AVR上的音频播放器



在对无线电电子垃圾和装箱的下一次审核中,我遇到了AVR atxmega256a3u控制器。为了消除无聊,决定制作某种声卡,或更确切地说,是将DAC连接到计算机。它产生了什么,见下切。

XMEGA微控制器系列是大多数MEGA控制器的电子爱好者所熟悉的开发,添加了许多有趣的东西,但以下描述的所有内容都可以在传统系列上实现。我只建议在有更多RAM的地方使用这些控制器。

从文字到开发,一经思考,我就想到了这样的设备结构:



我将播放8位单声道WAV文件中的音乐,采样频率为44.1 kHz。发送串行端口包含10个波特(起始和停止位,8个数据位),这意味着至少需要441 kBa / s的速度。该设备可使您工作更快,我的数据传输速率为2000 kBa / s,有一定余量。

控制器内部有一个FIFO缓冲区,它是先入先出队列。根据频率为44.1 kHz的计时器,触发一个中断,从缓冲区中提取下一个样本并将其传输到数模转换器,并且,如有必要,还从计算机请求下一个数据包。考虑到所有这些,我跟踪并蚀刻了微控制器的“调试”板:



此开发中最有趣的可能是DAC。我的微控制器具有内置的DAC,但这不是一项运动,大多数微控制器都不具备这种优势。没关系,您可以根据R-2R方案使用少量电阻器自己制作DAC:

图片

这样的电路可以让您获得从0 V到逻辑单元电平的电压输出,在我的情况下是3.3 V.我将制作一个八位DAC,我只有一个电阻器,其可接受的偏差为5%,这意味着由于(1 /2^5)<0.05。尽管如此,我希望最低有效位能够使信号的弱频谱成分发声。



我正在用5.1kΩ 电阻组装这样一个庞然大物:我立即放下TDA2822M放大器,使用桥接电路将它与数据表连接起来:



然后我制作了一个带有低音反射的音柱:



现在该倾听:



如果您连接更大的扬声器并变得更好,则听起来或多或少可以容忍。

MK代码
, . .

// I/O Registers definitions
#include <io.h>

// Declare your global variables here
#define fSIZE 12000
int rAdr,wAdr,dn;
char needdata;
char fifo[fSIZE]; 
// System Clocks initialization
void system_clocks_init(void)
{
unsigned char n,s;

// Optimize for speed
#pragma optsize- 
// Save interrupts enabled/disabled state
s=SREG;
// Disable interrupts
#asm("cli")

// External 16000,000 kHz oscillator initialization
// External Clock Source - Startup Time: 0.4-16 MHz Quartz Crystal - 16k CLK
OSC.XOSCCTRL=OSC_FRQRANGE_12TO16_gc | OSC_XOSCSEL_XTAL_16KCLK_gc;
// Enable the external oscillator/clock source
OSC.CTRL|=OSC_XOSCEN_bm;

// System Clock prescaler A division factor: 1
// System Clock prescalers B & C division factors: B:1, C:1
// ClkPer4: 16000,000 kHz
// ClkPer2: 16000,000 kHz
// ClkPer:  16000,000 kHz
// ClkCPU:  16000,000 kHz
n=(CLK.PSCTRL & (~(CLK_PSADIV_gm | CLK_PSBCDIV1_bm | CLK_PSBCDIV0_bm))) |
	CLK_PSADIV_1_gc | CLK_PSBCDIV_1_1_gc;
CCP=CCP_IOREG_gc;
CLK.PSCTRL=n;

// Wait for the external oscillator to stabilize
while ((OSC.STATUS & OSC_XOSCRDY_bm)==0);

// Select the system clock source: External Oscillator or Clock
n=(CLK.CTRL & (~CLK_SCLKSEL_gm)) | CLK_SCLKSEL_XOSC_gc;
CCP=CCP_IOREG_gc;
CLK.CTRL=n;

// Disable the unused oscillators: 2 MHz, 32 MHz, internal 32 kHz, PLL
OSC.CTRL&= ~(OSC_RC2MEN_bm | OSC_RC32MEN_bm | OSC_RC32KEN_bm | OSC_PLLEN_bm);

// ClkPer output disabled
PORTCFG.CLKEVOUT&= ~(PORTCFG_CLKOUTSEL_gm | PORTCFG_CLKOUT_gm);
// Restore interrupts enabled/disabled state
SREG=s;
// Restore optimization for size if needed
#pragma optsize_default
}

