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isp.cpp
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isp.cpp
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#if defined TEENSYDUINO
// ArduinoISP
// Copyright (c) 2008-2011 Randall Bohn
// If you require a license, see
// http://www.opensource.org/licenses/bsd-license.php
//
// This sketch turns the Arduino into a AVRISP
// using the following arduino pins:
//
// Pin 10 is used to reset the target microcontroller.
//
// By default, the hardware SPI pins MISO, MOSI and SCK pins are used
// to communicate with the target. On all Arduinos, these pins can be found
// on the ICSP/SPI header:
//
// MISO °. . 5V (!) Avoid this pin on Due, Zero...
// SCK . . MOSI
// . . GND
//
// On some Arduinos (Uno,...), pins MOSI, MISO and SCK are the same pins
// as digital pin 11, 12 and 13, respectively. That is why many tutorials
// instruct you to hook up the target to these pins. If you find this wiring
// more practical, have a define USE_OLD_STYLE_WIRING. This will work even
// even when not using an Uno. (On an Uno this is not needed).
//
// Alternatively you can use any other digital pin by configuring software ('BitBanged')
// SPI and having appropriate defines for PIN_MOSI, PIN_MISO and PIN_SCK.
//
// IMPORTANT: When using an Arduino that is not 5V tolerant (Due, Zero, ...)
// as the programmer, make sure to not expose any of the programmer's pins to 5V.
// A simple way to accomplish this is to power the complete system (programmer
// and target) at 3V3.
//
// Put an LED (with resistor) on the following pins:
// 9: Heartbeat - shows the programmer is running
// 8: Error - Lights up if something goes wrong (use red if that makes sense)
// 7: Programming - In communication with the slave
//
#include "defines.h"
#include "isp.h"
// Configure SPI clock (in Hz).
// E.g. for an attiny @128 kHz: the datasheet states that both the high
// and low spi clock pulse must be > 2 cpu cycles, so take 3 cycles i.e.
// divide target f_cpu by 6:
// #define SPI_CLOCK (128000/6)
//
// A clock slow enough for an attiny85 @ 1MHz, is a reasonable default:
#define SPI_CLOCK (1000000/6)
// Configure which pins to use:
// The standard pin configuration.
#define HWVER 2
#define SWMAJ 1
#define SWMIN 18
// STK Definitions
#define STK_OK 0x10
#define STK_FAILED 0x11
#define STK_UNKNOWN 0x12
#define STK_INSYNC 0x14
#define STK_NOSYNC 0x15
#define CRC_EOP 0x20 //ok it is a space...
#define EECHUNK (32)
#define beget16(addr) (*addr * 256 + *(addr+1) )
void isp::frame(pixelArray **strip, WII **wii) {
for (int i=0; i<PLAYERS; i++) {
if (!wii[i]->wiimoteConnected) continue;
if (wii[i]->getButtonClick(UP) || wii[i]->getButtonClick(DOWN)) {
if (!pmode) side = !side;
}
}
strip[0]->clear();
strip[0]->string(
side ? "85R" : "85L",
1,
GRID_HEIGHT-6,
side ? color_t::yellow() : color_t::teal()
);
}
void isp::loop(pixelArray **strip, WII **wii) {
if (!Serial.available()) return;
uint8_t ch = getch();
switch (ch) {
case '0': // signon
error = 0;
empty_reply();
break;
case '1':
if (getch() == CRC_EOP) {
Serial.print((char) STK_INSYNC);
Serial.print(F("AVR ISP"));
Serial.print((char) STK_OK);
} else {
error++;
Serial.print((char) STK_NOSYNC);
}
break;
case 'A':
get_version(getch());
break;
case 'B':
fill(20);
set_parameters();
empty_reply();
break;
case 'E': // extended parameters - ignore for now
fill(5);
empty_reply();
break;
case 'P':
if (!pmode) start_pmode();
empty_reply();
break;
case 'U': // set address (word)
here = getch();
here += 256 * getch();
empty_reply();
break;
case 0x60: //STK_PROG_FLASH
getch(); // low addr
getch(); // high addr
empty_reply();
break;
case 0x61: //STK_PROG_DATA
