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stmhal/modmachine: For F7 MCU, save power by reducing internal volt reg.

This commit is contained in:
Damien George 2017-08-24 12:20:26 +10:00
parent 41b4686dd7
commit a8052d343c
1 changed files with 15 additions and 0 deletions
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15
stmhal/modmachine.c
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@ -363,6 +363,21 @@ STATIC mp_obj_t machine_freq(mp_uint_t n_args, const mp_obj_t *args) {
// set PLL as system clock source if wanted
if (sysclk_source == RCC_SYSCLKSOURCE_PLLCLK) {
#if defined(MCU_SERIES_F7)
// if possible, scale down the internal voltage regulator to save power
uint32_t volt_scale;
if (wanted_sysclk <= 151000000) {
volt_scale = PWR_REGULATOR_VOLTAGE_SCALE3;
} else if (wanted_sysclk <= 180000000) {
volt_scale = PWR_REGULATOR_VOLTAGE_SCALE2;
} else {
volt_scale = PWR_REGULATOR_VOLTAGE_SCALE1;
}
if (HAL_PWREx_ControlVoltageScaling(volt_scale) != HAL_OK) {
goto fail;
}
#endif
#if !defined(MICROPY_HW_FLASH_LATENCY)
#define MICROPY_HW_FLASH_LATENCY FLASH_LATENCY_5
#endif