func UART_WRITE(comPortId: uint32, str: c_string, size: uint) -> int32 {
    if size <= UART_TX_BUF_SIZE {
        return UART_WRITE_DATA(comPortId, str, size)
    }

    var p: pointer = str
    var fracSize = size
    while fracSize > UART_TX_BUF_SIZE {
        UART_WRITE_DATA(comPortId, p, UART_TX_BUF_SIZE)
        p += UART_TX_BUF_SIZE
        fracSize -= UART_TX_BUF_SIZE
    }
    return UART_WRITE_DATA(comPortId, p, fracSize)
}


func UART_WAIT_LINE(comPortId: uint32) -> c_string {
    var prevRxSize: uint32 = 0

    var p: pointer = UART_RX_BUF(comPortId)
    while p[prevRxSize] != '\n' {
        while prevRxSize == UART_RX_SIZE(comPortId) {
            DelayMs(1)
        }

        let rxSize = UART_RX_SIZE(comPortId)

        for i in prevRxSize ..< rxSize {
            if p[i] == '\n' || p[i] == '\0' {
                return p[i]
            }
        }

        prevRxSize = rxSize
    } 
    return p
}