// Ports initialization
void ports_init(void)
{
// PORTA initialization
// OUT register
PORTA.OUT=0x00;
// Pin0: Input
// Pin1: Input
// Pin2: Input
// Pin3: Input
// Pin4: Input
// Pin5: Input
// Pin6: Input
// Pin7: Input
PORTA.DIR=0x00;
// Pin0 Output/Pull configuration: Totempole/No
// Pin0 Input/Sense configuration: Sense both edges
// Pin0 Inverted: Off
// Pin0 Slew Rate Limitation: Off
PORTA.PIN0CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin1 Output/Pull configuration: Totempole/No
// Pin1 Input/Sense configuration: Sense both edges
// Pin1 Inverted: Off
// Pin1 Slew Rate Limitation: Off
PORTA.PIN1CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin2 Output/Pull configuration: Totempole/No
// Pin2 Input/Sense configuration: Sense both edges
// Pin2 Inverted: Off
// Pin2 Slew Rate Limitation: Off
PORTA.PIN2CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin3 Output/Pull configuration: Totempole/No
// Pin3 Input/Sense configuration: Sense both edges
// Pin3 Inverted: Off
// Pin3 Slew Rate Limitation: Off
PORTA.PIN3CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin4 Output/Pull configuration: Totempole/No
// Pin4 Input/Sense configuration: Sense both edges
// Pin4 Inverted: Off
// Pin4 Slew Rate Limitation: Off
PORTA.PIN4CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin5 Output/Pull configuration: Totempole/No
// Pin5 Input/Sense configuration: Sense both edges
// Pin5 Inverted: Off
// Pin5 Slew Rate Limitation: Off
PORTA.PIN5CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin6 Output/Pull configuration: Totempole/No
// Pin6 Input/Sense configuration: Sense both edges
// Pin6 Inverted: Off
// Pin6 Slew Rate Limitation: Off
PORTA.PIN6CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin7 Output/Pull configuration: Totempole/No
// Pin7 Input/Sense configuration: Sense both edges
// Pin7 Inverted: Off
// Pin7 Slew Rate Limitation: Off
PORTA.PIN7CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Interrupt 0 level: Disabled
// Interrupt 1 level: Disabled
PORTA.INTCTRL=(PORTA.INTCTRL & (~(PORT_INT1LVL_gm | PORT_INT0LVL_gm))) |
	PORT_INT1LVL_OFF_gc | PORT_INT0LVL_OFF_gc;
// Pin0 Pin Change interrupt 0: Off
// Pin1 Pin Change interrupt 0: Off
// Pin2 Pin Change interrupt 0: Off
// Pin3 Pin Change interrupt 0: Off
// Pin4 Pin Change interrupt 0: Off
// Pin5 Pin Change interrupt 0: Off
// Pin6 Pin Change interrupt 0: Off
// Pin7 Pin Change interrupt 0: Off
PORTA.INT0MASK=0x00;
// Pin0 Pin Change interrupt 1: Off
// Pin1 Pin Change interrupt 1: Off
// Pin2 Pin Change interrupt 1: Off
// Pin3 Pin Change interrupt 1: Off
// Pin4 Pin Change interrupt 1: Off
// Pin5 Pin Change interrupt 1: Off
// Pin6 Pin Change interrupt 1: Off
// Pin7 Pin Change interrupt 1: Off
PORTA.INT1MASK=0x00;

// PORTB initialization
// OUT register
PORTB.OUT=0x00;
// Pin0: Input
// Pin1: Input
// Pin2: Input
// Pin3: Input
// Pin4: Input
// Pin5: Input
// Pin6: Input
// Pin7: Input
PORTB.DIR=0x00;
// Pin0 Output/Pull configuration: Totempole/No
// Pin0 Input/Sense configuration: Sense both edges
// Pin0 Inverted: Off
// Pin0 Slew Rate Limitation: Off
PORTB.PIN0CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin1 Output/Pull configuration: Totempole/No
// Pin1 Input/Sense configuration: Sense both edges
// Pin1 Inverted: Off
// Pin1 Slew Rate Limitation: Off
PORTB.PIN1CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin2 Output/Pull configuration: Totempole/No
// Pin2 Input/Sense configuration: Sense both edges
// Pin2 Inverted: Off
// Pin2 Slew Rate Limitation: Off
PORTB.PIN2CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin3 Output/Pull configuration: Totempole/No
// Pin3 Input/Sense configuration: Sense both edges
// Pin3 Inverted: Off
// Pin3 Slew Rate Limitation: Off
PORTB.PIN3CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin4 Output/Pull configuration: Totempole/No
// Pin4 Input/Sense configuration: Sense both edges
// Pin4 Inverted: Off
// Pin4 Slew Rate Limitation: Off
PORTB.PIN4CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin5 Output/Pull configuration: Totempole/No
// Pin5 Input/Sense configuration: Sense both edges
// Pin5 Inverted: Off
// Pin5 Slew Rate Limitation: Off
PORTB.PIN5CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin6 Output/Pull configuration: Totempole/No
// Pin6 Input/Sense configuration: Sense both edges
// Pin6 Inverted: Off
// Pin6 Slew Rate Limitation: Off
PORTB.PIN6CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin7 Output/Pull configuration: Totempole/No
// Pin7 Input/Sense configuration: Sense both edges
// Pin7 Inverted: Off
// Pin7 Slew Rate Limitation: Off
PORTB.PIN7CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Interrupt 0 level: Disabled
// Interrupt 1 level: Disabled
PORTB.INTCTRL=(PORTB.INTCTRL & (~(PORT_INT1LVL_gm | PORT_INT0LVL_gm))) |
	PORT_INT1LVL_OFF_gc | PORT_INT0LVL_OFF_gc;
// Pin0 Pin Change interrupt 0: Off
// Pin1 Pin Change interrupt 0: Off
// Pin2 Pin Change interrupt 0: Off
// Pin3 Pin Change interrupt 0: Off
// Pin4 Pin Change interrupt 0: Off
// Pin5 Pin Change interrupt 0: Off
// Pin6 Pin Change interrupt 0: Off
// Pin7 Pin Change interrupt 0: Off
PORTB.INT0MASK=0x00;
// Pin0 Pin Change interrupt 1: Off
// Pin1 Pin Change interrupt 1: Off
// Pin2 Pin Change interrupt 1: Off
// Pin3 Pin Change interrupt 1: Off
// Pin4 Pin Change interrupt 1: Off
// Pin5 Pin Change interrupt 1: Off
// Pin6 Pin Change interrupt 1: Off
// Pin7 Pin Change interrupt 1: Off
PORTB.INT1MASK=0x00;

