zynq fpga输出pwm
时间: 2023-06-27 12:02:41 浏览: 68
在ynq FPGA上实现PWM输出可以使用PL部分的GPIO控制器和定时器。以下是一个简单的示例代码,使用Zynq的AXI Timer和AXI GPIO IP核。
```verilog
module pwm (
input sys_clk,
output pwm_out
);
reg [31:0] counter;
reg [31:0] duty_cycle;
wire timer_int;
reg [31:0] timer_val;
assign pwm_out = (counter <= duty_cycle);
axi_timer timer (
.ACLK(sys_clk),
.TRESET(1'b0),
.TEN(1'b1),
.TVALUE(timer_val),
.TINT(timer_int)
);
axi_gpio gpio (
.GPIO_IO(pwm_out),
.GPIO_OEN(1'b1),
.GPIO_I(1'b0),
.GPIO_T(1'b0),
.GPIO_LSB(false),
.GPIO_WIDTH(1),
.GPIO_TRI(1'b0),
.GPIO_RESET(1'b0),
.ACLK(sys_clk)
);
always @(posedge sys_clk) begin
if (timer_int) begin
timer_val <= 0;
counter <= counter + 1;
if (counter == 100) counter <= 0;
if (counter == duty_cycle) counter <= 0;
end
end
always @(posedge sys_clk) begin
if (counter == 0) begin
duty_cycle <= 50;
end else if (counter == 25) begin
duty_cycle <= 75;
end else if (counter == 50) begin
duty_cycle <= 100;
end else if (counter == 75) begin
duty_cycle <= 25;
end
end
endmodule
```
该代码使用AXI Timer模块生成PWM信号的定时基准,并使用AXI GPIO模块输出PWM信号。该代码将PWM信号的占空比设置为25%,50%,75%和100%。您可以根据自己的需求修改占空比的设置。