1 files changed, 118 insertions, 0 deletions
diff --git a/ports/stm/peripherals/stm32f7/clocks.c b/ports/stm/peripherals/stm32f7/clocks.c
new file mode 100644
index 000000000..93016f682
--- /dev/null
+++ b/ports/stm/peripherals/stm32f7/clocks.c
@@ -0,0 +1,118 @@
+ /*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Lucian Copeland for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "stm32f7xx_hal.h"
+#include "supervisor/shared/safe_mode.h"
+#include <stdbool.h>
+
+// F7 Series
+#ifdef STM32F746xx
+#include "stm32f7/stm32f746xx/clocks.h"
+#endif
+#ifdef STM32F767xx
+#include "stm32f7/stm32f767xx/clocks.h"
+#endif
+
+void stm32_peripherals_clocks_init(void) {
+    RCC_ClkInitTypeDef RCC_ClkInitStruct;
+    RCC_OscInitTypeDef RCC_OscInitStruct;
+    RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
+    bool lse_failure = false;
+
+    // Configure LSE Drive
+    HAL_PWR_EnableBkUpAccess();
+    __HAL_RCC_LSEDRIVE_CONFIG(RCC_LSEDRIVE_LOW);
+
+    // Set voltage scaling in accordance with system clock speed
+    __HAL_RCC_PWR_CLK_ENABLE();
+    __HAL_PWR_VOLTAGESCALING_CONFIG(CPY_CLK_VSCALE);
+
+    // Set up primary PLL and HSE clocks
+    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+    #if (BOARD_HAS_LOW_SPEED_CRYSTAL)
+    RCC_OscInitStruct.OscillatorType |= RCC_OSCILLATORTYPE_LSE;
+    RCC_OscInitStruct.LSEState = RCC_LSE_ON;
+    #else
+    RCC_OscInitStruct.OscillatorType |= RCC_OSCILLATORTYPE_LSI;
+    RCC_OscInitStruct.LSIState = RCC_LSI_ON;
+    #endif
+    RCC_OscInitStruct.HSEState = BOARD_HSE_SOURCE;
+    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+    RCC_OscInitStruct.PLL.PLLM = HSE_VALUE/1000000;
+    RCC_OscInitStruct.PLL.PLLN = CPY_CLK_PLLN;
+    RCC_OscInitStruct.PLL.PLLP = CPY_CLK_PLLP;
+    RCC_OscInitStruct.PLL.PLLQ = CPY_CLK_PLLQ;
+
+    if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
+        // Failure likely means a LSE issue - attempt to swap to LSI, and set to crash
+        RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
+        RCC_OscInitStruct.OscillatorType |= RCC_OSCILLATORTYPE_LSI;
+        RCC_OscInitStruct.LSIState = RCC_LSI_ON;
+        if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
+            // No HSE means no USB, so just fail forever
+            while(1);
+        }
+        lse_failure = true;
+    }
+
+    /* Activate the OverDrive to reach the 216 MHz Frequency */
+    HAL_PWREx_EnableOverDrive();
+
+    // Configure bus clock sources and divisors
+    RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+    RCC_ClkInitStruct.AHBCLKDivider = CPY_CLK_AHBDIV;
+    RCC_ClkInitStruct.APB1CLKDivider = CPY_CLK_APB1DIV;
+    RCC_ClkInitStruct.APB2CLKDivider = CPY_CLK_APB2DIV;
+    HAL_RCC_ClockConfig(&RCC_ClkInitStruct, CPY_CLK_FLASH_LATENCY);
+
+    // Set up non-bus peripherals
+    // TODO: I2S settings go here
+    PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
+    #if (BOARD_HAS_LOW_SPEED_CRYSTAL)
+    PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSE;
+    #else
+    PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSI;
+    #endif
+    #if (CPY_CLK_USB_USES_AUDIOPLL)
+    // Should always result in 48M.
+    PeriphClkInitStruct.PLLSAI.PLLSAIN = 192;
+    PeriphClkInitStruct.PLLSAI.PLLSAIR = 2;
+    PeriphClkInitStruct.PLLSAI.PLLSAIQ = 2;
+    PeriphClkInitStruct.PLLSAI.PLLSAIP = RCC_PLLSAIP_DIV4;
+    PeriphClkInitStruct.PLLSAIDivQ = 1;
+    PeriphClkInitStruct.PLLSAIDivR = RCC_PLLSAIDIVR_2;
+    PeriphClkInitStruct.PeriphClockSelection |= RCC_PERIPHCLK_CK48;
+    PeriphClkInitStruct.Clk48ClockSelection = RCC_CLK48SOURCE_PLLSAIP;
+    #endif
+
+    HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
+
+    if (lse_failure) {
+        reset_into_safe_mode(HARD_CRASH); //TODO: make safe mode category CLOCK_FAULT?
+    }
+}