星期五, 7月 14, 2006
some problem about QCOM
使用便宜的 主機板,配上QCOM的usb wifi。
結果一些機器常常發生QCOM的Wifi MAC Address 讀取 0xFFFFFF的狀況...(9/600)
查QCOM wifi dongle上有一顆AT46,大概是MAC Address的EEPROM吧..
Th 1 先生說,EEPROM的I/O pin腳要接pull high,否則power up時,mcu的pin腳或許會有不規則波形,影響到EEPROM,導致EEPROM被reset或修改(10000隻猴子在type writer上亂打,有機會會剛好打出一本 莎士比亞全集)。
QCOM當然是不會給線路圖囉,實際上 QCOM當初的contact windows也已經離職了。
所以,只好請Eng自己量一下...
LEO用全域搜尋法,用三用電錶量2,3,4 pin是否和哪一個 device是短路的....
目前 LEO量測出... DI pin 有一個電阻到VCC,但是沒有焊...@_@ ... (costdown 到這個程度 ???)
LEO 繼續量VCC , DI, power up的暫態時序。
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