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MSP430单片机对BQ30Z55操作任何命令,反馈数据包里的PEC值都不正确



1、附件从官网下的程式范例   MSP430 Software for bq  --用I2C_USCI , MSP430对BQ30Z55操作 PEC值总是不正确,而其它BQ30Z55返回会的数据都是正确。比如SOC 值与PEC 图1 图2

2、同样的板子我用模拟I2C ,就没有错误存在,谁能帮忙我找找原因?    

test_pec.zip