diff options
| author | Damien George <damien.p.george@gmail.com> | 2017-08-24 12:20:26 +1000 |
|---|---|---|
| committer | Damien George <damien.p.george@gmail.com> | 2017-08-24 12:20:26 +1000 |
| commit | a8052d343c133202590b3f6712a9267abee1f5c1 (patch) | |
| tree | 31663f0a6cc5f0808139d9ed608db6319041a939 | |
| parent | 41b4686dd75fde815cf9c12593f223b4305e54f9 (diff) | |
stmhal/modmachine: For F7 MCU, save power by reducing internal volt reg.
| -rw-r--r-- | stmhal/modmachine.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/stmhal/modmachine.c b/stmhal/modmachine.c index df75d393c..81f82e191 100644 --- a/stmhal/modmachine.c +++ b/stmhal/modmachine.c @@ -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 |