Signal related problem ----Stop the output (Urgent)

[Altera_Forum]

module simplemotion(motion,key_0, CLK_50M,VCC); 

output motion; input key_0; input CLK_50M; input VCC;     slowclock(CLK_50M, pulse);   wire pulse;     reg motion; always @(posedge pulse)  if (key_0==1)  motion = pulse;   stop(CLK_50M,c); wire c;    always @(posedge c)  if (c==1) motion =0; // in this step i am trying to stop the motion , however, i couldn't because motion cannot be multiple constant.        endmodule    module stop(CLK_50M,c); input CLK_50M; output c;   reg [20:0] count; always @(CLK_50M) count = count+1;   assign c = count[20]; endmodule       module slowclock(CLK_50M, pulse); input CLK_50M;  output pulse;   reg [15:0] counter; always @(posedge CLK_50M) counter<=counter+1;   assign pulse = counter[15]; endmodule   My code is wrong, i have been working on this for weeks, still can't stop sending out the pulse to the motor at some specific time.  Can anyone help? Thank you.

[Altera_Forum]

--- Quote Start ---    module simplemotion(motion,key_0, CLK_50M,VCC); output motion; input key_0; input CLK_50M; input VCC;     slowclock(CLK_50M, pulse);   wire pulse;     reg motion; always @(posedge pulse)  if (key_0==1)  motion = pulse;   stop(CLK_50M,c); wire c;    always @(posedge c)  if (c==1) motion =0; // in this step i am trying to stop the motion , however, i couldn't because motion cannot be multiple constant.     endmodule    module stop(CLK_50M,c); input CLK_50M; output c;   reg [20:0] count; always @(CLK_50M) count = count+1;   assign c = count[20]; endmodule       module slowclock(CLK_50M, pulse); input CLK_50M;  output pulse;   reg [15:0] counter; always @(posedge CLK_50M) counter<=counter+1;   assign pulse = counter[15]; endmodule   My code is wrong, i have been working on this for weeks, still can't stop sending out the pulse to the motor at some specific time.  Can anyone help? Thank you.  --- Quote End ---      Hi,  It seems to me the problem with your output c. Better to declare before the call . Please check by displaying before stop call and after stop call. In this way, you will get know the problem why it is not stopping.

[Altera_Forum]

HI, kkr, Thanks 

 I have already declared c as wire,  i can't compile it , it said Error (10028): Can't resolve multiple constant drivers for net "motion" at step.v(27)  My will is to stop sending pulse to the motor,,,,,however i can't...Do u know why

[Altera_Forum]

--- Quote Start ---  HI, kkr, Thanks  I have already declared c as wire,  i can't compile it , it said Error (10028): Can't resolve multiple constant drivers for net "motion" at step.v(27)  My will is to stop sending pulse to the motor,,,,,however i can't...Do u know why  --- Quote End ---    you just remove down declaration, and declare only above stop.

[Altera_Forum]

iT'S NOT WORKING... 

i just want to stop sending out the pulse