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SPI_MSTransfer.cpp
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/*
MIT License
Copyright (c) 2018 Antonio Alexander Brewer (tonton81) - https://github.com/tonton81
Contributors:
Tim - https://github.com/Defragster
Mike - https://github.com/mjs513
Designed and tested for PJRC Teensy 3.2, 3.5, and 3.6 boards.
Forum link : https : //forum.pjrc.com/threads/50008-Project-SPI_MSTransfer
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#include <SPI_MSTransfer.h>
#include "Stream.h"
#include <SPI.h>
#include "circular_buffer.h"
#include <i2c_t3.h>
#include <EEPROM.h>
#include <functional>
#include <atomic>
SPI_MSTransfer *_slave_pointer;
_slave_handler_ptr SPI_MSTransfer::_slave_handler = nullptr; // SLAVE
_master_handler_ptr SPI_MSTransfer::_master_handler = nullptr; // MASTER
_slave_handler_ptr_uint8_t SPI_MSTransfer::_slave_handler_uint8_t = nullptr; // SLAVE
_master_handler_ptr_uint8_t SPI_MSTransfer::_master_handler_uint8_t = nullptr; // MASTER
bool SPI_MSTransfer::watchdogEnabled = 0; // SLAVE
uint32_t SPI_MSTransfer::watchdogFeedInterval = millis(); // SLAVE
uint32_t SPI_MSTransfer::watchdogTimeout = 0; // SLAVE
Circular_Buffer<uint16_t, SPI_MST_QUEUE_SLOTS, SPI_MST_DATA_BUFFER_MAX> SPI_MSTransfer::mtsca; // BOTH
Circular_Buffer<uint16_t, SPI_MST_QUEUE_SLOTS, SPI_MST_DATA_BUFFER_MAX> SPI_MSTransfer::stmca; // BOTH
_wire_onReceive SPI_MSTransfer::_wire_onReceivefunc = nullptr; // MASTER
_detectPtr SPI_MSTransfer::_slaveDetectHandler = nullptr; // MASTER
volatile bool SPI_MSTransfer::_wire_callback_active = 0; // SLAVE
volatile uint8_t SPI_MSTransfer::_wire_callback_readpos = 0; // SLAVE
std::atomic<bool> SPI_MSTransfer::_slave_data_available = ATOMIC_FLAG_INIT; // MASTER
std::atomic<bool> SPI_MSTransfer::_slave_queue_active = ATOMIC_FLAG_INIT; // SLAVE
std::atomic<bool> SPI_MSTransfer::_slave_dequeue_active = ATOMIC_FLAG_INIT; // SLAVE
void SPI_MSTransfer::onTransfer(_slave_handler_ptr handler) {
if ( _master_access ) _master_handler = handler;
if ( _slave_access ) _slave_handler = handler;
}
void SPI_MSTransfer::onTransfer(_slave_handler_ptr_uint8_t handler) {
if ( _master_access ) _master_handler_uint8_t = handler;
if ( _slave_access ) _slave_handler_uint8_t = handler;
}
SPI_MSTransfer::SPI_MSTransfer(const char *data, uint8_t cs, SPIClass *SPIWire, uint32_t spi_bus_speed) {
chip_select = cs; spi_port = SPIWire; _master_access = 1; _spi_bus_speed = spi_bus_speed;
::pinMode(cs, OUTPUT); // make sure CS is OUTPUT before deassertion.
::digitalWriteFast(cs, HIGH); // deassert the CS way before SPI initializes :)
if ( spi_bus_speed >= 12000000 ) _delay_before_deassertion = 0;
debugSerial = nullptr;
spi_port->begin();
if ( !strcmp(data, "Serial") ) _serial_port_identifier = 0;
else if ( !strcmp(data, "Serial1") ) _serial_port_identifier = 1;
else if ( !strcmp(data, "Serial2") ) _serial_port_identifier = 2;
else if ( !strcmp(data, "Serial3") ) _serial_port_identifier = 3;
else if ( !strcmp(data, "Serial4") ) _serial_port_identifier = 4;
else if ( !strcmp(data, "Serial5") ) _serial_port_identifier = 5;
else if ( !strcmp(data, "Serial6") ) _serial_port_identifier = 6;
else if ( !strcmp(data, "EEPROM") ) eeprom_support = 1;
else if ( !strcmp(data, "Wire") ) wire_port = 0;
else if ( !strcmp(data, "Wire1") ) wire_port = 1;
else if ( !strcmp(data, "Wire2") ) wire_port = 2;
else if ( !strcmp(data, "Wire3") ) wire_port = 3;
else if ( !strcmp(data, "SPI1") ) remote_spi_port = 1;
else if ( !strcmp(data, "SPI2") ) remote_spi_port = 2;
else if ( !strcmp(data, "FastLED" ) ) fastled_support = 1;
else if ( !strcmp(data, "SERVO") ) servo_support = 1;
}
void SPI_MSTransfer::debug(Stream &serial) {
debugSerial = &serial;
Serial.print("DBG: [S_CS "); Serial.print(chip_select);
Serial.print("] CB Capacity: "); Serial.print(mtsca.capacity());
Serial.print(" Length: "); Serial.println(mtsca.max_size());
}
void SPI_MSTransfer::SPI_assert() {
spi_port->beginTransaction(SPISettings(_spi_bus_speed, MSBFIRST, SPI_MODE0)); ::digitalWriteFast(chip_select, LOW);
}
void SPI_MSTransfer::SPI_deassert() {
delayMicroseconds(_delay_before_deassertion);
::digitalWriteFast(chip_select, HIGH);
spi_port->endTransaction();
}
bool SPI_MSTransfer::command_ack_response(uint16_t *data, uint32_t len) {
uint8_t resend_count = 0; uint32_t timeout = micros(); uint16_t _crc = 0;
while ( 1 ) {
_crc = spi_port->transfer16(0xFFFF);
if ( _crc == 0xF00D ) {
spi_port->transfer16(0xBEEF); break;
}
else if ( _crc == 0xBAAD || micros() - timeout > 10000 ) {
resend_count++;
if ( resend_count > 3 ) {
if ( debugSerial != nullptr ) {
Serial.print("DBG: [S_CS "); Serial.print(chip_select);
Serial.print("] FAIL_RES #"); Serial.print(resend_count);
Serial.println(" Tx ABORT. "); delay(1000);
}
SPI_deassert(); return 0;
}
