ROM
7.6.5.3
RMF_FLASH_UNSECURE output structure
This functions always succeeds. It returns a NULL pointer.
7.6.5.4
RMF_FLASH_UNSECURE access/security policies
This function may be called at any time.
External parties (slave port and BDM port) normally mass erase the device to clear security.
Example 7-12. Function access/security
call_trap(RMF_FLASH_UNSECURE, NULL);// clear security until next reset operation
7.6.6
7.6.6.1
RMF_CRC
Description
The RMF_CRC function uses a Cyclic Redundancy Check (CRC) function to generate a CRC value over
a specified range of memory. The 16-bit CRC-CCITT polynomial, x 16 + x 12 + x 5 + 1, is used to generate
the CRC code.
Features of the CRC function include:
? CRC16-CCITT compliancy with x 16 + x 12 + x 5 + 1 polynomial
? Error detection for all single, double, odd, and most multi-bit errors
? Programmable, initial-seed value
7.6.6.2
RMF_CRC input structure
Example 7-13. Input structure syntax
typedef struct {
unsigned long seed;
unsigned long starting_addr;
unsigned long ending_addr;
unsigned short reserved; // write as 0
} rmf_crc_params_t;
Table 7-48. rmf_crc_params_t input parameters
Parameter
seed
starting_addr
ending_addr
reserved
112
Description
This is the “seed” for the CRC algorithm.
Address of the first location in the memory map to be checked.
Address of the last location in the memory map to be checked.
Write as 0x0.
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
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