From 26f12903dab2fafeaaefb02349763618ce96d070 Mon Sep 17 00:00:00 2001
From: Paul Selkirk <paul@psgd.org>
Date: Mon, 26 Oct 2015 15:18:58 -0400
Subject: Based on user/ft/stm32-dev-bridge, without the project-specific build
 directories (and duplicated code).

---
 fmc-test.c | 240 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 240 insertions(+)
 create mode 100644 fmc-test.c

(limited to 'fmc-test.c')

diff --git a/fmc-test.c b/fmc-test.c
new file mode 100644
index 0000000..0e8ff39
--- /dev/null
+++ b/fmc-test.c
@@ -0,0 +1,240 @@
+//------------------------------------------------------------------------------
+// main.c
+//------------------------------------------------------------------------------
+
+
+//------------------------------------------------------------------------------
+// Headers
+//------------------------------------------------------------------------------
+#include "stm32f4xx_hal.h"
+#include "stm-init.h"
+#include "stm-led.h"
+#include "stm-fmc.h"
+#include "stm-uart.h"
+
+//------------------------------------------------------------------------------
+// Defines
+//------------------------------------------------------------------------------
+
+
+//------------------------------------------------------------------------------
+// Macros
+//------------------------------------------------------------------------------
+
+
+//------------------------------------------------------------------------------
+// Variables
+//------------------------------------------------------------------------------
+RNG_HandleTypeDef rng_inst;
+
+// FT: "I changed some interesting-to-look-at-in-the-debugger values to be
+// volatile, so that my compiler wouldn't optimize/obscure them."
+
+volatile uint32_t data_diff = 0;
+volatile uint32_t addr_diff = 0;
+
+
+//------------------------------------------------------------------------------
+// Prototypes
+//------------------------------------------------------------------------------
+/* XXX move this to stm-rng.[ch] */
+static void MX_RNG_Init(void);
+
+int test_fpga_data_bus(void);
+int test_fpga_address_bus(void);
+
+
+//------------------------------------------------------------------------------
+// Defines
+//------------------------------------------------------------------------------
+#define TEST_NUM_ROUNDS		100000
+
+
+//------------------------------------------------------------------------------
+int main(void)
+//------------------------------------------------------------------------------
+{
+  int i;
+  
+  stm_init();
+
+  uart_send_string("Keep calm for Novena boot...\r\n");
+
+  // Blink blue LED for six seconds to not upset the Novena at boot.
+  led_on(LED_BLUE);
+  for (i = 0; i < 12; i++) {
+    HAL_Delay(500);
+    led_toggle(LED_BLUE);
+  }
+
+  // initialize rng
+  MX_RNG_Init();
+
+  // prepare fmc interface
+  fmc_init();
+
+  // turn on green led, turn off other leds
+  led_on(LED_GREEN);
+  led_off(LED_YELLOW);
+  led_off(LED_RED);
+  led_off(LED_BLUE);
+
+  // vars
+  volatile int data_test_ok = 0, addr_test_ok = 0, successful_runs = 0, failed_runs = 0, sleep = 0;
+
+  // main loop (test, until an error is detected)
+  while (1)
+    {
+      // test data bus
+      data_test_ok = test_fpga_data_bus();
+      // test address bus
+      addr_test_ok = test_fpga_address_bus();
+
+      uart_send_string("Data: ");
+      uart_send_integer(data_test_ok, 100000);
+      uart_send_string(", addr: ");
+      uart_send_integer(addr_test_ok, 100000);
+      uart_send_string("\r\n");
+
+      if (data_test_ok == TEST_NUM_ROUNDS &&
+	  addr_test_ok == TEST_NUM_ROUNDS) {