if ( debugSerial != nullptr ) {
Serial.print("FAIL_Res #"); Serial.print(resend_count);
Serial.println(" RETRY..."); delay(1000);
}
spi_port->transfer16(0xBEEF);
SPI_deassert();
delayMicroseconds(50);
SPI_assert();
for ( uint16_t i = 0; i < len; i++ ) spi_port->transfer16(data[i]);
timeout = micros();
}
}
return 1;
}
void SPI_MSTransfer::digitalWriteFast(uint8_t pin, bool state) {
digitalWrite(pin, state);
}
void SPI_MSTransfer::digitalWrite(uint8_t pin, bool state) {
if ( _slave_access ) return;
uint16_t data[5], checksum = 0, data_pos = 0;
data[data_pos] = 0x9766; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0000; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = ((uint16_t)(pin << 8) | state); checksum ^= data[data_pos]; data_pos++;
data[data_pos] = checksum;
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) {
spi_port->transfer16(data[i]);
}
if ( !command_ack_response(data, sizeof(data) / 2) ) return; // RECEIPT ACK
for ( uint16_t i = 0; i < 3000UL; i++ ) {
if ( spi_port->transfer16(0xFFFF) == 0xAA55 ) {
uint16_t buf[spi_port->transfer16(0xFFFF)]; buf[0] = 0xAA55; buf[1] = sizeof(buf) / 2; checksum = buf[0]; checksum ^= buf[1];
for ( uint16_t i = 2; i < buf[1]; i++ ) {
delayMicroseconds(_transfer_slowdown_while_reading);
buf[i] = spi_port->transfer16(0xFFFF);
if ( i < buf[1] - 1 ) checksum ^= buf[i];
}
if ( checksum == buf[buf[1] - 1] ) {
spi_port->transfer16(0xD0D0); // send confirmation
SPI_deassert(); return;
}
}
}
SPI_deassert(); return;
}
bool SPI_MSTransfer::digitalReadFast(uint8_t pin) {
return digitalRead(pin);
}
bool SPI_MSTransfer::digitalRead(uint8_t pin) {
if ( _slave_access ) return 0;
uint16_t data[5], checksum = 0, data_pos = 0;
data[data_pos] = 0x9766; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0001; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = pin; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = checksum;
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) spi_port->transfer16(data[i]);
if ( !command_ack_response(data, sizeof(data) / 2) ) return 0; // RECEIPT ACK
for ( uint16_t i = 0; i < 3000UL; i++ ) {
if ( spi_port->transfer16(0xFFFF) == 0xAA55 ) {
uint16_t buf[spi_port->transfer16(0xFFFF)]; buf[0] = 0xAA55; buf[1] = sizeof(buf) / 2; checksum = buf[0]; checksum ^= buf[1];
for ( uint16_t i = 2; i < buf[1]; i++ ) {
delayMicroseconds(_transfer_slowdown_while_reading);
buf[i] = spi_port->transfer16(0xFFFF);
if ( i < buf[1] - 1 ) checksum ^= buf[i];
}
if ( checksum == buf[buf[1] - 1] ) {
spi_port->transfer16(0xD0D0); // send confirmation
SPI_deassert(); return buf[2];
}
}
}
SPI_deassert(); return 0;
}
void SPI_MSTransfer::pinMode(uint8_t pin, uint8_t state) {
if ( _slave_access ) return;
uint16_t data[5], checksum = 0, data_pos = 0;
data[data_pos] = 0x9766; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0002; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = ((uint16_t)(pin << 8) | state); checksum ^= data[data_pos]; data_pos++;
data[data_pos] = checksum;
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) spi_port->transfer16(data[i]);
if ( !command_ack_response(data, sizeof(data) / 2) ) return; // RECEIPT ACK
for ( uint16_t i = 0; i < 3000UL; i++ ) {
if ( spi_port->transfer16(0xFFFF) == 0xAA55 ) {
uint16_t buf[spi_port->transfer16(0xFFFF)]; buf[0] = 0xAA55; buf[1] = sizeof(buf) / 2; checksum = buf[0]; checksum ^= buf[1];
for ( uint16_t i = 2; i < buf[1]; i++ ) {
delayMicroseconds(_transfer_slowdown_while_reading);
buf[i] = spi_port->transfer16(0xFFFF);
if ( i < buf[1] - 1 ) checksum ^= buf[i];
}
if ( checksum == buf[buf[1] - 1] ) {
spi_port->transfer16(0xD0D0); // send confirmation
SPI_deassert(); return;
}
}
}
SPI_deassert(); return;
}
void SPI_MSTransfer::pinToggle(uint8_t pin) { // code written by defragster
if ( _slave_access ) return;
uint16_t data[5], checksum = 0, data_pos = 0;
data[data_pos] = 0x9766; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0003; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = pin; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = checksum;
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) spi_port->transfer16(data[i]);
if ( !command_ack_response(data, sizeof(data) / 2) ) return; // RECEIPT ACK
for ( uint16_t i = 0; i < 3000UL; i++ ) {
if ( spi_port->transfer16(0xFFFF) == 0xAA55 ) {
uint16_t buf[spi_port->transfer16(0xFFFF)]; buf[0] = 0xAA55; buf[1] = sizeof(buf) / 2; checksum = buf[0]; checksum ^= buf[1];
for ( uint16_t i = 2; i < buf[1]; i++ ) {
delayMicroseconds(_transfer_slowdown_while_reading);
buf[i] = spi_port->transfer16(0xFFFF);
if ( i < buf[1] - 1 ) checksum ^= buf[i];
}
if ( checksum == buf[buf[1] - 1] ) {
spi_port->transfer16(0xD0D0); // send confirmation
SPI_deassert(); return;
}
}
}
SPI_deassert(); return;
}
uint8_t SPI_MSTransfer::transfer(uint8_t *buffer, uint16_t length, uint16_t packetID, uint8_t fire_and_forget) {