getch(); // data
empty_reply();
break;
case 0x64: //STK_PROG_PAGE
program_page();
break;
case 0x74: //STK_READ_PAGE 't'
read_page();
break;
case 'V': //0x56
universal();
break;
case 'Q': //0x51
error = 0;
end_pmode();
empty_reply();
break;
case 0x75: //STK_READ_SIGN 'u'
read_signature();
break;
// expecting a command, not CRC_EOP
// this is how we can get back in sync
case CRC_EOP:
error++;
Serial.print((char) STK_NOSYNC);
break;
// anything else we will return STK_UNKNOWN
default:
error++;
if (CRC_EOP == getch()) {
Serial.print((char)STK_UNKNOWN);
} else {
Serial.print((char)STK_NOSYNC);
}
}
}
void isp::reset_target(bool reset) {
digitalWrite(
reset_pin(),
((reset && reset_high) || (!reset && !reset_high))
? HIGH
: LOW
);
}
uint8_t isp::getch() {
while (!Serial.available());
return Serial.read();
}
void isp::fill(int n) {
for (int x = 0; x < n; x++) {
buff[x] = getch();
}
}
uint8_t isp::spi_transaction(uint8_t a, uint8_t b, uint8_t c, uint8_t d) {
SPI.transfer(a);
SPI.transfer(b);
SPI.transfer(c);
return SPI.transfer(d);
}
void isp::empty_reply() {
if (CRC_EOP == getch()) {
Serial.print((char)STK_INSYNC);
Serial.print((char)STK_OK);
} else {
error++;
Serial.print((char)STK_NOSYNC);
}
}
void isp::breply(uint8_t b) {
if (CRC_EOP == getch()) {
Serial.print((char)STK_INSYNC);
Serial.print((char)b);
Serial.print((char)STK_OK);
} else {
error++;
Serial.print((char)STK_NOSYNC);
}
}
void isp::get_version(uint8_t c) {
switch (c) {
case 0x80:
breply(HWVER);
break;
case 0x81:
breply(SWMAJ);
break;
case 0x82:
breply(SWMIN);
break;
case 0x93:
breply('S'); // Serial programmer
break;
default:
breply(0);
}
}
void isp::set_parameters() {
// call this after reading paramter packet into buff[]
param.devicecode = buff[0];
param.revision = buff[1];
param.progtype = buff[2];
param.parmode = buff[3];
param.polling = buff[4];
param.selftimed = buff[5];
param.lockbytes = buff[6];
param.fusebytes = buff[7];
param.flashpoll = buff[8];
// ignore buff[9] (= buff[8])
// following are 16 bits (big endian)
param.eeprompoll = beget16(&buff[10]);
param.pagesize = beget16(&buff[12]);
param.eepromsize = beget16(&buff[14]);
// 32 bits flashsize (big endian)
param.flashsize = buff[16] * 0x01000000
+ buff[17] * 0x00010000
+ buff[18] * 0x00000100
+ buff[19];
// avr devices have active low reset, at89sx are active high
reset_high = (param.devicecode >= 0xe0);
}
void isp::start_pmode() {
// Reset target before driving PIN_SCK or PIN_MOSI
// SPI.begin() will configure SS as output,
// so SPI master mode is selected.
// We have defined RESET as pin 10,
// which for many arduino's is not the SS pin.
// So we have to configure RESET as output here,
// (reset_target() first sets the correct level)
reset_target(true);
pinMode(reset_pin(), OUTPUT);
SPI.begin();
SPI.beginTransaction(SPI_CLOCK);
// See avr datasheets, chapter "Serial_PRG Programming Algorithm":
// Pulse RESET after PIN_SCK is low:
digitalWrite(PIN_SCK, LOW);
delay(20); // discharge PIN_SCK, value arbitrally chosen
reset_target(false);
// Pulse must be minimum 2 target CPU clock cycles
// so 100 usec is ok for CPU speeds above 20KHz
delayMicroseconds(100);
reset_target(true);
// Send the enable programming command:
delay(50); // datasheet: must be > 20 msec
spi_transaction(0xAC, 0x53, 0x00, 0x00);
pmode = 1;
}
void isp::end_pmode() {
SPI.end();
// We're about to take the target out of reset
// so configure SPI pins as input
pinMode(PIN_MOSI, INPUT);
pinMode(PIN_SCK, INPUT);
reset_target(false);
pinMode(reset_pin(), INPUT);
pmode = 0;
}
void isp::universal() {
uint8_t ch;
fill(4);
ch = spi_transaction(buff[0], buff[1], buff[2], buff[3]);
breply(ch);
}
void isp::flash(uint8_t hilo, unsigned int addr, uint8_t data) {