// PORTC initialization
// OUT register
PORTC.OUT=0x00;
// Pin0: Input
// Pin1: Input
// Pin2: Input
// Pin3: Input
// Pin4: Input
// Pin5: Input
// Pin6: Input
// Pin7: Input
PORTC.DIR=0x00;
// Pin0 Output/Pull configuration: Totempole/No
// Pin0 Input/Sense configuration: Sense both edges
// Pin0 Inverted: Off
// Pin0 Slew Rate Limitation: Off
PORTC.PIN0CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin1 Output/Pull configuration: Totempole/No
// Pin1 Input/Sense configuration: Sense both edges
// Pin1 Inverted: Off
// Pin1 Slew Rate Limitation: Off
PORTC.PIN1CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin2 Output/Pull configuration: Totempole/No
// Pin2 Input/Sense configuration: Sense both edges
// Pin2 Inverted: Off
// Pin2 Slew Rate Limitation: Off
PORTC.PIN2CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin3 Output/Pull configuration: Totempole/No
// Pin3 Input/Sense configuration: Sense both edges
// Pin3 Inverted: Off
// Pin3 Slew Rate Limitation: Off
PORTC.PIN3CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin4 Output/Pull configuration: Totempole/No
// Pin4 Input/Sense configuration: Sense both edges
// Pin4 Inverted: Off
// Pin4 Slew Rate Limitation: Off
PORTC.PIN4CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin5 Output/Pull configuration: Totempole/No
// Pin5 Input/Sense configuration: Sense both edges
// Pin5 Inverted: Off
// Pin5 Slew Rate Limitation: Off
PORTC.PIN5CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin6 Output/Pull configuration: Totempole/No
// Pin6 Input/Sense configuration: Sense both edges
// Pin6 Inverted: Off
// Pin6 Slew Rate Limitation: Off
PORTC.PIN6CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin7 Output/Pull configuration: Totempole/No
// Pin7 Input/Sense configuration: Sense both edges
// Pin7 Inverted: Off
// Pin7 Slew Rate Limitation: Off
PORTC.PIN7CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// PORTC Peripheral Output Remapping
// OC0A Output: Pin 0
// OC0B Output: Pin 1
// OC0C Output: Pin 2
// OC0D Output: Pin 3
// USART0 XCK: Pin 1
// USART0 RXD: Pin 2
// USART0 TXD: Pin 3
// SPI MOSI: Pin 5
// SPI SCK: Pin 7
PORTC.REMAP=(0<<PORT_SPI_bp) | (0<<PORT_USART0_bp) | (0<<PORT_TC0D_bp) | (0<<PORT_TC0C_bp) | (0<<PORT_TC0B_bp) | (0<<PORT_TC0A_bp);
// Interrupt 0 level: Disabled
// Interrupt 1 level: Disabled
PORTC.INTCTRL=(PORTC.INTCTRL & (~(PORT_INT1LVL_gm | PORT_INT0LVL_gm))) |
	PORT_INT1LVL_OFF_gc | PORT_INT0LVL_OFF_gc;
// Pin0 Pin Change interrupt 0: Off
// Pin1 Pin Change interrupt 0: Off
// Pin2 Pin Change interrupt 0: Off
// Pin3 Pin Change interrupt 0: Off
// Pin4 Pin Change interrupt 0: Off
// Pin5 Pin Change interrupt 0: Off
// Pin6 Pin Change interrupt 0: Off
// Pin7 Pin Change interrupt 0: Off
PORTC.INT0MASK=0x00;
// Pin0 Pin Change interrupt 1: Off
// Pin1 Pin Change interrupt 1: Off
// Pin2 Pin Change interrupt 1: Off
// Pin3 Pin Change interrupt 1: Off
// Pin4 Pin Change interrupt 1: Off
// Pin5 Pin Change interrupt 1: Off
// Pin6 Pin Change interrupt 1: Off
// Pin7 Pin Change interrupt 1: Off
PORTC.INT1MASK=0x00;

