Christian Kroll
10 years ago
5 changed files with 214 additions and 2 deletions
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#include "../config.h" |
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#include "../makros.h" |
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#include <avr/interrupt.h> |
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#include <avr/io.h> |
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#include <avr/wdt.h> |
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#include "borg_hw.h" |
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#if defined(__AVR_ATmega48__) || \ |
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defined(__AVR_ATmega48P__) || \ |
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defined(__AVR_ATmega88__) || \ |
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defined(__AVR_ATmega88P__) || \ |
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defined(__AVR_ATmega168__) || \ |
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defined(__AVR_ATmega168P__) || \ |
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defined(__AVR_ATmega328__) || \ |
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defined(__AVR_ATmega328P__) |
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# define TIMER0_OFF() TCCR0A = 0; TCCR0B = 0 |
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# define TIMER0_MODE_CS256() TCCR0A = _BV(WGM01); TCCR0B = _BV(CS02) |
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# define TIMER0_RESET() TCNT0 = 0 |
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# define TIMER0_COMPARE(t) OCR0A = t |
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# define TIMER0_INT_ENABLE() TIMSK0 = _BV(OCIE0A) |
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# define TIMER0_ISR TIMER0_COMPA_vect |
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#else // ATmega8
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# define TIMER0_OFF() TCCR0 = 0 |
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# define TIMER0_MODE_CS256() TCCR0 = _BV(CS02) |
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# define TIMER0_RESET() TCNT0 = 0 |
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# define TIMER0_COMPARE(t) TCNT0 = (0xff - t) |
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# define TIMER0_INT_ENABLE() TIMSK = _BV(TOIE0) |
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# define TIMER0_ISR TIMER0_OVF_vect |
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#endif |
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/* Output data of the current row to the column drivers:
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* Column: 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 |
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* Pin: PD2 PD3 PC5 PC4 PC3 PC2 PC1 PC0 PD7 PD6 PB5 PB4 PB3 PB2 PB1 PB0 |
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*/ |
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#define DISPLAY_PINS_B (_BV(PB5)|_BV(PB4)|_BV(PB3)|_BV(PB2)|_BV(PB1)|_BV(PB0)) |
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#define DISPLAY_PINS_C (_BV(PC5)|_BV(PC4)|_BV(PC3)|_BV(PC2)|_BV(PC1)|_BV(PC0)) |
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#define DISPLAY_PINS_D (_BV(PD7)|_BV(PD6)|_BV(PD3)|_BV(PD2)) |
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#define ROW_DUMMY_PORT PORTB |
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#define ROW_DUMMY_DDR DDRB |
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#define ROW_DUMMY_PIN PB7 |
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#define ROW_LED_PORT PORTD |
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#define ROW_LED_DDR DDRD |
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#define ROW_LED_PIN PD5 |
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// buffer which holds the currently shown frame
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unsigned char pixmap[NUMPLANE][NUM_ROWS][LINEBYTES]; |
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// switch to next row
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static void nextrow(uint8_t row) { |
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// switch off all columns for now
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PORTB &= ~(DISPLAY_PINS_B); |
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PORTC &= ~(DISPLAY_PINS_C); |
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PORTD &= ~(DISPLAY_PINS_D); |
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// short delay loop, to ensure proper deactivation of the drivers
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unsigned char i; |
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for (i = 0; i < 10; i++) { |
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asm volatile("nop"); |
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} |
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if (row == LED_TESTER_DISPLAYED_ROW) { |
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// configured row: unblock LED MOSFET, block resistor MOSFET
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ROW_DUMMY_PORT &= ~_BV(ROW_DUMMY_PIN); // block resistor MOSFET
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ROW_LED_PORT |= _BV(ROW_LED_PIN); // unblock LED MOSFET
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} else { /* fake rows simulated by resistors */ |
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// remaining rows: unblock resistor MOSFET, block LED MOSFET
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ROW_LED_PORT &= ~_BV(ROW_LED_PIN); // block LED MOSFET
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ROW_DUMMY_PORT |= _BV(ROW_DUMMY_PIN); // block resistor MOSFET
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} |
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// another delay loop, to ensure that the drivers are ready
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for (i = 0; i < 20; i++) { |
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asm volatile("nop"); |
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} |
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} |
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// show a row
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static void rowshow(unsigned char row, unsigned char plane) { |
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// depending on the currently drawn plane, display the row for a specific
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// amount of time
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#ifdef HIGH_CONTRAST |
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static unsigned char const ocr_table[] = {2, 5, 22}; |
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#else |
