tekka
9b41d2a8e6
Enhancements: static parent, bootloader commands, updated delay funtion for more precise timing and minor improvements
129 lines
3.2 KiB
C
129 lines
3.2 KiB
C
#ifndef MYSBootloaderHW_H
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#define MYSBootloaderHW_H
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#include <stdlib.h>
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// hardware
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#define F_CPU_DIV clock_div_4
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#define F_CPU_REAL F_CPU / (F_CPU_DIV)
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#define BAUD_SETTING (( (F_CPU_REAL + BAUD_RATE * 4L) / ((BAUD_RATE * 8L))) - 1 )
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#define BAUD_ACTUAL (F_CPU_REAL/(8 * ((BAUD_SETTING)+1)))
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#define BAUD_ERROR (( 100*(BAUD_RATE - BAUD_ACTUAL) ) / BAUD_RATE)
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#define UART_SRA UCSR0A
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#define UART_SRB UCSR0B
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#define UART_SRC UCSR0C
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#define UART_SRL UBRR0L
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#define UART_UDR UDR0
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// boolean definition
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typedef uint8_t bool;
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typedef uint8_t boolean;
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#define false 0x0
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#define true 0x1
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#define LOW 0x0
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#define HIGH 0x1
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// Watchdog definitions and functions
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#define WATCHDOG_OFF (0)
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#define WATCHDOG_16MS (_BV(WDE))
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#define WATCHDOG_32MS (_BV(WDP0) | _BV(WDE))
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#define WATCHDOG_64MS (_BV(WDP1) | _BV(WDE))
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#define WATCHDOG_125MS (_BV(WDP1) | _BV(WDP0) | _BV(WDE))
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#define WATCHDOG_250MS (_BV(WDP2) | _BV(WDE))
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#define WATCHDOG_500MS (_BV(WDP2) | _BV(WDP0) | _BV(WDE))
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#define WATCHDOG_1S (_BV(WDP2) | _BV(WDP1) | _BV(WDE))
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#define WATCHDOG_2S (_BV(WDP2) | _BV(WDP1) | _BV(WDP0) | _BV(WDE))
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#define WATCHDOG_4S (_BV(WDP3) | _BV(WDE))
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#define WATCHDOG_8S (_BV(WDP3) | _BV(WDP0) | _BV(WDE))
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inline void watchdogReset() {
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asm volatile ("wdr");
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}
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void watchdogConfig(uint8_t x) {
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WDTCSR = _BV(WDCE) | _BV(WDE);
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WDTCSR = x;
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}
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// SPI communication
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#define SPI_DDR DDRB
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#define SPI_PORT PORTB
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#define SPI_PIN PINB
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#define SPI_SCLK 5 // Arduino Pin 13 <-> Bit 5 of port B
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#define SPI_MISO 4 // Arduino Pin 12 <-> Bit 4 of port B
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#define SPI_MOSI 3 // Arduino Pin 11 <-> Bit 3 of port B
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#define SPI_CSN 2 // Arduino Pin 10 <-> Bit 2 of port B
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#define SPI_CE 1 // Arduino Pin 9 <-> Bit 1 of port B
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#define CE_PULSE_LENGTH 20 // IMPORTANT: minimum CE pulse width 10us, see nRF24L01 specs. Set 20us to be on the safe side
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#define csnlow() SPI_PORT &= ~_BV(SPI_CSN)
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#define csnhigh() SPI_PORT |= _BV(SPI_CSN)
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#define celow() SPI_PORT &= ~_BV(SPI_CE)
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#define cehigh() SPI_PORT |= _BV(SPI_CE)
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static void SPIinit() {
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// set pin mode: MOSI,SCLK,CE = OUTPUT, MISO = INPUT
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SPI_DDR = _BV(SPI_MOSI) | _BV(SPI_SCLK) | _BV(SPI_CE) | _BV(SPI_CSN) | ~_BV(SPI_MISO);
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}
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static uint8_t SPItransfer(uint8_t value) {
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// bit bang SPI
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for(uint8_t i = 0; i<8; i++) {
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if (value & 0x80) SPI_PORT |= _BV(SPI_MOSI); else SPI_PORT &= ~_BV(SPI_MOSI);
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//_delay_us(1);
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value <<= 1;
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SPI_PORT |= _BV(SPI_SCLK);
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//_delay_us(1);
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value |= ((SPI_PIN >> SPI_MISO) & 0x01);
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SPI_PORT &= ~_BV(SPI_SCLK);
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//_delay_us(1);
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}
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return value;
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}
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// UART debug
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static void uart_init() {
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//Double speed mode USART0
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UART_SRA = _BV(U2X0);
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UART_SRB = _BV(RXEN0) | _BV(TXEN0);
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UART_SRC = _BV(UCSZ00) | _BV(UCSZ01);
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UART_SRL = (uint8_t)( (F_CPU + BAUD_RATE * 4L) / (BAUD_RATE * 8L) - 1 );
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}
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void putch(char ch) {
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while (!(UART_SRA & _BV(UDRE0)));
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UART_UDR = ch;
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}
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uint8_t getch() {
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uint8_t ch;
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// wait until char received
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while(!(UART_SRA & _BV(RXC0)));
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// framing error?
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if (!(UART_SRA & _BV(FE0))) {
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watchdogReset();
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}
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ch = UART_UDR;
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return ch;
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}
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static void put_string(char *s) {
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while (*s)
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putch(*s++);
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}
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static void put_int(uint8_t i) {
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char s[5];
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itoa( i, s, 10 );
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put_string( s );
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}
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#endif // MYSBootloaderHW_H
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