156 lines
3.1 KiB
C
156 lines
3.1 KiB
C
#ifndef MyOtaBootloaderHW_H
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#define MyOtaBootloaderHW_H
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#include <stdlib.h>
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#include <avr/power.h>
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//#define LED_DEBUG
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//#define UART_DEBUG
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// hardware
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// ********
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#define F_CPU_DIV clock_div_4
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#define F_CPU_REAL F_CPU / (1 << F_CPU_DIV)
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#define UART_BAUD 9600UL
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#define DELAY_M 125 * (1 << F_CPU_DIV)
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// boolean definition
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// ******************
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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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// delay
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// *****
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static void delayu() {
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asm("nop");
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}
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static void delaym(uint8_t t) {
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uint8_t d;
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uint16_t a;
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for (d = 0; d < t; d++)
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for (a = 0; a < DELAY_M; a++)
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asm("nop");
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}
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// LED debug
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// *********
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#ifdef LED_DEBUG
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#define LED_DDR DDRD
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#define LED_PORT PORTD
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#define LED_RED 6 // Arduino Pin 6 <-> Bit 6 of port D
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#define LED_GREEN 7 // Arduino Pin 7 <-> Bit 7 of port D
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#define LED_MRED (1 << LED_RED)
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#define LED_MGREEN (1 << LED_GREEN)
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#define LED_MBOTH (LED_MRED | LED_MGREEN)
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static void led_init() {
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LED_DDR |= LED_MBOTH;
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LED_PORT &= ~LED_MBOTH;
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}
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static void blink(uint8_t mask, uint16_t time) {
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LED_PORT |= mask;
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if (time > 0)
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{
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delaym(time);
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LED_PORT &= ~mask;
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delaym(time);
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}
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}
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#endif
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// UART debug
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// **********
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#ifdef UART_DEBUG
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static void uart_init()
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{
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UCSR0A = _BV(U2X0); //Double speed mode USART0
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UCSR0B = _BV(RXEN0) | _BV(TXEN0);
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UCSR0C = _BV(UCSZ00) | _BV(UCSZ01);
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UBRR0L = (uint8_t)( (F_CPU_REAL + UART_BAUD * 4L) / (UART_BAUD * 8L) - 1 );
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}
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static void uart_putc(char ch) {
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while (!(UCSR0A & _BV(UDRE0)));
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UDR0 = ch;
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}
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static void uart_puts(char *s)
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{
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while (*s)
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uart_putc(*s++);
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}
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static void uart_puti(uint8_t i)
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{
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char s[5];
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itoa( i, s, 10 );
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uart_puts( s );
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}
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#endif
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// SPI communication
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// *****************
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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 csnlow() SPI_PORT &= ~(1<<SPI_CSN);delaym(1)
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#define csnhigh() SPI_PORT |= (1<<SPI_CSN);delaym(1)
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#define celow() SPI_PORT &= ~(1<<SPI_CE);delaym(1)
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#define cehigh() SPI_PORT |= (1<<SPI_CE);delaym(1)
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static void SPIinit()
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{
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SPI_DDR |= (1 << SPI_MOSI) + (1 << SPI_SCLK) + (1 << SPI_CE) + (1 << SPI_CSN);
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SPI_DDR &= ~(1 << SPI_MISO);
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SPI_PORT &= ~((1 << SPI_MOSI) + (1 << SPI_SCLK) + (1 << SPI_CE));
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SPI_PORT |= (1 << SPI_CSN);
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}
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static uint8_t SPItransfer(uint8_t value)
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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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delayu();
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if ((value & 0x80) == 0x00)
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SPI_PORT &= ~(1 << SPI_MOSI);
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else
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SPI_PORT |= (1 << SPI_MOSI);
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value = (value << 1); // shift next bit into MSB..
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delayu();
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SPI_PORT |= (1 << SPI_SCLK);
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value |= ((SPI_PIN >> SPI_MISO) & 0x01); // capture current MISO bit
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delayu();
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SPI_PORT &= ~(1 << SPI_SCLK);
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delayu();
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}
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return value;
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}
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static uint8_t spiTrans(uint8_t cmd){
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uint8_t status;
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csnlow();
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status = SPItransfer( cmd );
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csnhigh();
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return status;
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}
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#endif // MyOtaBootloaderHW_H
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