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fpga: Introduce CTS signals for UART

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Add incoming and outgoing CTS (Clear To Send) signals for the FPGA to
let the CH552 and FPGA signal each other that it is OK to send UART
data. The CTS signals indicate "OK to send" if high. If an incoming
CTS signal goes low, the receiver of that signal should immediatly
stop sending UART data.
This commit is contained in:
Jonas Thörnblad 2024-12-17 17:18:45 +01:00 • committed by Mikael Ågren
parent f3706dcfcc
commit ab4ef5fdf9
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GPG key ID: E02DA3D397792C46
7 changed files with 54 additions and 5 deletions
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hw/application_fpga/tb/application_fpga_verilator.cc
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@ -315,6 +315,7 @@ int main(int argc, char **argv, char **env)
uart_init(&u, &top.interface_tx, &top.interface_rx, BIT_DIV);
top.clk = 0;
top.interface_ch552_cts = 1;
while (!Verilated::gotFinish()) {
uint8_t to_host = 0;