FSMC refactor; SRAM test code

4 files changed, 91 insertions, 1 deletions

diff --git a/wirish/native_sram.cpp b/wirish/native_sram.cpp
new file mode 100644
index 0000000..5e8095f
--- /dev/null
+++ b/wirish/native_sram.cpp
@@ -0,0 +1,45 @@
+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2011 LeafLabs, LLC.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *****************************************************************************/
+
+#include "native_sram.h"
+#include "libmaple.h"
+#include "fsmc.h"
+#include "rcc.h"
+
+#ifdef BOARD_maple_native
+
+void initNativeSRAM(void) {
+    fsmc_nor_psram_reg_map *regs = FSMC_NOR_PSRAM1_BASE;
+
+    fsmc_sram_init_gpios();
+    rcc_clk_enable(RCC_FSMC);
+
+    regs->BCR = FSMC_BCR_WREN | FSMC_BCR_MWID_16BITS | FSMC_BCR_MBKEN;
+    fsmc_nor_psram_set_addset(regs, 0);
+    fsmc_nor_psram_set_datast(regs, 3);
+}
+
+#endif
diff --git a/wirish/native_sram.h b/wirish/native_sram.h
new file mode 100644
index 0000000..7724667
--- /dev/null
+++ b/wirish/native_sram.h
@@ -0,0 +1,43 @@
+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2011 LeafLabs, LLC.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *****************************************************************************/
+
+#ifdef BOARD_maple_native
+
+#ifndef _NATIVE_SRAM_H_
+#define _NATIVE_SRAM_H_
+
+/**
+ * Sets up the FSMC peripheral to use the SRAM chip on the Maple
+ * Native as an external segment of system memory space.
+ *
+ * This implementation is for the IS62WV51216BLL 8Mb chip (55ns
+ * timing, 512K x 16 bits).
+ */
+void initNativeSRAM(void);
+
+#endif
+
+#endif
diff --git a/wirish/rules.mk b/wirish/rules.mk
index cea34f5..3dd4b2d 100644
--- a/wirish/rules.mk
+++ b/wirish/rules.mk
@@ -27,6 +27,7 @@ cppSRCS_$(d) := wirish_math.cpp		 \
 		pwm.cpp 		 \
 		ext_interrupts.cpp	 \
 		wirish_digital.cpp	 \
+		native_sram.cpp		 \
 		boards.cpp
 
 cFILES_$(d) := $(cSRCS_$(d):%=$(d)/%)
diff --git a/wirish/wirish.cpp b/wirish/wirish.cpp
index 6d77bc8..c5a9e30 100644
--- a/wirish/wirish.cpp
+++ b/wirish/wirish.cpp
@@ -41,6 +41,7 @@
 #include "fsmc.h"
 #include "dac.h"
 #include "flash.h"
+#include "native_sram.h"
 
 void init(void) {
     /* make sure the flash is ready before spinning the high speed clock up */
@@ -48,7 +49,7 @@ void init(void) {
     flash_set_latency(FLASH_WAIT_STATE_2);
 
 #ifdef BOARD_maple_native
-    fsmc_native_sram_init();
+    initNativeSRAM();
 #endif
 
     /* initialize clocks  */