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static unsigned char const ocr_table[] = {3, 4, 22}; |
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#endif |
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TIMER0_COMPARE(ocr_table[plane]); |
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uint8_t port_b = (PORTB & ~DISPLAY_PINS_B) | (0x3f & pixmap[plane][row][0]); |
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uint8_t port_c = (PORTC & ~DISPLAY_PINS_C) | (0x3f & pixmap[plane][row][1]); |
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uint8_t port_d = (PORTD & ~DISPLAY_PINS_D) | (0xc0 & pixmap[plane][row][0]); |
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if (0x40u & pixmap[plane][row][1]) port_d |= _BV(PD3); |
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if (0x80u & pixmap[plane][row][1]) port_d |= _BV(PD2); |
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PORTB = port_b; |
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PORTC = port_c; |
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PORTD = port_d; |
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} |
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// interrupt handler
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ISR(TIMER0_ISR) { |
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static unsigned char plane = 0; |
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static unsigned char row = 0; |
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// increment both row and plane
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if (++plane == NUMPLANE) { |
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plane = 0; |
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if (++row == NUM_ROWS) { |
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// reset watchdog
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wdt_reset(); |
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row = 0; |
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} |
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nextrow(row); |
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} |
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// output current row according to current plane
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rowshow(row, plane); |
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} |
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// disables timer, causing the watchdog to reset the MCU
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void timer0_off() { |
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cli(); |
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// switch off all columns
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PORTB &= ~(DISPLAY_PINS_B); |
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PORTC &= ~(DISPLAY_PINS_C); |
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PORTD &= ~(DISPLAY_PINS_D); |
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TIMER0_OFF(); |
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sei(); |
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} |
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// initialize timer which triggers the interrupt
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static void timer0_on() { |
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TIMER0_MODE_CS256(); // CTC mode, prescaling conforms to clk/256
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TIMER0_RESET(); // set counter to 0
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TIMER0_COMPARE(20); // compare with this value first
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TIMER0_INT_ENABLE(); // enable Timer/Counter0 Output Compare Match (A) Int.
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} |
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void borg_hw_init() { |
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// switch column and row ports to output mode
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DDRB |= DISPLAY_PINS_B; |
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DDRC |= DISPLAY_PINS_C; |
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DDRD |= DISPLAY_PINS_D; |
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ROW_DUMMY_DDR |= _BV(ROW_DUMMY_PIN); |
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ROW_LED_DDR |= _BV(ROW_LED_PIN); |
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// switch off all columns for now
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PORTB &= ~(DISPLAY_PINS_B); |
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PORTC &= ~(DISPLAY_PINS_C); |
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PORTD &= ~(DISPLAY_PINS_D); |
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// switch off all rows
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ROW_DUMMY_PORT &= ~_BV(ROW_DUMMY_PIN); |
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ROW_LED_PORT &= ~_BV(ROW_LED_PIN); |
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timer0_on(); |
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// activate watchdog timer
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wdt_reset(); |
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wdt_enable(WDTO_15MS); // 15ms watchdog
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} |
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@ -0,0 +1,22 @@ |
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mainmenu_option next_comment |
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comment "LED Tester Setup" |
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bool "Higher Contrast" HIGH_CONTRAST n |
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bool "UART Support" UART_SUPPORT n |
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choice 'Baud Rate' \ |
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"2400 2400 \ |
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4800 4800 \ |
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9600 9600 \ |
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14400 14400 \ |
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19200 19200 \ |
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28800 28800 \ |
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38400 38400 \ |
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57600 57600 \ |
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76800 76800 \ |
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115200 115200" \ |
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'19200' UART_BAUDRATE_SETTING |
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int "Displayed row" LED_TESTER_DISPLAYED_ROW 0 |
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endmenu |
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