Tang Nano 20K PicoRV32 + SimpleUART

9 months ago

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Tang Nano 20K PicoRV32 + SimpleUART

前面早就移植过PicoRV32,这个内核相当简单,当然它也可以像其他内核一样搞一个Wishbone或者AXI的总线,之前总有人觉得,通过GAO看不到Message,不知道是不是正常运行,行吧,那就把官方的SimpleUART也拿来用.

由于我不想改hex文件,所以那就改逻辑,让他上电时候执行到位置就开始给串口打东西.


wire uart_wait;

simpleuart #(
.DEFAULT_DIV(234)
) simpleuart_inst (
   .clk(clk),
   .resetn(!resetn),
   .ser_tx(ser_tx),
   .reg_dat_we(mem_valid && !mem_ready && |mem_wstrb && mem_addr == 32'h1000_0000),
   .reg_dat_di(mem_wdata),
   .reg_dat_wait(uart_wait)
);

分频系数是27MHz / 115200 ≈ 234,再把mem_ready条件修改一下.

    mem_ready <= (mem_valid && !mem_ready && m_read_en) || 
                 (mem_valid && !mem_ready && |mem_wstrb && mem_addr == 32'h1000_0000 && !uart_wait);

最后约束并烧录.

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