Refactor Winbond w25n02k support

This is being done as part of support for NEXUSX target.
The previously introduced target ORBITH743 has already
introduced support for the Winbond w25n02k 2Gbit/256MByte
array. This commit refactors it to increase code quality.

flash_w25n01g.c is renamed to flash_w25n.c.
The driver no longer supports just w25n01g,
but two chips of the w25n family now.
More chips might be added in future targets.
The name change reflects this new larger family support.

Cleanup of some magic numbers in flash_w25n.c

Removal of w25n01g_readExtensionBytes.
It had a magic number in it and was unused.
Rather than fixing the magic number it just gets removed.

Addition of USE_FLASH_W25N02K and use of it in targets.
Keeps target definitions more accurate and independent of
flash driver implementation details.

Author: functionpointer

cmake/at32-bootloader.cmake

@@ -21,7 +21,7 @@ main_sources(BOOTLOADER_SOURCES
     drivers/time.c
     drivers/timer.c
     drivers/flash_m25p16.c
-    drivers/flash_w25n01g.c 
+    drivers/flash_w25n.c
     drivers/flash.c
 
     fc/firmware_update_common.c

docs/Blackbox.md

@@ -120,6 +120,8 @@ These chips are also supported:
 * Winbond W25Q64 - 64 Mbit / 8 MByte
 * Micron N25Q0128 - 128 Mbit / 16 MByte
 * Winbond W25Q128 - 128 Mbit / 16 MByte
+* Winbond W25N01  - 1 Gbit / 128 MByte
+* Winbond W25N02  - 2 Gbit / 256 MByte
 
 #### Enable recording to dataflash
 On the Configurator's CLI tab, you must enter `set blackbox_device=SPIFLASH` to switch to logging to an onboard dataflash chip, then save.

src/main/CMakeLists.txt

@@ -179,8 +179,8 @@ main_sources(COMMON_SRC
     drivers/flash.h
     drivers/flash_m25p16.c
     drivers/flash_m25p16.h
-    drivers/flash_w25n01g.c
-    drivers/flash_w25n01g.h
+    drivers/flash_w25n.c
+    drivers/flash_w25n.h
     drivers/gimbal_common.h
     drivers/gimbal_common.c
     drivers/headtracker_common.h

src/main/drivers/bus.h

@@ -142,7 +142,7 @@ typedef enum {
     DEVHW_MS4525,       // Pitot meter
     DEVHW_DLVR,         // Pitot meter
     DEVHW_M25P16,       // SPI NOR flash
-    DEVHW_W25N01G,      // SPI 128MB flash
+    DEVHW_W25N,         // SPI 128MB or 256MB flash from Winbond W25N family
     DEVHW_UG2864,       // I2C OLED display
     DEVHW_SDCARD,       // Generic SD-Card
     DEVHW_IRLOCK,       // IR-Lock visual positioning hardware

src/main/drivers/flash.c

@@ -30,7 +30,7 @@
 
 #include "flash.h"
 #include "flash_m25p16.h"
-#include "flash_w25n01g.h"
+#include "flash_w25n.h"
 
 #include "common/time.h"
 
@@ -56,17 +56,17 @@ static flashDriver_t flashDrivers[] = {
     },
 #endif
 
-#ifdef USE_FLASH_W25N01G
+#if defined(USE_FLASH_W25N01G) || defined(USE_FLASH_W25N02K)
     {
-        .init = w25n01g_init,
-        .isReady = w25n01g_isReady,
-        .waitForReady = w25n01g_waitForReady,
-        .eraseSector = w25n01g_eraseSector,
-        .eraseCompletely = w25n01g_eraseCompletely,
-        .pageProgram = w25n01g_pageProgram,
-        .readBytes = w25n01g_readBytes,
-        .getGeometry = w25n01g_getGeometry,
-        .flush = w25n01g_flush
+        .init = w25n_init,
+        .isReady = w25n_isReady,
+        .waitForReady = w25n_waitForReady,
+        .eraseSector = w25n_eraseSector,
+        .eraseCompletely = w25n_eraseCompletely,
+        .pageProgram = w25n_pageProgram,
+        .readBytes = w25n_readBytes,
+        .getGeometry = w25n_getGeometry,
+        .flush = w25n_flush
     },
 #endif