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use integer saturation for dac value adjustment

This commit is contained in:
Peter McGoron 2022-10-20 19:43:13 -04:00
parent 2a300b9438
commit 12686391ee
1 changed files with 15 additions and 3 deletions
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18
firmware/rtl/control_loop/control_loop.v
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@ -296,7 +296,6 @@ wire signed[RTRUNC_WID-1:0] rtrunc =
*/ */
wire signed[DAC_DATA_WID-1:0] dac_adj_val; wire signed[DAC_DATA_WID-1:0] dac_adj_val;
reg signed[DAC_DATA_WID-1:0] stored_dac_val;
intsat #( intsat #(
.IN_LEN(RTRUNC_WID), .IN_LEN(RTRUNC_WID),
@ -306,6 +305,19 @@ intsat #(
.outp(dac_adj_val) .outp(dac_adj_val)
); );
reg signed[DAC_DATA_WID-1:0] stored_dac_val;
wire [DAC_DATA_WID:0] total_dac_val_add = stored_dac_val + dac_adj_val;
wire [DAC_DATA_WID-1:0] total_dac_val;
intsat #(
.IN_LEN(DAC_DATA_WID),
.LTRUNC(1)
) total_dac_trunc (
.inp(total_dac_val_add),
.outp(total_dac_val)
);
/**** Write to DAC ****/ /**** Write to DAC ****/
reg [DELAY_WID-1:0] timer = 0; reg [DELAY_WID-1:0] timer = 0;
@ -446,8 +458,8 @@ always @ (posedge clk) begin
arm_mul <= 0; arm_mul <= 0;
dac_arm <= 1; dac_arm <= 1;
dac_ss <= 1; dac_ss <= 1;
stored_dac_val <= stored_dac_val + dac_adj_val; stored_dac_val <= total_dac_val;
to_dac <= b'0001 << DAC_DATA_WID | (stored_dac_val + dac_adj_val); to_dac <= b'0001 << DAC_DATA_WID | total_dac_val;
state <= WAIT_ON_DAC; state <= WAIT_ON_DAC;
end end
WAIT_ON_DAC: if (dac_finished) begin WAIT_ON_DAC: if (dac_finished) begin