1 files changed, 529 insertions, 0 deletions

diff --git a/platforms/avr/drivers/serial.c b/platforms/avr/drivers/serial.c
new file mode 100644
index 000000000..9a7345a53
--- /dev/null
+++ b/platforms/avr/drivers/serial.c
@@ -0,0 +1,529 @@
+/*
+ * WARNING: be careful changing this code, it is very timing dependent
+ *
+ * 2018-10-28 checked
+ *  avr-gcc 4.9.2
+ *  avr-gcc 5.4.0
+ *  avr-gcc 7.3.0
+ */
+
+#ifndef F_CPU
+#    define F_CPU 16000000
+#endif
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#include <stddef.h>
+#include <stdbool.h>
+#include "serial.h"
+
+#ifdef SOFT_SERIAL_PIN
+
+#    if !(defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB162__) || defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__) || defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
+#        error serial.c is not supported for the currently selected MCU
+#    endif
+// if using ATmega32U4/2, AT90USBxxx I2C, can not use PD0 and PD1 in soft serial.
+#    if defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__)
+#        if defined(USE_AVR_I2C) && (SOFT_SERIAL_PIN == D0 || SOFT_SERIAL_PIN == D1)
+#            error Using I2C, so can not use PD0, PD1
+#        endif
+#    endif
+// PD0..PD3, common config
+#    if SOFT_SERIAL_PIN == D0
+#        define EIMSK_BIT _BV(INT0)
+#        define EICRx_BIT (~(_BV(ISC00) | _BV(ISC01)))
+#        define SERIAL_PIN_INTERRUPT INT0_vect
+#        define EICRx EICRA
+#    elif SOFT_SERIAL_PIN == D1
+#        define EIMSK_BIT _BV(INT1)
+#        define EICRx_BIT (~(_BV(ISC10) | _BV(ISC11)))
+#        define SERIAL_PIN_INTERRUPT INT1_vect
+#        define EICRx EICRA
+#    elif SOFT_SERIAL_PIN == D2
+#        define EIMSK_BIT _BV(INT2)
+#        define EICRx_BIT (~(_BV(ISC20) | _BV(ISC21)))
+#        define SERIAL_PIN_INTERRUPT INT2_vect
+#        define EICRx EICRA
+#    elif SOFT_SERIAL_PIN == D3
+#        define EIMSK_BIT _BV(INT3)
+#        define EICRx_BIT (~(_BV(ISC30) | _BV(ISC31)))
+#        define SERIAL_PIN_INTERRUPT INT3_vect
+#        define EICRx EICRA
+#    endif
+
+// ATmegaxxU2/AT90USB162 specific config
+#    if defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__) || defined(__AVR_AT90USB162__)
+// PD4(INT5), PD6(INT6), PD7(INT7), PC7(INT4)
+#        if SOFT_SERIAL_PIN == D4
+#            define EIMSK_BIT _BV(INT5)
+#            define EICRx_BIT (~(_BV(ISC50) | _BV(ISC51)))
+#            define SERIAL_PIN_INTERRUPT INT5_vect
+#            define EICRx EICRB
+#        elif SOFT_SERIAL_PIN == D6
+#            define EIMSK_BIT _BV(INT6)
+#            define EICRx_BIT (~(_BV(ISC60) | _BV(ISC61)))
+#            define SERIAL_PIN_INTERRUPT INT6_vect
+#            define EICRx EICRB
+#        elif SOFT_SERIAL_PIN == D7
+#            define EIMSK_BIT _BV(INT7)
+#            define EICRx_BIT (~(_BV(ISC70) | _BV(ISC71)))
+#            define SERIAL_PIN_INTERRUPT INT7_vect
+#            define EICRx EICRB
+#        elif SOFT_SERIAL_PIN == C7
+#            define EIMSK_BIT _BV(INT4)
+#            define EICRx_BIT (~(_BV(ISC40) | _BV(ISC41)))
+#            define SERIAL_PIN_INTERRUPT INT4_vect
+#            define EICRx EICRB
+#        endif
