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Configure MCU pins properly to avoid floating inputs

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This reduces the power consumption of the MCU significantly.
This commit is contained in:
Ondrej Jirman 2023-02-17 16:46:12 +01:00
parent 3e2fc2a6ed
commit b24b0f1d84
1 changed files with 38 additions and 3 deletions
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41
firmware/main.c
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@ -1969,13 +1969,48 @@ void main(void)
// keep UART, SPI, and I2C A in reset
//P0_PRST |= BIT(0) | BIT(2) | BIT(3);
// setup MCU pins
//
// pogo: P90 P92 P93 (pulled-up from phone side)
// i2c for pmic: P85 P86 P87
// matrix rows: P60-P65
// matrix cols: P95-97 P50-57 P80
// PCB pads top/NC: P70-73 P76 P77 P83-P87
// PCB pads bottom/NC: P81 P82
// NC: P66 P67 P91 P94
// USB: P74/D+ P75/D-
//
// NC pins must be in input mode and pulled high, or in out low, therfore:
//
// PHCON0 : P5 - no pull up, output low
// PHCON1 : P6 - all pull up
// PHCON2 : bits
// 0: P7 0-3 - pull up
// 1: P7 4-7 - pull up
// 2: P8 0-3 - no pull up, all out low, P80 must not have pull-up
// 3: P8 4-7 - no pull up, pmic i2c has its own pull-up
// 4: P9 0-3 - no pull up, P91 out low, pullups on phone side
// 5: P9 4-7 - no pull up, all out low
// enable pullups only all port 6 pins and make those pins into input
PAGESW = 0;
P0_PHCON0 = 0x00;
P0_PHCON1 = 0xffu; // port 6 pull-up enable
P0_P6M0 = 0xff; // port 6 input
P0_PHCON1 = 0xff; // port 6 pull-up enable
P5 = 0x00;
P6 = 0xff;
P7 = 0xff;
P8 = 0x00;
P9 = 0x00;
P0_P5M0 = 0x00;
P0_P6M0 = 0xff;
P0_P7M0 = 0xff;
P0_P8M0 = 0x00;
PAGESW = 1;
P1_PHCON2 = 0x00;
P1_PHCON2 = 0x03;
P1_P9M0 = 0x0d; // pogo i2c/int remain as inputs
// enable auto-tuning internal RC oscillator based on USB SOF packets
P1_IRCCTRL &= ~BIT(1); // disable manual trim