if ( _slave_access ) {
uint16_t len = ( !(length % 2) ) ? ( length / 2 ) : ( length / 2 ) + 1;
uint16_t data[6 + len], checksum = 0, data_pos = 0;
data[data_pos] = 0xAA55; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0001; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = length; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = packetID; checksum ^= data[data_pos]; data_pos++;
bool odd_or_even = ( (length % 2) );
for ( uint16_t i = 0; i < length; i += 2 ) {
if ( odd_or_even ) {
if ( i + 1 < length ) {
data[data_pos] = ((uint16_t)(buffer[i] << 8) | buffer[i + 1]); checksum ^= data[data_pos]; data_pos++;
}
else {
data[data_pos] = buffer[i]; checksum ^= data[data_pos]; data_pos++;
}
}
else {
data[data_pos] = ((uint16_t)(buffer[i] << 8) | buffer[i + 1]); checksum ^= data[data_pos]; data_pos++;
}
}
data[data_pos] = checksum;
_slave_queue_active = 1;
stmca.push_back(data, data[1]);
_slave_queue_active = 0;
return packetID;
}
if ( _master_access ) {
uint16_t len = ( !(length % 2) ) ? ( length / 2 ) : ( length / 2 ) + 1;
uint16_t data[6 + len], checksum = 0, data_pos = 0;
data[data_pos] = ( fire_and_forget ) ? 0x9254 : 0x9253; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0000; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = length; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = packetID; checksum ^= data[data_pos]; data_pos++;
bool odd_or_even = ( (length % 2) );
for ( uint16_t i = 0; i < length; i += 2 ) {
if ( odd_or_even ) {
if ( i + 1 < length ) {
data[data_pos] = ((uint16_t)(buffer[i] << 8) | buffer[i + 1]); checksum ^= data[data_pos]; data_pos++;
}
else {
data[data_pos] = buffer[i]; checksum ^= data[data_pos]; data_pos++;
}
}
else {
data[data_pos] = ((uint16_t)(buffer[i] << 8) | buffer[i + 1]); checksum ^= data[data_pos]; data_pos++;
}
}
data[data_pos] = checksum;
if ( fire_and_forget == 1 ) {
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) spi_port->transfer16(data[i]);
uint32_t timeout = millis();
while ( spi_port->transfer16(0xFFFF) != 0xBABE && millis() - timeout < 100 );
spi_port->transfer16(0xD0D0); // send confirmation
SPI_deassert();
return data[4]; // F&F, RETURN PACKETID
}
else if ( fire_and_forget == 2 ) {
mtsca.push_back(data, data[1]);
return data[4];
}
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) spi_port->transfer16(data[i]);
if ( !command_ack_response(data, sizeof(data) / 2) ) return 0; // RECEIPT ACK
for ( uint16_t i = 0; i < 3000UL; i++ ) {
if ( spi_port->transfer16(0xFFFF) == 0xAA55 ) {
uint16_t buf[spi_port->transfer16(0xFFFF)]; buf[0] = 0xAA55; buf[1] = sizeof(buf) / 2; checksum = buf[0]; checksum ^= buf[1];
for ( uint16_t i = 2; i < buf[1]; i++ ) {
delayMicroseconds(_transfer_slowdown_while_reading);
buf[i] = spi_port->transfer16(0xFFFF);
if ( i < buf[1] - 1 ) checksum ^= buf[i];
}
if ( checksum == buf[buf[1] - 1] ) {
spi_port->transfer16(0xD0D0); // send confirmation
SPI_deassert(); return buf[2];
}
}
}
SPI_deassert();
}
return 0;
}
uint16_t SPI_MSTransfer::transfer16(uint16_t *buffer, uint16_t length, uint16_t packetID, uint8_t fire_and_forget) {
if ( _slave_access ) {
uint16_t data[6 + length], checksum = 0, data_pos = 0;
data[data_pos] = 0xAA55; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0000; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = length; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = packetID; checksum ^= data[data_pos]; data_pos++;
for ( uint16_t i = 0; i < length; i++ ) {
data[data_pos] = buffer[i];
checksum ^= data[data_pos];
data_pos++;
}
data[data_pos] = checksum;
_slave_queue_active = 1;
stmca.push_back(data, data[1]);
_slave_queue_active = 0;
return packetID;
}
if ( _master_access ) {
uint16_t data[6 + length], checksum = 0, data_pos = 0;
data[data_pos] = ( fire_and_forget ) ? 0x9244 : 0x9243; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0000; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = length; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = packetID; checksum ^= data[data_pos]; data_pos++;
for ( uint16_t i = 0; i < length; i++ ) {
data[data_pos] = buffer[i];
checksum ^= data[data_pos];
data_pos++;
}
data[data_pos] = checksum;
if ( fire_and_forget == 1 ) {
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) spi_port->transfer16(data[i]);
uint32_t timeout = millis();
while ( spi_port->transfer16(0xFFFF) != 0xBABE && millis() - timeout < 100 );
spi_port->transfer16(0xD0D0); // send confirmation
SPI_deassert();
return data[4]; // F&F, RETURN PACKETID
}
else if ( fire_and_forget == 2 ) {
mtsca.push_back(data, data[1]);
return data[4];
}
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) spi_port->transfer16(data[i]);
if ( !command_ack_response(data, sizeof(data) / 2) ) return 0; // RECEIPT ACK
for ( uint16_t i = 0; i < 3000UL; i++ ) {
