XMEGA Application Note | |||||
#include "avr_compiler.h"
Go to the source code of this file.
Functions | |
void | CCPWrite (volatile uint8_t *address, uint8_t value) |
CCP write helper function written in assembly. |
This file only contains a function prototype.
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Definition in file ccpwrite.h.
void CCPWrite | ( | volatile uint8_t * | address, | |
uint8_t | value | |||
) |
CCP write helper function written in assembly.
This function is written in assembly because of the time-critial operation of writing to the registers.
address | Pointer to the register to write to. | |
value | Value to write to the register. |
Definition at line 65 of file ccpwrite.c.
References ENTER_CRITICAL_REGION, and LEAVE_CRITICAL_REGION.
Referenced by main().
00066 { 00067 ENTER_CRITICAL_REGION( ); 00068 #ifdef __ICCAVR__ 00069 00070 asm("movw r30, r16"); 00071 #ifdef RAMPZ 00072 RAMPZ = 0; 00073 #endif 00074 asm("ldi r16, 0xD8 \n" 00075 "out 0x34, r16 \n" 00076 #if (__MEMORY_MODEL__ == 1) 00077 "st Z, r17 \n"); 00078 #elif (__MEMORY_MODEL__ == 2) 00079 "st Z, r18 \n"); 00080 #else /* (__MEMORY_MODEL__ == 3) || (__MEMORY_MODEL__ == 5) */ 00081 "st Z, r19 \n"); 00082 #endif /* __MEMORY_MODEL__ */ 00083 00084 #elif defined __GNUC__ 00085 volatile uint8_t * tmpAddr = address; 00086 #ifdef RAMPZ 00087 RAMPZ = 0; 00088 #endif 00089 asm volatile( 00090 "movw r30, %0" "\n\t" 00091 "ldi r16, %2" "\n\t" 00092 "out %3, r16" "\n\t" 00093 "st Z, %1" "\n\t" 00094 : 00095 : "r" (tmpAddr), "r" (value), "M" (CCP_IOREG_gc), "i" (&CCP) 00096 : "r16", "r30", "r31" 00097 ); 00098 00099 #endif 00100 LEAVE_CRITICAL_REGION( ); 00101 }
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