From 9062b4980401b38cbe35838fd7d1e7bd9712f9d5 Mon Sep 17 00:00:00 2001 From: Daniel Jobson Date: Wed, 13 Nov 2024 16:13:16 +0100 Subject: [PATCH] Deny access to the SPI master in app mode MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Co-authored-by: Mikael Ågren --- hw/application_fpga/core/tk1/rtl/tk1.v | 24 +++++++++++++++++------- 1 file changed, 17 insertions(+), 7 deletions(-) diff --git a/hw/application_fpga/core/tk1/rtl/tk1.v b/hw/application_fpga/core/tk1/rtl/tk1.v index 71afd7d..97ef15d 100644 --- a/hw/application_fpga/core/tk1/rtl/tk1.v +++ b/hw/application_fpga/core/tk1/rtl/tk1.v @@ -474,8 +474,8 @@ 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; @@ -552,15 +552,21 @@ 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 @@ -616,11 +622,15 @@ 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