if ( spi_port->transfer16(0xFFFF) == 0xAA55 ) {
uint16_t buf[spi_port->transfer16(0xFFFF)]; buf[0] = 0xAA55; buf[1] = sizeof(buf) / 2; checksum = buf[0]; checksum ^= buf[1];
for ( uint16_t i = 2; i < buf[1]; i++ ) {
delayMicroseconds(_transfer_slowdown_while_reading);
buf[i] = spi_port->transfer16(0xFFFF);
if ( i < buf[1] - 1 ) checksum ^= buf[i];
}
if ( checksum == buf[buf[1] - 1] ) {
spi_port->transfer16(0xD0D0); // send confirmation
SPI_deassert(); return buf[2];
}
}
}
SPI_deassert();
}
return 0;
}
void SPI_MSTransfer::begin(uint32_t baudrate) { // set remote serial port and baud
if ( _slave_access ) return;
if ( _serial_port_identifier != -1 ) {
uint16_t data[7], checksum = 0, data_pos = 0;
data[data_pos] = 0x3235; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0000; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = _serial_port_identifier; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = baudrate >> 16; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = baudrate; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = checksum;
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) spi_port->transfer16(data[i]);
if ( !command_ack_response(data, sizeof(data) / 2) ) return; // RECEIPT ACK
for ( uint16_t i = 0; i < 3000UL; i++ ) {
if ( spi_port->transfer16(0xFFFF) == 0xAA55 ) {
uint16_t buf[spi_port->transfer16(0xFFFF)]; buf[0] = 0xAA55; buf[1] = sizeof(buf) / 2; checksum = buf[0]; checksum ^= buf[1];
for ( uint16_t i = 2; i < buf[1]; i++ ) {
delayMicroseconds(_transfer_slowdown_while_reading);
buf[i] = spi_port->transfer16(0xFFFF);
if ( i < buf[1] - 1 ) checksum ^= buf[i];
}
if ( checksum == buf[buf[1] - 1] ) {
spi_port->transfer16(0xD0D0); // send confirmation
SPI_deassert(); return;
}
}
}
SPI_deassert(); return;
}
if ( wire_port != -1 ) {
begin_(I2C_SLAVE, (uint8_t)baudrate, 0, 0, 0, I2C_PULLUP_EXT, 100000, I2C_OP_MODE_ISR); return;
}
}
int SPI_MSTransfer::read(void) {
if ( _slave_access ) return -1;
if ( _serial_port_identifier != -1 ) {
uint16_t data[5], checksum = 0, data_pos = 0;
data[data_pos] = 0x3235; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0001; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = _serial_port_identifier; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = checksum;
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) spi_port->transfer16(data[i]);
if ( !command_ack_response(data, sizeof(data) / 2) ) return -1; // RECEIPT ACK
for ( uint16_t i = 0; i < 3000UL; i++ ) {
if ( spi_port->transfer16(0xFFFF) == 0xAA55 ) {
uint16_t buf[spi_port->transfer16(0xFFFF)]; buf[0] = 0xAA55; buf[1] = sizeof(buf) / 2; checksum = buf[0]; checksum ^= buf[1];
for ( uint16_t i = 2; i < buf[1]; i++ ) {
delayMicroseconds(_transfer_slowdown_while_reading);
buf[i] = spi_port->transfer16(0xFFFF);
if ( i < buf[1] - 1 ) checksum ^= buf[i];
}
if ( checksum == buf[buf[1] - 1] ) {
spi_port->transfer16(0xD0D0); // send confirmation
SPI_deassert(); return (int16_t)buf[2];
}
}
}
SPI_deassert(); return -1;
}
if ( wire_port != -1 ) {
if ( _wire_callback_active ) {
if ( _wire_callback_readpos >= mtsca.peek_front()[4] ) return -1;
uint8_t value = (uint8_t)mtsca.peek_front()[_wire_callback_readpos + 5];
_wire_callback_readpos++;
return value;
}
uint16_t data[5], checksum = 0, data_pos = 0;
data[data_pos] = 0x66AA; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0008; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = wire_port; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = checksum;
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) spi_port->transfer16(data[i]);
if ( !command_ack_response(data, sizeof(data) / 2) ) return 0; // RECEIPT ACK
for ( uint16_t i = 0; i < 3000UL; i++ ) {
if ( spi_port->transfer16(0xFFFF) == 0xAA55 ) {
uint16_t buf[spi_port->transfer16(0xFFFF)]; buf[0] = 0xAA55; buf[1] = sizeof(buf) / 2; checksum = buf[0]; checksum ^= buf[1];
for ( uint16_t i = 2; i < buf[1]; i++ ) {
delayMicroseconds(_transfer_slowdown_while_reading);
buf[i] = spi_port->transfer16(0xFFFF);
if ( i < buf[1] - 1 ) checksum ^= buf[i];
}
if ( checksum == buf[buf[1] - 1] ) {
spi_port->transfer16(0xD0D0); // send confirmation
SPI_deassert(); return (int16_t)buf[2];
}
}
}
SPI_deassert(); return 0;
}
return -1;
}
size_t SPI_MSTransfer::read(uint8_t* buffer, size_t size) {
if ( _slave_access ) return 0;
if ( wire_port != -1 ) {
if ( _wire_callback_active ) {
uint8_t _shift = mtsca.peek_front()[4] - available();
for ( uint16_t i = 0; i < size; i++ ) {
if ( _wire_callback_readpos >= mtsca.peek_front()[4] ) break;
buffer[i] = (uint8_t)mtsca.peek_front()[i + 5 + _shift];
_wire_callback_readpos++;
}
if ( size >= mtsca.peek_front()[4] ) return mtsca.peek_front()[4] - _shift;
return size;
}
uint16_t data[7], checksum = 0, data_pos = 0;
