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PM0214 Scheda tecnica(PDF) 35 Page - STMicroelectronics |
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PM0214 Scheda tecnica(HTML) 35 Page - STMicroelectronics |
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35 / 245 page  DocID022708 Rev 4 35/245 PM0214 The Cortex-M4 processor 244 2.2.8 Programming hints for the synchronization primitives ISO/IEC C cannot directly generate the exclusive access instructions. CMSIS provides intrinsic functions for generation of these instructions: For example: uint16_t value; uint16_t *address = 0x20001002; value = __LDREXH (address); // load 16-bit value from memory address //0x20001002 Table 16. CMSIS functions for exclusive access instructions Instruction CMSIS function LDREX uint32_t __LDREXW (uint32_t *addr) LDREXH uint16_t __LDREXH (uint16_t *addr) LDREXB uint8_t __LDREXB (uint8_t *addr) STREX uint32_t __STREXW (uint32_t value, uint32_t *addr) STREXH uint32_t __STREXH (uint16_t value, uint16_t *addr) STREXB uint32_t __STREXB (uint8_t value, uint8_t *addr) CLREX void __CLREX (void) |
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