Implement LCD demo

rtl/system/ibex_demo_system.sv

@@ -38,7 +38,7 @@ module ibex_demo_system #(
   input  logic        td_i,     // JTAG test data input pad
   output logic        td_o      // JTAG test data output pad
 );
-  localparam logic [31:0] MEM_SIZE      = 64 * 1024; // 64 KiB
+  localparam logic [31:0] MEM_SIZE      = 128 * 1024; // 128 KiB
   localparam logic [31:0] MEM_START     = 32'h00100000;
   localparam logic [31:0] MEM_MASK      = ~(MEM_SIZE-1);
 

sw/c/common/demo_system.h

@@ -24,7 +24,9 @@
 
 #define NUM_PWM_MODULES 12
 
-#define DEFAULT_SPI SPI_FROM_BASE_ADDR(SPI0_BASE)
+#define LCD_SPI SPI_FROM_BASE_ADDR(SPI0_BASE)
+
+#define SYSCLK_FREQ 50000000
 
 /**
  * Writes character to default UART. Signature matches c stdlib function

sw/c/common/spi.c

@@ -20,3 +20,14 @@ void spi_send_byte_blocking(spi_t *spi, char c) {
 }
 
 spi_status_t spi_get_status(spi_t *spi) { return (spi_status_t)DEV_READ(spi->reg + SPI_STATUS_REG); }
+
+void spi_wait_idle(spi_t *spi) {
+  while ((spi_get_status(spi) & spi_status_fifo_empty) != spi_status_fifo_empty);
+}
+
+void spi_tx(spi_t *spi, const uint8_t *data, uint32_t len) {
+  spi_wait_idle(spi);
+  while (len--) {
+    spi_send_byte_blocking(spi, *data++);
+  }
+}

sw/c/common/spi.h

@@ -30,4 +30,7 @@ void spi_init(spi_t *spi, spi_reg_t reg, uint32_t speed);
 void spi_send_byte_blocking(spi_t *spi, char c);
 spi_status_t spi_get_status(spi_t *spi);
 
+void spi_wait_idle(spi_t *spi);
+void spi_tx(spi_t *spi, const uint8_t *data, uint32_t len);
+
 #endif  // SPI_H__

sw/c/demo/lcd_st7735/CMakeLists.txt

@@ -1,15 +1,42 @@
+# This is the same sets of compilation flags used in ibex CoreMark core_portme.mak.
+set(CMAKE_C_FLAGS "-mtune=sifive-3-series -O3 -falign-functions=16 -funroll-all-loops -finline-functions -falign-jumps=4 -mstrict-align")
 
 add_library(lcd_st7735_lib
 ${CMAKE_CURRENT_SOURCE_DIR}/../../../../vendor/display_drivers/core/lcd_base.c
 ${CMAKE_CURRENT_SOURCE_DIR}/../../../../vendor/display_drivers/core/lucida_console_10pt.c
 ${CMAKE_CURRENT_SOURCE_DIR}/../../../../vendor/display_drivers/core/lucida_console_12pt.c
+${CMAKE_CURRENT_SOURCE_DIR}/../../../../vendor/display_drivers/core/m3x6_16pt.c
 ${CMAKE_CURRENT_SOURCE_DIR}/../../../../vendor/display_drivers/st7735/lcd_st7735.c
 )
 
