diff options
Diffstat (limited to 'firmware/libboard')
| -rw-r--r-- | firmware/libboard/qmod/source/board_qmod.c | 28 |
1 files changed, 20 insertions, 8 deletions
diff --git a/firmware/libboard/qmod/source/board_qmod.c b/firmware/libboard/qmod/source/board_qmod.c index dd6e616..0eda1ef 100644 --- a/firmware/libboard/qmod/source/board_qmod.c +++ b/firmware/libboard/qmod/source/board_qmod.c @@ -261,20 +261,32 @@ static int uart_has_loopback_jumper(void) /* Configure UART pins as I/O */ PIO_Configure(uart_loopback_pins, PIO_LISTSIZE(uart_loopback_pins)); + /* Send pattern over UART TX and check if it is received on RX + * If the loop doesn't get interrupted, RxD always follows TxD and thus a + * loopback jumper has been placed on RxD/TxD, and we will boot + * into DFU unconditionally + */ + int has_loopback_jumper = 1; for (i = 0; i < 10; i++) { /* Set TxD high; abort if RxD doesn't go high either */ PIO_Set(&uart_loopback_pins[1]); - if (!PIO_Get(&uart_loopback_pins[0])) - return 0; + if (!PIO_Get(&uart_loopback_pins[0])) { + has_loopback_jumper = 0; + break; + } /* Set TxD low, abort if RxD doesn't go low either */ PIO_Clear(&uart_loopback_pins[1]); - if (PIO_Get(&uart_loopback_pins[0])) - return 0; + if (PIO_Get(&uart_loopback_pins[0])) { + has_loopback_jumper = 0; + break; + } } - /* if we reached here, RxD always follows TxD and thus a - * loopback jumper has been placed on RxD/TxD, and we will boot - * into DFU unconditionally */ - return 1; + + /* Put pins back to UART mode */ + const Pin uart_pins[] = {PINS_UART}; + PIO_Configure(uart_pins, PIO_LISTSIZE(uart_pins)); + + return has_loopback_jumper; } int board_override_enter_dfu(void) |