+#    endif
+
+// ATmegaxxU4 specific config
+#    if defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__)
+// PE6(INT6)
+#        if SOFT_SERIAL_PIN == E6
+#            define EIMSK_BIT _BV(INT6)
+#            define EICRx_BIT (~(_BV(ISC60) | _BV(ISC61)))
+#            define SERIAL_PIN_INTERRUPT INT6_vect
+#            define EICRx EICRB
+#        endif
+#    endif
+
+// AT90USBxxx specific config
+#    if defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__)
+// PE4..PE7(INT4..INT7)
+#        if SOFT_SERIAL_PIN == E4
+#            define EIMSK_BIT _BV(INT4)
+#            define EICRx_BIT (~(_BV(ISC40) | _BV(ISC41)))
+#            define SERIAL_PIN_INTERRUPT INT4_vect
+#            define EICRx EICRB
+#        elif SOFT_SERIAL_PIN == E5
+#            define EIMSK_BIT _BV(INT5)
+#            define EICRx_BIT (~(_BV(ISC50) | _BV(ISC51)))
+#            define SERIAL_PIN_INTERRUPT INT5_vect
+#            define EICRx EICRB
+#        elif SOFT_SERIAL_PIN == E6
+#            define EIMSK_BIT _BV(INT6)
+#            define EICRx_BIT (~(_BV(ISC60) | _BV(ISC61)))
+#            define SERIAL_PIN_INTERRUPT INT6_vect
+#            define EICRx EICRB
+#        elif SOFT_SERIAL_PIN == E7
+#            define EIMSK_BIT _BV(INT7)
+#            define EICRx_BIT (~(_BV(ISC70) | _BV(ISC71)))
+#            define SERIAL_PIN_INTERRUPT INT7_vect
+#            define EICRx EICRB
+#        endif
+#    endif
+
+#    ifndef SERIAL_PIN_INTERRUPT
+#        error invalid SOFT_SERIAL_PIN value
+#    endif
+
+#    define setPinInputHigh(pin) (DDRx_ADDRESS(pin) &= ~_BV((pin)&0xF), PORTx_ADDRESS(pin) |= _BV((pin)&0xF))
+#    define setPinOutput(pin) (DDRx_ADDRESS(pin) |= _BV((pin)&0xF))
+#    define writePinHigh(pin) (PORTx_ADDRESS(pin) |= _BV((pin)&0xF))
+#    define writePinLow(pin) (PORTx_ADDRESS(pin) &= ~_BV((pin)&0xF))
+#    define readPin(pin) ((bool)(PINx_ADDRESS(pin) & _BV((pin)&0xF)))
+
+#    define ALWAYS_INLINE __attribute__((always_inline))
+#    define NO_INLINE __attribute__((noinline))
+#    define _delay_sub_us(x) __builtin_avr_delay_cycles(x)
+
+// parity check
+#    define ODD_PARITY 1
+#    define EVEN_PARITY 0
+#    define PARITY EVEN_PARITY
+
+#    ifdef SERIAL_DELAY
+// custom setup in config.h
+// #define TID_SEND_ADJUST 2
+// #define SERIAL_DELAY 6             // micro sec
+// #define READ_WRITE_START_ADJUST 30 // cycles
+// #define READ_WRITE_WIDTH_ADJUST 8 // cycles
+#    else
+// ============ Standard setups ============
+
+#        ifndef SELECT_SOFT_SERIAL_SPEED
+#            define SELECT_SOFT_SERIAL_SPEED 1
+//  0: about 189kbps (Experimental only)
+//  1: about 137kbps (default)
+//  2: about 75kbps
+//  3: about 39kbps
+//  4: about 26kbps
+//  5: about 20kbps
+#        endif
+
+#        if __GNUC__ < 6
+#            define TID_SEND_ADJUST 14
+#        else
+#            define TID_SEND_ADJUST 2
+#        endif
+
+#        if SELECT_SOFT_SERIAL_SPEED == 0
+// Very High speed
+#            define SERIAL_DELAY 4  // micro sec
+#            if __GNUC__ < 6
+#                define READ_WRITE_START_ADJUST 33  // cycles
+#                define READ_WRITE_WIDTH_ADJUST 3   // cycles
