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added spi hal functions

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This commit is contained in:
Robin Müller
2021-06-03 14:03:38 +02:00
parent 22384aec6a
commit dc6327b909
3 changed files with 35 additions and 1 deletions
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26
stm32h7/spi/spiDefinitions.cpp
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@ -24,3 +24,29 @@ void spi::assignSpiMode(SpiModes spiMode, SPI_HandleTypeDef *spiHandle) {
}
}
}
uint32_t spi::getPrescaler(uint32_t clock_src_freq, uint32_t baudrate_mbps) {
uint32_t divisor = 0;
uint32_t spi_clk = clock_src_freq;
uint32_t presc = 0;
static const uint32_t baudrate[] = {
SPI_BAUDRATEPRESCALER_2,
SPI_BAUDRATEPRESCALER_4,
SPI_BAUDRATEPRESCALER_8,
SPI_BAUDRATEPRESCALER_16,
SPI_BAUDRATEPRESCALER_32,
SPI_BAUDRATEPRESCALER_64,
SPI_BAUDRATEPRESCALER_128,
SPI_BAUDRATEPRESCALER_256,
};
while( spi_clk > baudrate_mbps) {
presc = baudrate[divisor];
if (++divisor > 7)
break;
spi_clk = ( spi_clk >> 1);
}
return presc;
}