Diff: SpiFlash25.cpp

Revision:

0:137807d94795

Child:

1:17246d2dfff3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SpiFlash25.cpp	Thu Dec 04 14:09:10 2014 +0000
@@ -0,0 +1,165 @@
+/* Library for SPI flash 25* devices.
+ * Copyright (c) 2014 Multi-Tech Systems
+ *
+ * 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 "SpiFlash25.h"
+
+SpiFlash25::SpiFlash25(PinName mosi, PinName miso, PinName sclk, PinName cs, int page_size)
+:   _spi(mosi, miso, sclk),
+    _cs(cs),
+    _page_size(page_size)
+{
+    _cs.write(1);
+    _spi.format(8, 3);
+    _spi.frequency(75000000);
+
+    _cs.write(0);
+    _spi.write(READ_IDENTIFICATION);
+    _id[ID_MANUFACTURER] = _spi.write(0x00);
+    _id[ID_MEM_TYPE] = _spi.write(0x00);
+    _id[ID_MEM_SIZE] = _spi.write(0x00);
+    _cs.write(1);
+
+    _mem_size = 1 << _id[ID_MEM_SIZE];
+}
+
+void SpiFlash25::format(int bits, int mode) {
+    _spi.format(bits, mode);
+}
+
+void SpiFlash25::frequency(int hz) {
+    _spi.frequency(hz);
+}
+
+bool SpiFlash25::read(int addr, int len, char* data) {
+    if (addr + len > _mem_size) {
+        return false;
+    }
+
+    enable_write();
+
+    _cs.write(0);
+    _spi.write(READ_DATA);
+    _spi.write(high_byte(addr));
+    _spi.write(mid_byte(addr));
+    _spi.write(low_byte(addr));
+
+    for (int i = 0; i < len; i++) {
+        data[i] = _spi.write(0x00);
+    }
+
+    _cs.write(1);
+
+    return true;
+}
+
+bool SpiFlash25::write(int addr, int len, const char* data) {
+    if (addr + len > _mem_size) {
+        return false;
+    }
+
+    int written = 0;
+    int write_size = 0;
+
+    while (written < len) {
+        write_size = _page_size - ((addr + written) % _page_size);
+        if (written + write_size > len) {
+            write_size = len - written;
+        }
+
+        if (! write_page(addr + written, write_size, data + written)) {
+            return false;
+        }
+
+        written += write_size;
+    }
+
+    return true;
+}
+
+char* SpiFlash25::read_id() {
+    return _id;
+}
+
+char SpiFlash25::read_status() {
+    char status;
+
+    _cs.write(0);
+    _spi.write(READ_STATUS);
+    status = _spi.write(0x00);
+    _cs.write(1);
+
+    return status;
+}
+
+void SpiFlash25::clear_sector(int addr) {
+    enable_write();
+
+    _cs.write(0);
+    _spi.write(SECTOR_ERASE);
+    _spi.write(high_byte(addr));
+    _spi.write(mid_byte(addr));
+    _spi.write(low_byte(addr));
+    _cs.write(1);
+
+    wait_for_write();
+}
+
+void SpiFlash25::clear_mem() {
+    enable_write();
+
+    _cs.write(0);
+    _spi.write(BULK_ERASE);
+    _cs.write(1);
+
+    wait_for_write();
+}
+
+bool SpiFlash25::write_page(int addr, int len, const char* data) {
+    enable_write();
+
+    _cs.write(0);
+    _spi.write(PAGE_PROGRAM);
+    _spi.write(high_byte(addr));
+    _spi.write(mid_byte(addr));
+    _spi.write(low_byte(addr));
+
+    for (int i = 0; i < len; i++) {
+        _spi.write(data[i]);
+    }
+
+    _cs.write(1);
+    wait_for_write();
+
+    return true;
+}
+
+void SpiFlash25::enable_write() {
+    _cs.write(0);
+    _spi.write(WRITE_ENABLE);
+    _cs.write(1);
+}
+
+void SpiFlash25::wait_for_write() {
+    while (read_status() & STATUS_WIP) {
+        wait_us(10);
+    }
+}
\ No newline at end of file