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esp32: psram_set_cs_timing: sync with esp-idf

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I have no idea what this setting is.
I'm just blindly trying to follow whatever esp-idf does.

the esp-idf counterpart:
6e5414b6c4/components/esp_psram/esp32/esp_psram_impl_quad.c (L702-L712)
6e5414b6c4/components/esp_psram/esp32/esp_psram_impl_quad.c (L136-L147)
This commit is contained in:
YAMAMOTO Takashi 2024-08-30 15:39:05 +09:00 committed by Alan C. Assis
parent b15c1a441a
commit 471d411503
1 changed files with 12 additions and 2 deletions
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14
arch/xtensa/src/esp32/esp32_psram.c
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@ -190,6 +190,16 @@
# define PSRAM_SPICLKEN DPORT_SPI01_CLK_EN
#endif
/* Let's to assume SPIFLASH SPEED == SPIRAM SPEED for now */
#if defined(CONFIG_ESP32_SPIRAM_SPEED_40M)
# define PSRAM_CS_HOLD_TIME 0
#elif defined(CONFIG_ESP32_SPIRAM_SPEED_80M)
# define PSRAM_CS_HOLD_TIME 1
#else
# error "FLASH speed can only be equal to or higher than SRAM speed while SRAM is enabled!"
#endif
/****************************************************************************
* Private Types
****************************************************************************/
@ -1260,8 +1270,8 @@ void psram_set_cs_timing(psram_spi_num_t spi_num, psram_clk_mode_t clk_mode)
/* Set cs time. */
SET_PERI_REG_BITS(SPI_CTRL2_REG(spi_num), SPI_HOLD_TIME_V, 1,
SPI_HOLD_TIME_S);
SET_PERI_REG_BITS(SPI_CTRL2_REG(spi_num), SPI_HOLD_TIME_V,
PSRAM_CS_HOLD_TIME, SPI_HOLD_TIME_S);
SET_PERI_REG_BITS(SPI_CTRL2_REG(spi_num), SPI_SETUP_TIME_V, 0,
SPI_SETUP_TIME_S);
}