diff --git a/litex/soc/software/liblitesdcard/spisdcard.c b/litex/soc/software/liblitesdcard/spisdcard.c index 993380a97..3ffe8933e 100644 --- a/litex/soc/software/liblitesdcard/spisdcard.c +++ b/litex/soc/software/liblitesdcard/spisdcard.c @@ -18,13 +18,13 @@ #ifdef CSR_SPISDCARD_BASE -#define SPISDCARD_DEBUG +//#define SPISDCARD_DEBUG #ifndef SPISDCARD_CLK_FREQ_INIT -#define SPISDCARD_CLK_FREQ_INIT 400000 +#define SPISDCARD_CLK_FREQ_INIT 200000 #endif #ifndef SPISDCARD_CLK_FREQ -#define SPISDCARD_CLK_FREQ 10000000 +#define SPISDCARD_CLK_FREQ 25000000 #endif /*-----------------------------------------------------------------------*/ @@ -63,14 +63,14 @@ static uint8_t spi_xfer(uint8_t byte) { /* SDCard Select/Deselect functions */ /*-----------------------------------------------------------------------*/ -static void spisdcarddeselect(void) { +static void spisdcard_deselect(void) { /* Set SPI CS High */ spisdcard_cs_write(SPI_CS_HIGH); /* Generate 8 dummy clocks */ spi_xfer(0xff); } -static int spisdcardselect(void) { +static int spisdcard_select(void) { uint16_t timeout; /* Set SPI CS Low */ @@ -89,7 +89,7 @@ static int spisdcardselect(void) { } /* Deselect card on error */ - spisdcarddeselect(); + spisdcard_deselect(); return 0; } @@ -158,8 +158,8 @@ static uint8_t spisdcardsend_cmd(uint8_t cmd, uint32_t arg) /* Select the card and wait for it, except for CMD12: STOP_TRANSMISSION */ if (cmd != CMD12) { - spisdcarddeselect(); - if (spisdcardselect() == 0) + spisdcard_deselect(); + if (spisdcard_select() == 0) return 0xff; } @@ -203,15 +203,21 @@ uint8_t spisdcard_init(void) { /* Set SPI clk freq to initialization frequency */ spi_set_clk_freq(SPISDCARD_CLK_FREQ_INIT); - /* Wait 10ms */ - busy_wait(10); + timeout = 1000; + while (timeout) { + /* Set SDCard in SPI Mode (generate 80 dummy clocks) */ + spisdcard_cs_write(SPI_CS_HIGH); + for (i=0; i<10; i++) + spi_xfer(0xff); + spisdcard_cs_write(SPI_CS_LOW); - /* Set SDCard in SPI Mode (generate 80 dummy clocks) */ - for (i=0; i<10; i++) - spi_xfer(0xff); + /* Set SDCard in Idle state */ + if (spisdcardsend_cmd(CMD0, 0) == 0x1) + break; - /* Set SDCard in Idle state */ - if (spisdcardsend_cmd(CMD0, 0) != 0x1) + timeout--; + } + if (timeout == 0) return 0; /* Set SDCard voltages, only supported by ver2.00+ SDCards */ @@ -253,7 +259,7 @@ DSTATUS disk_initialize(uint8_t drv) { if (drv) return RES_NOTRDY; r = spisdcard_init(); - spisdcarddeselect(); + spisdcard_deselect(); spisdcardstatus = r ? 0 : STA_NOINIT; return spisdcardstatus; @@ -275,7 +281,7 @@ DRESULT disk_read(uint8_t drv, uint8_t *buf, uint32_t sector, uint32_t count) { if (cmd == CMD18) spisdcardsend_cmd(CMD12, 0); /* STOP_TRANSMISSION */ } - spisdcarddeselect(); + spisdcard_deselect(); if (count) return RES_ERROR;