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xro:beaglebone [2015-12-09 00:29] xro |
xro:beaglebone [2015-12-09 02:11] xro |
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In both cases, you still need a pin to connect the EN signal or power-relay for our peripherals, | In both cases, you still need a pin to connect the EN signal or power-relay for our peripherals, | ||
- | a PIN that you can trust to stay in a certain state during and after bootup. | + | a PIN that you can trust to pull your pheripheral LOW even during bootup. |
+ | |||
+ | A good choice for that are most pins that, per default, are muxed not to the GPIOchips but to internal devices like UART, SPI, I2C. | ||
+ | |||
+ | The following is a list of measurement, which pins pull which direction (HIGH/LOW) during bootup. | ||
+ | ^PIN^ Test1 ^ Test2 ^ Test3 ^ | ||
+ | |P8_01 | 0 (DGND) ||| | ||
+ | |P8_02 | 0 (DGND) ||| | ||
+ | |P8_03 | 1 | 1 || | ||
+ | |P8_04 | 1 | 1 || | ||
+ | |P8_05 | 1 | 1 || | ||
+ | |P8_06 | 1 | 1 || | ||
+ | |P8_07 | 1 | 1 || | ||
+ | |P8_08 | 1 | 1 || | ||
+ | |P8_09 | 1 | 1 || | ||
+ | |P8_10 | 1 | 1 || | ||
+ | |P8_11 | 0 | 0 || | ||
+ | |P8_12 | 0 | 0 || | ||
+ | |P8_13 | 0 | 0 || | ||
+ | |P8_14 | 0 | 0 || | ||
+ | |P8_15 | 0 | 0 || | ||
+ | |P8_16 | 0 | 0 || | ||
+ | |P8_17 | 0 | 0 || | ||
+ | |P8_18 | 0 | 0 || | ||
+ | |P8_19 | 0 | 0 || | ||
+ | |P8_20 | 0 | 1 || | ||
+ | |P8_21 | high freq signal, 0 ||| | ||
+ | |P8_22 | float or high-freq, 1 ||| | ||
+ | |P8_23 | 1 | 1 || | ||
+ | |P8_24 | 1 | 1 || | ||
+ | |P8_25 | PWM signal 1 || | ||
+ | |P8_26 | 1 | 1 || | ||
+ | |P8_27 | 0 | 0 || | ||
+ | |P8_28 | 1 | 0 || | ||
+ | |P8_29 | 0 | 0 || | ||
+ | |P8_30 | 0 | 0 || | ||
+ | |P8_31 | 1 | 1 || | ||
+ | |P8_32 | 1 | 0 || | ||
+ | |P8_33 | 0 | 0 | 0 | | ||
+ | |P8_34 | 0 | 0 | 0 | | ||
+ | |P8_35 | 0 ||| | ||
+ | |P8_36 | 0 ||| | ||
+ | |P8_37 | 0 ||| | ||
+ | |P8_38 | 0 ||| | ||
+ | |P8_39 | 0 ||| | ||
+ | |P8_40 | 0 ||| | ||
+ | |P8_41 | 1 ||| | ||
+ | |P8_42 | 1 ||| | ||
+ | |P8_43 | 1 ||| | ||
+ | |P8_44 | 1 ||| | ||
+ | |P8_45 | 0 ||| | ||
+ | |P8_46 | 0 ||| | ||
+ | |P9_01 | 0 (DGND) ||| | ||
+ | |P9_02 | 0 (DGND) ||| | ||
+ | |P9_03 | 1 (3V3) ||| | ||
+ | |P9_04 | 1 (3V3) ||| | ||
+ | |P9_05 | 1 (VDD 5V) ||| | ||
+ | |P9_06 | 1 (VDD 5V) ||| | ||
+ | |P9_07 | 1 (SYS 5V) ||| | ||
+ | |P9_08 | 1 (SYS 5V) ||| | ||
+ | |P9_09 | PWR_BUT ||| | ||
+ | |P9_10 | 1 (SYS_RESET) ||| | ||
+ | |P9_11 | ||| | ||
+ | |P9_12 | 1 ||| | ||
+ | |P9_13 | 1 ||| | ||
+ | |P9_14 | 0 ||| | ||
+ | |P9_15 | pulsing 1 , every 480µs ||| | ||
+ | |P9_16 | 0 | 0 || | ||
+ | |P9_17 | 0 | 0 || | ||
+ | |P9_18 | 1 | 0 || | ||
+ | |P9_19 | 1 | 1 || | ||
+ | |P9_20 | 1 | 1 || | ||
+ | |P9_21 | 1 | 1 | 1 | | ||
+ | |P9_22 | 1 | 1 | 1 | | ||
+ | |P9_23 | 0 | 0 || | ||
+ | |P9_24 | 1 | 1 || | ||
+ | |P9_25 | 0 | 0 || | ||
+ | |P9_26 | 1 | 1 || | ||
+ | |P9_27 | 0 | 0 || | ||
+ | |P9_28 | 0 | 0 || | ||
+ | |P9_29 | 0 | 0 || | ||
+ | |P9_30 | 0 | 0 || | ||
+ | |P9_31 | 0 ||| | ||
+ | |P9_32 | 1 (VDD_ADC) ||| | ||
+ | |P9_33 | AIN4 ||| | ||
+ | |P9_34 | 0 (GND_ADC) ||| | ||
+ | |P9_35 | AIN6 ||| | ||
+ | |P9_36 | AIN5 ||| | ||
+ | |P9_37 | AIN2 ||| | ||
+ | |P9_38 | AIN3 ||| | ||
+ | |P9_39 | AIN0 ||| | ||
+ | |P9_40 | AIN1 ||| | ||
+ | |P9_41 | 0 | 0 || | ||
+ | |P9_42 | 0 | 0 || | ||
+ | |P9_43 | DGND ||| | ||
+ | |P9_44 | DGND ||| | ||
+ | |P9_45 | DGND ||| | ||
+ | |P9_46 | DGND ||| | ||
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