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Add core support for multiple UARTs (#152)

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* machine/uart: add core support for multiple UARTs by allowing for multiple RingBuffers
* machine/uart: complete core support for multiple UARTs
* machine/uart: no need to store pointer to UART, better to treat like I2C and SPI
* machine/uart: increase ring buffer size to 128 bytes
* machine/uart: improve godocs comments and use comma-ok idiom for buffer Put/Get methods
This commit is contained in:
Ron Evans
2019-01-25 22:09:13 +01:00
committed by GitHub
parent d820c36c4f
commit 4f4d7976c6
12 changed files with 216 additions and 77 deletions
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src/examples/echo/echo.go
+16 -9
View File
@@ -7,27 +7,34 @@ import (
"time"
)
// change these to test a different UART or pins if available
var (
uart = machine.UART0
tx uint8 = machine.UART_TX_PIN
rx uint8 = machine.UART_RX_PIN
)
func main() {
machine.UART0.Configure(machine.UARTConfig{})
machine.UART0.Write([]byte("Echo console enabled. Type something then press enter:\r\n"))
uart.Configure(machine.UARTConfig{TX: tx, RX: rx})
uart.Write([]byte("Echo console enabled. Type something then press enter:\r\n"))
input := make([]byte, 64)
i := 0
for {
if machine.UART0.Buffered() > 0 {
data, _ := machine.UART0.ReadByte()
if uart.Buffered() > 0 {
data, _ := uart.ReadByte()
switch data {
case 13:
// return key
machine.UART0.Write([]byte("\r\n"))
machine.UART0.Write([]byte("You typed: "))
machine.UART0.Write(input[:i])
machine.UART0.Write([]byte("\r\n"))
uart.Write([]byte("\r\n"))
uart.Write([]byte("You typed: "))
uart.Write(input[:i])
uart.Write([]byte("\r\n"))
i = 0
default:
// just echo the character
machine.UART0.WriteByte(data)
uart.WriteByte(data)
input[i] = data
i++
}