Микроконтроллеры AVR

вот кусок для LCD, может, пригодится (под ардуину): lcd_setup - инициализация, lcd_refresh - асинхронное обновление буфера (вызывать с частотой >100Гц), lcd_wr_XX, lcd_fill - запись в буфер в разных форматах. ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// //LCD ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// #define LCD_ROWS 2 #define LCD_COLS 8 u8 lcd_buf[LCD_ROWS * LCD_COLS]; enum {LCD_D4=A3, LCD_D5=A2, LCD_D6=A5, LCD_D7=A4, LCD_RS=A1, LCD_E=13}; const u8 led_pins[] = {LCD_D4, LCD_D5, LCD_D6, LCD_D7, LCD_RS, LCD_E}; //set data bus void lcd_d(u8 d) { digitalWrite(LCD_D4, !!(d & 1)); digitalWrite(LCD_D5, !!(d & 2)); digitalWrite(LCD_D6, !!(d & 4)); digitalWrite(LCD_D7, !!(d & 8)); } //set RS void lcd_rs(u8 rs) {digitalWrite(LCD_RS, !!rs);} //set E void lcd_e(u8 e) {digitalWrite(LCD_E, !!e);} //write 4 bits void lcd_d4(u8 d, u8 rs) { lcd_rs(rs); lcd_d(d); delayMicroseconds(10); lcd_e(1); delayMicroseconds(50); lcd_e(0); delayMicroseconds(10); } //write 8 bits void lcd_d8(u8 d, u8 rs) { lcd_d4(d >> 4, rs); lcd_d4(d, rs); } //write command void lcd_cmd(u8 cmd) { lcd_d8(cmd, 0); } //setup void lcd_setup() { memset(&lcd_buf, ' ', sizeof(lcd_buf)); for (u8 lp=0; lp<sizeof(led_pins); lp++) { pinMode(led_pins[lp], OUTPUT); digitalWrite(led_pins[lp], LOW); } delay(20); lcd_d4(3,0); delay(10); lcd_d4(3,0); delay(10); lcd_d4(3,0); delay(10); lcd_d4(2,0); delay(10); lcd_cmd(0x20 | (((LCD_ROWS & 1) + 1) << 3)); lcd_cmd(0x08); lcd_cmd(0x0C); lcd_cmd(0x01); delay(10); lcd_cmd(0x06); } volatile u8 lcd_row,lcd_col; //current row,column //refresh LCD buffer void lcd_refresh() { if (lcd_col == 0) { lcd_cmd(0x80 + ((lcd_row & 1) ? 0x40 : 0) + ((lcd_row & 2) ? LCD_COLS : 0) ); } lcd_d8(lcd_buf[lcd_row * LCD_COLS + lcd_col], 1); if (++lcd_col >= LCD_COLS) { lcd_col = 0; if (++lcd_row >= LCD_ROWS) lcd_row = 0; } } //write char to LCD buffer inline void lcd_wr_c(u8 pos, char c) { lcd_buf[pos] = c; } //fill buffer in LCD buffer inline void lcd_fill(u8 pos, u8 w, char c) { memset( &lcd_buf[pos], c, w ); } //write string to LCD buffer void lcd_wr_s(u8 pos, const char *s) { u8 *buf = &lcd_buf[pos]; while (*s != 0) *buf++ = *s++; } //convert binary 0..15 to HEX char u8 lcd_b2h(u8 b) { return (b <= 9) ? (b + '0') : (b + 'A' - 10); } //write 4-bit HEX void lcd_wr_h4(u8 pos, u8 b) { lcd_buf[pos] = lcd_b2h(b & 0xF); } //write 8-bit HEX void lcd_wr_h8(u8 pos, u8 b) { lcd_wr_h4(pos, b); lcd_wr_h4(pos-1, b >> 4); } //write 16-bit HEX void lcd_wr_h16(u8 pos, u16 w) { lcd_wr_h8(pos, w); lcd_wr_h8(pos-2, w >> 8); } //write 24-bit HEX void lcd_wr_h24(u8 pos, u32 w) { lcd_wr_h16(pos, w); lcd_wr_h8(pos-4, w >> 16); } //write 32-bit HEX void lcd_wr_h32(u8 pos, u32 w) { lcd_wr_h16(pos, w); lcd_wr_h16(pos-4, w >> 16); } //write 32-bit signed decimal n to buffer pos, width w, and point position p void lcd_wr_s32(u8 pos, s32 n, u8 w, u8 p) { u8 dp = 0; u8 s = 0; if (n < 0) { n = -n; s = 1; } if (p) w--; while (w--) { if (p && (p == dp)) lcd_buf[pos--] = '.'; if ((dp == 0)||(n > 0)) lcd_buf[pos] = lcd_b2h(n % 10); else { if (s) { lcd_buf[pos] = '-'; s = 0; } else lcd_buf[pos] = ' '; } n /= 10; pos--; dp++; } }