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stm32: Add support for STM32N6xx MCUs.

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This commit adds preliminary support for ST's new STM32N6xx MCUs.

Supported features of this MCU so far are:
- basic clock tree initialisation, running at 800MHz
- fully working USB
- XSPI in memory-mapped mode
- machine.Pin
- machine.UART
- RTC and deepsleep support
- SD card
- filesystem
- ROMFS
- WiFi and BLE via cyw43-driver (SDIO backend)

Note that the N6 does not have internal flash, and has some tricky boot
sequence, so using a custom bootloader (mboot) is almost a necessity.

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George
2024-06-18 17:46:21 +10:00
parent 24fd5f7268
commit eb3ea9ee13
42 changed files with 1659 additions and 135 deletions
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20
ports/stm32/mpu.h
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@@ -137,18 +137,26 @@ static inline void mpu_config_end(uint32_t irq_state) {
enable_irq(irq_state);
}
#elif defined(STM32H5)
#elif defined(STM32H5) || defined(STM32N6)
#define MPU_REGION_SIG (MPU_REGION_NUMBER0)
#define MPU_REGION_ETH (MPU_REGION_NUMBER1)
#define MPU_REGION_LAST_USED (MPU_REGION_NUMBER1)
#define MPU_REGION_DMA_UNCACHED_1 (MPU_REGION_NUMBER2)
#define MPU_REGION_DMA_UNCACHED_2 (MPU_REGION_NUMBER3)
#define MPU_REGION_LAST_USED (MPU_REGION_NUMBER3)
#define ST_DEVICE_SIGNATURE_BASE (0x08fff800)
#define ST_DEVICE_SIGNATURE_LIMIT (0x08ffffff)
// STM32H5 Cortex-M33 MPU works differently from older cores.
// Macro only takes region size in bytes, Attributes are coded in mpu_config_region().
#define MPU_CONFIG_DISABLE (0)
#define MPU_CONFIG_ETH(size) (size)
#define MPU_CONFIG_UNCACHED(size) (size)
#if defined(STM32N6)
#define MPU_REGION_SIZE_32B (32)
#endif
static inline void mpu_init(void) {
// Configure attribute 0, inner-outer non-cacheable (=0x44).
@@ -180,8 +188,12 @@ static inline uint32_t mpu_config_start(void) {
}
static inline void mpu_config_region(uint32_t region, uint32_t base_addr, uint32_t size) {
if (region == MPU_REGION_ETH) {
// Configure region 1 to make DMA memory non-cacheable.
if (size == 0) {
// Disable MPU for this region.
MPU->RNR = region;
MPU->RLAR &= ~MPU_RLAR_EN_Msk;
} else if (region == MPU_REGION_ETH || region == MPU_REGION_DMA_UNCACHED_1 || region == MPU_REGION_DMA_UNCACHED_2) {
// Configure region to make DMA memory non-cacheable.
__DMB();
// Configure attribute 1, inner-outer non-cacheable (=0x44).