add flash and PSRAM CS IO acquire function

components/esp32s2/include/esp32s2/spiram.h

@@ -78,6 +78,15 @@ size_t esp_spiram_get_size(void);
  */
 void esp_spiram_writeback_cache(void);
 
+/**
+ * @brief get psram CS IO
+ *
+ * This interface should be called after PSRAM is enabled, otherwise it will
+ * return an invalid value -1/0xff.
+ *
+ * @return psram CS IO or -1/0xff if psram not enabled
+ */
+uint8_t esp_spiram_get_cs_io(void);
 
 
 /**

components/esp32s2/spiram.c

@@ -376,6 +376,11 @@ void IRAM_ATTR esp_spiram_writeback_cache(void)
 
 
 
+uint8_t esp_spiram_get_cs_io(void)
+{
+    return psram_get_cs_io();
+}
+
 /*
  Simple RAM test. Writes a word every 32 bytes. Takes about a second to complete for 4MiB. Returns
  true when RAM seems OK, false when test fails. WARNING: Do not run this before the 2nd cpu has been
@@ -414,4 +419,5 @@ bool esp_spiram_test(void)
         return true;
     }
 }
+
 #endif

components/esp32s2/spiram_psram.c

@@ -168,6 +168,13 @@ static uint32_t s_psram_id = 0;
 static void IRAM_ATTR psram_cache_init(psram_cache_mode_t psram_cache_mode, psram_vaddr_mode_t vaddrmode);
 extern void esp_rom_spi_set_op_mode(int spi_num, esp_rom_spiflash_read_mode_t mode);
 
+static uint8_t s_psram_cs_io = (uint8_t)-1;
+
+uint8_t psram_get_cs_io(void)
+{
+    return s_psram_cs_io;
+}
+
 static void psram_set_op_mode(int spi_num, psram_cmd_mode_t mode)
 {
     if (mode == PSRAM_CMD_QPI) {
@@ -375,6 +382,7 @@ static void IRAM_ATTR psram_gpio_config(psram_cache_mode_t mode)
         psram_io.psram_spiwp_sd3_io = esp_rom_efuse_get_flash_wp_gpio();
     }
     esp_rom_spiflash_select_qio_pins(psram_io.psram_spiwp_sd3_io, spiconfig);
+    s_psram_cs_io = psram_io.psram_cs_io;
 }
 
 psram_size_t psram_get_size(void)

components/esp32s2/spiram_psram.h

@@ -76,5 +76,11 @@ typedef enum {
 
 esp_err_t esp_spiram_wrap_set(spiram_wrap_mode_t mode);
 
+/**
+ * @brief get psram CS IO
+ *
+ * @return psram CS IO
+ */
+uint8_t psram_get_cs_io(void);
 
 #endif