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Fixed non-compliant use of constexpr for pointers

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This commit is contained in:
BlackMark
2019-08-10 14:12:10 +02:00
parent 1ee9bc8ca4
commit c4700ed824
4 changed files with 66 additions and 28 deletions
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27
hardware0.hpp
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@@ -4,6 +4,7 @@
#include <avr/interrupt.h>
#include <avr/io.h>
#include <avr/sfr_defs.h>
#include "config.hpp"
#include "hardware.hpp"
@@ -16,15 +17,29 @@ 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
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 to work we need to temporarily disable the _SFR_MEM8 macro so that the register macro just gives the address
*/
#undef _SFR_MEM8
#define _SFR_MEM8
struct Registers0 {
static constexpr volatile auto *IO_REG = &UDR0;
static constexpr volatile auto *CTRL_STAT_REG_A = &UCSR0A;
static constexpr volatile auto *CTRL_STAT_REG_B = &UCSR0B;
static constexpr volatile auto *CTRL_STAT_REG_C = &UCSR0C;
static constexpr volatile auto *BAUD_REG_L = &UBRR0L;
static constexpr volatile auto *BAUD_REG_H = &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;
};
#undef _SFR_MEM8
#define _SFR_MEM8(mem_addr) _MMIO_BYTE(mem_addr)
enum class ControlFlagsA0 {
MULTI_PROC_COMM_MODE = MPCM0,
SPEED_2X = U2X0,