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Change the FMC frequency source to HCLK #995

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Change the FMC frequency source to HCLK #995

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1f15f3c
Change the FMC frequency source to HCLK
Bexin3 Nov 10, 2024
1605162
Removed unnecessary PLL2 clock setting as PLL2 is no longer being used
Bexin3 Nov 10, 2024
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24 changes: 1 addition & 23 deletions libraries/Portenta_SDRAM/src/ram_internal.c
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Original file line number Diff line number Diff line change
Expand Up @@ -38,29 +38,7 @@ static HAL_StatusTypeDef FMC_SDRAM_Clock_Config(void)
RCC_PeriphCLKInitTypeDef RCC_PeriphCLKInitStruct;

RCC_PeriphCLKInitStruct.PeriphClockSelection = RCC_PERIPHCLK_FMC;
RCC_PeriphCLKInitStruct.FmcClockSelection = RCC_FMCCLKSOURCE_PLL2;
#ifdef ARDUINO_GIGA
/* 16MHz HSE */
/* PLL2_VCO Input = HSE_VALUE/PLL2_M = (16/4) = 4 Mhz */
/* PLL2_VCO Output = PLL2_VCO Input * PLL_N = 4*100 = 400 Mhz */
/* FMC Kernel Clock = PLL2_VCO Output/PLL_R = 400/2 = 200 Mhz */
RCC_PeriphCLKInitStruct.PLL2.PLL2RGE = RCC_PLL2VCIRANGE_2;
RCC_PeriphCLKInitStruct.PLL2.PLL2M = 4;
RCC_PeriphCLKInitStruct.PLL2.PLL2N = 100;
#else
/* 25MHz HSE */
/* PLL2_VCO Input = HSE_VALUE/PLL2_M = 25/5 = 5 Mhz */
/* PLL2_VCO Output = PLL2_VCO Input * PLL_N = 5*80 = 400 Mhz */
/* FMC Kernel Clock = PLL2_VCO Output/PLL_R = 400/2 = 200 Mhz */
RCC_PeriphCLKInitStruct.PLL2.PLL2RGE = RCC_PLL2VCIRANGE_2;
RCC_PeriphCLKInitStruct.PLL2.PLL2M = 5;
RCC_PeriphCLKInitStruct.PLL2.PLL2N = 80;
#endif
RCC_PeriphCLKInitStruct.PLL2.PLL2FRACN = 0;
RCC_PeriphCLKInitStruct.PLL2.PLL2P = 2;
RCC_PeriphCLKInitStruct.PLL2.PLL2Q = 2;
RCC_PeriphCLKInitStruct.PLL2.PLL2R = 2;
RCC_PeriphCLKInitStruct.PLL2.PLL2VCOSEL = RCC_PLL2VCOWIDE;
RCC_PeriphCLKInitStruct.FmcClockSelection = RCC_FMCCLKSOURCE_HCLK;
return HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphCLKInitStruct);
}

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6 changes: 6 additions & 0 deletions libraries/Portenta_SDRAM/src/ram_internal.h
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Expand Up @@ -14,7 +14,13 @@ bool sdram_init(void);
#define MICROPY_HW_SDRAM_TIMING_TRP (3)
#define MICROPY_HW_SDRAM_TIMING_TRCD (3)
#define MICROPY_HW_SDRAM_REFRESH_RATE (64) // ms

#ifdef ARDUINO_GIGA
#define MICROPY_HW_SDRAM_FREQUENCY (120000) // 100 MHz
#else
#define MICROPY_HW_SDRAM_FREQUENCY (100000) // 100 MHz
#endif

#define MICROPY_HW_SDRAM_REFRESH_CYCLES 4096

#define MICROPY_HW_SDRAM_BURST_LENGTH 1
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