From 3d16ad028d69acc581095430d20463ed66f65779 Mon Sep 17 00:00:00 2001
From: Fredrik Thulin <fredrik@thulin.net>
Date: Sat, 21 May 2016 13:16:58 +0200
Subject: Add code to access the keystore memory (SPI flash).

---
 stm-keystore.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 stm-keystore.c

(limited to 'stm-keystore.c')

diff --git a/stm-keystore.c b/stm-keystore.c
new file mode 100644
index 0000000..19c5ccc
--- /dev/null
+++ b/stm-keystore.c
@@ -0,0 +1,70 @@
+/*
+ * stm-keystore.c
+ * ----------
+ * Functions for accessing the keystore memory.
+ *
+ * Copyright (c) 2016, NORDUnet A/S All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * - Neither the name of the NORDUnet nor the names of its contributors may
+ *   be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "stm32f4xx_hal.h"
+#include "stm-keystore.h"
+#include "stm-init.h"
+
+SPI_HandleTypeDef hspi_keystore;
+
+struct spiflash_ctx keystore_ctx = {&hspi_keystore, KSM_PROM_CS_N_GPIO_Port, KSM_PROM_CS_N_Pin};
+
+int keystore_check_id()
+{
+    return n25q128_check_id(&keystore_ctx);
+}
+
+int keystore_write_data(uint32_t offset, const uint8_t *buf, const uint32_t len)
+{
+    return n25q128_write_data(&keystore_ctx, offset, buf, len);
+}
+
+int keystore_erase_sectors(int num)
+{
+    if (num > N25Q128_NUM_SECTORS - 1 || num < 0) num = N25Q128_NUM_SECTORS - 1;
+    while (num) {
+	int timeout = 1000;
+	while (timeout--) {
+	    int i = n25q128_get_wip_flag(&keystore_ctx);
+	    if (i < 0) return 0;
+	    if (! i) break;
+	    HAL_Delay(10);
+	}
+
+	if (! n25q128_erase_sector(&keystore_ctx, num--)) {
+            return 0;
+        }
+    }
+    return 1;
+}
-- 
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