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UART adaptations for modern Raspbian #56

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merged 2 commits into from
Sep 27, 2017
Merged

UART adaptations for modern Raspbian #56

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cb743d1
- Modernized tty naming ("serial0" / "serial1")
stephanmantler Sep 26, 2017
2d5b25c
- removed nonblocking flag (caused more trouble than benefits)
stephanmantler Sep 27, 2017
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58 changes: 42 additions & 16 deletions Sources/UART.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -33,17 +33,18 @@ extension SwiftyGPIO {
public static func UARTs(for board: SupportedBoard) -> [UARTInterface]? {
switch board {
case .CHIP:
return [SysFSUART("S0")!]
return [SysFSUART(["serial0","ttyAMA0"])!]
case .RaspberryPiRev1:
fallthrough
case .RaspberryPiRev2:
fallthrough
case .RaspberryPiPlusZero:
fallthrough
case .RaspberryPi2:
fallthrough
return [SysFSUART(["serial0","ttyAMA0"])!]
case .RaspberryPi3:
return [SysFSUART("AMA0")!]
return [SysFSUART(["serial0","ttyS0"])!,
SysFSUART(["serial1","ttyAMA0"])!]
default:
return nil
}
Expand Down Expand Up @@ -111,6 +112,8 @@ public enum StopBits {
}

public enum UARTSpeed {
case S2400
case S4800
case S9600
case S19200
case S38400
Expand All @@ -119,6 +122,12 @@ public enum UARTSpeed {

public func configure(_ cfg: inout termios) {
switch self {
case .S2400:
cfsetispeed(&cfg, speed_t(B2400))
cfsetospeed(&cfg, speed_t(B2400))
case .S4800:
cfsetispeed(&cfg, speed_t(B4800))
cfsetospeed(&cfg, speed_t(B4800))
case .S9600:
cfsetispeed(&cfg, speed_t(B9600))
cfsetospeed(&cfg, speed_t(B9600))
Expand All @@ -144,22 +153,39 @@ public final class SysFSUART: UARTInterface {
var tty: termios
var fd: Int32

public init?(_ uartId: String) {
device = "/dev/tty"+uartId
tty = termios()
public init?(_ uartIdList: [String]) {
// try all items in list until one works
for uartId in uartIdList {

device = "/dev/"+uartId
tty = termios()

fd = open(device, O_RDWR | O_NOCTTY | O_SYNC)
guard fd>0 else {
if errno == ENOENT {
// silently return nil if no such device
continue
}
perror("Couldn't open UART device")
continue
}

fd = open(device, O_RDWR | O_NOCTTY | O_SYNC)
guard fd>0 else {
perror("Couldn't open UART device")
abort()
}
let ret = tcgetattr(fd, &tty)

guard ret == 0 else {
close(fd)
perror("Couldn't get terminal attributes")
continue
}

let ret = tcgetattr(fd, &tty)
return
}

guard ret == 0 else {
perror("Couldn't get terminal attributes")
abort()
}
return nil
}

public convenience init?(_ uartId: String) {
self.init([uartId])
}

public func configureInterface(speed: UARTSpeed, bitsPerChar: CharSize, stopBits: StopBits, parity: ParityType) {
Expand Down