+#            else
+#                define READ_WRITE_START_ADJUST 34  // cycles
+#                define READ_WRITE_WIDTH_ADJUST 7   // cycles
+#            endif
+#        elif SELECT_SOFT_SERIAL_SPEED == 1
+// High speed
+#            define SERIAL_DELAY 6  // micro sec
+#            if __GNUC__ < 6
+#                define READ_WRITE_START_ADJUST 30  // cycles
+#                define READ_WRITE_WIDTH_ADJUST 3   // cycles
+#            else
+#                define READ_WRITE_START_ADJUST 33  // cycles
+#                define READ_WRITE_WIDTH_ADJUST 7   // cycles
+#            endif
+#        elif SELECT_SOFT_SERIAL_SPEED == 2
+// Middle speed
+#            define SERIAL_DELAY 12             // micro sec
+#            define READ_WRITE_START_ADJUST 30  // cycles
+#            if __GNUC__ < 6
+#                define READ_WRITE_WIDTH_ADJUST 3  // cycles
+#            else
+#                define READ_WRITE_WIDTH_ADJUST 7  // cycles
+#            endif
+#        elif SELECT_SOFT_SERIAL_SPEED == 3
+// Low speed
+#            define SERIAL_DELAY 24             // micro sec
+#            define READ_WRITE_START_ADJUST 30  // cycles
+#            if __GNUC__ < 6
+#                define READ_WRITE_WIDTH_ADJUST 3  // cycles
+#            else
+#                define READ_WRITE_WIDTH_ADJUST 7  // cycles
+#            endif
+#        elif SELECT_SOFT_SERIAL_SPEED == 4
+// Very Low speed
+#            define SERIAL_DELAY 36             // micro sec
+#            define READ_WRITE_START_ADJUST 30  // cycles
+#            if __GNUC__ < 6
+#                define READ_WRITE_WIDTH_ADJUST 3  // cycles
+#            else
+#                define READ_WRITE_WIDTH_ADJUST 7  // cycles
+#            endif
+#        elif SELECT_SOFT_SERIAL_SPEED == 5
+// Ultra Low speed
+#            define SERIAL_DELAY 48             // micro sec
+#            define READ_WRITE_START_ADJUST 30  // cycles
+#            if __GNUC__ < 6
+#                define READ_WRITE_WIDTH_ADJUST 3  // cycles
+#            else
+#                define READ_WRITE_WIDTH_ADJUST 7  // cycles
+#            endif
+#        else
+#            error invalid SELECT_SOFT_SERIAL_SPEED value
+#        endif /* SELECT_SOFT_SERIAL_SPEED */
+#    endif     /* SERIAL_DELAY */
+
+#    define SERIAL_DELAY_HALF1 (SERIAL_DELAY / 2)
+#    define SERIAL_DELAY_HALF2 (SERIAL_DELAY - SERIAL_DELAY / 2)
+
+#    define SLAVE_INT_WIDTH_US 1
+#    define SLAVE_INT_ACK_WIDTH_UNIT 2
+#    define SLAVE_INT_ACK_WIDTH 4
+
+inline static void serial_delay(void) ALWAYS_INLINE;
+inline static void serial_delay(void) { _delay_us(SERIAL_DELAY); }
+
+inline static void serial_delay_half1(void) ALWAYS_INLINE;
+inline static void serial_delay_half1(void) { _delay_us(SERIAL_DELAY_HALF1); }
+
+inline static void serial_delay_half2(void) ALWAYS_INLINE;
+inline static void serial_delay_half2(void) { _delay_us(SERIAL_DELAY_HALF2); }
+
+inline static void serial_output(void) ALWAYS_INLINE;
+inline static void serial_output(void) { setPinOutput(SOFT_SERIAL_PIN); }
+
+// make the serial pin an input with pull-up resistor
+inline static void serial_input_with_pullup(void) ALWAYS_INLINE;