spi_transaction(0x40 + 8 * hilo,
addr >> 8 & 0xFF,
addr & 0xFF,
data);
}
void isp::commit(unsigned int addr) {
spi_transaction(0x4C, (addr >> 8) & 0xFF, addr & 0xFF, 0);
}
unsigned int isp::current_page() {
if (param.pagesize == 32) {
return here & 0xFFFFFFF0;
}
if (param.pagesize == 64) {
return here & 0xFFFFFFE0;
}
if (param.pagesize == 128) {
return here & 0xFFFFFFC0;
}
if (param.pagesize == 256) {
return here & 0xFFFFFF80;
}
return here;
}
void isp::write_flash(int length) {
fill(length);
if (CRC_EOP == getch()) {
Serial.print((char) STK_INSYNC);
Serial.print((char) write_flash_pages(length));
} else {
error++;
Serial.print((char) STK_NOSYNC);
}
}
uint8_t isp::write_flash_pages(int length) {
int x = 0;
unsigned int page = current_page();
while (x < length) {
if (page != current_page()) {
commit(page);
page = current_page();
}
flash(LOW, here, buff[x++]);
flash(HIGH, here, buff[x++]);
here++;
}
commit(page);
return STK_OK;
}
uint8_t isp::write_eeprom(unsigned int length) {
// here is a word address, get the byte address
unsigned int start = here * 2;
unsigned int remaining = length;
if (length > param.eepromsize) {
error++;
return STK_FAILED;
}
while (remaining > EECHUNK) {
write_eeprom_chunk(start, EECHUNK);
start += EECHUNK;
remaining -= EECHUNK;
}
write_eeprom_chunk(start, remaining);
return STK_OK;
}
// write (length) bytes, (start) is a byte address
uint8_t isp::write_eeprom_chunk(unsigned int start, unsigned int length) {
// this writes byte-by-byte,
// page writing may be faster (4 bytes at a time)
fill(length);
for (unsigned int x = 0; x < length; x++) {
unsigned int addr = start + x;
spi_transaction(0xC0, (addr >> 8) & 0xFF, addr & 0xFF, buff[x]);
delay(45);
}
return STK_OK;
}
void isp::program_page() {
char result = (char) STK_FAILED;
unsigned int length = 256 * getch();
length += getch();
char memtype = getch();
// flash memory @here, (length) bytes
if (memtype == 'F') {
write_flash(length);
return;
}
if (memtype == 'E') {
result = (char)write_eeprom(length);
if (CRC_EOP == getch()) {
Serial.print((char) STK_INSYNC);
Serial.print(result);
} else {
error++;
Serial.print((char) STK_NOSYNC);
}
return;
}
Serial.print((char)STK_FAILED);
return;
}
uint8_t isp::flash_read(uint8_t hilo, unsigned int addr) {
return spi_transaction(
0x20 + hilo * 8,
(addr >> 8) & 0xFF,
addr & 0xFF,
0
);
}
char isp::flash_read_page(int length) {
for (int x = 0; x < length; x += 2) {
uint8_t low = flash_read(LOW, here);
Serial.print((char) low);
uint8_t high = flash_read(HIGH, here);
Serial.print((char) high);
here++;
}
return STK_OK;
}
char isp::eeprom_read_page(int length) {
// here again we have a word address
int start = here * 2;
for (int x = 0; x < length; x++) {
int addr = start + x;
uint8_t ee = spi_transaction(0xA0, (addr >> 8) & 0xFF, addr & 0xFF, 0xFF);
Serial.print((char) ee);
}
return STK_OK;
}
void isp::read_page() {
char result = (char)STK_FAILED;
int length = 256 * getch();
length += getch();
char memtype = getch();
if (CRC_EOP != getch()) {
error++;
Serial.print((char) STK_NOSYNC);
return;
}
Serial.print((char) STK_INSYNC);
if (memtype == 'F') result = flash_read_page(length);
if (memtype == 'E') result = eeprom_read_page(length);
Serial.print(result);
}
void isp::read_signature() {
if (CRC_EOP != getch()) {
error++;
Serial.print((char) STK_NOSYNC);
return;
}
Serial.print((char) STK_INSYNC);
uint8_t high = spi_transaction(0x30, 0x00, 0x00, 0x00);
Serial.print((char) high);
uint8_t middle = spi_transaction(0x30, 0x00, 0x01, 0x00);
Serial.print((char) middle);
uint8_t low = spi_transaction(0x30, 0x00, 0x02, 0x00);
Serial.print((char) low);
Serial.print((char) STK_OK);
}
#endif //TEENSYDUINO