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| 1 | +------------------------------------------------------------------------------ |
| 2 | +-- -- |
| 3 | +-- Copyright (C) 2022, AdaCore -- |
| 4 | +-- -- |
| 5 | +-- Redistribution and use in source and binary forms, with or without -- |
| 6 | +-- modification, are permitted provided that the following conditions are -- |
| 7 | +-- met: -- |
| 8 | +-- 1. Redistributions of source code must retain the above copyright -- |
| 9 | +-- notice, this list of conditions and the following disclaimer. -- |
| 10 | +-- 2. Redistributions in binary form must reproduce the above copyright -- |
| 11 | +-- notice, this list of conditions and the following disclaimer in -- |
| 12 | +-- the documentation and/or other materials provided with the -- |
| 13 | +-- distribution. -- |
| 14 | +-- 3. Neither the name of the copyright holder nor the names of its -- |
| 15 | +-- contributors may be used to endorse or promote products derived -- |
| 16 | +-- from this software without specific prior written permission. -- |
| 17 | +-- -- |
| 18 | +-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -- |
| 19 | +-- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -- |
| 20 | +-- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -- |
| 21 | +-- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -- |
| 22 | +-- HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -- |
| 23 | +-- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -- |
| 24 | +-- LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -- |
| 25 | +-- DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -- |
| 26 | +-- THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -- |
| 27 | +-- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -- |
| 28 | +-- OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -- |
| 29 | +-- -- |
| 30 | +------------------------------------------------------------------------------ |
| 31 | + |
| 32 | +with Cortex_M_SVD.SysTick; use Cortex_M_SVD.SysTick; |
| 33 | + |
| 34 | +with HAL; use HAL; |
| 35 | + |
| 36 | +package body Cortex_M.Systick is |
| 37 | + |
| 38 | + --------------- |
| 39 | + -- Configure -- |
| 40 | + --------------- |
| 41 | + |
| 42 | + procedure Configure |
| 43 | + (Source : Clock_Source; |
| 44 | + Generate_Interrupt : Boolean; |
| 45 | + Reload_Value : HAL.UInt24) |
| 46 | + is |
| 47 | + begin |
| 48 | + SysTick_Periph.CSR.CLKSOURCE := |
| 49 | + (case Source is |
| 50 | + when CPU_Clock => Cpu_Clk, |
| 51 | + when External_Clock => External_Clk); |
| 52 | + |
| 53 | + SysTick_Periph.CSR.TICKINT := |
| 54 | + (if Generate_Interrupt then Enable else Disable); |
| 55 | + |
| 56 | + SysTick_Periph.RVR.RELOAD := Reload_Value; |
| 57 | + SysTick_Periph.CVR.CURRENT := Counter; |
| 58 | + end Configure; |
| 59 | + |
| 60 | + ------------ |
| 61 | + -- Enable -- |
| 62 | + ------------ |
| 63 | + |
| 64 | + procedure Enable is |
| 65 | + begin |
| 66 | + SysTick_Periph.CSR.ENABLE := Enable; |
| 67 | + end Enable; |
| 68 | + |
| 69 | + ------------- |
| 70 | + -- Disable -- |
| 71 | + ------------- |
| 72 | + |
| 73 | + procedure Disable is |
| 74 | + begin |
| 75 | + SysTick_Periph.CSR.ENABLE := Disable; |
| 76 | + end Disable; |
| 77 | + |
| 78 | + --------------------- |
| 79 | + -- Counted_To_Zero -- |
| 80 | + --------------------- |
| 81 | + |
| 82 | + function Counted_To_Zero return Boolean is |
| 83 | + begin |
| 84 | + return SysTick_Periph.CSR.COUNTFLAG; |
| 85 | + end Counted_To_Zero; |
| 86 | + |
| 87 | + ------------- |
| 88 | + -- Counter -- |
| 89 | + ------------- |
| 90 | + |
| 91 | + function Counter return HAL.UInt24 is |
| 92 | + begin |
| 93 | + return SysTick_Periph.CVR.CURRENT; |
| 94 | + end Counter; |
| 95 | + |
| 96 | +end Cortex_M.Systick; |
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