+add_library(coremark
+${CMAKE_CURRENT_SOURCE_DIR}/../../../../vendor/lowrisc_ibex/vendor/eembc_coremark/core_list_join.c
+${CMAKE_CURRENT_SOURCE_DIR}/../../../../vendor/lowrisc_ibex/vendor/eembc_coremark/core_main.c
+${CMAKE_CURRENT_SOURCE_DIR}/../../../../vendor/lowrisc_ibex/vendor/eembc_coremark/core_matrix.c
+${CMAKE_CURRENT_SOURCE_DIR}/../../../../vendor/lowrisc_ibex/vendor/eembc_coremark/core_state.c
+${CMAKE_CURRENT_SOURCE_DIR}/../../../../vendor/lowrisc_ibex/vendor/eembc_coremark/core_util.c
+${CMAKE_CURRENT_SOURCE_DIR}/../../../../vendor/lowrisc_ibex/vendor/eembc_coremark/barebones/cvt.c
+coremark/core_portme.c
+coremark/ee_printf.c
+)
+
+# core_main defines a `main` function, rename it to `coremark_main` instead.
+set_source_files_properties(
+  ${CMAKE_CURRENT_SOURCE_DIR}/../../../../vendor/lowrisc_ibex/vendor/eembc_coremark/core_main.c
+  PROPERTIES COMPILE_FLAGS -Dmain=coremark_main
+)
+
+target_include_directories(coremark PRIVATE
+${CMAKE_CURRENT_SOURCE_DIR}/../../../../vendor/lowrisc_ibex/vendor/eembc_coremark
+${CMAKE_CURRENT_SOURCE_DIR}/../../../../vendor/lowrisc_ibex/examples/sw/benchmarks/coremark/ibex
+)
+
+target_link_libraries(coremark common)
+
 # add_executable(lcd_st7735 main.c)
-add_executable(lcd_st7735 main.c lcd.c fractal_fixed.c fractal_float.c fractal_palette.c)
+add_executable(lcd_st7735 main.c lcd.c fractal_fixed.c fractal_float.c fractal_palette.c fbcon.c)
 
 # pull in core dependencies and additional i2c hardware support
-target_link_libraries(lcd_st7735 common lcd_st7735_lib)
+target_link_libraries(lcd_st7735 common lcd_st7735_lib coremark)
 
 target_include_directories(lcd_st7735 PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/../../../../vendor/display_drivers)

sw/c/demo/lcd_st7735/coremark/core_portme.c

@@ -0,0 +1,66 @@
+// Copyright 2018 Embedded Microprocessor Benchmark Consortium (EEMBC)
+// Copyright lowRISC contributors.
+// Licensed under the Apache License, Version 2.0, see LICENSE for details.
+// SPDX-License-Identifier: Apache-2.0
+
+#include "core_portme.h"
+#include "coremark.h"
+
+#include "demo_system.h"
+#include "timer.h"
+
+#define ITERATIONS 100
+
+#if VALIDATION_RUN
+volatile ee_s32 seed1_volatile = 0x3415;
+volatile ee_s32 seed2_volatile = 0x3415;
+volatile ee_s32 seed3_volatile = 0x66;
+#endif
+#if PERFORMANCE_RUN
+volatile ee_s32 seed1_volatile = 0x0;
+volatile ee_s32 seed2_volatile = 0x0;
+volatile ee_s32 seed3_volatile = 0x66;
+#endif
+#if PROFILE_RUN
+volatile ee_s32 seed1_volatile = 0x8;
+volatile ee_s32 seed2_volatile = 0x8;
+volatile ee_s32 seed3_volatile = 0x8;
+#endif
+volatile ee_s32 seed4_volatile = ITERATIONS;
+volatile ee_s32 seed5_volatile = 0;
+
+static uint64_t start_time_val, stop_time_val;
+
+void start_time(void) {
+    start_time_val = timer_read();
+}
+
+void stop_time(void) {
+    stop_time_val = timer_read();
+}
+
+CORE_TICKS get_time(void) {
+    return (CORE_TICKS)(stop_time_val - start_time_val);
+}
+
+secs_ret time_in_secs(CORE_TICKS ticks) {
+  secs_ret retval = ((secs_ret)ticks) / (secs_ret)SYSCLK_FREQ;
+  return retval;
+}
+
+ee_u32 default_num_contexts = 1;
+
+void portable_init(core_portable *p, int *argc, char *argv[]) {
+  p->portable_id = 1;
+}
+
+void portable_fini(core_portable *p) {
+  CORE_TICKS elapsed = get_time();
+  float coremark_mhz;
+
+  coremark_mhz = (1000000.0f * (float)ITERATIONS) / elapsed;
+
+  ee_printf("CoreMark / MHz: %f", coremark_mhz);
+
+  p->portable_id = 0;
+}