src/main/drivers/system_stm32f30x.c

   1 /*
   2  * This file is part of Cleanflight and Betaflight.
   3  *
   4  * Cleanflight and Betaflight are free software. You can redistribute
   5  * this software and/or modify this software under the terms of the
   6  * GNU General Public License as published by the Free Software
   7  * Foundation, either version 3 of the License, or (at your option)
   8  * any later version.
   9  *
  10  * Cleanflight and Betaflight are distributed in the hope that they
  11  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  12  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  13  * See the GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this software.
  17  *
  18  * If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <stdbool.h>
  22 #include <stdint.h>
  23
  24 #include "platform.h"
  25
  26 #include "drivers/nvic.h"
  27 #include "drivers/system.h"
  28
  29 #define AIRCR_VECTKEY_MASK    ((uint32_t)0x05FA0000)
  30
  31 #define BOOTLOADER_MAGIC 0xDEADBEEF
  32 // 40KB SRAM STM32F30X
  33 #define BOOT_TARGET_REGISTER ((uint32_t *)0x20009FFC)
  34
  35 #define DEFAULT_STACK_POINTER ((uint32_t *)0x1FFFD800)
  36 #define SYSTEM_MEMORY_RESET_VECTOR ((uint32_t *) 0x1FFFD804)
  37
  38 void SetSysClock();
  39
  40 void systemReset(void)
  41 {
  42     // Generate system reset
  43     SCB->AIRCR = AIRCR_VECTKEY_MASK | (uint32_t)0x04;
  44 }
  45
  46 void systemResetToBootloader(bootloaderRequestType_e requestType)
  47 {
  48     UNUSED(requestType);
  49     // 1FFFF000 -> 20000200 -> SP
  50     // 1FFFF004 -> 1FFFF021 -> PC
  51
  52     *BOOT_TARGET_REGISTER = BOOTLOADER_MAGIC;
  53
  54     systemReset();
  55 }
  56
  57
  58 void enableGPIOPowerUsageAndNoiseReductions(void)
  59 {
  60 }
  61
  62 bool isMPUSoftReset(void)
  63 {
  64     if (cachedRccCsrValue & RCC_CSR_SFTRSTF)
  65         return true;
  66     else
  67         return false;
  68 }
  69
  70 static void checkForBootLoaderRequest(void)
  71 {
  72     if (*BOOT_TARGET_REGISTER == BOOTLOADER_MAGIC) {
  73
  74         *BOOT_TARGET_REGISTER = 0x0;
  75
  76         __enable_irq();
  77         __set_MSP(*DEFAULT_STACK_POINTER);
  78
  79         ((void(*)(void))(*SYSTEM_MEMORY_RESET_VECTOR))();
  80
  81         while (1);
  82     }
  83 }
  84
  85 void systemInit(void)
  86 {
  87     checkForBootLoaderRequest();
  88
  89     // Enable FPU
  90     SCB->CPACR = (0x3 << (10 * 2)) | (0x3 << (11 * 2));
  91     SetSysClock();
  92
  93     // Configure NVIC preempt/priority groups
  94     NVIC_PriorityGroupConfig(NVIC_PRIORITY_GROUPING);
  95
  96     // cache RCC->CSR value to use it in isMPUSoftReset() and others
  97     cachedRccCsrValue = RCC->CSR;
  98     RCC_ClearFlag();
  99
 100     enableGPIOPowerUsageAndNoiseReductions();
 101
 102     // Init cycle counter
 103     cycleCounterInit();
 104
 105     // SysTick
 106     SysTick_Config(SystemCoreClock / 1000);
 107 }