Deny access to the SPI master in app mode

tillitis · Nov 14, 2024 · 9028a57 · 9028a57
1 parent 15ccb60
commit 9028a57
Showing 1 changed file with 17 additions and 7 deletions.
diff --git a/hw/application_fpga/core/tk1/rtl/tk1.v b/hw/application_fpga/core/tk1/rtl/tk1.v
@@ -467,8 +467,8 @@ module tk1 (
     spi_start        = 1'h0;
     spi_tx_data_vld  = 1'h0;
 
-    spi_enable       = write_data[0];
-    spi_tx_data      = write_data[7 : 0];
+    spi_enable       = write_data[0] & ~system_mode_reg;
+    spi_tx_data      = write_data[7 : 0] & ~{8{system_mode_reg}};
 
     if (cs) begin
       tmp_ready = 1'h1;
@@ -545,15 +545,21 @@ module tk1 (
         end
 
         if (address == ADDR_SPI_EN) begin
-          spi_enable_vld = 1'h1;
+          if (!system_mode_reg) begin
+            spi_enable_vld = 1'h1;
+          end
         end
 
         if (address == ADDR_SPI_XFER) begin
-          spi_start = 1'h1;
+          if (!system_mode_reg) begin
+            spi_start = 1'h1;
+          end
         end
 
         if (address == ADDR_SPI_DATA) begin
-          spi_tx_data_vld = 1'h1;
+          if (!system_mode_reg) begin
+            spi_tx_data_vld = 1'h1;
+          end
         end
 
       end
@@ -609,11 +615,15 @@ module tk1 (
         end
 
         if (address == ADDR_SPI_XFER) begin
-          tmp_read_data[0] = spi_ready;
+          if (!system_mode_reg) begin
+            tmp_read_data[0] = spi_ready;
+          end
         end
 
         if (address == ADDR_SPI_DATA) begin
-          tmp_read_data[7 : 0] = spi_rx_data;
+          if (!system_mode_reg) begin
+            tmp_read_data[7 : 0] = spi_rx_data;
+          end
         end
 
       end