diff --git a/gateware/logic/pid.py b/gateware/logic/pid.py index 4320f94..e737577 100644 --- a/gateware/logic/pid.py +++ b/gateware/logic/pid.py @@ -56,10 +56,13 @@ class PID(Module, AutoCSR): self.comb += [kp_signed.eq(self.kp.storage)] kp_mult = Signal((self.width + self.coeff_width, True)) - self.comb += [kp_mult.eq(self.error * kp_signed)] + kp_mult_reg = Signal((self.width + self.coeff_width, True)) + self.sync += kp_mult.eq(kp_mult_reg >> (self.coeff_width - 2)) + + self.comb += [kp_mult_reg.eq(self.error * kp_signed)] self.output_p = Signal((self.width, True)) - self.comb += [self.output_p.eq(kp_mult >> (self.coeff_width - 2))] + self.comb += [self.output_p.eq(kp_mult)] self.kp_mult = kp_mult @@ -71,8 +74,10 @@ class PID(Module, AutoCSR): self.comb += [ki_signed.eq(self.ki.storage)] self.ki_mult = Signal((1 + self.width + self.coeff_width, True)) + self.ki_mult_reg = Signal((1 + self.width + self.coeff_width, True)) + self.sync += self.ki_mult.eq(self.ki_mult_reg) + self.comb += self.ki_mult_reg.eq((self.error * ki_signed) >> 4) - self.comb += [self.ki_mult.eq((self.error * ki_signed) >> 4)] int_reg_width = self.width + self.coeff_width + 4 extra_width = int_reg_width - self.width @@ -110,15 +115,17 @@ class PID(Module, AutoCSR): self.kd = CSRStorage(self.coeff_width) kd_signed = Signal((self.coeff_width, True)) kd_mult = Signal((mult_width, True)) + kd_mult_reg = Signal((mult_width, True)) + self.sync += kd_mult.eq(kd_mult_reg) - self.comb += [kd_signed.eq(self.kd.storage), kd_mult.eq(self.error * kd_signed)] + self.comb += [kd_signed.eq(self.kd.storage), kd_mult_reg.eq(self.error * kd_signed >> (self.coeff_width - self.d_shift))] kd_reg = Signal((out_width, True)) kd_reg_r = Signal((out_width, True)) self.output_d = Signal((out_width, True)) self.sync += [ - kd_reg.eq(kd_mult >> (self.coeff_width - self.d_shift)), + kd_reg.eq(kd_mult), kd_reg_r.eq(kd_reg), self.output_d.eq(kd_reg - kd_reg_r), ] @@ -143,4 +150,10 @@ class PID(Module, AutoCSR): # sync is required here, otherwise we get artifacts when one of the # signals changes sign - self.sync += [self.pid_sum.eq(self.output_p + self.int_out + self.output_d)] + self.sync += [ + If( + self.running, + self.pid_sum.eq(self.output_p + self.int_out + self.output_d), + ) + .Else(self.pid_sum.eq(0)) + ]