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stm32: added peripheral clock get helpers for all stm32 platforms.

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Allows for abstraction for code that's dependent on knowing the source clock
for a peripheral. Implemented a few core peripherals that tend to have clock
tree differences between platforms (USART, timers, I2C, SPI).
This commit is contained in:
Brian Viele
2020-03-06 00:57:21 -05:00
committed by Karl Palsson
parent df55d45cc1
commit e41ac6ea71
24 changed files with 860 additions and 94 deletions
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12
lib/stm32/common/rcc_common_all.c
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@@ -270,6 +270,18 @@ void rcc_osc_bypass_disable(enum rcc_osc osc)
}
}
/* This is a helper to calculate dividers that go 2/4/8/16/64/128/256/512.
* These dividers also use the top bit as an "enable". This is tyipcally
* used for AHB and other system clock prescaler. */
uint16_t rcc_get_div_from_hpre(uint8_t div_val) {
if (div_val < 0x8) {
return 1;
} else if (div_val <= 0x0b /* DIV16 */) {
return (1U << (div_val - 7));
} else {
return (1U << (div_val - 6));
}
}
/**@}*/
#undef _RCC_REG