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soc/rtc: add function to convert CPU frequency in MHz to rtc_cpu_freq_t

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This commit is contained in:
Ivan Grokhotkov 2017-10-14 00:27:56 +08:00
parent a242ae6d0b
commit b03e08dc4e
2 changed files with 26 additions and 0 deletions
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8
components/soc/esp32/include/soc/rtc.h
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@ -315,6 +315,14 @@ rtc_cpu_freq_t rtc_clk_cpu_freq_get();
*/
uint32_t rtc_clk_cpu_freq_value(rtc_cpu_freq_t cpu_freq);
/**
* @brief Get rtc_cpu_freq_t enum value for given CPU frequency
* @param cpu_freq_mhz CPU frequency, one of 80, 160, 240, 2, and XTAL frequency
* @param[out] out_val output, rtc_cpu_freq_t value corresponding to the frequency
* @return true if the given frequency value matches one of enum values
*/
bool rtc_clk_cpu_freq_from_mhz(int cpu_freq_mhz, rtc_cpu_freq_t* out_val);
/**
* @brief Store new APB frequency value into RTC_APB_FREQ_REG
*

18
components/soc/esp32/rtc_clk.c
View file

@ -504,6 +504,24 @@ uint32_t rtc_clk_cpu_freq_value(rtc_cpu_freq_t cpu_freq)
}
}
bool rtc_clk_cpu_freq_from_mhz(int mhz, rtc_cpu_freq_t* out_val)
{
if (mhz == 240) {
*out_val = RTC_CPU_FREQ_240M;
} else if (mhz == 160) {
*out_val = RTC_CPU_FREQ_160M;
} else if (mhz == 80) {
*out_val = RTC_CPU_FREQ_80M;
} else if (mhz == (int) rtc_clk_xtal_freq_get()) {
*out_val = RTC_CPU_FREQ_XTAL;
} else if (mhz == 2) {
*out_val = RTC_CPU_FREQ_2M;
} else {
return false;
}
return true;
}
/* Values of RTC_XTAL_FREQ_REG and RTC_APB_FREQ_REG are stored as two copies in
* lower and upper 16-bit halves. These are the routines to work with such a
* representation.