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dhylandsdpgeorge
dhylands
authored and
dpgeorge
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stmhal: Set STM32F7DISC CPU Frequency to 216 MHz
This set the CPU frequency to 216 MHz (the max) and leaves the USB Frequency at 48 MHz. These settings were copied from one of the HAL examples.
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Lines changed: 10 additions & 3 deletions

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‎stmhal/boards/STM32F7DISC/mpconfigboard.h‎

Lines changed: 10 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -20,12 +20,19 @@
2020
void STM32F7DISC_board_early_init(void);
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// HSE is 25MHz
23+
// VCOClock = HSE * PLLN / PLLM = 25 MHz * 432 / 25 = 432 MHz
24+
// SYSCLK = VCOClock / PLLP = 432 MHz / 2 = 216 MHz
25+
// USB/SDMMC/RNG Clock = VCOClock / PLLQ = 432 MHz / 9 = 48 MHz
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#define MICROPY_HW_CLK_PLLM (25)
24-
#define MICROPY_HW_CLK_PLLN (336)
27+
#define MICROPY_HW_CLK_PLLN (432)
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#define MICROPY_HW_CLK_PLLP (RCC_PLLP_DIV2)
26-
#define MICROPY_HW_CLK_PLLQ (7)
29+
#define MICROPY_HW_CLK_PLLQ (9)
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28-
#define MICROPY_HW_FLASH_LATENCY FLASH_LATENCY_6
31+
// From the reference manual, for 2.7V to 3.6V
32+
// 151-180 MHz => 5 wait states
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// 181-210 MHz => 6 wait states
34+
// 211-216 MHz => 7 wait states
35+
#define MICROPY_HW_FLASH_LATENCY FLASH_LATENCY_7 // 210-216 MHz needs 7 wait states
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// UART config
3138
#define MICROPY_HW_UART1_TX_PORT (GPIOA)

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