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Configure unused and/or output only pins

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This commit is contained in:
Allen Hill 2023-08-23 16:58:40 -04:00
parent 368ac7cb5f
commit 4952ecb12b
1 changed files with 22 additions and 2 deletions
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24
src/sniffer.c
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@ -206,9 +206,29 @@ void Setup() {
showLog = 1; showLog = 1;
showLog2 = 1; showLog2 = 1;
// Default is zero; resetting/zeroing unnecessary // Handle unconnected pins PA3, PB3-5
// MCUCR = 0; // Set as inputs
PORTA.DIRCLR = PIN3_bm;
PORTB.DIRCLR = (PIN3_bm | PIN4_bm | PIN5_bm);
// Enable pull-up resistor and disable input buffer (reduces any EM caused pin
// toggling and saves power)
PORTA.PIN3CTRL = PORT_PULLUPEN_bm | PORT_ISC_INPUT_DISABLE_gc;
PORTB.PIN3CTRL = PORT_PULLUPEN_bm | PORT_ISC_INPUT_DISABLE_gc;
PORTB.PIN4CTRL = PORT_PULLUPEN_bm | PORT_ISC_INPUT_DISABLE_gc;
PORTB.PIN5CTRL = PORT_PULLUPEN_bm | PORT_ISC_INPUT_DISABLE_gc;
// Output only pins: PA4-5, PC0-1, PC3, PB2
// TODO: TxD (PA1), RTS (PB0) is output only, test if RxD needs the input
// buffer or if the UART peripheral bypasses it
PORTA.PIN4CTRL = PORT_ISC_INPUT_DISABLE_gc;
PORTA.PIN5CTRL = PORT_ISC_INPUT_DISABLE_gc;
PORTC.PIN0CTRL = PORT_ISC_INPUT_DISABLE_gc;
PORTC.PIN1CTRL = PORT_ISC_INPUT_DISABLE_gc;
PORTC.PIN3CTRL = PORT_ISC_INPUT_DISABLE_gc;
PORTB.PIN2CTRL = PORT_ISC_INPUT_DISABLE_gc;
// Setup RTC as 1 sec periodic timer
loop_until_bit_is_clear(RTC_STATUS, RTC_CTRLABUSY_bp); loop_until_bit_is_clear(RTC_STATUS, RTC_CTRLABUSY_bp);
RTC.CTRLA = RTC_PRESCALER_DIV1_gc; RTC.CTRLA = RTC_PRESCALER_DIV1_gc;
RTC.CLKSEL = RTC_CLKSEL_INT32K_gc; RTC.CLKSEL = RTC_CLKSEL_INT32K_gc;