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Run SPI FLASH at full speed

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This commit is contained in:
Steve Evans 2020-08-25 08:34:15 +01:00
parent 60c008b20b
commit 41a0ca43d1
39 changed files with 276 additions and 193 deletions
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19
src/main/drivers/bus_spi.c
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@ -240,6 +240,25 @@ void spiBusSetInstance(busDevice_t *bus, SPI_TypeDef *instance)
bus->busdev_u.spi.instance = instance;
}
uint16_t spiCalculateDivider(uint32_t freq)
{
#if defined(STM32F4) || defined(STM32G4) || defined(STM32F7)
uint32_t spiClk = SystemCoreClock / 2;
#elif defined(STM32H7)
uint32_t spiClk = 100000000;
#else
#error "Base SPI clock not defined for this architecture"
#endif
uint16_t divisor = 2;
spiClk >>= 1;
for (; (spiClk > freq) && (divisor < 256); divisor <<= 1, spiClk >>= 1);
return divisor;
}
void spiBusSetDivisor(busDevice_t *bus, uint16_t divisor)
{
spiSetDivisor(bus->busdev_u.spi.instance, divisor);