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[ion/device] External flash: SetReadParameters (dummy cycles) according to clock frequency

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This commit is contained in:
Ruben Dashyan
2018-12-17 16:32:04 +01:00
parent 534b6b7816
commit 36c9966419
2 changed files with 13 additions and 0 deletions
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12
ion/src/device/external_flash.cpp
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@@ -199,6 +199,18 @@ void initChip() {
wait(QUADSPI::CCR::OperatingMode::Single);
send_command(Command::EnableQPI, QUADSPI::CCR::OperatingMode::Single);
wait();
if (ClockFrequencyDivisor == 1) {
class ReadParameters : Register8 {
public:
/* Parameters sent along with SetReadParameters instruction in order
* to configure the number of dummy cycles for the QPI Read instructions. */
using Register8::Register8;
REGS_BOOL_FIELD_W(P5, 1);
};
ReadParameters readParameters(0);
readParameters.setP5(true);
send_write_command(Command::SetReadParameters, reinterpret_cast<uint8_t *>(FlashAddressSpaceSize), reinterpret_cast<uint8_t *>(&readParameters), sizeof(readParameters));
}
}
set_as_memory_mapped();
}

1
ion/src/device/external_flash.h
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@@ -60,6 +60,7 @@ enum class Command : uint8_t {
// Erase the whole chip or a 64-Kbyte block as being "1"
ChipErase = 0xC7,
Erase64KbyteBlock = 0xD8,
SetReadParameters = 0xC0
};
constexpr static uint32_t QSPIBaseAddress = 0x90000000;