STM32 EEPROM Emulation (#3741)

* STM32 EEPROM Emulation

- Added EEPROM emulation libaries from libmaple and Arduino_STM32. https://github.com/rogerclarkmelbourne/Arduino_STM32 and https://github.com/leaflabs/libmaple.
- Renamed teensy EEPROM library and added conditional selection of library.
- Remapped EEPROM memory map for 16 byte blocks (as is with STM32f3xx MCUs).
- Added EEPROM initialization in main.c of Chibios.
- Added EEPROM format to clear the emulated pages when EEPROM is marked as invalid.

* Fixed ifdef

1 files changed, 89 insertions, 0 deletions

diff --git a/tmk_core/common/chibios/eeprom_stm32.h b/tmk_core/common/chibios/eeprom_stm32.h
new file mode 100755
index 000000000..d06d30266
--- /dev/null
+++ b/tmk_core/common/chibios/eeprom_stm32.h
@@ -0,0 +1,89 @@
+/*
+ * This software is experimental and a work in progress.
+ * Under no circumstances should these files be used in relation to any critical system(s).
+ * Use of these files is at your own risk.
+ *
+ * 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.
+ *
+ * This files are free to use from https://github.com/rogerclarkmelbourne/Arduino_STM32 and 
+ * https://github.com/leaflabs/libmaple
+ *
+ * Modifications for QMK and STM32F303 by Yiancar
+ */
+
+// This file must be modified if the MCU is not defined below.
+// This library also assumes that the pages are not used by the firmware.
+
+#ifndef __EEPROM_H
+#define __EEPROM_H
+
+#include "ch.h"
+#include "hal.h"
+#include "flash_stm32.h"
+
+// HACK ALERT. This definition may not match your processor
+// To Do. Work out correct value for EEPROM_PAGE_SIZE on the STM32F103CT6 etc 
+#define MCU_STM32F303CC
+
+#ifndef EEPROM_PAGE_SIZE
+    #if defined (MCU_STM32F103RB)
+        #define EEPROM_PAGE_SIZE    (uint16_t)0x400  /* Page size = 1KByte */
+    #elif defined (MCU_STM32F103ZE) || defined (MCU_STM32F103RE) || defined (MCU_STM32F103RD) || defined (MCU_STM32F303CC)
+        #define EEPROM_PAGE_SIZE    (uint16_t)0x800  /* Page size = 2KByte */
+    #else
+        #error  "No MCU type specified. Add something like -DMCU_STM32F103RB to your compiler arguments (probably in a Makefile)."
+    #endif
+#endif
+
+#ifndef EEPROM_START_ADDRESS
+    #if defined (MCU_STM32F103RB)
+        #define EEPROM_START_ADDRESS    ((uint32_t)(0x8000000 + 128 * 1024 - 2 * EEPROM_PAGE_SIZE))
+    #elif defined (MCU_STM32F103ZE) || defined (MCU_STM32F103RE)
+        #define EEPROM_START_ADDRESS    ((uint32_t)(0x8000000 + 512 * 1024 - 2 * EEPROM_PAGE_SIZE))
+    #elif defined (MCU_STM32F103RD)
+        #define EEPROM_START_ADDRESS    ((uint32_t)(0x8000000 + 384 * 1024 - 2 * EEPROM_PAGE_SIZE))
+    #elif defined (MCU_STM32F303CC)
+        #define EEPROM_START_ADDRESS    ((uint32_t)(0x8000000 + 250 * 1024 - 2 * EEPROM_PAGE_SIZE))
+    #else
+        #error  "No MCU type specified. Add something like -DMCU_STM32F103RB to your compiler arguments (probably in a Makefile)."
+    #endif
+#endif
+
+/* Pages 0 and 1 base and end addresses */
+#define EEPROM_PAGE0_BASE       ((uint32_t)(EEPROM_START_ADDRESS + 0x000))
+#define EEPROM_PAGE1_BASE       ((uint32_t)(EEPROM_START_ADDRESS + EEPROM_PAGE_SIZE))
+
+/* Page status definitions */
+#define EEPROM_ERASED           ((uint16_t)0xFFFF)  /* PAGE is empty */
+#define EEPROM_RECEIVE_DATA     ((uint16_t)0xEEEE)  /* PAGE is marked to receive data */
+#define EEPROM_VALID_PAGE       ((uint16_t)0x0000)  /* PAGE containing valid data */
+
+/* Page full define */
+enum uint16_t
+    {
+    EEPROM_OK               = ((uint16_t)0x0000),
+    EEPROM_OUT_SIZE         = ((uint16_t)0x0081),
+    EEPROM_BAD_ADDRESS      = ((uint16_t)0x0082),
+    EEPROM_BAD_FLASH        = ((uint16_t)0x0083),
+    EEPROM_NOT_INIT         = ((uint16_t)0x0084),
+    EEPROM_SAME_VALUE       = ((uint16_t)0x0085),
+    EEPROM_NO_VALID_PAGE    = ((uint16_t)0x00AB)
+    };
+
+#define EEPROM_DEFAULT_DATA     0xFFFF
+
+    uint16_t EEPROM_init(void);
+    uint16_t EEPROM_format(void);
+    uint16_t EEPROM_erases(uint16_t *);
+    uint16_t EEPROM_read (uint16_t address, uint16_t *data);
+    uint16_t EEPROM_write(uint16_t address, uint16_t data);
+    uint16_t EEPROM_update(uint16_t address, uint16_t data);
+    uint16_t EEPROM_count(uint16_t *);
+    uint16_t EEPROM_maxcount(void);
+
+#endif  /* __EEPROM_H */