Hello,
I've to make working an AD5781 with a Spartan 6 FPGA. I'd like to control it using a simple VHDL driver and not a hudge SPI one but the dac doesn't work. I put a part of my vhdl driver as you can take a look and tell me what's wrong. Thanks in advance.
-- Data_to_send is "0" & "001" & "011111111110111000" & "11" (23 downto 0)
-- Sclk_temp is at 100KHz
sending_data : process(Data_to_send, Sclk_temp)
variable i : integer :=23;
begin
CLR <= '1';
LDAC <= '0';
Sclk <= Sclk_temp;
if rising_edge(Sclk_temp) then
if i>=0 then
Sync <= '0';
SDin <= data_to_send(i);
end if;
i:=i-1;
if i<-1 then
Sync <= '1';
if i<-2 then
i:=23;
end if;
end if;
end if;
end process sending_data;
