Update SDRAM refresh rate calculation

BornaBiro · web-flow · commit 49501956486f · 2025-12-11T14:09:52.000+01:00
diff --git a/src/stm32System/stm32FMC.cpp b/src/stm32System/stm32FMC.cpp
@@ -153,7 +153,7 @@ static void MX_FMC_Init(void)
     /* Step 8: Set the refresh rate counter - refer to section SDRAM refresh timer register in RM0455 */
     /* Set the device refresh rate
     * COUNT = [(SDRAM self refresh time / number of row) x  SDRAM CLK] – 20
-            = [(64ms/8192) * 143.3333MHz] - 20 = 1099. */
+            = [(64ms/8192) * 150MHz] - 20 = 1151.875 ~ 1152. */
     if (HAL_SDRAM_ProgramRefreshRate(&_hsdram1, 1152) != HAL_OK)
     {
         Error_Handler();
@@ -680,4 +680,4 @@ extern "C" void MDMA_IRQHandler()
 {
     HAL_MDMA_IRQHandler(&_hmdmaMdmaChannel40Sw0);
     HAL_MDMA_IRQHandler(&_hmdmaMdmaChannel41Sw0);
-}
+}

Original file line number	Diff line number	Diff line change
`@@ -153,7 +153,7 @@ static void MX_FMC_Init(void)`
`153`	`153`	`/* Step 8: Set the refresh rate counter - refer to section SDRAM refresh timer register in RM0455 */`
`154`	`154`	`/* Set the device refresh rate`
`155`	`155`	`* COUNT = [(SDRAM self refresh time / number of row) x SDRAM CLK] – 20`
`156`		`- = [(64ms/8192) * 143.3333MHz] - 20 = 1099. */`
	`156`	`+ = [(64ms/8192) * 150MHz] - 20 = 1151.875 ~ 1152. */`
`157`	`157`	`if (HAL_SDRAM_ProgramRefreshRate(&_hsdram1, 1152) != HAL_OK)`
`158`	`158`	`{`
`159`	`159`	`Error_Handler();`
`@@ -680,4 +680,4 @@ extern "C" void MDMA_IRQHandler()`
`680`	`680`	`{`
`681`	`681`	`HAL_MDMA_IRQHandler(&_hmdmaMdmaChannel40Sw0);`
`682`	`682`	`HAL_MDMA_IRQHandler(&_hmdmaMdmaChannel41Sw0);`
`683`		`-}`
	`683`	`+}`