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Add first version of spi_enable()/spi_disable().

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This commit is contained in:
Uwe Hermann 2009-12-30 23:28:40 +01:00
parent a7a3770d51
commit 98997691d3
2 changed files with 23 additions and 0 deletions
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2
include/libopenstm32/spi.h
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@ -150,6 +150,8 @@
/* --- Function prototypes ------------------------------------------------- */
int spi_init_master(u32 spi, u32 br, u32 cpol, u32 cpha, u32 dff, u32 lsbfirst);
void spi_enable(u32 spi);
void spi_disable(u32 spi);
void spi_write(u32 spi, u16 data);
u16 spi_read(u32 spi);

21
lib/spi.c
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@ -51,6 +51,27 @@ int spi_init_master(u32 spi, u32 br, u32 cpol, u32 cpha, u32 dff, u32 lsbfirst)
return 0; /* TODO */
}
/* TODO: Error handling? */
void spi_enable(u32 spi)
{
u32 reg32;
reg32 = SPI_CR1(spi);
reg32 |= SPI_CR1_SPE; /* Enable SPI. */
SPI_CR1(spi) = reg32;
}
/* TODO: Error handling? */
void spi_disable(u32 spi)
{
u32 reg32;
/* TODO: Follow procedure from section 23.3.8 in the techref manual. */
reg32 = SPI_CR1(spi);
reg32 &= ~(SPI_CR1_SPE); /* Disable SPI. */
SPI_CR1(spi) = reg32;
}
void spi_write(u32 spi, u16 data)
{
/* Write data (8 or 16 bits, depending on DFF) into DR. */