From: Pavel Pisa <ppisa@pikron.com>
Date: Sun, 30 Nov 2014 21:39:52 +0000 (+0100)
Subject: RoCoN: included command to test approximation of reciprocal computation.
X-Git-Url: http://rtime.felk.cvut.cz/gitweb/fpga/lx-cpu1/lx-rocon.git/commitdiff_plain/dfea3d5f15f5f15df479d00b1571c80390c00984

RoCoN: included command to test approximation of reciprocal computation.

Signed-off-by: Pavel Pisa <ppisa@pikron.com>
---

diff --git a/sw/app/rocon/appl_fpga.c b/sw/app/rocon/appl_fpga.c
index a0db72d..51385d0 100644
--- a/sw/app/rocon/appl_fpga.c
+++ b/sw/app/rocon/appl_fpga.c
@@ -69,6 +69,10 @@ volatile uint32_t *fpga_lx_master_receiver_done_div = (volatile uint32_t *)FPGA_
 volatile uint32_t *fpga_lx_master_reset = (volatile uint32_t *)FPGA_LX_MASTER_RESET;
 volatile uint32_t *fpga_lx_master_conf  = (volatile uint32_t *)FPGA_CONFIGURATION_FILE_ADDRESS;
 
+#define FPGA_FNCAPPROX_BASE               0x80023000
+
+volatile uint32_t *fpga_fncapprox_base  = (volatile uint32_t *)FPGA_FNCAPPROX_BASE;
+
 /* BUS measurement - values (shifting all bits) */
 #define MEAS_VAL1 0xAAAAAAAA
 #define MEAS_VAL2 0x55555555
diff --git a/sw/app/rocon/appl_fpga.h b/sw/app/rocon/appl_fpga.h
index ad66654..0897d31 100644
--- a/sw/app/rocon/appl_fpga.h
+++ b/sw/app/rocon/appl_fpga.h
@@ -109,6 +109,12 @@ extern volatile uint32_t *fpga_lx_master_receiver_done_div;
 #define FPGA_LX_MASTER_CONTROL_ADDRESS_MASK     0x0000FF00
 #define FPGA_LX_MASTER_CONTROL_DATA_LENGTH_MASK 0x000000FF
 
+/* Function approximation block */
+
+#define FPGA_FNCAPPROX_BASE               0x80023000
+
+extern volatile uint32_t *fpga_fncapprox_base;
+
 /* Configuration defines */
 
 #define FPGA_CONFIGURATION_FILE_ADDRESS 0xA1C00000
diff --git a/sw/app/rocon/appl_tests.c b/sw/app/rocon/appl_tests.c
index 387649e..ae19cf4 100644
--- a/sw/app/rocon/appl_tests.c
+++ b/sw/app/rocon/appl_tests.c
@@ -293,6 +293,39 @@ int cmd_do_testlxpwrstat(cmd_io_t *cmd_io, const struct cmd_des *des, char *para
   return 0;
 }
 
+int cmd_do_testfncapprox(cmd_io_t *cmd_io, const struct cmd_des *des, char *param[])
+{
+  char *ps = param[1];
+  unsigned long val;
+  unsigned long res;
+  long diff;
+  unsigned int  xb;
+  uint32_t x;
+  uint32_t xl;
+  uint64_t yl;
+
+  si_skspace(&ps);
+  if (si_ulong(&ps, &val, 0) < 0)
+      return -CMDERR_BADPAR;
+
+  x = val;
+  xb = __builtin_clz(x);
+  xl = x << xb;
+
+  *fpga_fncapprox_base = xl;
+
+  res = *fpga_fncapprox_base;
+
+  yl = (1LL << 62) / xl;
+
+  diff = yl - res;
+
+  printf("val=0x%08lx res=0x%08lx ref=0x%08lx diff=%ld\n",
+         val, res, (unsigned long)yl, diff);
+
+  return 0;
+}
+
 cmd_des_t const cmd_des_test_memusage = {0, 0,
                 "memusage", "report memory usage", cmd_do_test_memusage,
 {
@@ -360,6 +393,11 @@ cmd_des_t const cmd_des_testlxpwrstat = {0, 0,
                                      cmd_do_testlxpwrstat, {(void *)0}
                                     };
 
+cmd_des_t const cmd_des_testfncapprox = {0, 0,
+                                     "testfncapprox", "test of function approximator",
+                                     cmd_do_testfncapprox, {(void *)0}
+                                    };
+
 cmd_des_t const *const cmd_appl_tests[] =
 {
   &cmd_des_test_memusage,
@@ -376,5 +414,6 @@ cmd_des_t const *const cmd_appl_tests[] =
 #endif /*SDRAM_BASE*/
   &cmd_des_testlxpwrrx,
   &cmd_des_testlxpwrstat,
+  &cmd_des_testfncapprox,
   NULL
 };