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Comment rationale behind Mizar32 pull-up resistor code on UART0 RX pin

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and make it happen before the UART (interrupt) is initialized.
This commit is contained in:
Martin Guy 2011-04-13 11:56:00 +02:00
parent a0cda92c75
commit 2873ac892a
1 changed files with 8 additions and 1 deletions
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9
src/platform/avr32/platform.c
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@ -184,11 +184,18 @@ int platform_init()
pwm_init(); pwm_init();
#endif #endif
cmn_platform_init();
#ifdef ELUA_BOARD_MIZAR32 #ifdef ELUA_BOARD_MIZAR32
// If BUF_ENABLE_UART is enabled on Mizar32 (which it is by default) but the
// serial board is not plugged in, we get an infinite number of interrupts
// due to the RX pin picking up electrical noise and crashing the board.
// We avoid this by enabling the internal pull-up resistor on that pin
// before the UART interrupt is enabled.
// UART0 RX pin is on GPIO port A pin 0, hence port 0, pin mask (1 << 0)
platform_pio_op( 0, ( pio_type )1 << 0 , PLATFORM_IO_PIN_PULLUP ); platform_pio_op( 0, ( pio_type )1 << 0 , PLATFORM_IO_PIN_PULLUP );
#endif #endif
cmn_platform_init();
// All done // All done
return PLATFORM_OK; return PLATFORM_OK;
} }