+	// toggle yellow led to indicate, that we are alive
+	led_toggle(LED_YELLOW);
+
+	successful_runs++;
+	sleep = 100;
+      } else {
+	led_on(LED_RED);
+	failed_runs++;
+	sleep = 2000;
+      }
+
+      uart_send_string("Success ");
+      uart_send_integer(successful_runs, 0);
+      uart_send_string(", fail ");
+      uart_send_integer(failed_runs, 0);
+      uart_send_string("\r\n\r\n");
+
+      HAL_Delay(sleep);
+    }
+
+  // should never reach this line
+}
+
+
+//------------------------------------------------------------------------------
+int test_fpga_data_bus(void)
+//------------------------------------------------------------------------------
+{
+  int c, ok;
+  uint32_t rnd, buf;
+  HAL_StatusTypeDef hal_result;
+
+  // run some rounds of data bus test
+  for (c=0; c<TEST_NUM_ROUNDS; c++)
+    {
+      data_diff = 0;
+      // try to generate "random" number
+      hal_result = HAL_RNG_GenerateRandomNumber(&rng_inst, &rnd);
+      if (hal_result != HAL_OK) break;
+
+      // write value to fpga at address 0
+      ok = fmc_write_32(0, &rnd);
+      if (ok != 0) break;
+
+      // read value from fpga
+      ok = fmc_read_32(0, &buf);
+      if (ok != 0) break;
+
+      // compare (abort testing in case of error)
+      if (buf != rnd)
+	{
+	  data_diff = buf;
+	  data_diff ^= rnd;
+
+	  uart_send_string("Data bus fail: expected ");
+	  uart_send_binary(rnd, 32);
+	  uart_send_string(", got ");
+	  uart_send_binary(buf, 32);
+	  uart_send_string(", diff ");
+	  uart_send_binary(data_diff, 32);
+	  uart_send_string("\r\n");
+
+	  break;
+	}
+    }
+
+  // return number of successful tests
+  return c;
+}
+
+
+//------------------------------------------------------------------------------
+int test_fpga_address_bus(void)
+//------------------------------------------------------------------------------
+{
+  int c, ok;
+  uint32_t rnd, buf;
+  HAL_StatusTypeDef hal_result;
+
+  // run some rounds of address bus test
+  for (c=0; c<TEST_NUM_ROUNDS; c++)
+    {
+      addr_diff = 0;
+      // try to generate "random" number
+      hal_result = HAL_RNG_GenerateRandomNumber(&rng_inst, &rnd);
+      if (hal_result != HAL_OK) break;
+
+      // we only have 2^22 32-bit words
+      //rnd &= 0x00FFFFFC;
+      rnd &= 0x0007FFFC;
+
+      // don't test zero addresses (fpga will store data, not address)
+      if (rnd == 0) continue;
+
+      // write dummy value to fpga at some non-zero address
+      ok = fmc_write_32(rnd, &buf);
+      if (ok != 0) break;
+
+      // read value from fpga
+      ok = fmc_read_32(0, &buf);
+      if (ok != 0) break;
+
+      // fpga receives address of 32-bit word, while we need
+      // byte address here to compare
+      buf <<= 2;
+
+      // compare (abort testing in case of error)
+      if (buf != rnd)
+	{
+	  addr_diff = buf;
+	  addr_diff ^= rnd;
+
+	  uart_send_string("Addr bus fail: expected ");
+	  uart_send_binary(rnd, 32);
+	  uart_send_string(", got ");
+	  uart_send_binary(buf, 32);
+	  uart_send_string(", diff ");
+	  uart_send_binary(addr_diff, 32);
+	  uart_send_string("\r\n");
+
+	  break;
+	}
+    }
+
+  return c;
+}
+
+
+//------------------------------------------------------------------------------
+static void MX_RNG_Init(void)
+//------------------------------------------------------------------------------
+{
+  rng_inst.Instance = RNG;
+  HAL_RNG_Init(&rng_inst);
+}
+
+
+//------------------------------------------------------------------------------
+// EOF
+//------------------------------------------------------------------------------
-- 
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