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Undid accidental regression

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This commit is contained in:
BlackMark 2019-08-15 18:49:29 +02:00
parent 1bdc06a325
commit f6df6a6a18
2 changed files with 34 additions and 18 deletions
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26
hardware0.hpp
View File

@ -19,22 +19,30 @@ namespace detail {
#if defined(__AVR_ATmega1284P__) || defined(__AVR_ATmega328P__)
/*
The following works in avr-gcc 5.4.0, but is not legal C++, because ptr's are not legal constexpr's
The following works in avr-gcc 5.4.0, but is not legal C++, because ptr's are not legal constexpr's:
constexpr auto *foo = ptr;
Workaround is to store the the address of the ptr in a uintptr_t and reinterpret_cast it at call site
For this the sfr_defs.h provides a macro which returns the address of a register
Workaround is to store the the address of the ptr in a uintptr_t and reinterpret_cast it at call site.
The _SFR_ADDR macro in sfr_defs.h would give the address, but it does that by taking the address of the dereferenced
pointer and casts it to uint16_t, which is still not a legal constexpr.
The workaround therefore is to disable the pointer cast and dereference macro _MMIO_BYTE temporarily.
*/
#pragma push_macro("_MMIO_BYTE")
#undef _MMIO_BYTE
#define _MMIO_BYTE
struct Registers0 {
static constexpr uintptr_t IO_REG_ADDR = _SFR_ADDR(UDR0);
static constexpr uintptr_t CTRL_STAT_REG_A_ADDR = _SFR_ADDR(UCSR0A);
static constexpr uintptr_t CTRL_STAT_REG_B_ADDR = _SFR_ADDR(UCSR0B);
static constexpr uintptr_t CTRL_STAT_REG_C_ADDR = _SFR_ADDR(UCSR0C);
static constexpr uintptr_t BAUD_REG_L_ADDR = _SFR_ADDR(UBRR0L);
static constexpr uintptr_t BAUD_REG_H_ADDR = _SFR_ADDR(UBRR0H);
static constexpr uintptr_t IO_REG_ADDR = UDR0;
static constexpr uintptr_t CTRL_STAT_REG_A_ADDR = UCSR0A;
static constexpr uintptr_t CTRL_STAT_REG_B_ADDR = UCSR0B;
static constexpr uintptr_t CTRL_STAT_REG_C_ADDR = UCSR0C;
static constexpr uintptr_t BAUD_REG_L_ADDR = UBRR0L;
static constexpr uintptr_t BAUD_REG_H_ADDR = UBRR0H;
};
#pragma pop_macro("_MMIO_BYTE")
enum class ControlFlagsA0 {
MULTI_PROC_COMM_MODE = MPCM0,
SPEED_2X = U2X0,

26
hardware1.hpp
View File

@ -19,22 +19,30 @@ namespace detail {
#if defined(__AVR_ATmega1284P__)
/*
The following works in avr-gcc 5.4.0, but is not legal C++, because ptr's are not legal constexpr's
The following works in avr-gcc 5.4.0, but is not legal C++, because ptr's are not legal constexpr's:
constexpr auto *foo = ptr;
Workaround is to store the the address of the ptr in a uintptr_t and reinterpret_cast it at call site
For this the sfr_defs.h provides a macro which returns the address of a register
Workaround is to store the the address of the ptr in a uintptr_t and reinterpret_cast it at call site.
The _SFR_ADDR macro in sfr_defs.h would give the address, but it does that by taking the address of the dereferenced
pointer and casts it to uint16_t, which is still not a legal constexpr.
The workaround therefore is to disable the pointer cast and dereference macro _MMIO_BYTE temporarily.
*/
#pragma push_macro("_MMIO_BYTE")
#undef _MMIO_BYTE
#define _MMIO_BYTE
struct Registers1 {
static constexpr uintptr_t IO_REG_ADDR = _SFR_ADDR(UDR1);
static constexpr uintptr_t CTRL_STAT_REG_A_ADDR = _SFR_ADDR(UCSR1A);
static constexpr uintptr_t CTRL_STAT_REG_B_ADDR = _SFR_ADDR(UCSR1B);
static constexpr uintptr_t CTRL_STAT_REG_C_ADDR = _SFR_ADDR(UCSR1C);
static constexpr uintptr_t BAUD_REG_L_ADDR = _SFR_ADDR(UBRR1L);
static constexpr uintptr_t BAUD_REG_H_ADDR = _SFR_ADDR(UBRR1H);
static constexpr uintptr_t IO_REG_ADDR = UDR1;
static constexpr uintptr_t CTRL_STAT_REG_A_ADDR = UCSR1A;
static constexpr uintptr_t CTRL_STAT_REG_B_ADDR = UCSR1B;
static constexpr uintptr_t CTRL_STAT_REG_C_ADDR = UCSR1C;
static constexpr uintptr_t BAUD_REG_L_ADDR = UBRR1L;
static constexpr uintptr_t BAUD_REG_H_ADDR = UBRR1H;
};
#pragma pop_macro("_MMIO_BYTE")
enum class ControlFlagsA1 {
MULTI_PROC_COMM_MODE = MPCM1,
SPEED_2X = U2X1,