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FIX: fix vcu118 sd card frequency #1685

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merged 5 commits into from
Dec 21, 2023
Merged

FIX: fix vcu118 sd card frequency #1685

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e787567
FIX: fix vcu118 sd card frequency
T-K-233 Dec 5, 2023
069a9d2
ADD: add equation for setting certain SPI clock speed
T-K-233 Dec 5, 2023
516ecf9
ADD: increase frequency to maximum
T-K-233 Dec 21, 2023
c32de04
ADD: add inline docs
T-K-233 Dec 21, 2023
2be3d3d
Merge branch 'main' into fix-vcu118
T-K-233 Dec 21, 2023
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10 changes: 7 additions & 3 deletions fpga/src/main/resources/vcu118/sdboot/sd.c
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,7 @@
#error Must define TL_CLK
#endif

#define F_CLK TL_CLK
#define F_CLK (TL_CLK)

static volatile uint32_t * const spi = (void *)(SPI_CTRL_ADDR);

Expand Down Expand Up @@ -79,7 +79,9 @@ static inline void sd_cmd_end(void)
static void sd_poweron(void)
{
long i;
REG32(spi, SPI_REG_SCKDIV) = (F_CLK / 300000UL);
// HACK: frequency change
// REG32(spi, SPI_REG_SCKDIV) = (F_CLK / 300000UL);
REG32(spi, SPI_REG_SCKDIV) = (F_CLK * 2.5);
REG32(spi, SPI_REG_CSMODE) = SPI_CSMODE_OFF;
for (i = 10; i > 0; i--) {
sd_dummy();
Expand Down Expand Up @@ -176,7 +178,9 @@ static int copy(void)

// TODO: Speed up SPI freq. (breaks between these two values)
//REG32(spi, SPI_REG_SCKDIV) = (F_CLK / 16666666UL);
REG32(spi, SPI_REG_SCKDIV) = (F_CLK / 5000000UL);
// HACK: frequency change
// REG32(spi, SPI_REG_SCKDIV) = (F_CLK / 5000000UL);
REG32(spi, SPI_REG_SCKDIV) = (F_CLK * 2); // / 0.5
if (sd_cmd(0x52, BBL_PARTITION_START_SECTOR, 0xE1) != 0x00) {
sd_cmd_end();
return 1;
Expand Down