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spiram: expose function to initialize SPI RAM cache

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Some frameworks based on ESP-IDF need to be able to decide whether to
initialize SPI RAM after the application has started. This change splits
out part of esp_spiram_init which manipulate cache MMU into a separate
function. Applications can disable cache, call esp_spiram_init_cache,
re-enable cache, and then call esp_spiram_init.
Disabling and re-enabling the cache can be achieved using functions
provided in esp_spi_flash.h.
This commit is contained in:
Ivan Grokhotkov
2017-09-18 23:02:33 +08:00
parent 3a271a4ae7
commit 1da3204a7c
3 changed files with 19 additions and 5 deletions
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13
components/esp32/include/esp_spiram.h
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@@ -27,6 +27,17 @@
*/
esp_err_t esp_spiram_init();
/**
* @brief Configure Cache/MMU for access to external SPI RAM.
*
* Normally this function is called from cpu_start, if CONFIG_SPIRAM_BOOT_INIT
* option is enabled. Applications which need to enable SPI RAM at run time
* can disable CONFIG_SPIRAM_BOOT_INIT, and call this function later.
*
* @attention this function must be called with flash cache disabled.
*/
void esp_spiram_init_cache();
/**
* @brief Memory test for SPI RAM. Should be called after SPI RAM is initialized and
@@ -76,4 +87,4 @@ void esp_spiram_writeback_cache();
esp_err_t esp_spiram_reserve_dma_pool(size_t size);
#endif
#endif