+inline static void serial_input_with_pullup(void) { setPinInputHigh(SOFT_SERIAL_PIN); }
+
+inline static uint8_t serial_read_pin(void) ALWAYS_INLINE;
+inline static uint8_t serial_read_pin(void) { return !!readPin(SOFT_SERIAL_PIN); }
+
+inline static void serial_low(void) ALWAYS_INLINE;
+inline static void serial_low(void) { writePinLow(SOFT_SERIAL_PIN); }
+
+inline static void serial_high(void) ALWAYS_INLINE;
+inline static void serial_high(void) { writePinHigh(SOFT_SERIAL_PIN); }
+
+void soft_serial_initiator_init(void) {
+    serial_output();
+    serial_high();
+}
+
+void soft_serial_target_init(void) {
+    serial_input_with_pullup();
+
+    // Enable INT0-INT7
+    EIMSK |= EIMSK_BIT;
+    EICRx &= EICRx_BIT;
+}
+
+// Used by the sender to synchronize timing with the reciver.
+static void sync_recv(void) NO_INLINE;
+static void sync_recv(void) {
+    for (uint8_t i = 0; i < SERIAL_DELAY * 5 && serial_read_pin(); i++) {
+    }
+    // This shouldn't hang if the target disconnects because the
+    // serial line will float to high if the target does disconnect.
+    while (!serial_read_pin())
+        ;
+}
+
+// Used by the reciver to send a synchronization signal to the sender.
+static void sync_send(void) NO_INLINE;
+static void sync_send(void) {
+    serial_low();
+    serial_delay();
+    serial_high();
+}
+
+// Reads a byte from the serial line
+static uint8_t serial_read_chunk(uint8_t *pterrcount, uint8_t bit) NO_INLINE;
+static uint8_t serial_read_chunk(uint8_t *pterrcount, uint8_t bit) {
+    uint8_t byte, i, p, pb;
+
+    _delay_sub_us(READ_WRITE_START_ADJUST);
+    for (i = 0, byte = 0, p = PARITY; i < bit; i++) {
+        serial_delay_half1();  // read the middle of pulses
+        if (serial_read_pin()) {
+            byte = (byte << 1) | 1;
+            p ^= 1;
+        } else {
+            byte = (byte << 1) | 0;
+            p ^= 0;
+        }
+        _delay_sub_us(READ_WRITE_WIDTH_ADJUST);
+        serial_delay_half2();
+    }
+    /* recive parity bit */
+    serial_delay_half1();  // read the middle of pulses
+    pb = serial_read_pin();
+    _delay_sub_us(READ_WRITE_WIDTH_ADJUST);
+    serial_delay_half2();
+
+    *pterrcount += (p != pb) ? 1 : 0;
+
+    return byte;
+}
+
+// Sends a byte with MSB ordering
+void serial_write_chunk(uint8_t data, uint8_t bit) NO_INLINE;
+void serial_write_chunk(uint8_t data, uint8_t bit) {
+    uint8_t b, p;
+    for (p = PARITY, b = 1 << (bit - 1); b; b >>= 1) {
+        if (data & b) {
+            serial_high();
+            p ^= 1;
+        } else {
+            serial_low();
+            p ^= 0;
+        }
+        serial_delay();
+    }
+    /* send parity bit */
+    if (p & 1) {
+        serial_high();
+    } else {
+        serial_low();
+    }
+    serial_delay();
+
+    serial_low();  // sync_send() / senc_recv() need raise edge
+}
+
+static void serial_send_packet(uint8_t *buffer, uint8_t size) NO_INLINE;
+static void serial_send_packet(uint8_t *buffer, uint8_t size) {
+    for (uint8_t i = 0; i < size; ++i) {
+        uint8_t data;
+        data = buffer[i];
+        sync_send();
+        serial_write_chunk(data, 8);
