1 | /* |
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2 | * Copyright (c) 2012 Sebastian Huber. All rights reserved. |
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3 | * |
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4 | * embedded brains GmbH |
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5 | * Obere Lagerstr. 30 |
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6 | * 82178 Puchheim |
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7 | * Germany |
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8 | * <rtems@embedded-brains.de> |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.rtems.org/license/LICENSE. |
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13 | */ |
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14 | |
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15 | #include <bsp/rcc.h> |
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16 | #include <bsp/stm32f4.h> |
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17 | |
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18 | #include <rtems.h> |
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19 | |
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20 | static void rcc_set( |
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21 | stm32f4_rcc_index index, |
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22 | bool set, |
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23 | volatile uint32_t *regs |
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24 | ) |
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25 | { |
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26 | int reg = index >> 5; |
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27 | uint32_t one = 1; |
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28 | uint32_t bit = one << (index & 0x1f); |
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29 | rtems_interrupt_level level; |
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30 | uint32_t val; |
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31 | |
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32 | rtems_interrupt_disable(level); |
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33 | val = regs [reg]; |
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34 | if (set) { |
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35 | val |= bit; |
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36 | } else { |
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37 | val &= ~bit; |
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38 | } |
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39 | regs [reg] = val; |
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40 | rtems_interrupt_enable(level); |
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41 | } |
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42 | |
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43 | void stm32f4_rcc_reset(stm32f4_rcc_index index) |
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44 | { |
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45 | stm32f4_rcc_set_reset(index, true); |
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46 | stm32f4_rcc_set_reset(index, false); |
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47 | } |
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48 | |
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49 | void stm32f4_rcc_set_reset(stm32f4_rcc_index index, bool set) |
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50 | { |
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51 | volatile stm32f4_rcc *rcc = STM32F4_RCC; |
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52 | |
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53 | #ifdef STM32F4_FAMILY_F4XXXX |
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54 | rcc_set(index, set, &rcc->ahbrstr [0]); |
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55 | #endif/* STM32F4_FAMILY_F4XXXX */ |
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56 | #ifdef STM32F4_FAMILY_F10XXX |
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57 | /* The first register is missing for the reset-block */ |
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58 | rcc_set(index, set, &rcc->cir); |
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59 | #endif /* STM32F4_FAMILY_F10XXX */ |
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60 | } |
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61 | |
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62 | void stm32f4_rcc_set_clock(stm32f4_rcc_index index, bool set) |
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63 | { |
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64 | volatile stm32f4_rcc *rcc = STM32F4_RCC; |
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65 | |
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66 | rcc_set(index, set, &rcc->ahbenr [0]); |
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67 | } |
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68 | |
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69 | #ifdef STM32F4_FAMILY_F4XXXX |
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70 | void stm32f4_rcc_set_low_power_clock(stm32f4_rcc_index index, bool set) |
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71 | { |
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72 | volatile stm32f4_rcc *rcc = STM32F4_RCC; |
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73 | |
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74 | rcc_set(index, set, &rcc->ahblpenr [0]); |
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75 | } |
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76 | #endif /* STM32F4_FAMILY_F4XXXX */ |
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