Merge pull request #215 from pfalcon/pfalcon
esp/gpio_regs.h: Add info about strapping pins captured in GPIO.IN register.
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c2953eda38
1 changed files with 16 additions and 0 deletions
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@ -40,6 +40,22 @@
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* be reset by writing to STATUS or STATUS_CLEAR.
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*
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* (_SET/_CLEAR function similarly to OUT registers)
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*
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* IN:
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*
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* Low 16 bits represent GPIO0-15 state (see also above).
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*
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* High 16 bits represent "strapping pins" values captured at reset time:
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* bit 31 - GPIO10 (SD_DATA3)
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* bit 30 - GPIO9 (SD_DATA2)
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* bit 29 - GPIO7 (SD_DATA0)
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* bit 18 - GPIO15 (MTDO)
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* bit 17 - GPIO0
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* bit 16 - GPIO2
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* (In other words, highest 3 and lowest 3 bits of 16-bit half-word are used).
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* BootROM uses strapping pin values to determine boot mode.
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*
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* Source and more information: 0D-ESP8266__Pin_List*.xlsx document
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*/
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struct GPIO_REGS {
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