+    }
+}
+
+static uint8_t serial_recive_packet(uint8_t *buffer, uint8_t size) NO_INLINE;
+static uint8_t serial_recive_packet(uint8_t *buffer, uint8_t size) {
+    uint8_t pecount = 0;
+    for (uint8_t i = 0; i < size; ++i) {
+        uint8_t data;
+        sync_recv();
+        data      = serial_read_chunk(&pecount, 8);
+        buffer[i] = data;
+    }
+    return pecount == 0;
+}
+
+inline static void change_sender2reciver(void) {
+    sync_send();                 // 0
+    serial_delay_half1();        // 1
+    serial_low();                // 2
+    serial_input_with_pullup();  // 2
+    serial_delay_half1();        // 3
+}
+
+inline static void change_reciver2sender(void) {
+    sync_recv();           // 0
+    serial_delay();        // 1
+    serial_low();          // 3
+    serial_output();       // 3
+    serial_delay_half1();  // 4
+}
+
+static inline uint8_t nibble_bits_count(uint8_t bits) {
+    bits = (bits & 0x5) + (bits >> 1 & 0x5);
+    bits = (bits & 0x3) + (bits >> 2 & 0x3);
+    return bits;
+}
+
+// interrupt handle to be used by the target device
+ISR(SERIAL_PIN_INTERRUPT) {
+    // recive transaction table index
+    uint8_t tid, bits;
+    uint8_t pecount = 0;
+    sync_recv();
+    bits = serial_read_chunk(&pecount, 8);
+    tid  = bits >> 3;
+    bits = (bits & 7) != (nibble_bits_count(tid) & 7);
+    if (bits || pecount > 0 || tid > NUM_TOTAL_TRANSACTIONS) {
+        return;
+    }
+    serial_delay_half1();
+
+    serial_high();  // response step1 low->high
+    serial_output();
+    _delay_sub_us(SLAVE_INT_ACK_WIDTH_UNIT * SLAVE_INT_ACK_WIDTH);
+    split_transaction_desc_t *trans = &split_transaction_table[tid];
+    serial_low();  // response step2 ack high->low
+
+    // If the transaction has a callback, we can execute it now
+    if (trans->slave_callback) {
+        trans->slave_callback(trans->initiator2target_buffer_size, split_trans_initiator2target_buffer(trans), trans->target2initiator_buffer_size, split_trans_target2initiator_buffer(trans));
+    }
+
+    // target send phase
+    if (trans->target2initiator_buffer_size > 0) serial_send_packet((uint8_t *)split_trans_target2initiator_buffer(trans), trans->target2initiator_buffer_size);
+    // target switch to input
+    change_sender2reciver();
+
+    // target recive phase
+    if (trans->initiator2target_buffer_size > 0) {
+        if (serial_recive_packet((uint8_t *)split_trans_initiator2target_buffer(trans), trans->initiator2target_buffer_size)) {
+            *trans->status = TRANSACTION_ACCEPTED;
+        } else {
+            *trans->status = TRANSACTION_DATA_ERROR;
+        }
+    } else {
+        *trans->status = TRANSACTION_ACCEPTED;
+    }
+
+    sync_recv();  // weit initiator output to high
+}
+
+/////////
+//  start transaction by initiator
+//
+// int  soft_serial_transaction(int sstd_index)
+//
+// Returns:
+//    TRANSACTION_END
+//    TRANSACTION_NO_RESPONSE
+//    TRANSACTION_DATA_ERROR
+// this code is very time dependent, so we need to disable interrupts
+int soft_serial_transaction(int sstd_index) {
+    if (sstd_index > NUM_TOTAL_TRANSACTIONS) return TRANSACTION_TYPE_ERROR;
