这周的作业是
给微控制器电路板增加输出元件
电路板设计
用 ERC 和 DRC 工具检查错误。确保没有错误后，导出黑白 png 文件。
电路板制作
依旧是用 Roland SMR-20 雕刻电路板。
1/64 刀头刻线路， 1/32 刀头切边缘。
焊元件
然后烧程序
make -f hello.RGB.45.make
sudo make -f hello.RGB.45.make program-usbtiny
avr-objcopy -O ihex hello.RGB.45.out hello.RGB.45.c.hex;\
avr-size --mcu=attiny45 --format=avr hello.RGB.45.out
AVR Memory Usage
----------------
Device: attiny45
Program: 338 bytes (8.3% Full)
(.text + .data + .bootloader)
Data: 0 bytes (0.0% Full)
(.data + .bss + .noinit)
avrdude -p t45 -P usb -c usbtiny -U flash:w:hello.RGB.45.c.hex
avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.01s
avrdude: Device signature = 0x1e9206
avrdude: NOTE: "flash" memory has been specified, an erase cycle will be performed
To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: reading input file "hello.RGB.45.c.hex"
avrdude: input file hello.RGB.45.c.hex auto detected as Intel Hex
avrdude: writing flash (338 bytes):
Writing | ################################################## | 100% 0.49s
avrdude: 338 bytes of flash written
avrdude: verifying flash memory against hello.RGB.45.c.hex:
avrdude: load data flash data from input file hello.RGB.45.c.hex:
avrdude: input file hello.RGB.45.c.hex auto detected as Intel Hex
avrdude: input file hello.RGB.45.c.hex contains 338 bytes
avrdude: reading on-chip flash data:
Reading | ################################################## | 100% 0.72s
avrdude: verifying ...
avrdude: 338 bytes of flash verified
avrdude: safemode: Fuses OK (H:FF, E:DF, L:62)
avrdude done. Thank you.
编程
在 Arduino 里面写程序。要先选好 ATtiny 板子，ATtiny45 芯片和 8 MHz internal clock。
int led1 = 1; // the PWM pin the LED is attached to
int led2 = 2;
int led3 = 0;
int brightness = 0; // how bright the LED is
int fadeAmount = 5; // how many points to fade the LED by
// the setup routine runs once when you press reset:
void setup() {
// declare pin 1,2,3 to be an output:
pinMode(led1, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
}
// the loop routine runs over and over again forever:
void loop() {
// set the brightness of pin 1,2,3:
analogWrite(led1, brightness);
analogWrite(led2, brightness);
analogWrite(led3, brightness);
// change the brightness for next time through the loop:
brightness = brightness + fadeAmount;
// reverse the direction of the fading at the ends of the fade:
if (brightness == 0 || brightness == 255) {
fadeAmount = -fadeAmount ;
}
// wait for 30 milliseconds to see the dimming effect
delay(30);
}
代码下载.
程序写好之后， Burn Bootloader 上传到电路板上。LED 开始工作：
