1 // Copyright 2021 The Pigweed Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not 4 // use this file except in compliance with the License. You may obtain a copy of 5 // the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 12 // License for the specific language governing permissions and limitations under 13 // the License. 14 15 #include "pw_boot/boot.h" 16 17 #include <array> 18 19 #include "FreeRTOS.h" 20 #include "pw_assert/check.h" 21 #include "pw_boot_cortex_m/boot.h" 22 #include "pw_malloc/malloc.h" 23 #include "pw_preprocessor/compiler.h" 24 #include "pw_string/util.h" 25 #include "pw_sys_io_stm32cube/init.h" 26 #include "pw_system/init.h" 27 #include "pw_toolchain/infinite_loop.h" 28 #include "stm32f4xx.h" 29 #include "task.h" 30 31 // Initializes clock to its max, 180Mhz. Note that this naming follows CubeMX's 32 // naming out of convention. It's not required that this target provides a 33 // symbol named SystemClock_Config. This function shares the same purpose as 34 // the symbol of the same name that is generated by CubeMX. SystemClock_Config()35extern "C" void SystemClock_Config() { 36 RCC_OscInitTypeDef RCC_OscInitStruct = {}; 37 RCC_ClkInitTypeDef RCC_ClkInitStruct = {}; 38 39 __HAL_RCC_PWR_CLK_ENABLE(); 40 __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1); 41 42 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE; 43 RCC_OscInitStruct.HSEState = RCC_HSE_ON; 44 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; 45 RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; 46 RCC_OscInitStruct.PLL.PLLM = 4; 47 RCC_OscInitStruct.PLL.PLLN = 180; 48 RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; 49 RCC_OscInitStruct.PLL.PLLQ = 8; 50 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { 51 pw_boot_PostMain(); 52 } 53 54 // OverDrive required for operation > 168Mhz 55 if (HAL_PWREx_EnableOverDrive() != HAL_OK) { 56 pw_boot_PostMain(); 57 } 58 59 RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK | 60 RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2; 61 RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; 62 RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; 63 RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4; 64 RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; 65 66 if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK) { 67 pw_boot_PostMain(); 68 } 69 } 70 71 // Functions needed when configGENERATE_RUN_TIME_STATS is on. configureTimerForRunTimeStats(void)72extern "C" void configureTimerForRunTimeStats(void) {} getRunTimeCounterValue(void)73extern "C" unsigned long getRunTimeCounterValue(void) { return uwTick; } 74 pw_boot_PreStaticMemoryInit()75extern "C" void pw_boot_PreStaticMemoryInit() {} 76 pw_boot_PreStaticConstructorInit()77extern "C" void pw_boot_PreStaticConstructorInit() { 78 // Provided by STMicroelectronics SDK. Can be configured to be provided 79 // elsewhere by changing pw_third_party_stm32cube_CMSIS_INIT. 80 SystemInit(); 81 82 // Provided by the STMicroelectronics SDK. 83 HAL_Init(); 84 85 // Typically provided by CubeMX codegen, SystemClock_Config() is instead 86 // provided as part of this target. 87 SystemClock_Config(); 88 89 #if PW_MALLOC_ACTIVE 90 pw_MallocInit(&pw_boot_heap_low_addr, &pw_boot_heap_high_addr); 91 #endif // PW_MALLOC_ACTIVE 92 pw_sys_io_Init(); 93 } 94 95 // TODO(amontanez): pw_boot_PreMainInit() should get renamed to 96 // pw_boot_FinalizeBoot or similar when main() is removed. pw_boot_PreMainInit()97extern "C" void pw_boot_PreMainInit() { 98 pw::system::Init(); 99 vTaskStartScheduler(); 100 PW_UNREACHABLE; 101 } 102 103 // This `main()` stub prevents another main function from being linked since 104 // this target deliberately doesn't run `main()`. main()105int main() {} 106 pw_boot_PostMain()107extern "C" PW_NO_RETURN void pw_boot_PostMain() { 108 // In case main() returns, just sit here until the device is reset. 109 pw::InfiniteLoop(); 110 } 111