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[];
char buffer1[]; /* 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();
usart6.initialize();
usart6.printf("Hello,I am iCore4!\r\n");
LED_GREEN_ON;
/* USER CODE END 2 */ /* Infinite loop */
/* USER CODE BEGIN WHILE */
while ()
{
/* USER CODE END WHILE */ /* USER CODE BEGIN 3 */
if(usart6.receive_ok_flag == ){
usart6.receive_ok_flag = ;
for(i = ;i < ;i ++){
buffer[i] = tolower(usart6.receive_buffer[i]);
}
//±È½Ï½ÓÊÕÐÅÏ¢
if(memcmp(buffer,"ledr",strlen("ledr")) == ){ //ARMºìµÆÁÁ
LED_RED_ON;
LED_GREEN_OFF;
LED_BLUE_OFF;
uart4.printf("LEDR\n"); //´®¿Ú2Êä³ö
}
if(memcmp(buffer,"ledg",strlen("ledg")) == ){ //ARMÂ̵ÆÁÁ
LED_GREEN_ON;
LED_RED_OFF;
LED_BLUE_OFF;
uart4.printf("LEDG\n"); //´®¿Ú2Êä³ö
}
if(memcmp(buffer,"ledb",strlen("ledb")) == ){ //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 = ;
for(i = ;i < ;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 = 'b01001100_01000101_01000100_01010010_00001010,
ledg = 'b01001100_01000101_01000100_01000111_00001010,
ledb = 'b01001100_01000101_01000100_01000010_00001010; //---------------------------------rx---------------------------//
/* 接收模块 */
reg[:]j;
reg[:]data_in;
reg [:]receive_data,data_inr; always@(posedge uart_clk or negedge rst_n)
if(!rst_n)
begin
j <= 'd0;
data_in <= 'd0;
data_inr <= 'd0;
receive_data <= 'd0;
end
else case(j)
'd0: //判断起始标志
begin
if(!rx)
begin
data_in <= 'd0;
j <= j + 'd1;
end
else j <= j;
end
'd1,4'd2,'d3,4'd4,'d5,4'd6,'d7,4'd8: //接收数据
begin
j <= j + 'd1;
data_in <= {rx,data_in[:]};
end
'd9: //接收校验位
begin
receive_data <= {receive_data[:],data_in};
j <= j + 'd1;
end
'd10: //接收停止位
begin
j <= 'd0;
if(receive_data[:] == 'b00001010)
begin
data_inr <= receive_data;
end
end
default: j <= 'd0;
endcase //---------------------------------led---------------------------//
/*对比接收数据 */
reg [:]led; always@(posedge uart_clk or negedge rst_n)
if(!rst_n)
begin
led <= 'b101;
end
else if (data_inr == ledr)
led <= 'b011;
else if (data_inr == ledg)
led <= 'b101;
else if (data_inr == ledb)
led <= '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1
reg[:]i;
reg[:]data_out;
reg[:]cnt;
reg[:]GINGKO; always @(posedge uart_clk or negedge rst_n)
if (!rst_n)
begin
i <= 'd0;
tx_r <= 'd1; //空闲状态为1
cnt <= 'd0;
data_out <= 'd0;
GINGKO <= {'d71,8'd73,'d78,8'd71,'d75,8'd79,'d13,8'd10};
end
else //开始发送DATA
case(i)
'd0: begin //先发送起始位0
i <= i + 'd1;
{data_out,GINGKO[:]} <= GINGKO;
tx_r <= 'd0;
end
'd1,14'd2,'d3,14'd4,'d5,14'd6,'d7,14'd8: //tx_r
begin
i <= i + 'd1;
{data_out[:],tx_r} <= data_out; //串口发送时,低位在先
end
'd9: begin //1位奇偶校验位和1位停止位
i <= i + 'd1;
tx_r <= 'd1;
end
'd10: begin //1位停止位
if(cnt == 'd7)
begin
i <= i + 'd1;
cnt <= 'd0;
end
else
begin
i <= 'd0;
cnt <= cnt + 'd1;
end
end
'd115200: begin //定时约为1s
i <= 'd0;
GINGKO <= {'d71,8'd73,'d78,8'd71,'d75,8'd79,'d13,8'd10};
end
default: i <= i + 'd1; //i为其他无效数值时,直接转到退出TXD模块状态
endcase assign tx = tx_r; endmodule
源代码下载链接：
链接：http://pan.baidu.com/s/1nv836RZ 密码：iky7
iCore4链接：