data[data_pos] = 0x66AA; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0022; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = wire_port; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = size >> 16; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = size; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = checksum;
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) spi_port->transfer16(data[i]);
if ( !command_ack_response(data, sizeof(data) / 2) ) return 0; // RECEIPT ACK
for ( uint16_t i = 0; i < 500; i++ ) {
if ( spi_port->transfer16(0xFFFF) == 0xAA55 ) {
uint16_t buf[spi_port->transfer16(0xFFFF)]; buf[0] = 0xAA55; buf[1] = sizeof(buf) / 2; checksum = buf[0]; checksum ^= buf[1];
for ( uint16_t i = 2; i < buf[1]; i++ ) {
delayMicroseconds(_transfer_slowdown_while_reading);
buf[i] = spi_port->transfer16(0xFFFF);
if ( i < buf[1] - 1 ) checksum ^= buf[i];
}
if ( checksum == buf[buf[1] - 1] ) {
for ( uint16_t i = 0; i < ((uint32_t)(buf[2] << 16) | buf[3]); i++ ) buffer[i] = (uint8_t)buf[i + 4];
spi_port->transfer16(0xD0D0); // send confirmation
SPI_deassert(); return ((uint32_t)(buf[2] << 16) | buf[3]);
}
}
}
SPI_deassert(); return 0;
}
return 0;
}
int SPI_MSTransfer::peek() {
if ( _slave_access ) return -1;
if ( _serial_port_identifier != -1 ) {
uint16_t data[5], checksum = 0, data_pos = 0;
data[data_pos] = 0x3235; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0003; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = _serial_port_identifier; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = checksum;
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) spi_port->transfer16(data[i]);
if ( !command_ack_response(data, sizeof(data) / 2) ) return -1; // RECEIPT ACK
for ( uint16_t i = 0; i < 3000UL; i++ ) {
if ( spi_port->transfer16(0xFFFF) == 0xAA55 ) {
uint16_t buf[spi_port->transfer16(0xFFFF)]; buf[0] = 0xAA55; buf[1] = sizeof(buf) / 2; checksum = buf[0]; checksum ^= buf[1];
for ( uint16_t i = 2; i < buf[1]; i++ ) {
delayMicroseconds(_transfer_slowdown_while_reading);
buf[i] = spi_port->transfer16(0xFFFF);
if ( i < buf[1] - 1 ) checksum ^= buf[i];
}
if ( checksum == buf[buf[1] - 1] ) {
spi_port->transfer16(0xD0D0); // send confirmation
SPI_deassert(); return (int16_t)buf[2];
}
}
}
SPI_deassert(); return -1;
}
if ( wire_port != -1 ) {
if ( _wire_callback_active ) {
if ( _wire_callback_readpos >= mtsca.peek_front()[4] ) return -1;
return (uint8_t)mtsca.peek_front()[_wire_callback_readpos + 5];
}
uint16_t data[5], checksum = 0, data_pos = 0;
data[data_pos] = 0x66AA; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0009; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = wire_port; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = checksum;
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) spi_port->transfer16(data[i]);
if ( !command_ack_response(data, sizeof(data) / 2) ) return 0; // RECEIPT ACK
for ( uint16_t i = 0; i < 3000UL; i++ ) {
if ( spi_port->transfer16(0xFFFF) == 0xAA55 ) {
uint16_t buf[spi_port->transfer16(0xFFFF)]; buf[0] = 0xAA55; buf[1] = sizeof(buf) / 2; checksum = buf[0]; checksum ^= buf[1];
for ( uint16_t i = 2; i < buf[1]; i++ ) {
delayMicroseconds(_transfer_slowdown_while_reading);
buf[i] = spi_port->transfer16(0xFFFF);
if ( i < buf[1] - 1 ) checksum ^= buf[i];
}
if ( checksum == buf[buf[1] - 1] ) {
spi_port->transfer16(0xD0D0); // send confirmation
SPI_deassert(); return (int16_t)buf[2];
}
}
}
SPI_deassert(); return 0;
}
return -1;
}
int SPI_MSTransfer::available(void) {
if ( _slave_access ) return 0;
if ( _serial_port_identifier != -1 ) {
uint16_t data[5], checksum = 0, data_pos = 0;
data[data_pos] = 0x3235; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0002; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = _serial_port_identifier; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = checksum;
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) spi_port->transfer16(data[i]);
if ( !command_ack_response(data, sizeof(data) / 2) ) return 0; // RECEIPT ACK
for ( uint16_t i = 0; i < 3000UL; i++ ) {
if ( spi_port->transfer16(0xFFFF) == 0xAA55 ) {
uint16_t buf[spi_port->transfer16(0xFFFF)]; buf[0] = 0xAA55; buf[1] = sizeof(buf) / 2; checksum = buf[0]; checksum ^= buf[1];
for ( uint16_t i = 2; i < buf[1]; i++ ) {
delayMicroseconds(_transfer_slowdown_while_reading);
buf[i] = spi_port->transfer16(0xFFFF);
if ( i < buf[1] - 1 ) checksum ^= buf[i];
}
if ( checksum == buf[buf[1] - 1] ) {
spi_port->transfer16(0xD0D0); // send confirmation
SPI_deassert(); return buf[2];
}
}
}
SPI_deassert(); return 0;
}
if ( wire_port != -1 ) {
if ( _wire_callback_active ) return mtsca.peek_front()[4] - _wire_callback_readpos;
uint16_t data[5], checksum = 0, data_pos = 0;
data[data_pos] = 0x66AA; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0007; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = wire_port; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = checksum;
