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Fixes #8 ch5 audio #9

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Fixes #8 ch5 audio #9

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e4f69e4
Update tb_pdm.sv
electropaultje Dec 26, 2023
15fb903
Fix sampling overflow and sampling interval for counter[1]
electropaultje Dec 26, 2023
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12 changes: 6 additions & 6 deletions CH5/hdl/pdm_inputs.sv
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Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,8 @@ module pdm_inputs

initial begin
sample_counter = '0;
counter = '0;
counter[0] = '0;
counter[1] = 8'd100;
m_clk = '0;
clk_counter = '0;
end
Expand All @@ -41,7 +42,6 @@ module pdm_inputs
m_clk_en <= ~m_clk;
end else begin
clk_counter <= clk_counter + 1;
if (clk_counter == CLK_COUNT - 2) m_clk_en <= ~m_clk;
end

if (m_clk_en) begin
Expand All @@ -52,15 +52,15 @@ module pdm_inputs
amplitude <= sample_counter[0];
amplitude_valid <= '1;
sample_counter[0] <= '0;
end else if (counter[0] < 128) begin
end else if (counter[0] < 127) begin
sample_counter[0] <= sample_counter[0] + m_data;
end
if (counter[1] == 227) begin
if (counter[1] == 199) begin
counter[1] <= '0;
amplitude <= sample_counter[1] + m_data;
amplitude <= sample_counter[1];
amplitude_valid <= '1;
sample_counter[1] <= '0;
end else if (counter[1] > 100) begin
end else if (counter[1] <127) begin
sample_counter[1] <= sample_counter[1] + m_data;
end
end
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4 changes: 2 additions & 2 deletions CH5/tb/tb_pdm.sv
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Original file line number Diff line number Diff line change
Expand Up @@ -92,9 +92,9 @@ module tb_pdm;
int_count <= int_count + 1'b1;
if (&int_count) counter <= counter + 1'b1;
if (counter > 127) begin
data_in <= ~sin_table[counter[6:0]] + 1'b1;
data_in <= 7'h40 - sin_table[counter[6:0]];
end else begin
data_in <= sin_table[counter[6:0]];
data_in <= 7'h40 + sin_table[counter[6:0]];
end
end

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