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tornado/: use UART in SPI mode to send LED patterns (at 4 Mbps)
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tornado/doc/lclk-1123.png
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tornado/doc/lclk-1123.png
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@ -31,7 +31,7 @@ OBJCOPY = $(AVR_PREFIX)objcopy
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#OBJDUMP = $(AVR_PREFIX)objdump
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SIZE = $(AVR_PREFIX)size
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OBJS = $(NAME).o $(COMMON_OBJS)
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OBJS = $(NAME).o led.o $(COMMON_OBJS)
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BOOT_OBJS = boot.o $(COMMON_OBJS)
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COMMON_OBJS =
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82
tornado/fw/led.c
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82
tornado/fw/led.c
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@ -0,0 +1,82 @@
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/*
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* fw/led.c - LED control
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*
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* Written 2012 by Werner Almesberger
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* Copyright 2012 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdint.h>
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#define F_CPU 8000000UL
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#include <util/delay.h>
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#include "io.h"
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#include "led.h"
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void led_show(const uint8_t p[LED_BYTES])
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{
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uint8_t i;
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for (i = 0; i != 8; i++) {
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while (!(UCSR0A & (1 << UDRE0)));
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UDR0 = p[i];
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}
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/*
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* There doesn't seem to be any reliable way to synchronize with the
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* end of the shift operation register that wouldn't cli/sei. Note
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* that, since the receiver is disabled, we can't use the RX side for
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* this purpose (as it is done in the atusb firmware).
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*
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* So instead we just wait for the worst-case delay, being one byte
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* in the shift register and another byte in the transmit buffer,
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* giving a total of 16 bits.
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*
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* This is a bit too pessimistic and produces a slight extra delay of
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* about 1.8 us. (The whole pattern transmission takes 16 us.)
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* See also ../doc/lclk-1123.png
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*/
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_delay_us(4); /* 16 bits at 4 MHz */
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SET(LED_LCLK);
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CLR(LED_LCLK);
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}
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void led_off(void)
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{
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static uint8_t zero[LED_BYTES];
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led_show(zero);
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}
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void led_init(void)
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{
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CLR(LED_SCLK);
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OUT(LED_SCLK);
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CLR(LED_LCLK);
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OUT(LED_LCLK);
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UBRR0 = 0; /* maximum data rate */
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UCSR0C =
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1 << UMSEL01 | /* Master SPI */
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1 << UMSEL00 |
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1 << UDORD0 | /* MSB first */
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0 << UCPHA0 | /* SPI Mode 0 */
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0 << UCPOL0;
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UCSR0B =
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1 << TXEN0; /* enable transmitter */
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UBRR0 = 0; /* the manual sez we need this */
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led_off();
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}
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28
tornado/fw/led.h
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28
tornado/fw/led.h
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@ -0,0 +1,28 @@
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/*
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* fw/led.h - LED control
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*
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* Written 2012 by Werner Almesberger
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* Copyright 2012 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef LED_H
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#define LED_H
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#include <stdint.h>
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#define N_LEDS 64
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#define LED_BYTES (N_LEDS/8)
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void led_show(const uint8_t p[LED_BYTES]);
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void led_off(void);
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void led_init(void);
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#endif /* !LED_H */
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@ -5,6 +5,7 @@
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#include <util/delay.h>
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#include "io.h"
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#include "led.h"
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#define HIGH(port) \
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@ -38,9 +39,6 @@
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#endif
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#define N_LEDS 64
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static void send(uint8_t pattern[N_LEDS/8])
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{
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uint8_t i, j, mask;
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@ -96,7 +94,7 @@ static uint16_t adc(bool x)
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int main(void)
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{
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static uint8_t p[N_LEDS/8];
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static uint8_t p[LED_BYTES];
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uint8_t mode = 0;
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uint16_t n = 0, v;
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@ -119,6 +117,7 @@ int main(void)
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OUT(VDD);
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#endif
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led_init();
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while (1) {
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while (!PIN(SW_SW));
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@ -149,9 +148,9 @@ int main(void)
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p[(v >> 3) & 7] &= ~(1 << (v & 7));
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else
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p[(v >> 3) & 7] |= 1 << (v & 7);
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send(p);
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led_show(p);
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n++;
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}
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_delay_ms(1);
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_delay_ms(100);
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}
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}
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