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) spi_port->transfer16(data[i]);
if ( !command_ack_response(data, sizeof(data) / 2) ) return 0; // RECEIPT ACK
for ( uint16_t i = 0; i < 3000UL; i++ ) {
if ( spi_port->transfer16(0xFFFF) == 0xAA55 ) {
uint16_t buf[spi_port->transfer16(0xFFFF)]; buf[0] = 0xAA55; buf[1] = sizeof(buf) / 2; checksum = buf[0]; checksum ^= buf[1];
for ( uint16_t i = 2; i < buf[1]; i++ ) {
delayMicroseconds(_transfer_slowdown_while_reading);
buf[i] = spi_port->transfer16(0xFFFF);
if ( i < buf[1] - 1 ) checksum ^= buf[i];
}
if ( checksum == buf[buf[1] - 1] ) {
spi_port->transfer16(0xD0D0); // send confirmation
SPI_deassert(); return buf[2];
}
}
}
SPI_deassert(); return 0;
}
return 0;
}
size_t SPI_MSTransfer::write(const uint8_t *buf, size_t size) {
if ( _slave_access ) return 0;
if ( _serial_port_identifier != -1 ) {
uint16_t data[6 + size], checksum = 0, data_pos = 0;
data[data_pos] = 0x3235; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0004; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = _serial_port_identifier; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = size; checksum ^= data[data_pos]; data_pos++;
for ( uint16_t i = 0; i < size; i++ ) {
data[data_pos] = buf[i];
checksum ^= data[data_pos];
data_pos++;
}
data[data_pos] = checksum;
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) spi_port->transfer16(data[i]);
if ( !command_ack_response(data, sizeof(data) / 2) ) return 0; // RECEIPT ACK
for ( uint16_t i = 0; i < 3000UL; i++ ) {
if ( spi_port->transfer16(0xFFFF) == 0xAA55 ) {
uint16_t buf[spi_port->transfer16(0xFFFF)]; buf[0] = 0xAA55; buf[1] = sizeof(buf) / 2; checksum = buf[0]; checksum ^= buf[1];
for ( uint16_t i = 2; i < buf[1]; i++ ) {
delayMicroseconds(_transfer_slowdown_while_reading);
buf[i] = spi_port->transfer16(0xFFFF);
if ( i < buf[1] - 1 ) checksum ^= buf[i];
}
if ( checksum == buf[buf[1] - 1] ) {
spi_port->transfer16(0xD0D0); // send confirmation
SPI_deassert(); return buf[2];
}
}
}
SPI_deassert(); return 0;
}
if ( wire_port != -1 ) {
uint16_t data[6 + size], checksum = 0, data_pos = 0;
data[data_pos] = 0x66AA; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0005; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = wire_port; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = size; checksum ^= data[data_pos]; data_pos++;
for ( uint16_t i = 0; i < size; i++ ) {
data[data_pos] = buf[i];
checksum ^= data[data_pos];
data_pos++;
}
data[data_pos] = checksum;
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) spi_port->transfer16(data[i]);
if ( !command_ack_response(data, sizeof(data) / 2) ) return 0; // RECEIPT ACK
for ( uint16_t i = 0; i < 3000UL; i++ ) {
if ( spi_port->transfer16(0xFFFF) == 0xAA55 ) {
uint16_t buf[spi_port->transfer16(0xFFFF)]; buf[0] = 0xAA55; buf[1] = sizeof(buf) / 2; checksum = buf[0]; checksum ^= buf[1];
for ( uint16_t i = 2; i < buf[1]; i++ ) {
delayMicroseconds(_transfer_slowdown_while_reading);
buf[i] = spi_port->transfer16(0xFFFF);
if ( i < buf[1] - 1 ) checksum ^= buf[i];
}
if ( checksum == buf[buf[1] - 1] ) {
spi_port->transfer16(0xD0D0); // send confirmation
SPI_deassert(); return buf[2];
}
}
}
SPI_deassert(); return 0;
}
return 0;
}
void SPI_MSTransfer::flush() {
if ( _slave_access ) return;
if ( _serial_port_identifier != -1 ) {
uint16_t data[5], checksum = 0, data_pos = 0;
data[data_pos] = 0x3235; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0005; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = _serial_port_identifier; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = checksum;
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) spi_port->transfer16(data[i]);
if ( !command_ack_response(data, sizeof(data) / 2) ) return; // RECEIPT ACK
for ( uint16_t i = 0; i < 3000UL; i++ ) {
if ( spi_port->transfer16(0xFFFF) == 0xAA55 ) {
uint16_t buf[spi_port->transfer16(0xFFFF)]; buf[0] = 0xAA55; buf[1] = sizeof(buf) / 2; checksum = buf[0]; checksum ^= buf[1];
for ( uint16_t i = 2; i < buf[1]; i++ ) {
delayMicroseconds(_transfer_slowdown_while_reading);
buf[i] = spi_port->transfer16(0xFFFF);
if ( i < buf[1] - 1 ) checksum ^= buf[i];
}
if ( checksum == buf[buf[1] - 1] ) {
spi_port->transfer16(0xD0D0); // send confirmation
SPI_deassert(); return;
}
}
}
SPI_deassert(); return;
}
}
size_t SPI_MSTransfer::print(const char *p) {
if ( _slave_access ) return -1;
write(p, strlen(p));
return strlen(p);
}
size_t SPI_MSTransfer::println(const char *p) {
if ( _slave_access ) return -1;
char _text[strlen(p) + 1]; for ( uint16_t i = 0; i < strlen(p); i++ ) _text[i] = p[i]; _text[sizeof(_text) - 1] = '\n'; write(_text, sizeof(_text));
return strlen(p) + 1;
}
void SPI_MSTransfer::begin() {
if ( _slave_access ) {
// Better to initialize the ports outside the ISR, and before slave is activated.
