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[ion] Documenting systick counter reload value

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Damien Nicolet
2018-11-07 00:45:49 +01:00
parent 92e59f720f
commit e397f05894
1 changed files with 3 additions and 0 deletions
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3
ion/src/device/device.cpp
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@@ -201,6 +201,9 @@ void initPeripherals() {
Console::Device::init();
SWD::Device::init();
// CPU clock is 96 MHz, and systick clock source is divided by 8
// To get 1 ms systick overflow we need to reset it to
// 96 000 000 (Hz) / 8 / 1 000 (ms/s) - 1 (because the counter resets *after* counting to 0)
CM4.SYST_RVR()->setRELOAD(11999);
CM4.SYST_CVR()->setCURRENT(0);
CM4.SYST_CSR()->setCLKSOURCE(CM4::SYST_CSR::CLKSOURCE::AHB_DIV8);