3.9
Absolute Address Allocation Specification
The destination is specified using the __directmap keyword in the CA78K0, whereas #pragma address is written immediately before the variable declaration in the CC-RL.
The format of the CA78K0 is as follows.
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__directmap [__sreg] [static] type-name variable-name = location-address;
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The format of the CC-RL is as follows.
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#pragma address variable-name = location-address
variable-declaration
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- | Since the memory map is different between the 78K0 and RL78, a message is output. |
- | The CcnvCA78K0 deletes the __directmap keyword and adds #pragma address just before the variable declaration. The address specification is deleted from the variable declaration and execution moves to the address specification of #pragma address. |
- | When a macro or function pointer is used in a description using the __directmap keyword, the function name may be interpreted erroneously. Perform conversion after expanding the macro in advance. The location specification of the function pointer has to be modified manually. |
- | If different variables are assigned to the same address with __directmap, a compile error will occur in the CC-RL after conversion. Care is required because the CcnvCA78K0 does not check whether different variables are being assigned to the same address. |
[Examples]
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Pattern 1
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Before conversion
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__directmap int i = 0xfe00;
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After conversion
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#pragma address i=0xfe00
int i;
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Pattern 2
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Before conversion
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__directmap int* i = 0xfe00;
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After conversion
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#pragma address i=0xfe00
int* i;
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Pattern 3
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Before conversion
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__directmap int i = 0xfe00, j=0xfe10;
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After conversion
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#pragma address i=0xfe00
#pragma address j=0xfe10
int i,j;
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Pattern 4
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Before conversion
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__directmap struct x {
char a;
char b;
} xx = { 0xfe30 };
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After conversion
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#pragma address xx=0xfe30
struct x {
char a;
char b;
} xx;
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Pattern 5
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Before conversion
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#define MY_MACRO1 (int i = 0xfe00)
__directmap MY_MACRO1;
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After conversion
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#define MY_MACRO1 (int i = 0xfe00)
__directmap MY_MACRO1;
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Corrective action
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Perform conversion after expending the macro.
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Pattern 6
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Before conversion
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__directmap void (*fp[])(void) = 0x1234;
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After conversion
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#pragma address void=0x1234
void (*fp[])(void);
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Corrective action
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Manually write #pragma address for the CC-RL.
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