//////// Pre-Set UART busses
Serial.begin(115200); // usb serial
NVIC_SET_PRIORITY(IRQ_USBOTG, 0);
Serial1.begin(115200); // 0+1
Serial2.begin(115200); // 9+10
Serial3.begin(115200); // 7+8
NVIC_SET_PRIORITY(IRQ_UART0_STATUS , 0);
NVIC_SET_PRIORITY(IRQ_UART1_STATUS , 0);
NVIC_SET_PRIORITY(IRQ_UART2_STATUS , 0);
#if defined(__MK64FX512__) || defined(__MK66FX1M0__)
Serial4.begin(115200); // 31+32
Serial5.begin(115200); // 33+34
Serial6.begin(115200); // 47+48
NVIC_SET_PRIORITY(IRQ_UART3_STATUS , 0);
NVIC_SET_PRIORITY(IRQ_UART4_STATUS , 0);
#endif
#if defined(__MK64FX512__)
NVIC_SET_PRIORITY(IRQ_UART5_STATUS, 0);
#endif
#if defined(__MK66FX1M0__)
NVIC_SET_PRIORITY(IRQ_LPUART0 , 0);
#endif
//////// Pre-Set Wire handlers, busses not set in case slave mode is required
Wire.onReceive(receiveEvent0);
#if defined(__MK64FX512__) || defined(__MK66FX1M0__)
Wire1.onReceive(receiveEvent1);
Wire2.onReceive(receiveEvent2);
#endif
#if defined(__MK66FX1M0__)
Wire3.onReceive(receiveEvent3);
#endif
//////// Pre-Set SPI busses
#if defined(__MK64FX512__) || defined(__MK66FX1M0__)
SPI1.setSCK(20); SPI1.setMOSI(21); SPI1.setMISO(5); SPI1.begin();
SPI2.setSCK(46); SPI2.setMOSI(44); SPI2.setMISO(45); SPI2.begin();
SPI1.beginTransaction(SPISettings(4000000, MSBFIRST, SPI_MODE0)); // default speed
SPI2.beginTransaction(SPISettings(4000000, MSBFIRST, SPI_MODE0)); // default speed
NVIC_SET_PRIORITY(IRQ_SPI1 , 0);
NVIC_SET_PRIORITY(IRQ_SPI2 , 0);
#endif
NVIC_SET_PRIORITY(IRQ_I2C0, 0);
#if defined(__MK64FX512__) || defined(__MK66FX1M0__)
NVIC_SET_PRIORITY(IRQ_I2C1, 0);
NVIC_SET_PRIORITY(IRQ_I2C2, 0);
#endif
#if defined(__MK66FX1M0__)
NVIC_SET_PRIORITY(IRQ_I2C3, 0);
#endif
SIM_SCGC6 |= SIM_SCGC6_SPI0; // enable slave clock
SPI0_MCR |= SPI_MCR_HALT | SPI_MCR_MDIS;
SPI0_MCR = 0x00000000;
SPI0_MCR &= ~SPI_MCR_HALT & ~SPI_MCR_MDIS;
SPI0_CTAR0_SLAVE = 0;
SPI0_MCR |= SPI_MCR_HALT | SPI_MCR_MDIS;
SPI0_CTAR0_SLAVE = SPI_CTAR_FMSZ(15);
SPI0_MCR &= ~SPI_MCR_HALT & ~SPI_MCR_MDIS;
SPI0_MCR |= SPI_MCR_HALT | SPI_MCR_MDIS;
SPI0_CTAR0_SLAVE = SPI0_CTAR0_SLAVE & ~(SPI_CTAR_CPOL | SPI_CTAR_CPHA) | 0x00 << 25;
SPI0_MCR &= ~SPI_MCR_HALT & ~SPI_MCR_MDIS;
SPI0_RSER = 0x00020000;
CORE_PIN14_CONFIG = PORT_PCR_MUX(2);
CORE_PIN11_CONFIG = PORT_PCR_DSE | PORT_PCR_MUX(2);
CORE_PIN12_CONFIG = PORT_PCR_MUX(2);
CORE_PIN2_CONFIG = PORT_PCR_PS | PORT_PCR_MUX(2); // this uses pin 2 for the CS so Serial2 can be used instead.
