <= receive_data; end end default: j <= 4'd0; endcase //---------------------------------led---------------------------///*对比接收数据 */reg [2:0]led; always@(posedge uart_clk or negedge rst_n) if(!rst_n) begin led <= 3'b101; end else if (data_inr == ledr) led <= 3'b011; else if (data_inr == ledg) led <= 3'b101; else if (data_inr == ledb) led <= 3'b110; assign {led_red,led_green,led_blue} = led;//---------------------------------tx---------------------------///*发送模块，定时发送GINGKO*/reg tx_r; //串行发送数据的寄存器,空闲状态默认为1reg[16:0]i;reg[7:0]data_out;reg[3:0]cnt;reg[63:0]GINGKO;always @(posedge uart_clk or negedge rst_n) if (!rst_n) begin i <= 17'd0; tx_r <= 1'd1; //空闲状态为1 cnt <= 4'd0; data_out <= 8'd0; GINGKO <= { 8'd71,8'd73,8'd78,8'd71,8'd75,8'd79,8'd13,8'd10}; end else //开始发送DATA case(i) 17'd0: begin //先发送起始位0 i <= i + 1'd1; {data_out,GINGKO[63:8]} <= GINGKO; tx_r <= 1'd0; end 17'd1,14'd2,14'd3,14'd4,14'd5,14'd6,14'd7,14'd8: //tx_r begin i <= i + 1'd1; {data_out[6:0],tx_r} <= data_out; //串口发送时,低位在先 end 17'd9: begin //1位奇偶校验位和1位停止位 i <= i + 1'd1; tx_r <= 1'd1; end 17'd10: begin //1位停止位 if(cnt == 4'd7) begin i <= i + 1'd1; cnt <= 4'd0; end else begin i <= 14'd0; cnt <= cnt + 1'd1; end end 17'd115200: begin //定时约为1s i <= 14'd0; GINGKO <= { 8'd71,8'd73,8'd78,8'd71,8'd75,8'd79,8'd13,8'd10}; end default: i <= i + 1'd1; //i为其他无效数值时,直接转到退出TXD模块状态 endcaseassign tx = tx_r; endmodule 源代码下载链接：
链接： 密码：iky7
iCore4链接：