本系列文章使用Go语言开发Arduino，该文章讲解硬串口通信的用法。
一、硬件连接使用Arduino nano和普通的蓝牙模块：
查看machine库里已定义好的引脚：
// UART pins
const (
UART_TX_PIN Pin = PD1
UART_RX_PIN Pin = PD0
)
arduino nano的引脚定义如下：
因此，我们的硬件连接如下：
| Arduino nano | 蓝牙模块 |
|---|---|
| D0 | TXD |
| D1 | RXD |
| 5V | VCC |
| GND | GND |
machine库中对arduino nano引脚的定义：
//go:build arduino_nano
// +build arduino_nano
package machine
// Return the current CPU frequency in hertz.
func CPUFrequency() uint32 {
return 16000000
}
// Digital pins.
const (
D0 = PD0 // RX0
D1 = PD1 // TX1
D2 = PD2
D3 = PD3
D4 = PD4
D5 = PD5
D6 = PD6
D7 = PD7
D8 = PB0
D9 = PB1
D10 = PB2
D11 = PB3
D12 = PB4
D13 = PB5
)
// LED on the Arduino
const LED Pin = D13
// ADC on the Arduino
const (
ADC0 Pin = PC0
ADC1 Pin = PC1
ADC2 Pin = PC2
ADC3 Pin = PC3
ADC4 Pin = PC4 // Used by TWI for SDA
ADC5 Pin = PC5 // Used by TWI for SCL
)
// UART pins
const (
UART_TX_PIN Pin = PD1
UART_RX_PIN Pin = PD0
)
我们要实现的目标是：当使用蓝牙发送1的时候，板载LED亮；发送0的时候，板载LED灭。
代码如下：
package main
import (
"machine"
"time"
)
var (
uart = machine.UART0
tx = machine.UART_TX_PIN
rx = machine.UART_RX_PIN
led = machine.LED
)
func main() {
uart.Configure(machine.UARTConfig{TX: tx, RX: rx})
for {
if uart.Buffered() > 0 {
data, _ := uart.ReadByte()
if data == '0' {
led.Low()
}
if data == '1' {
led.High()
}
}
time.Sleep(10 * time.Millisecond)
}
}
其次，当我们把鼠标放到UART0的时候，提示为UART0属于硬串口：
注意！！！在烧录程序的过程中需要把D0和D1上的连线断开！
否则，将会因为硬串口被占用而无法烧录程序，并报如下错误：
avrdude error: programmer is not responding
avrdude warning: attempt 1 of 10: not in sync: resp=0x00
avrdude error: programmer is not responding
avrdude warning: attempt 2 of 10: not in sync: resp=0x00
avrdude error: programmer is not responding
avrdude warning: attempt 3 of 10: not in sync: resp=0x00
avrdude error: programmer is not responding
avrdude warning: attempt 4 of 10: not in sync: resp=0x00
avrdude error: unable to read: 拒绝访问。
avrdude error: programmer is not responding
avrdude warning: attempt 5 of 10: not in sync: resp=0x00
avrdude error: unable to read: 拒绝访问。
avrdude error: unable to write: sorry no info avail
avrdude error: unable to read: 拒绝访问。
avrdude error: programmer is not responding
avrdude warning: attempt 6 of 10: not in sync: resp=0x00
avrdude error: unable to read: 拒绝访问。
avrdude error: unable to write: sorry no info avail
avrdude error: unable to read: 拒绝访问。
avrdude error: programmer is not responding
avrdude warning: attempt 7 of 10: not in sync: resp=0x00
avrdude error: unable to read: 拒绝访问。
avrdude error: unable to write: sorry no info avail
avrdude error: unable to read: 拒绝访问。
avrdude error: programmer is not responding
avrdude warning: attempt 8 of 10: not in sync: resp=0x00
avrdude error: unable to read: 拒绝访问。
avrdude error: unable to write: sorry no info avail
avrdude error: unable to read: 拒绝访问。
avrdude error: programmer is not responding
avrdude warning: attempt 9 of 10: not in sync: resp=0x00
avrdude error: unable to read: 拒绝访问。
avrdude error: unable to write: sorry no info avail
avrdude error: unable to read: 拒绝访问。
avrdude error: programmer is not responding
avrdude warning: attempt 10 of 10: not in sync: resp=0x00
avrdude error: unable to read: 拒绝访问。
avrdude error: unable to open programmer arduino on port COM3
avrdude done. Thank you.
使用手机蓝牙助手连接蓝牙模块，即可控制板载LED的亮灭：
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