// PORTD initialization
// OUT register
PORTD.OUT=0x00;
// Pin0: Output
// Pin1: Output
// Pin2: Output
// Pin3: Output
// Pin4: Output
// Pin5: Output
// Pin6: Output
// Pin7: Output
PORTD.DIR=0xFF;
// Pin0 Output/Pull configuration: Totempole/No
// Pin0 Input/Sense configuration: Sense both edges
// Pin0 Inverted: Off
// Pin0 Slew Rate Limitation: On
PORTD.PIN0CTRL=PORT_SRLEN_bm | PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin1 Output/Pull configuration: Totempole/No
// Pin1 Input/Sense configuration: Sense both edges
// Pin1 Inverted: Off
// Pin1 Slew Rate Limitation: On
PORTD.PIN1CTRL=PORT_SRLEN_bm | PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin2 Output/Pull configuration: Totempole/No
// Pin2 Input/Sense configuration: Sense both edges
// Pin2 Inverted: Off
// Pin2 Slew Rate Limitation: On
PORTD.PIN2CTRL=PORT_SRLEN_bm | PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin3 Output/Pull configuration: Totempole/No
// Pin3 Input/Sense configuration: Sense both edges
// Pin3 Inverted: Off
// Pin3 Slew Rate Limitation: On
PORTD.PIN3CTRL=PORT_SRLEN_bm | PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin4 Output/Pull configuration: Totempole/No
// Pin4 Input/Sense configuration: Sense both edges
// Pin4 Inverted: Off
// Pin4 Slew Rate Limitation: On
PORTD.PIN4CTRL=PORT_SRLEN_bm | PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin5 Output/Pull configuration: Totempole/No
// Pin5 Input/Sense configuration: Sense both edges
// Pin5 Inverted: Off
// Pin5 Slew Rate Limitation: On
PORTD.PIN5CTRL=PORT_SRLEN_bm | PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin6 Output/Pull configuration: Totempole/No
// Pin6 Input/Sense configuration: Sense both edges
// Pin6 Inverted: Off
// Pin6 Slew Rate Limitation: On
PORTD.PIN6CTRL=PORT_SRLEN_bm | PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin7 Output/Pull configuration: Totempole/No
// Pin7 Input/Sense configuration: Sense both edges
// Pin7 Inverted: Off
// Pin7 Slew Rate Limitation: On
PORTD.PIN7CTRL=PORT_SRLEN_bm | PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Interrupt 0 level: Disabled
// Interrupt 1 level: Disabled
PORTD.INTCTRL=(PORTD.INTCTRL & (~(PORT_INT1LVL_gm | PORT_INT0LVL_gm))) |
	PORT_INT1LVL_OFF_gc | PORT_INT0LVL_OFF_gc;
// Pin0 Pin Change interrupt 0: Off
// Pin1 Pin Change interrupt 0: Off
// Pin2 Pin Change interrupt 0: Off
// Pin3 Pin Change interrupt 0: Off
// Pin4 Pin Change interrupt 0: Off
// Pin5 Pin Change interrupt 0: Off
// Pin6 Pin Change interrupt 0: Off
// Pin7 Pin Change interrupt 0: Off
PORTD.INT0MASK=0x00;
// Pin0 Pin Change interrupt 1: Off
// Pin1 Pin Change interrupt 1: Off
// Pin2 Pin Change interrupt 1: Off
// Pin3 Pin Change interrupt 1: Off
// Pin4 Pin Change interrupt 1: Off
// Pin5 Pin Change interrupt 1: Off
// Pin6 Pin Change interrupt 1: Off
// Pin7 Pin Change interrupt 1: Off
PORTD.INT1MASK=0x00;