+    split_transaction_desc_t *trans = &split_transaction_table[sstd_index];
+
+    if (!trans->status) return TRANSACTION_TYPE_ERROR;  // not registered
+
+    cli();
+
+    // signal to the target that we want to start a transaction
+    serial_output();
+    serial_low();
+    _delay_us(SLAVE_INT_WIDTH_US);
+
+    // send transaction table index
+    int tid = (sstd_index << 3) | (7 & nibble_bits_count(sstd_index));
+    sync_send();
+    _delay_sub_us(TID_SEND_ADJUST);
+    serial_write_chunk(tid, 8);
+    serial_delay_half1();
+
+    // wait for the target response (step1 low->high)
+    serial_input_with_pullup();
+    while (!serial_read_pin()) {
+        _delay_sub_us(2);
+    }
+
+    // check if the target is present (step2 high->low)
+    for (int i = 0; serial_read_pin(); i++) {
+        if (i > SLAVE_INT_ACK_WIDTH + 1) {
+            // slave failed to pull the line low, assume not present
+            serial_output();
+            serial_high();
+            *trans->status = TRANSACTION_NO_RESPONSE;
+            sei();
+            return TRANSACTION_NO_RESPONSE;
+        }
+        _delay_sub_us(SLAVE_INT_ACK_WIDTH_UNIT);
+    }
+
+    // initiator recive phase
+    // if the target is present syncronize with it
+    if (trans->target2initiator_buffer_size > 0) {
+        if (!serial_recive_packet((uint8_t *)split_trans_target2initiator_buffer(trans), trans->target2initiator_buffer_size)) {
+            serial_output();
+            serial_high();
+            *trans->status = TRANSACTION_DATA_ERROR;
+            sei();
+            return TRANSACTION_DATA_ERROR;
+        }
+    }
+
+    // initiator switch to output
+    change_reciver2sender();
+
+    // initiator send phase
+    if (trans->initiator2target_buffer_size > 0) {
+        serial_send_packet((uint8_t *)split_trans_initiator2target_buffer(trans), trans->initiator2target_buffer_size);
+    }
+
+    // always, release the line when not in use
+    sync_send();
+
+    *trans->status = TRANSACTION_END;
+    sei();
+    return TRANSACTION_END;
+}
+
+int soft_serial_get_and_clean_status(int sstd_index) {
+    split_transaction_desc_t *trans = &split_transaction_table[sstd_index];
+    cli();
+    int retval     = *trans->status;
+    *trans->status = 0;
+    ;
+    sei();
+    return retval;
+}
+#endif
+
+// Helix serial.c history
+//   2018-1-29 fork from let's split and add PD2, modify sync_recv() (#2308, bceffdefc)
+//   2018-6-28 bug fix master to slave comm and speed up (#3255, 1038bbef4)
+//             (adjusted with avr-gcc 4.9.2)
+//   2018-7-13 remove USE_SERIAL_PD2 macro (#3374, f30d6dd78)
+//             (adjusted with avr-gcc 4.9.2)
+//   2018-8-11 add support multi-type transaction (#3608, feb5e4aae)
+//             (adjusted with avr-gcc 4.9.2)
+//   2018-10-21 fix serial and RGB animation conflict (#4191, 4665e4fff)
+//             (adjusted with avr-gcc 7.3.0)
+//   2018-10-28 re-adjust compiler depend value of delay (#4269, 8517f8a66)
+//             (adjusted with avr-gcc 5.4.0, 7.3.0)
+//   2018-12-17 copy to TOP/quantum/split_common/ and remove backward compatibility code (#4669)