djsundog
/
circuitpython
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

stm32/modmachine: In freq(), select flash latency value based on freq.

This commit is contained in:
Damien George 2018-02-01 14:06:18 +11:00
parent e8a8fa77ca
commit 9e7d2c7abb
1 changed files with 19 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
ports/stm32/modmachine.c
View File

@ -359,27 +359,44 @@ STATIC mp_obj_t machine_freq(size_t n_args, const mp_obj_t *args) {
// set PLL as system clock source if wanted
if (sysclk_source == RCC_SYSCLKSOURCE_PLLCLK) {
uint32_t flash_latency;
#if defined(MCU_SERIES_F7)
// if possible, scale down the internal voltage regulator to save power
// the flash_latency values assume a supply voltage between 2.7V and 3.6V
uint32_t volt_scale;
if (wanted_sysclk <= 151000000) {
if (wanted_sysclk <= 90000000) {
volt_scale = PWR_REGULATOR_VOLTAGE_SCALE3;
flash_latency = FLASH_LATENCY_2;
} else if (wanted_sysclk <= 120000000) {
volt_scale = PWR_REGULATOR_VOLTAGE_SCALE3;
flash_latency = FLASH_LATENCY_3;
} else if (wanted_sysclk <= 144000000) {
volt_scale = PWR_REGULATOR_VOLTAGE_SCALE3;
flash_latency = FLASH_LATENCY_4;
} else if (wanted_sysclk <= 180000000) {
volt_scale = PWR_REGULATOR_VOLTAGE_SCALE2;
flash_latency = FLASH_LATENCY_5;
} else if (wanted_sysclk <= 210000000) {
volt_scale = PWR_REGULATOR_VOLTAGE_SCALE1;
flash_latency = FLASH_LATENCY_6;
} else {
volt_scale = PWR_REGULATOR_VOLTAGE_SCALE1;
flash_latency = FLASH_LATENCY_7;
}
if (HAL_PWREx_ControlVoltageScaling(volt_scale) != HAL_OK) {
goto fail;
}
#endif
#if !defined(MCU_SERIES_F7)
#if !defined(MICROPY_HW_FLASH_LATENCY)
#define MICROPY_HW_FLASH_LATENCY FLASH_LATENCY_5
#endif
flash_latency = MICROPY_HW_FLASH_LATENCY;
#endif
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, MICROPY_HW_FLASH_LATENCY) != HAL_OK) {
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, flash_latency) != HAL_OK) {
goto fail;
}
}