// PORTE initialization
// OUT register
PORTE.OUT=0x00;
// Pin0: Input
// Pin1: Input
// Pin2: Input
// Pin3: Input
// Pin4: Input
// Pin5: Input
// Pin6: Input
// Pin7: Input
PORTE.DIR=0x00;
// Pin0 Output/Pull configuration: Totempole/No
// Pin0 Input/Sense configuration: Sense both edges
// Pin0 Inverted: Off
// Pin0 Slew Rate Limitation: Off
PORTE.PIN0CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin1 Output/Pull configuration: Totempole/No
// Pin1 Input/Sense configuration: Sense both edges
// Pin1 Inverted: Off
// Pin1 Slew Rate Limitation: Off
PORTE.PIN1CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin2 Output/Pull configuration: Totempole/No
// Pin2 Input/Sense configuration: Sense both edges
// Pin2 Inverted: Off
// Pin2 Slew Rate Limitation: Off
PORTE.PIN2CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin3 Output/Pull configuration: Totempole/No
// Pin3 Input/Sense configuration: Sense both edges
// Pin3 Inverted: Off
// Pin3 Slew Rate Limitation: Off
PORTE.PIN3CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin4 Output/Pull configuration: Totempole/No
// Pin4 Input/Sense configuration: Sense both edges
// Pin4 Inverted: Off
// Pin4 Slew Rate Limitation: Off
PORTE.PIN4CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin5 Output/Pull configuration: Totempole/No
// Pin5 Input/Sense configuration: Sense both edges
// Pin5 Inverted: Off
// Pin5 Slew Rate Limitation: Off
PORTE.PIN5CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin6 Output/Pull configuration: Totempole/No
// Pin6 Input/Sense configuration: Sense both edges
// Pin6 Inverted: Off
// Pin6 Slew Rate Limitation: Off
PORTE.PIN6CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin7 Output/Pull configuration: Totempole/No
// Pin7 Input/Sense configuration: Sense both edges
// Pin7 Inverted: Off
// Pin7 Slew Rate Limitation: Off
PORTE.PIN7CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Interrupt 0 level: Disabled
// Interrupt 1 level: Disabled
PORTE.INTCTRL=(PORTE.INTCTRL & (~(PORT_INT1LVL_gm | PORT_INT0LVL_gm))) |
	PORT_INT1LVL_OFF_gc | PORT_INT0LVL_OFF_gc;
// Pin0 Pin Change interrupt 0: Off
// Pin1 Pin Change interrupt 0: Off
// Pin2 Pin Change interrupt 0: Off
// Pin3 Pin Change interrupt 0: Off
// Pin4 Pin Change interrupt 0: Off
// Pin5 Pin Change interrupt 0: Off
// Pin6 Pin Change interrupt 0: Off
// Pin7 Pin Change interrupt 0: Off
PORTE.INT0MASK=0x00;
// Pin0 Pin Change interrupt 1: Off
// Pin1 Pin Change interrupt 1: Off
// Pin2 Pin Change interrupt 1: Off
// Pin3 Pin Change interrupt 1: Off
// Pin4 Pin Change interrupt 1: Off
// Pin5 Pin Change interrupt 1: Off
// Pin6 Pin Change interrupt 1: Off
// Pin7 Pin Change interrupt 1: Off
PORTE.INT1MASK=0x00;

// PORTF initialization
// OUT register
PORTF.OUT=0x08;
// Pin0: Input
// Pin1: Input
// Pin2: Input
// Pin3: Output
// Pin4: Input
// Pin5: Input
// Pin6: Input
// Pin7: Input
PORTF.DIR=0x08;
// Pin0 Output/Pull configuration: Totempole/No
// Pin0 Input/Sense configuration: Sense both edges
// Pin0 Inverted: Off
// Pin0 Slew Rate Limitation: Off
PORTF.PIN0CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin1 Output/Pull configuration: Totempole/No
// Pin1 Input/Sense configuration: Sense both edges
// Pin1 Inverted: Off
// Pin1 Slew Rate Limitation: Off
PORTF.PIN1CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin2 Output/Pull configuration: Totempole/No
// Pin2 Input/Sense configuration: Sense both edges
// Pin2 Inverted: Off
// Pin2 Slew Rate Limitation: Off
PORTF.PIN2CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin3 Output/Pull configuration: Totempole/No
// Pin3 Input/Sense configuration: Sense both edges
// Pin3 Inverted: Off
// Pin3 Slew Rate Limitation: Off
PORTF.PIN3CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin4 Output/Pull configuration: Totempole/No
// Pin4 Input/Sense configuration: Sense both edges
// Pin4 Inverted: Off
// Pin4 Slew Rate Limitation: Off
PORTF.PIN4CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin5 Output/Pull configuration: Totempole/No
// Pin5 Input/Sense configuration: Sense both edges
// Pin5 Inverted: Off
// Pin5 Slew Rate Limitation: Off
PORTF.PIN5CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin6 Output/Pull configuration: Totempole/No
// Pin6 Input/Sense configuration: Sense both edges
// Pin6 Inverted: Off
// Pin6 Slew Rate Limitation: Off
PORTF.PIN6CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin7 Output/Pull configuration: Totempole/No
// Pin7 Input/Sense configuration: Sense both edges
// Pin7 Inverted: Off
// Pin7 Slew Rate Limitation: Off
PORTF.PIN7CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Interrupt 0 level: Disabled
// Interrupt 1 level: Disabled
PORTF.INTCTRL=(PORTF.INTCTRL & (~(PORT_INT1LVL_gm | PORT_INT0LVL_gm))) |
	PORT_INT1LVL_OFF_gc | PORT_INT0LVL_OFF_gc;
// Pin0 Pin Change interrupt 0: Off
// Pin1 Pin Change interrupt 0: Off
// Pin2 Pin Change interrupt 0: Off
// Pin3 Pin Change interrupt 0: Off
// Pin4 Pin Change interrupt 0: Off
// Pin5 Pin Change interrupt 0: Off
// Pin6 Pin Change interrupt 0: Off
// Pin7 Pin Change interrupt 0: Off
PORTF.INT0MASK=0x00;
// Pin0 Pin Change interrupt 1: Off
// Pin1 Pin Change interrupt 1: Off
// Pin2 Pin Change interrupt 1: Off
// Pin3 Pin Change interrupt 1: Off
// Pin4 Pin Change interrupt 1: Off
// Pin5 Pin Change interrupt 1: Off
// Pin6 Pin Change interrupt 1: Off
// Pin7 Pin Change interrupt 1: Off
PORTF.INT1MASK=0x00;

