diff options
| -rw-r--r-- | src/avr/gpio.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/avr/gpio.c b/src/avr/gpio.c index ce89b1be..a6b7aa41 100644 --- a/src/avr/gpio.c +++ b/src/avr/gpio.c @@ -371,7 +371,9 @@ static const uint8_t MOSI = GPIO('B', 2), MISO = GPIO('B', 3); static void spi_init(void) { - gpio_out_setup(SS, 1); + if (!(GPIO2REGS(SS)->mode & GPIO2BIT(SS))) + // The SS pin must be an output pin (but is otherwise unused) + gpio_out_setup(SS, 0); gpio_out_setup(SCK, 0); gpio_out_setup(MOSI, 0); gpio_in_setup(MISO, 0); |