Error (10028): Can't resolve multiple constant drivers for net "w_ptr_succ[0]"

[Altera_Forum]

Hey Guys!

We are a group of 3 people who trying to compile the following vhdl uart core:

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but, we keep getting an error saying Error (10028): Can't resolve multiple constant drivers for net "w_ptr_succ[0]" at numeric_std.vhd(1244)

We don't have idea of as resolve that problem. Someone would be able to us help? 

Thank you so much!!

Best Regards group NinhodosPardais at Federal University of Technology Brazil

[Altera_Forum]

Youn are driving here wrong: 

 w_ptr_succ <= std_logic_vector(unsigned(w_ptr_reg)+1); w_ptr_succ <= std_logic_vector(unsigned(r_ptr_reg)+1);  Obviously you need to insert a switch to decide which option to drive.

[Altera_Forum]

Seems rather like a copy and past error. I guess this is intended: 

r_ptr_succ <= std_logic_vector(unsigned(r_ptr_reg)+1);

[Altera_Forum]

thank you for help!!! I found the error... 

 w_ptr_succ <= std_logic_vector(unsigned(w_ptr_reg)+1); w_ptr_succ <= std_logic_vector(unsigned(r_ptr_reg)+1);  really is:  w_ptr_succ <= std_logic_vector(unsigned(w_ptr_reg)+1); r_ptr_succ <= std_logic_vector(unsigned(r_ptr_reg)+1);  Now compile... Thank you so much!!