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#define | alt_write_byte(dest, src) (*ALT_CAST(volatile uint8_t *, (dest)) = (src)) |
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#define | alt_read_byte(src) (*ALT_CAST(volatile uint8_t *, (src))) |
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#define | alt_write_hword(dest, src) (*ALT_CAST(volatile uint16_t *, (dest)) = (src)) |
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#define | alt_read_hword(src) (*ALT_CAST(volatile uint16_t *, (src))) |
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#define | alt_write_word(dest, src) (*ALT_CAST(volatile uint32_t *, (dest)) = (src)) |
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#define | alt_read_word(src) (*ALT_CAST(volatile uint32_t *, (src))) |
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#define | alt_write_dword(dest, src) (*ALT_CAST(volatile uint64_t *, (dest)) = (src)) |
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#define | alt_read_dword(src) (*ALT_CAST(volatile uint64_t *, (src))) |
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This section implements read and write functionality for various memory untis. The memory unit terms used for these functions are consistent with those used in the ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition manual. The terms used for units of memory are:
Unit of Memory | Abbreviation | Size in Bits |
Byte | byte | 8 |
Half Word | hword | 16 |
Word | word | 32 |
Double Word | dword | 64 |
◆ alt_read_byte
#define alt_read_byte |
( |
|
src | ) |
(*ALT_CAST(volatile uint8_t *, (src))) |
Read and return the 8 bit byte from the source address in device memory.
- Parameters
-
src | Read source pointer address |
- Returns
- 8 bit data byte value
◆ alt_read_dword
#define alt_read_dword |
( |
|
src | ) |
(*ALT_CAST(volatile uint64_t *, (src))) |
Read and return the 64 bit double word from the source address in device memory.
- Parameters
-
src | Read source pointer address |
- Returns
- 64 bit data double word value
◆ alt_read_hword
#define alt_read_hword |
( |
|
src | ) |
(*ALT_CAST(volatile uint16_t *, (src))) |
Read and return the 16 bit half word from the source address in device memory.
- Parameters
-
src | Read source pointer address |
- Returns
- 16 bit data half word value
◆ alt_read_word
#define alt_read_word |
( |
|
src | ) |
(*ALT_CAST(volatile uint32_t *, (src))) |
Read and return the 32 bit word from the source address in device memory.
- Parameters
-
src | Read source pointer address |
- Returns
- 32 bit data word value
◆ alt_write_byte
#define alt_write_byte |
( |
|
dest, |
|
|
|
src |
|
) |
| (*ALT_CAST(volatile uint8_t *, (dest)) = (src)) |
Write the 8 bit byte to the destination address in device memory.
- Parameters
-
dest | - Write destination pointer address |
src | - 8 bit data byte to write to memory |
◆ alt_write_dword
#define alt_write_dword |
( |
|
dest, |
|
|
|
src |
|
) |
| (*ALT_CAST(volatile uint64_t *, (dest)) = (src)) |
Write the 64 bit double word to the destination address in device memory.
- Parameters
-
dest | - Write destination pointer address |
src | - 64 bit data double word to write to memory |
◆ alt_write_hword
#define alt_write_hword |
( |
|
dest, |
|
|
|
src |
|
) |
| (*ALT_CAST(volatile uint16_t *, (dest)) = (src)) |
Write the 16 bit half word to the destination address in device memory.
- Parameters
-
dest | - Write destination pointer address |
src | - 16 bit data half word to write to memory |
◆ alt_write_word
#define alt_write_word |
( |
|
dest, |
|
|
|
src |
|
) |
| (*ALT_CAST(volatile uint32_t *, (dest)) = (src)) |
Write the 32 bit word to the destination address in device memory.
- Parameters
-
dest | - Write destination pointer address |
src | - 32 bit data word to write to memory |