TTL串口转PAL视频信号_ATmega8@16MHz.rar

/********************************************************************** * * IDE : ATmanAVR(GCC) * MCU : Atmeage8 @16MHz * mail : Shushikuan * ROM : 2414 bytes * RAM : 460 bytes * DATE : 2019-02-25 * FUNC : serial port to TV PAL * ************************************************************************/ /*********************************************************************** * * 1N4148 330 R * | _______ * MOSI(PB3) |------|>------|_______|------ * | | * | 1K | * | 1N4148 _______ | * OC1A(PB1) |------|>------|_______|------+--------------> PAL Output * | | * | | * | - * -------------- | | * ATMega8 @16MHz | | 75 R * | | * |_| * | * | * | * ----- * --- * - * ************************************************************************/ #include "AVRTV.h" #include <util/delay.h> #include <avr/io.h> #include <avr/pgmspace.h> #include "font_8x16.h" //AVRTV // 38 2.375 uS // 75 4.7uS // 437 27.3uS // 474 29.65 uS // 512 32 uS // 1024 64 uS #define PW2350 37 #define PW4700 74 #define PW2730 436 #define PW2965 473 #define PW3200 511 #define PW6400 1023 #define CHAR_ROWS 13 #define CHAR_COLS 32 #define START_LINE 75 #define END_LINE 282 // START_LINE + CHAR_ROWS * 16 -1 #define FONT_HEIGHT 16 #define RECV_BUFF_SIZE 200 unsigned short scan_line = 1; unsigned char char_buff[CHAR_ROWS][CHAR_COLS]; // 13 行 x 32 列个字符 unsigned char recv_buff[RECV_BUFF_SIZE]; unsigned char recv_len=0; unsigned short text_cursor_pos =0; // void ShowText(char row,char col,char * pStr) // { // unsigned char i=0,x,y; // while(*pStr) // { // x=row+(col+i)/CHAR_COLS; // y=(col+i) % CHAR_COLS; // char_buff[x][y] = *pStr++; // i++; // } // // } void ShowText(char row,char col,char * pStr) { unsigned char i=0,x,y; unsigned char m,n; while(*pStr) { if(*pStr==0x0D && *(pStr+1) == 0x0A){ text_cursor_pos = (text_cursor_pos /CHAR_COLS+1)*CHAR_COLS; break; }else{ x=row+(col+i)/CHAR_COLS; y=(col+i) % CHAR_COLS; char_buff[x][y] = *pStr++;i++; text_cursor_pos = row * CHAR_COLS + y+1; if(text_cursor_pos>= CHAR_ROWS * CHAR_COLS ) { for(m=1;m<CHAR_ROWS;m++) for(n=0;n<CHAR_COLS;n++) char_buff[m-1][n] = char_buff[m][n]; for(n=0;n<CHAR_COLS;n++) char_buff[m][n] = 32; text_cursor_pos = (CHAR_ROWS-1) * CHAR_COLS; } } } } void PutText(unsigned char * buff,short len) { short i,m,n,x,y; for(i=0;i<len;i++) { if(buff[i]==0x0D && buff[i+1] == 0x0A){ text_cursor_pos = (text_cursor_pos /CHAR_COLS+1)*CHAR_COLS; break; }else if(buff[i]>=32 && buff[i] <=126){ if(text_cursor_pos>= CHAR_ROWS * CHAR_COLS ) { for(m=1;m<CHAR_ROWS;m++)for(n=0;n<CHAR_COLS;n++)char_buff[m-1][n] = char_buff[m][n]; for(n=0;n<CHAR_COLS;n++)char_buff[CHAR_ROWS-1][n] = 32; text_cursor_pos = (CHAR_ROWS-1) * CHAR_COLS; } x = text_cursor_pos / CHAR_COLS; y = text_cursor_pos % CHAR_COLS; char_buff[x][y] = buff[i]; text_cursor_pos ++; } } } // 9600,n,8,1 void USART_Init(void) { //ubrr = fosc/(16*baud)-1; //baud = fosc/(16 * (ubrr+1)); UBRRH = 0x00; UBRRL = 103; //波特率9600 , 103 = 16000000 / (16*9600) -1 UCSRA = 0x00; //不使用倍速 UCSRB = 0x98; // 接收器与发送器使能,接收中断使能 UCSRC = 0x86; // 设置帧格式: 8 个数据位, 1个停止位 } static void spi_init(void) { DDRB = 0x2E; PORTB = 0x00; SPCR=0X54; //SPI主机、高位在先、4分频、SPI模式1 SPSR |=0X01; //倍频 } static void timer1_init(void) { // 16-bit timer. // FastPWM with ICR1=TOP. // Inverting PWM on OC1A // // ___________________ _ 1 // |____| | _ // ^ ^ 0 //Bottom OC1A ICR1 //CPU 20MHz //使用定时器1 (16位) 工作在快速PWM模式。 //定时器1从0 计数到 ICR1中设定的值。 //定时器1中的值与OCR1A相等时 ， OCR1A切换为高电平 ，定时器1溢出时，OCR1A引脚为低电平； //WGM1 = 14 , 0b 1110 ICR1 = 511; // 511 --- 32 uS , 1023 --- 64 uS TCNT1 = 0; TIMSK |= 1<<OCIE1A; //TIMSK |= 1<<TOIE1; TCCR1A = ( ( 1 << COM1A1 ) | ( 1 << COM1A0 ) | ( 1 << WGM11 ) | ( 0 << WGM10 ) ) ; TCCR1B = ( ( 1 << WGM13 ) | ( 1 << WGM12 ) | ( 1 << CS10 ) ) ; } void inline mydelay(void) { volatile unsigned short i,j; for(i=0;i<50;i++) for(j=0;j<100;j++); } int main(void) { unsigned char i,j; unsigned rxlen=0; DDRD = 0xFE; PORTD =0x81; for(i=0;i<CHAR_ROWS;i++) for(j=0;j<CHAR_COLS;j++)char_buff[i][j]=32; for(i=0;i<RECV_BUFF_SIZE;i++)recv_buff[i]=0; ShowText(0,0," [ AVR PAL ] "); ShowText(1,0," "); ShowText(2,0,"Shushikuan@163.com"); ShowText(3,0,"2019-02-25\r\n"); USART_Init(); spi_init(); timer1_init(); sei(); while(1) { mydelay(); if(rxlen==recv_len && recv_len !=0) { PutText(recv_buff,recv_len); for(i=0;i<RECV_BUFF_SIZE;i++)recv_buff[i]=0x00; rxlen =0; recv_len =0; }else{ rxlen=recv_len; } } } ISR(SIG_UART_RECV) { recv_buff[recv_len++] = UDR; if(recv_len>=RECV_BUFF_SIZE)recv_len =0; } // //////////////////////////////////////////////////////////////////////////////////// // // 此中断函数产生PAL波形 // //////////////////////////////////////////////////////////////////////////////////// // // 16-bit timer. // // FastPWM with ICR1=TOP. // // Inverting PWM on OC1A // // // // ___________________ _ 1 // // |____| | _ // // ^ ^ 0 // //Bottom OC1A ICR1 // // //CPU 16MHz // //使用定时器1 (16位) 工作在快速PWM模式。 // //定时器1从0 计数到 ICR1中设定的值。 // //定时器1中的值与OCR1A相等时 ， OCR1A切换为高电平 ，定时器1溢出时，OCR1A引脚为低电平； // //WGM1 = 14 , 0b 1110 // // //因为PAL波形对时序要求十分严格 // //所以此中断函数语语句的执行顺序不要随意更改 ISR( TIMER1_COMPA_vect ) { unsigned char row; unsigned char col; unsigned char line; //volatile unsigned char temp;temp=0; //消耗CPU时间达到延时的目的 scan_line++;if(scan_line >= 320)scan_line=1; if(scan_line >= 10 && scan_line <= 313){ ICR1 = PW6400; OCR1A = PW4700; if(scan_line >= START_LINE && scan_line <= END_LINE) { row = (scan_line -START_LINE)/FONT_HEIGHT; line = (scan_line -START_LINE)%FONT_HEIGHT; _delay_us(2.5); for (col = 0;col < CHAR_COLS;col++) { SPDR = pgm_read_byte(&font8x16[char_buff[row][col]-32][line]); } } return; } if(scan_line == 314) {ICR1 = PW6400; OCR1A = PW2350; return;} if(scan_line >= 5 && scan_line <= 8 ) {ICR1 = PW3200; OCR1A = PW2350; return;} if(scan_line >= 315 && scan_line <= 318) {ICR1 = PW3200; OCR1A = PW2350; return;} if(scan_line == 319) {ICR1 = PW3200; OCR1A = PW2730; return;} if(scan_line >= 1 && scan_line <= 4) {ICR1 = PW3200; OCR1A = PW2730; return;} if(scan_line == 9 ) {ICR1 = PW3200; OCR1A = PW4700; return;} }