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author | VG <vg@devys.org> | 2015-08-26 18:45:01 +0200 |
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committer | VG <vg@devys.org> | 2015-08-26 18:45:01 +0200 |
commit | 7346cfaad4d969db060f3c7ae242ea93f4fff5c0 (patch) | |
tree | 3d3a09a29f783270b8da931e3c879234553ec43f /serial | |
download | avr-7346cfaad4d969db060f3c7ae242ea93f4fff5c0.tar.gz avr-7346cfaad4d969db060f3c7ae242ea93f4fff5c0.tar.bz2 avr-7346cfaad4d969db060f3c7ae242ea93f4fff5c0.zip |
first commitboo-standby-watcher-last-with-amp
Diffstat (limited to 'serial')
-rw-r--r-- | serial/Makefile | 35 | ||||
-rw-r--r-- | serial/main.c | 25 | ||||
-rw-r--r-- | serial/uart.h | 76 |
3 files changed, 136 insertions, 0 deletions
diff --git a/serial/Makefile b/serial/Makefile new file mode 100644 index 0000000..98f1efc --- /dev/null +++ b/serial/Makefile @@ -0,0 +1,35 @@ +# settings for arduino +DEVICE = atmega328p +CLOCK = 16000000 +PORT=/dev/serial/by-id/usb-FTDI_FT232R_USB_UART_A400XJSH-if00-port0 +#AVRDUDE=avrdude -V -F -p m328p -c arduino -b 115200 -P$(PORT) +#AVRDUDE=avrdude -p $(DEVICE) -c arduino -b 115200 -P $(PORT) +AVRDUDE=avrdude -p $(DEVICE) -c arduino -b 57600 -P $(PORT) + +DEFS = -DF_CPU=$(CLOCK)UL +LIBS = -Wl,--relax,--gc-sections,--print-gc-sections,--entry=main +LIBS = -Wl,--entry=main,--gc-sections,--rela +CFLAGS = -Wall -Werror -pedantic -std=c99 +CFLAGS += -Os -funsigned-bitfields -fpack-struct -fshort-enums +CFLAGS += -mmcu=$(DEVICE) $(DEFS) +#LDFLAGS = $(LIBS) + +all: main.hex size + +main.hex: main.c + avr-gcc -o main.elf $? $(CFLAGS) $(LDFLAGS) + avr-objcopy -j .text -j .data -O ihex main.elf main.hex + +f: flash +flash: all + $(AVRDUDE) -U flash:w:main.hex:i + +clean: + rm -f *.o *.elf *.hex + +size: + avr-size --mcu=$(DEVICE) -t -A main.elf + avr-size --mcu=$(DEVICE) -C main.elf + avr-nm --size-sort main.elf + + diff --git a/serial/main.c b/serial/main.c new file mode 100644 index 0000000..2e9ff5c --- /dev/null +++ b/serial/main.c @@ -0,0 +1,25 @@ +#include <avr/io.h> +#include "uart.h" + +int main(void) +{ + /* serial */ + uart_init(); + + /* D4 = output and high (=> atx down) */ + PORTD |= 0x10; + DDRD |= 0x10; + + for (;;) + { + switch(uart_getchar()) { + case '?': break; /* useful for auto documentation */ + case '0': PORTD |= 0x10; break; + case '1': PORTD &= ~0x10; break; + case 'T': PORTD ^= 0x10; break; + } + uart_putchar((PORTD & 0x10) ? '0' : '1'); + } + + return 0; +} diff --git a/serial/uart.h b/serial/uart.h new file mode 100644 index 0000000..22e0655 --- /dev/null +++ b/serial/uart.h @@ -0,0 +1,76 @@ +/* #define F_CPU 16000000UL <= defined in Makefile */ +#define BAUD 9600 + +/* This file is *highly* inspired from: + * http://www.appelsiini.net/2011/simple-usart-with-avr-libc + */ + +#include <util/setbaud.h> + +#if 0 +static inline void uart_init() +{ + UCSRB |= (1 << RXEN) | (1 << TXEN); + UCSRC |= (1 << UCSZ0) | (1 << UCSZ1); +#define BAUD 115200 +#include <util/setbaud.h> + UBRRH = UBRRH_VALUE; + UBRRL = UBRRL_VALUE; +#if USE_2X + UCSRA |= (1 << U2X); +#else + UCSRA &= ~(1 << U2X); +#endif +} +#endif + +void uart_init(void) +{ + UBRR0H = UBRRH_VALUE; + UBRR0L = UBRRL_VALUE; + +#if USE_2X + UCSR0A |= _BV(U2X0); +#else + UCSR0A &= ~(_BV(U2X0)); +#endif + + UCSR0C = _BV(UCSZ01) | _BV(UCSZ00); /* 8-bit data */ + UCSR0B = _BV(RXEN0) | _BV(TXEN0); /* Enable RX and TX */ +} + +void uart_putchar(char c) +{ + UDR0 = c; + loop_until_bit_is_set(UCSR0A, TXC0); /* Wait until transmission ready. */ +} + +char uart_getchar(void) +{ + loop_until_bit_is_set(UCSR0A, RXC0); /* Wait until data exists. */ + return UDR0; +} + +#if 0 +/* alternatives for stream uses */ +void uart_putchar(char c, FILE *stream) +{ + if (c == '\n') { + uart_putchar('\r', stream); + } + loop_until_bit_is_set(UCSR0A, UDRE0); + UDR0 = c; +} + +char uart_getchar(FILE *stream) +{ + loop_until_bit_is_set(UCSR0A, RXC0); /* Wait until data exists. */ + return UDR0; +} +#endif + +#if 0 +FILE uart_output = FDEV_SETUP_STREAM(uart_putchar, NULL, _FDEV_SETUP_WRITE); +FILE uart_input = FDEV_SETUP_STREAM(NULL, uart_getchar, _FDEV_SETUP_READ); +FILE uart_io FDEV_SETUP_STREAM(uart_putchar, uart_getchar, _FDEV_SETUP_RW); +#endif |