首先，您需要在 Vivado 中创建一个包含 wiz_clk 的设计。这通常包括：
Zynq Processing System (PS)
Clocking Wizard (wiz_clk)
AXI Interconnect（如果需要访问 PL 中的其他 IP）
配置 Clocking Wizard (wiz_clk) 以根据您的硬件需求生成所需的时钟。
在 Vivado 中生成 Bitstream，并导出硬件描述文件（例如，用于 PetaLinux 的 .hdf 文件）。
使用 PetaLinux 创建一个项目，并使用导出的硬件描述文件。
在 PetaLinux 项目中的设备树文件（system-user.dtsi）中，确保已添加 Clocking Wizard 的节点：
Copy
&clk_wiz_0 {
status = "okay";
};
编译并部署 PetaLinux 镜像到 Zynq 设备。
在 PetaLinux 中，编写一个 C 程序（例如 clock_config.c），以动态配置 wiz_clk。
// Constants for Zynq-7020 PLL hardware parameters // Reference: Xilinx Zynq-7000 SoC Technical Reference Manual (UG585)
#define MIN_VCO_FREQ 600.0
// Minimum VCO frequency in MHz
#define MAX_VCO_FREQ 1200.0
// Maximum VCO frequency in MHz
#define MIN_CLKFBOUT_MULT 2
// Minimum CLKFBOUT multiplier value
#define MAX_CLKFBOUT_MULT 64
// Maximum CLKFBOUT multiplier value
#define MIN_DIVCLK_DIVIDE 1 // Minimum input clock divider value
#define MAX_DIVCLK_DIVIDE 106 // Maximum input clock divider value
#define MIN_OUTPUT_FREQ 10.0 // Minimum output frequency in MHz
#define MAX_OUTPUT_FREQ 800.0 // Maximum output frequency in MHz
// Calculate the register value for a given output frequency
unsigned int calculate_clk_wiz_reg_value(double input_freq, double output_freq) {
unsigned int clkout0_divide = 1;
unsigned int clkfbout_mult = 1;
unsigned int divclk_divide = 1;
double best_err = 1e9;
double target_vco_freq = output_freq * clkout0_divide;
for (unsigned int mult = MIN_CLKFBOUT_MULT; mult <= MAX_CLKFBOUT_MULT; ++mult) {
for (unsigned int div = MIN_DIVCLK_DIVIDE; div <= MAX_DIVCLK_DIVIDE; ++div) {
double vco_freq = input_freq * mult / div;
if (vco_freq < MIN_VCO_FREQ || vco_freq > MAX_VCO_FREQ) {
continue;
}
double err = fabs(vco_freq - target_vco_freq);
if (err < best_err) {
best_err = err;
clkfbout_mult = mult;
divclk_divide = div;
}
}
}
// Combine the calculated values into a single register value
unsigned int clk_wiz_reg_value = (clkout0_divide << 8) | (clkfbout_mult << 16) | (divclk_divide << 24);
return clk_wiz_reg_value;
}
int main() {
double input_freq = 100.0; // Input frequency in MHz
double output_freq_1 = 50.0; // Desired output frequency 1 in MHz
double output_freq_2 = 75.0; // Desired output frequency 2 in MHz
// Calculate the Clocking Wizard register value for the desired output frequencies
unsigned int clk_wiz_reg_value_1 = calculate_clk_wiz_reg_value(input_freq, output_freq_1);
unsigned int clk_wiz_reg_value_2 = calculate_clk_wiz_reg_value(input_freq, output_freq_2);
if (clk_wiz_reg_value_1 != 0) {
printf("Clocking Wizard register value for output frequency 1: 0x%08X\n", clk_wiz_reg_value_1);
// ... (The rest of your original code here for output frequency 1)
}
if (clk_wiz_reg_value_2 != 0) {
printf("Clocking Wizard register value for output frequency 2: 0x%08X\n", clk_wiz_reg_value_2);
// ... (The rest of your original code here for output frequency 2)
}
}