add flash and PSRAM CS IO acquire function

components/esp32/include/esp32/spiram.h

@@ -89,6 +89,15 @@ 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/esp32/spiram.c

@@ -296,4 +296,8 @@ bool esp_spiram_is_initialized(void)
     return spiram_inited;
 }
 
+uint8_t esp_spiram_get_cs_io(void)
+{
+    return psram_get_cs_io();
+}
 #endif

components/esp32/spiram_psram.c

@@ -203,6 +203,13 @@ typedef struct {
 
 static void IRAM_ATTR psram_cache_init(psram_cache_mode_t psram_cache_mode, psram_vaddr_mode_t vaddrmode);
 
+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_clear_spi_fifo(psram_spi_num_t spi_num)
 {
     int i;
@@ -844,6 +851,7 @@ esp_err_t IRAM_ATTR psram_enable(psram_cache_mode_t mode, psram_vaddr_mode_t vad
         ESP_EARLY_LOGE(TAG, "Not a valid or known package id: %d", pkg_ver);
         abort();
     }
+    s_psram_cs_io = psram_io.psram_cs_io;
 
     const uint32_t spiconfig = esp_rom_efuse_get_flash_gpio_info();
     if (spiconfig == ESP_ROM_EFUSE_FLASH_DEFAULT_SPI) {

components/esp32/spiram_psram.h

@@ -67,4 +67,11 @@ psram_size_t psram_get_size(void);
  */
 esp_err_t psram_enable(psram_cache_mode_t mode, psram_vaddr_mode_t vaddrmode);
 
+/**
+ * @brief get psram CS IO
+ *
+ * @return psram CS IO
+ */
+uint8_t psram_get_cs_io(void);
+
 #endif