// PORTR initialization
// OUT register
PORTR.OUT=0x00;
// Pin0: Input
// Pin1: Input
PORTR.DIR=0x00;
// Pin0 Output/Pull configuration: Totempole/No
// Pin0 Input/Sense configuration: Sense both edges
// Pin0 Inverted: Off
// Pin0 Slew Rate Limitation: Off
PORTR.PIN0CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Pin1 Output/Pull configuration: Totempole/No
// Pin1 Input/Sense configuration: Sense both edges
// Pin1 Inverted: Off
// Pin1 Slew Rate Limitation: Off
PORTR.PIN1CTRL=PORT_OPC_TOTEM_gc | PORT_ISC_BOTHEDGES_gc;
// Interrupt 0 level: Disabled
// Interrupt 1 level: Disabled
PORTR.INTCTRL=(PORTR.INTCTRL & (~(PORT_INT1LVL_gm | PORT_INT0LVL_gm))) |
	PORT_INT1LVL_OFF_gc | PORT_INT0LVL_OFF_gc;
// Pin0 Pin Change interrupt 0: Off
// Pin1 Pin Change interrupt 0: Off
PORTR.INT0MASK=0x00;
// Pin0 Pin Change interrupt 1: Off
// Pin1 Pin Change interrupt 1: Off
PORTR.INT1MASK=0x00;
}

// Virtual Ports initialization
void vports_init(void)
{
// PORTA mapped to VPORT0
// PORTB mapped to VPORT1
PORTCFG.VPCTRLA=PORTCFG_VP13MAP_PORTB_gc | PORTCFG_VP02MAP_PORTA_gc;
// PORTC mapped to VPORT2
// PORTD mapped to VPORT3
PORTCFG.VPCTRLB=PORTCFG_VP13MAP_PORTD_gc | PORTCFG_VP02MAP_PORTC_gc;
}

// Disable a Timer/Counter type TC0
void tc0_disable(TC0_t *ptc)
{
// Timer/Counter off
ptc->CTRLA=TC_CLKSEL_OFF_gc;
// Issue a reset command
ptc->CTRLFSET=TC_CMD_RESET_gc;
}

// Timer/Counter TCC0 initialization
void tcc0_init(void)
{
unsigned char s;
unsigned char n;

// Note: The correct PORTC direction for the Compare Channels
// outputs is configured in the ports_init function.

// Save interrupts enabled/disabled state
s=SREG;
// Disable interrupts
#asm("cli")

// Disable and reset the timer/counter just to be sure
tc0_disable(&TCC0);
// Clock source: ClkPer/1
TCC0.CTRLA=TC_CLKSEL_DIV1_gc;
// Mode: Normal Operation, Overflow Int./Event on TOP
// Compare/Capture on channel A: Off
// Compare/Capture on channel B: Off
// Compare/Capture on channel C: Off
// Compare/Capture on channel D: Off
TCC0.CTRLB=(0<<TC0_CCDEN_bp) | (0<<TC0_CCCEN_bp) | (0<<TC0_CCBEN_bp) | (0<<TC0_CCAEN_bp) |
	TC_WGMODE_NORMAL_gc;
// Capture event source: None
// Capture event action: None
TCC0.CTRLD=TC_EVACT_OFF_gc | TC_EVSEL_OFF_gc;

// Set Timer/Counter in Normal mode
TCC0.CTRLE=TC_BYTEM_NORMAL_gc;

// Overflow interrupt: High Level
// Error interrupt: Disabled
TCC0.INTCTRLA=TC_ERRINTLVL_OFF_gc | TC_OVFINTLVL_HI_gc;

// Compare/Capture channel A interrupt: Disabled
// Compare/Capture channel B interrupt: Disabled
// Compare/Capture channel C interrupt: Disabled
// Compare/Capture channel D interrupt: Disabled
TCC0.INTCTRLB=TC_CCDINTLVL_OFF_gc | TC_CCCINTLVL_OFF_gc | TC_CCBINTLVL_OFF_gc | TC_CCAINTLVL_OFF_gc;

// High resolution extension: Off
HIRESC.CTRLA&= ~HIRES_HREN0_bm;

// Advanced Waveform Extension initialization
// Optimize for speed
#pragma optsize- 
// Disable locking the AWEX configuration registers just to be sure
n=MCU.AWEXLOCK & (~MCU_AWEXCLOCK_bm);
CCP=CCP_IOREG_gc;
MCU.AWEXLOCK=n;
// Restore optimization for size if needed
#pragma optsize_default

// Pattern generation: Off
// Dead time insertion: Off
AWEXC.CTRL=(0<<AWEX_PGM_bp) | (0<<AWEX_CWCM_bp) | (0<<AWEX_DTICCDEN_bp) | (0<<AWEX_DTICCCEN_bp) | 
	(0<<AWEX_DTICCBEN_bp) | (0<<AWEX_DTICCAEN_bp);