NVIC_SET_PRIORITY(IRQ_SPI0, 1); // set priority
NVIC_ENABLE_IRQ(IRQ_SPI0); // enable CS IRQ
pinMode(13, OUTPUT); // Enable LED use
/*
SIM_SCGC4 |= SIM_SCGC4_SPI0; // enable slave clock
SIM_SCGC5 |= SIM_SCGC5_PORTA_MASK|SIM_SCGC5_PORTB_MASK;
// disable SPI
SPI0_C1 &= ~SPI_C1_SPE_MASK;
// configure I/O to SPI function
PORTA_PCR5 &= ~PORT_PCR_MUX_MASK;
PORTA_PCR5 |= PORT_PCR_MUX(3)|PORT_PCR_DSE_MASK; //Use PTA5 as SPI0_SS_b
PORTA_PCR6 &= ~PORT_PCR_MUX_MASK;
PORTA_PCR6 |= PORT_PCR_MUX(3)|PORT_PCR_DSE_MASK; //Use PTA6 as SPI0_MISO
PORTA_PCR7 &= ~PORT_PCR_MUX_MASK;
PORTA_PCR7 |= PORT_PCR_MUX(3)|PORT_PCR_DSE_MASK; //Use PTA7 as SPI0_MOSI
PORTB_PCR0 &= ~PORT_PCR_MUX_MASK;
PORTB_PCR0 = PORT_PCR_MUX(3)|PORT_PCR_DSE_MASK; //Use PTB0 as SPI0_SCK
SPI0_C1 &= ~SPI_C1_MSTR_MASK;
SPI0_C1 |= SPI_C1_SSOE_MASK;
SPI0_C2 |= SPI_C2_MODFEN_MASK;
SPI0_C1 |= SPI_C1_CPHA_MASK;
SPI0_C1 &= (~SPI_C1_CPHA_MASK);
SPI0_C1 |= SPI_C1_CPOL_MASK;
SPI0_C1 &= (~SPI_C1_CPOL_MASK);
//SPI0_C1 |= SPI_C1_LSBFE_MASK;
SPI0_C1 &= (~SPI_C1_LSBFE_MASK);
// enable SPI_C1_RDRF interrupt in slave mode
SPI0_C1 |= SPI_C1_SPIE_MASK|SPI_C1_SPTIE_MASK;
enable_irq(10);
SPI0_C1 |= SPI_C1_SPE_MASK;
*/
}
if ( wire_port != -1 ) {
begin_(I2C_MASTER, 0, 0, 0, 0, I2C_PULLUP_EXT, 100000, I2C_OP_MODE_ISR); return;
}
if ( remote_spi_port != -1 ) {
uint16_t data[5], checksum = 0, data_pos = 0;
data[data_pos] = 0x6A7B; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0011; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = remote_spi_port; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = checksum;
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) spi_port->transfer16(data[i]);
if ( !command_ack_response(data, sizeof(data) / 2) ) return; // RECEIPT ACK
for ( uint16_t i = 0; i < 3000UL; i++ ) {
if ( spi_port->transfer16(0xFFFF) == 0xAA55 ) {
uint16_t buf[spi_port->transfer16(0xFFFF)]; buf[0] = 0xAA55; buf[1] = sizeof(buf) / 2; checksum = buf[0]; checksum ^= buf[1];
for ( uint16_t i = 2; i < buf[1]; i++ ) {
delayMicroseconds(_transfer_slowdown_while_reading);
buf[i] = spi_port->transfer16(0xFFFF);
if ( i < buf[1] - 1 ) checksum ^= buf[i];
}
if ( checksum == buf[buf[1] - 1] ) {
spi_port->transfer16(0xD0D0); // send confirmation
SPI_deassert(); return;
}
}
}
SPI_deassert(); return;
}
}
int SPI_MSTransfer::read(int addr) {
if ( _slave_access ) return -1;
if ( eeprom_support != -1 ) {
uint16_t data[5], checksum = 0, data_pos = 0;
data[data_pos] = 0x67BB; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0000; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = addr; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = checksum;
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) spi_port->transfer16(data[i]);
if ( !command_ack_response(data, sizeof(data) / 2) ) return -1; // RECEIPT ACK
for ( uint16_t i = 0; i < 3000UL; i++ ) {
if ( spi_port->transfer16(0xFFFF) == 0xAA55 ) {
uint16_t buf[spi_port->transfer16(0xFFFF)]; buf[0] = 0xAA55; buf[1] = sizeof(buf) / 2; checksum = buf[0]; checksum ^= buf[1];
for ( uint16_t i = 2; i < buf[1]; i++ ) {
delayMicroseconds(_transfer_slowdown_while_reading);
buf[i] = spi_port->transfer16(0xFFFF);
if ( i < buf[1] - 1 ) checksum ^= buf[i];
}
if ( checksum == buf[buf[1] - 1] ) {
spi_port->transfer16(0xD0D0); // send confirmation
SPI_deassert(); return (int16_t)buf[2];
}
}
}
SPI_deassert(); return -1;
}
return 0;
}
void SPI_MSTransfer::write(int addr, uint8_t value) {
if ( _slave_access ) return;
if ( eeprom_support != -1 ) {
uint16_t data[6], checksum = 0, data_pos = 0;
data[data_pos] = 0x67BB; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0001; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = addr; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = value; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = checksum;
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) spi_port->transfer16(data[i]);
if ( !command_ack_response(data, sizeof(data) / 2) ) return; // RECEIPT ACK
for ( uint16_t i = 0; i < 3000UL; i++ ) {
if ( spi_port->transfer16(0xFFFF) == 0xAA55 ) {
uint16_t buf[spi_port->transfer16(0xFFFF)]; buf[0] = 0xAA55; buf[1] = sizeof(buf) / 2; checksum = buf[0]; checksum ^= buf[1];
for ( uint16_t i = 2; i < buf[1]; i++ ) {
delayMicroseconds(_transfer_slowdown_while_reading);
buf[i] = spi_port->transfer16(0xFFFF);
if ( i < buf[1] - 1 ) checksum ^= buf[i];
}
if ( checksum == buf[buf[1] - 1] ) {
spi_port->transfer16(0xD0D0); // send confirmation
SPI_deassert();
}
}
}
SPI_deassert(); return;
}
}
void SPI_MSTransfer::update(int addr, uint8_t value) {
if ( _slave_access ) return;
if ( eeprom_support != -1 ) {
uint16_t data[6], checksum = 0, data_pos = 0;
data[data_pos] = 0x67BB; checksum ^= data[data_pos]; data_pos++; // HEADER
data[data_pos] = sizeof(data) / 2; checksum ^= data[data_pos]; data_pos++; // DATA SIZE
data[data_pos] = 0x0002; checksum ^= data[data_pos]; data_pos++; // SUB SWITCH STATEMENT
data[data_pos] = addr; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = value; checksum ^= data[data_pos]; data_pos++;
data[data_pos] = checksum;
SPI_assert();
for ( uint16_t i = 0; i < data[1]; i++ ) spi_port->transfer16(data[i]);
if ( !command_ack_response(data, sizeof(data) / 2) ) return; // RECEIPT ACK
for ( uint16_t i = 0; i < 3000UL; i++ ) {
if ( spi_port->transfer16(0xFFFF) == 0xAA55 ) {
uint16_t buf[spi_port->transfer16(0xFFFF)]; buf[0] = 0xAA55; buf[1] = sizeof(buf) / 2; checksum = buf[0]; checksum ^= buf[1];