Different Frequency Serial Output

Features

• interface: UART 256000bps
• 16 x output channels
• output the LSB first.
• idle low or idle high
• a data pattern whose bit amount can be set from 1 to 256 bits.
• a 32-bit frequency pattern to determine the corresponding data bit rate.
• an 8-bit parameter to set the bit amount of data pattern.
• an 8-bit parameter to set the slow bit rate.
• an 8-bit parameter to set the fast bit rate.
• Control byte
  1. Enable: to enable the channel.
  2. Mode: 0 is one-shot mode; 1 is repeat mode.
• an 8-bit parameter to set the repeat times in repeat mode.

TODO

1. Modify the decoder
   • bit amount
   • repeat times
   • idle state
   • global enable signal
   • update slow period
   • update fast period
2. Modify control byte
   • rename start bit to enable bit
   • delete stop bit
   • change the position of mode bit
3. Add repeat times parameter
4. Modify data pattern depends on the bit-amount parameter
5. Global control
   • enable
   • idle state
6. serial_out module
   • add idle_state_i
   • add bit_amount_i
   • add repeat_time_i
7. UART timeout function

Bug List

1. Error occurs when the frequency parameter is 0.