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Fix SV dma read function to work with unprintable chars and fix string not cleared issue #412

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Fix SV dma read function to work with unprintable chars and fix string not cleared issue #412

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15 changes: 8 additions & 7 deletions hdk/common/verif/include/sh_dpi_tasks.svh
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,8 @@
`ifndef SV_SH_DPI_TASKS
`define SV_SH_DPI_TASKS

`define BUF_SIZE 64

import tb_type_defines_pkg::*;

import "DPI-C" context task test_main(output int unsigned exit_code);
Expand All @@ -24,7 +26,7 @@ import tb_type_defines_pkg::*;
import "DPI-C" context function byte host_memory_getc(input longint unsigned addr);

`ifdef DMA_TEST
import "DPI-C" context task send_rdbuf_to_c(input string a);
import "DPI-C" context task send_rdbuf_to_c(input byte a[`BUF_SIZE + 8]);
`endif

export "DPI-C" task sv_printf;
Expand Down Expand Up @@ -246,11 +248,11 @@ end
int timeout_count, status, error_count;
logic [63:0] host_memory_buffer_address;
byte rd_buf_t;
string rd_buffer_t, rd_buffer;
byte rd_buffer[`BUF_SIZE + 8];

host_memory_buffer_address = 64'h0 + (chan+1)*64'h0_0001_3000;

que_cl_to_buffer(.slot_id(0), .chan(chan), .dst_addr(host_memory_buffer_address), .cl_addr(cl_addr), .len(buf_size));
que_cl_to_buffer(.slot_id(0), .chan(chan), .dst_addr(host_memory_buffer_address), .cl_addr(cl_addr), .len(`BUF_SIZE));
start_que_to_buffer(.slot_id(0), .chan(chan));
timeout_count = 0;
do begin
Expand All @@ -265,14 +267,13 @@ end
end
//For Questa simulator the first 8 bytes are not transmitted correctly, so the buffer is transferred with 8 extra bytes and those bytes are removed here.
for (int i = 0 ; i < 8; i++) begin
rd_buffer = {rd_buffer, "A"};
rd_buffer[i] = 8'h41;
end
for (int i = 0 ; i < buf_size ; i++) begin
for (int i = 0 ; i < `BUF_SIZE; i++) begin
rd_buf_t = hm_get_byte(.addr(host_memory_buffer_address + i));
//Change the ascii characters back to string.
$sformat(rd_buffer_t, "%s", rd_buf_t);
//Construct the rd_buffer.
rd_buffer = {rd_buffer, rd_buffer_t};
rd_buffer[i+8] = rd_buf_t;
end
//This function is needed to update buffer on C side.
send_rdbuf_to_c(rd_buffer);
Expand Down