因测试发现24M晶体偏高25ppm,想用软件调整,在哪里配置这个参数?
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因测试发现24M晶体偏高25ppm,想用软件调整,在哪里配置这个参数?
您好:为了调整电容负载值 找资料如下
#ifndef SET_CCFG_MODE_CONF_XOSC_CAP_MOD
// #define SET_CCFG_MODE_CONF_XOSC_CAP_MOD 0x0 // Apply cap-array delta
#define SET_CCFG_MODE_CONF_XOSC_CAP_MOD 0x1 // Don't apply cap-array delta
#endif
#ifndef SET_CCFG_MODE_CONF_XOSC_CAPARRAY_DELTA
#define SET_CCFG_MODE_CONF_XOSC_CAPARRAY_DELTA 0xFF // Signed 8-
bit value, directly modifying trimmed XOSC cap-array value
#endif
The SET_CCFG_MODE_CONF_XOSC_CAP_MOD defines tells the system whether it should use the
default value or use an offset from the default value set by
SET_CCFG_MODE_CONF_XOSC_CAPARRAY_DELTA. The default cap-array values are 9 pF for
CC13x0/CC26x0 QFN, 5 pF for CC2640R2F WCSP,
此处#define SET_CCFG_MODE_CONF_XOSC_CAPARRAY_DELTA 0xFF 值为FF,是代表什么意思啊,对应的电容值是多少呢?
我的晶体频率测量偏高25ppm,此处这个值应该怎么休改啊。
Table 7. Cap-Array Delta 这个表怎么看呢,数值代表什么意思
Measured Capacitance on
Reference Board CCFG Delta Value for
CC2640R2F WCSP
上面两列代表什么意思
#ifndef SET_CCFG_MODE_CONF_XOSC_CAPARRAY_DELTA
#define SET_CCFG_MODE_CONF_XOSC_CAPARRAY_DELTA 0xFF // Signed 8- bit value, directly modifying trimmed XOSC cap-array value #endif
您好:下面的0xFF是默认值 为-1 对应pdf下面那个表的话,电容是下表的对应关系嘛(cc2640r2f)
SET_CCFG_MODE_CONF_XOSC_CAPARRAY_DELTA 0xFF