alif/ospi_flash: Add ospi_flash_sleep helper function.

dpgeorge · dpgeorge · commit 3b92139766d6 · 2026-03-04T00:58:09.000+11:00
Signed-off-by: Damien George &lt;damien@micropython.org&gt;
diff --git a/ports/alif/ospi_flash.c b/ports/alif/ospi_flash.c
@@ -391,6 +391,11 @@ int ospi_flash_xip_restore(ospi_flash_t *self) {
 /******************************************************************************/
 // Top-level read/erase/write functions.
 
+void ospi_flash_sleep(void) {
+    ospi_flash_t *self = &global_flash;
+    ospi_flash_write_cmd(self, self->set->power_down_command);
+}
+
 int ospi_flash_erase_sector(uint32_t addr) {
     ospi_flash_t *self = &global_flash;
 
diff --git a/ports/alif/ospi_flash.h b/ports/alif/ospi_flash.h
@@ -73,6 +73,7 @@ typedef struct _ospi_flash_settings_t {
     uint8_t read_dummy_cycles;
     uint16_t write_command;
     uint16_t erase_command;
+    uint16_t power_down_command;
 } ospi_flash_settings_t;
 
 // Provided by the board when it enables OSPI.
@@ -97,6 +98,7 @@ int ospi_flash_xip_exit(struct _ospi_flash_t *self);
 // SPI flash interface.
 int ospi_flash_init(void);
 uintptr_t ospi_flash_get_xip_base(void);
+void ospi_flash_sleep(void);
 int ospi_flash_erase_sector(uint32_t addr);
 int ospi_flash_read(uint32_t addr, uint32_t len, uint8_t *dest);
 int ospi_flash_write(uint32_t addr, uint32_t len, const uint8_t *src);
diff --git a/ports/alif/ospi_flash_settings.h b/ports/alif/ospi_flash_settings.h
@@ -44,7 +44,8 @@
     .read_id_dummy_cycles = 4, \
     .read_command = 0xee11, \
     .write_command = 0x12ed, \
-    .erase_command = 0x21de
+    .erase_command = 0x21de, \
+    .power_down_command = 0xb946
 
 // Everspin EM.
 #define OSPI_FLASH_SETTINGS_EM \
@@ -61,7 +62,8 @@
     .read_id_dummy_cycles = 8, \
     .read_command = 0xfd, \
     .write_command = 0xc2, \
-    .erase_command = 0x21
+    .erase_command = 0x21, \
+    .power_down_command = 0xb9
 
 // ISSI IS25.
 #define OSPI_FLASH_SETTINGS_IS25 \
@@ -78,5 +80,7 @@
     .read_id_dummy_cycles = 8, \
     .read_command = 0xfd, \
     .write_command = 0xc2, \
-    .erase_command = 0x21
+    .erase_command = 0x21, \
+    .power_down_command = 0xb9
+
 #endif  // __OSPI_FLASH_SETTINGS_H__