// Fault protection initialization
// Fault detection on OCD Break detection: On
// Fault detection restart mode: Latched Mode
// Fault detection action: None (Fault protection disabled)
AWEXC.FDCTRL=(AWEXC.FDCTRL & (~(AWEX_FDDBD_bm | AWEX_FDMODE_bm | AWEX_FDACT_gm))) |
	(0<<AWEX_FDDBD_bp) | (0<<AWEX_FDMODE_bp) | AWEX_FDACT_NONE_gc;
// Fault detect events: 
// Event channel 0: Off
// Event channel 1: Off
// Event channel 2: Off
// Event channel 3: Off
// Event channel 4: Off
// Event channel 5: Off
// Event channel 6: Off
// Event channel 7: Off
AWEXC.FDEMASK=0b00000000;
// Make sure the fault detect flag is cleared
AWEXC.STATUS|=AWEXC.STATUS & AWEX_FDF_bm;

// Clear the interrupt flags
TCC0.INTFLAGS=TCC0.INTFLAGS;
// Set Counter register
TCC0.CNT=0x0000;
// Set Period register
TCC0.PER=0x016A;//0x01B2;
// Set channel A Compare/Capture register
TCC0.CCA=0x0000;
// Set channel B Compare/Capture register
TCC0.CCB=0x0000;
// Set channel C Compare/Capture register
TCC0.CCC=0x0000;
// Set channel D Compare/Capture register
TCC0.CCD=0x0000;

// Restore interrupts enabled/disabled state
SREG=s;
}

// USARTF0 initialization
void usartf0_init(void)
{
// Note: The correct PORTF direction for the RxD, TxD and XCK signals
// is configured in the ports_init function.

// Transmitter is enabled
// Set TxD=1
PORTF.OUTSET=0x08;

// Communication mode: Asynchronous USART
// Data bits: 8
// Stop bits: 1
// Parity: Disabled
USARTF0.CTRLC=USART_CMODE_ASYNCHRONOUS_gc | USART_PMODE_DISABLED_gc | USART_CHSIZE_8BIT_gc;

// Receive complete interrupt: Disabled
// Transmit complete interrupt: Disabled
// Data register empty interrupt: Disabled
USARTF0.CTRLA=(USARTF0.CTRLA & (~(USART_RXCINTLVL_gm | USART_TXCINTLVL_gm | USART_DREINTLVL_gm))) |
	USART_RXCINTLVL_OFF_gc | USART_TXCINTLVL_OFF_gc | USART_DREINTLVL_OFF_gc;

// Required Baud rate: 2000000
// Real Baud Rate: 2000000,0 (x2 Mode), Error: 0,0 %
USARTF0.BAUDCTRLA=0x00;
USARTF0.BAUDCTRLB=((0x09 << USART_BSCALE_gp) & USART_BSCALE_gm) | 0x00;

// Receiver: On
// Transmitter: On
// Double transmission speed mode: On
// Multi-processor communication mode: Off
USARTF0.CTRLB=(USARTF0.CTRLB & (~(USART_RXEN_bm | USART_TXEN_bm | USART_CLK2X_bm | USART_MPCM_bm | USART_TXB8_bm))) |
	USART_RXEN_bm | USART_TXEN_bm | USART_CLK2X_bm;
}

// Receive a character from USARTF0
#pragma used+
char getchar_usartf0(void)
{
char data;
unsigned char status;

while (1)
      {
      while (((status=USARTF0.STATUS) & USART_RXCIF_bm) == 0);
      data=USARTF0.DATA;
      if ((status & (USART_FERR_bm | USART_PERR_bm | USART_BUFOVF_bm)) == 0) return data;
      }
}
#pragma used-

// Write a character to the USARTF0 Transmitter
#pragma used+
void putchar_usartf0(char c)
{
while ((USARTF0.STATUS & USART_DREIF_bm) == 0);
USARTF0.DATA=c;
}
#pragma used-

// DACB initialization
void dacb_init(void)
{
// Operating mode: Single Channel (Ch0)
// Channel 0 triggered by the event system: Off
DACB.CTRLB=(DACB.CTRLB & (~(DAC_CHSEL_gm | DAC_CH0TRIG_bm | DAC_CH1TRIG_bm))) |
	DAC_CHSEL_SINGLE_gc;

// Reference: AVcc
// Left adjust value: Off
DACB.CTRLC=(DACB.CTRLC & (~(DAC_REFSEL_gm | DAC_LEFTADJ_bm))) |
	DAC_REFSEL_AVCC_gc;

// DACB is enabled
// Low power mode: Off
// Channel 0 output: On
// Channel 1 output: Off
// Internal output connected to the ADCB and Analog Comparator MUX-es: Off
DACB.CTRLA=(DACB.CTRLA & (~(DAC_IDOEN_bm | DAC_CH0EN_bm | DAC_CH1EN_bm | DAC_LPMODE_bm))) |
	DAC_CH0EN_bm | DAC_ENABLE_bm;
}

