# Determine absolute sample number of a bit slot's sample point.
# Counts for UART bits start from 0 (0 = start bit, 1..x = data,
# x+1 = parity bit (if used) or the first stop bit, and so on).
# Determine absolute sample number of a bit slot's sample point.
# Counts for UART bits start from 0 (0 = start bit, 1..x = data,
# x+1 = parity bit (if used) or the first stop bit, and so on).