Add support for 64MB SDRAM used as extra heap

Author: snkYmkrct

ports/stm/Makefile

@@ -169,6 +169,13 @@ ifeq ($(MCU_VARIANT),$(filter $(MCU_VARIANT),STM32F765xx STM32F767xx STM32F769xx
 	SRC_STM32 += $(HAL_DIR)/Src/stm32$(MCU_SERIES_LOWER)xx_hal_uart_ex.c
 endif
 
+ifeq ($(MCU_VARIANT),$(filter $(MCU_VARIANT),STM32H750xx))
+	C_DEFS += -DHAL_SDRAM_MODULE_ENABLED
+	SRC_STM32 += st_driver/stm32$(MCU_SERIES_LOWER)xx_hal_driver/Src/stm32h7xx_hal_sdram.c
+	SRC_STM32 += st_driver/stm32$(MCU_SERIES_LOWER)xx_hal_driver/Src/stm32h7xx_ll_fmc.c
+	SRC_C += peripherals/sdram.c
+endif
+
 SRC_STM32 += boards/system_stm32$(MCU_SERIES_LOWER)xx.c
 
 SRC_C += \

ports/stm/boards/daisy_seed_with_sdram/mpconfigboard.h

@@ -31,3 +31,40 @@
 
 // for RNG not audio
 #define CPY_CLK_USB_USES_AUDIOPLL (1)
+
+// SDRAM -- on FMC controller
+
+#define CPY_SDRAM_REGION        MPU_REGION_NUMBER10
+#define CPY_SDRAM_REGION_SIZE   MPU_REGION_SIZE_64MB
+
+#define CIRCUITPY_HW_FMC_SDCKE0
+#define CIRCUITPY_HW_FMC_SDNE0
+
+#define CIRCUITPY_HW_SDRAM_SIZE               (64 * 1024 * 1024)  // 64 MByte
+#define CIRCUITPY_HW_SDRAM_STARTUP_TEST       (1)
+#define CIRCUITPY_HW_FMC_SWAP_BANKS           (0)
+
+#define CIRCUITPY_HW_SDRAM_CLOCK_PERIOD       2
+#define CIRCUITPY_HW_SDRAM_CAS_LATENCY        3
+#define CIRCUITPY_HW_SDRAM_FREQUENCY_KHZ      (100000) // 100 MHz
+#define CIRCUITPY_HW_SDRAM_TIMING_TMRD        (2)
+#define CIRCUITPY_HW_SDRAM_TIMING_TXSR        (8)
+#define CIRCUITPY_HW_SDRAM_TIMING_TRAS        (5)
+#define CIRCUITPY_HW_SDRAM_TIMING_TRC         (6)
+#define CIRCUITPY_HW_SDRAM_TIMING_TWR         (3)
+#define CIRCUITPY_HW_SDRAM_TIMING_TRP         (2)
+#define CIRCUITPY_HW_SDRAM_TIMING_TRCD        (2)
+
+#define CIRCUITPY_HW_SDRAM_ROW_BITS_NUM       13
+#define CIRCUITPY_HW_SDRAM_MEM_BUS_WIDTH      32
+#define CIRCUITPY_HW_SDRAM_REFRESH_CYCLES     8192
+
+#define CIRCUITPY_HW_SDRAM_COLUMN_BITS_NUM    9
+#define CIRCUITPY_HW_SDRAM_INTERN_BANKS_NUM   4
+#define CIRCUITPY_HW_SDRAM_RPIPE_DELAY        0
+#define CIRCUITPY_HW_SDRAM_RBURST             (1)
+#define CIRCUITPY_HW_SDRAM_WRITE_PROTECTION   (0)
+
+#define CIRCUITPY_HW_SDRAM_AUTOREFRESH_NUM    (8)
+#define CIRCUITPY_HW_SDRAM_BURST_LENGTH       4
+#define CIRCUITPY_HW_SDRAM_REFRESH_RATE       (64) // ms