// a short script to calaculate the baud rate generation parameters for the
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// a short script to calaculate the baud rate generation parameters for the
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// UART to Bus core
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// UART to Bus core
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mode(-1)
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mode(-1)
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// define the GCD function since Scilab prefers to use a different function as gcd
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// define the GCD function since Scilab prefers to use a different function as gcd
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function x = gcdn(a,b)
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function x = gcdn(a,b)
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x = zeros(length(b),length(a));
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x = zeros(length(b),length(a));
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for n=1:length(a),
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for n=1:length(a),
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for m=1:length(b),
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for m=1:length(b),
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x=a(n);
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x=a(n);
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y=b(m);
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y=b(m);
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while y~=0
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while y~=0
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r=modulo(x,y);
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r=modulo(x,y);
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x=y;
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x=y;
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y=r;
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y=r;
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end
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end
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x(m,n) = x;
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x(m,n) = x;
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end
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end
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end
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end
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endfunction
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endfunction
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// request the required clock rate and baud rate parameters
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// request the required clock rate and baud rate parameters
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dig_labels = ["Clock Frequency in MHz"; "UART Baud Rate in bps"];
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dig_labels = ["Clock Frequency in MHz"; "UART Baud Rate in bps"];
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default_val = ["40", "115200"];
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default_val = ["40"; "115200"];
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params = evstr(x_mdialog("Enter Core Parameters", dig_labels, default_val));
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params = evstr(x_mdialog("Enter Core Parameters", dig_labels, default_val));
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// extract the parameters
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// extract the parameters
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global_clock_freq = params(1)*1e6;
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global_clock_freq = params(1)*1e6;
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baud_rate = params(2);
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baud_rate = params(2);
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// calculate the baud rate generator parameters
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// calculate the baud rate generator parameters
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D_BAUD_FREQ = 16*baud_rate / gcdn(global_clock_freq, 16*baud_rate);
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D_BAUD_FREQ = 16*baud_rate / gcdn(global_clock_freq, 16*baud_rate);
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D_BAUD_LIMIT = (global_clock_freq / gcdn(global_clock_freq, 16*baud_rate)) - D_BAUD_FREQ;
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D_BAUD_LIMIT = (global_clock_freq / gcdn(global_clock_freq, 16*baud_rate)) - D_BAUD_FREQ;
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// print the values to the command window
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// print the values to the command window
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printf("Calculated core baud rate generator parameters:\n");
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printf("Calculated core baud rate generator parameters:\n");
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printf(" D_BAUD_FREQ = 12''d%d\n", D_BAUD_FREQ);
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printf(" D_BAUD_FREQ = 12''d%d\n", D_BAUD_FREQ);
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printf(" D_BAUD_LIMIT = 16''d%d\n", D_BAUD_LIMIT);
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printf(" D_BAUD_LIMIT = 16''d%d\n", D_BAUD_LIMIT);
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// open a message with the calculated values
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// open a message with the calculated values
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mes_str = ["Calculated core baud rate generator parameters:"; ...
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mes_str = ["Calculated core baud rate generator parameters:"; ...
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" D_BAUD_FREQ = "+string(D_BAUD_FREQ); ...
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" D_BAUD_FREQ = "+string(D_BAUD_FREQ); ...
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" D_BAUD_LIMIT = "+string(D_BAUD_LIMIT); ...
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" D_BAUD_LIMIT = "+string(D_BAUD_LIMIT); ...
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""; ...
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""; ...
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"The verilog definition can be copied from the following lines:"; ...
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"The verilog definition can be copied from the following lines:"; ...
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"`define D_BAUD_FREQ 12''d"+string(D_BAUD_FREQ); ...
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"`define D_BAUD_FREQ 12''d"+string(D_BAUD_FREQ); ...
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"`define D_BAUD_LIMIT 16''d"+string(D_BAUD_LIMIT);
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"`define D_BAUD_LIMIT 16''d"+string(D_BAUD_LIMIT);
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];
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];
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x_message_modeless(mes_str);
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messagebox(mes_str);
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