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App Notes

Software & Driver

 

5.2.7 - WriteMem (WriteCal)

Writes 1 block (32 bytes) to the non-volatile user or calibration memory. Command number 0x28 accesses the user memory area which consists of 512 bytes (block numbers 0-7). Command number 0x2B accesses the calibration memory area consisting of 512 bytes (block numbers 0-15), of which the last 6 blocks are not used. Memory must be erased before writing. Do not call this function while streaming.

The U6 flash has a rated endurance of at least 20000 writes, which is plenty for reasonable operation, but if this function is called in a high-speed loop the flash could eventually be damaged. In the case of these functions, that means 20000 writes per 32-byte block.

Note that the U6 has 512 Bytes of user memory, but only 256 Bytes are accessible when using the LJ_chUSER_MEM function in the UD driver.

Table 5.2.7-1. WriteMem Command Response

Command:  
Byte  
0 Checksum8
1 0xF8
2 0×11
3 0×28 (0×2B)
4 Checksum16 (LSB)
5 Checksum16 (MSB)
6 0×00
7 BlockNum
8-39 32 Bytes of Data
   
Response:  
Byte  
0 Checksum8
1 0xF8
2 0×01
3 0×28 (0×2B)
4 Checksum16 (LSB)
5 Checksum16 (MSB)
6 Errorcode
7 0×00