// Function used to write data to a DACB channel ch
void dacb_write(unsigned char ch, unsigned int data)
{
register unsigned char m=ch ? DAC_CH1DRE_bm : DAC_CH0DRE_bm;
// Wait for the channel data register to be ready for new data
while ((DACB.STATUS & m)==0);
// Write new data to the channel data register
if (m==DAC_CH1DRE_bm) DACB.CH1DATA=data;
else DACB.CH0DATA=data;
}



// Timer/counter TCC0 Overflow/Underflow interrupt service routine
interrupt [TCC0_OVF_vect] void tcc0_overflow_isr(void)
{
    //PORTD.OUT=~PORTD.OUT;
   if (rAdr!=wAdr)
   {     
        PORTD.OUT=fifo[rAdr++];
        //DACB.CH0DATA=fifo[rAdr++]<<4;
        
     //   PORTE.OUT=0;
   }
   //else
  //  PORTE.OUT=1;
   if (fSIZE==rAdr) rAdr=0;
   if (!needdata)
   {
       if (rAdr<=wAdr)
           if (wAdr-rAdr<6000)
           {
            putchar_usartf0(0xFF);
            needdata=1;
           }
           else;
           else if (rAdr-wAdr>6000)
           {
            putchar_usartf0(0xFF);
            needdata=1;
           }
   }
   else
   {
    if (dn++>2000)
    {
    putchar_usartf0(0xFF);
    dn=0;
    }
   }
}





void main(void)
{
// Declare your local variables here
unsigned char n;

// Interrupt system initialization
// Optimize for speed
#pragma optsize-
// Make sure the interrupts are disabled
#asm("cli")
// Low level interrupt: Off
// Round-robin scheduling for low level interrupt: Off
// Medium level interrupt: Off
// High level interrupt: On
// The interrupt vectors will be placed at the start of the Application FLASH section
n=(PMIC.CTRL & (~(PMIC_RREN_bm | PMIC_IVSEL_bm | PMIC_HILVLEN_bm | PMIC_MEDLVLEN_bm | PMIC_LOLVLEN_bm))) |
    PMIC_HILVLEN_bm;
CCP=CCP_IOREG_gc;
PMIC.CTRL=n;
// Set the default priority for round-robin scheduling
PMIC.INTPRI=0x00;
// Restore optimization for size if needed
#pragma optsize_default

// System clocks initialization
system_clocks_init();

// Ports initialization
ports_init();

// Virtual Ports initialization
vports_init();

// DACB initialization
dacb_init();


// Timer/Counter TCC0 initialization
tcc0_init();

// USARTF0 initialization
usartf0_init();



// Globally enable interrupts
#asm("sei")
rAdr=0;
wAdr=0;
PORTD.OUT=0xFF;
 needdata=0;
while (1)
      {
        fifo[wAdr++]=getchar_usartf0();
        if (fSIZE==wAdr) wAdr=0;
      }
}


PC程序代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
using System.Text.RegularExpressions;
using System.Globalization;
using System.IO.Ports;

namespace bol
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        byte[] byData;
        int k = 0;

        private void Form1_Shown(object sender, EventArgs e)
        {
            string[] ports = SerialPort.GetPortNames();
            comboBox1.Items.AddRange(SerialPort.GetPortNames());
            if (comboBox1.Items.Count > -1)
            {
                comboBox1.SelectedIndex = 0;
            }

        }

        private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            if (serialPort1.IsOpen)
                {
                if (byData.Length - 2000 > k)
                {
                    serialPort1.Write(byData, k, 2000);
                    k += 2000;
                }
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            serialPort1.Close();
            button1.Enabled = true;
            try
            {
                serialPort1.BaudRate = Convert.ToInt32(textBox1.Text);
            }
            catch
            {
                MessageBox.Show("!!!!!!"); return;
            }

            if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                string fileNam = openFileDialog1.FileName;
                FileStream fs = new FileStream(fileNam, FileMode.OpenOrCreate, FileAccess.Read);
                int len = Convert.ToInt32(fs.Length);
                byData = new byte[len];   //  
                try
                {   //  ,   (  )   
                    fs.Read(byData, 44, len - 44 - 1);
                    fs.Dispose(); //  
                   
                }
                catch (IOException err)
                {
                    MessageBox.Show(err.Message); return;
                }
                serialPort1.Open();
                k = 0;
                if (byData.Length - 2000 > k)
                {
                    serialPort1.Write(byData, k, 2000);
                    k += 2000;
                }
            }
        }


        private void comboBox1_TextChanged(object sender, EventArgs e)
        {
            serialPort1.PortName = comboBox1.Text;
        }

        private void button3_Click(object sender, EventArgs e)
        {
            k = 0;
        }

        private void button1_Click_1(object sender, EventArgs e)
        {
            if (serialPort1.IsOpen)
            {
                serialPort1.Close();
            }
            else serialPort1.Open();
        }
    }
}

Source: https://habr.com/ru/post/zh-CN392585/


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