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Diffstat (limited to 'keyboards/zinc/serial.c')
| -rw-r--r-- | keyboards/zinc/serial.c | 542 |
1 files changed, 542 insertions, 0 deletions
diff --git a/keyboards/zinc/serial.c b/keyboards/zinc/serial.c new file mode 100644 index 0000000000..830f86b55a --- /dev/null +++ b/keyboards/zinc/serial.c @@ -0,0 +1,542 @@ +/* + * WARNING: be careful changing this code, it is very timing dependent + */ + +#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" +//#include <pro_micro.h> + +#ifdef SOFT_SERIAL_PIN + +#ifdef __AVR_ATmega32U4__ + // if using ATmega32U4 I2C, can not use PD0 and PD1 in soft serial. + #ifdef USE_I2C + #if SOFT_SERIAL_PIN == D0 || SOFT_SERIAL_PIN == D1 + #error Using ATmega32U4 I2C, so can not use PD0, PD1 + #endif + #endif + + #if SOFT_SERIAL_PIN >= D0 && SOFT_SERIAL_PIN <= D3 + #define SERIAL_PIN_DDR DDRD + #define SERIAL_PIN_PORT PORTD + #define SERIAL_PIN_INPUT PIND + #if SOFT_SERIAL_PIN == D0 + #define SERIAL_PIN_MASK _BV(PD0) + #define EIMSK_BIT _BV(INT0) + #define EICRx_BIT (~(_BV(ISC00) | _BV(ISC01))) + #define SERIAL_PIN_INTERRUPT INT0_vect + #elif SOFT_SERIAL_PIN == D1 + #define SERIAL_PIN_MASK _BV(PD1) + #define EIMSK_BIT _BV(INT1) + #define EICRx_BIT (~(_BV(ISC10) | _BV(ISC11))) + #define SERIAL_PIN_INTERRUPT INT1_vect + #elif SOFT_SERIAL_PIN == D2 + #define SERIAL_PIN_MASK _BV(PD2) + #define EIMSK_BIT _BV(INT2) + #define EICRx_BIT (~(_BV(ISC20) | _BV(ISC21))) + #define SERIAL_PIN_INTERRUPT INT2_vect + #elif SOFT_SERIAL_PIN == D3 + #define SERIAL_PIN_MASK _BV(PD3) + #define EIMSK_BIT _BV(INT3) + #define EICRx_BIT (~(_BV(ISC30) | _BV(ISC31))) + #define SERIAL_PIN_INTERRUPT INT3_vect + #endif + #elif SOFT_SERIAL_PIN == E6 + #define SERIAL_PIN_DDR DDRE + #define SERIAL_PIN_PORT PORTE + #define SERIAL_PIN_INPUT PINE + #define SERIAL_PIN_MASK _BV(PE6) + #define EIMSK_BIT _BV(INT6) + #define EICRx_BIT (~(_BV(ISC60) | _BV(ISC61))) + #define SERIAL_PIN_INTERRUPT INT6_vect + #else + #error invalid SOFT_SERIAL_PIN value + #endif + +#else + #error serial.c now support ATmega32U4 only +#endif + +#ifndef SERIAL_USE_MULTI_TRANSACTION +/* --- USE Simple API (OLD API, compatible with let's split serial.c) */ + #if SERIAL_SLAVE_BUFFER_LENGTH > 0 + uint8_t volatile serial_slave_buffer[SERIAL_SLAVE_BUFFER_LENGTH] = {0}; + #endif + #if SERIAL_MASTER_BUFFER_LENGTH > 0 + uint8_t volatile serial_master_buffer[SERIAL_MASTER_BUFFER_LENGTH] = {0}; + #endif + uint8_t volatile status0 = 0; + +SSTD_t transactions[] = { + { (uint8_t *)&status0, + #if SERIAL_MASTER_BUFFER_LENGTH > 0 + sizeof(serial_master_buffer), (uint8_t *)serial_master_buffer, + #else + 0, (uint8_t *)NULL, + #endif + #if SERIAL_SLAVE_BUFFER_LENGTH > 0 + sizeof(serial_slave_buffer), (uint8_t *)serial_slave_buffer + #else + 0, (uint8_t *)NULL, + #endif + } +}; + +void serial_master_init(void) +{ soft_serial_initiator_init(transactions, TID_LIMIT(transactions)); } + +void serial_slave_init(void) +{ soft_serial_target_init(transactions, TID_LIMIT(transactions)); } + +// 0 => no error +// 1 => slave did not respond +// 2 => checksum error +int serial_update_buffers() +{ + int result; + result = soft_serial_transaction(); + return result; +} + +#endif // Simple API (OLD API, compatible with let's split serial.c) + +#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 +// 1: about 137kbps (default) +// 2: about 75kbps +// 3: about 39kbps +// 4: about 26kbps +// 5: about 20kbps +#endif + +#define TID_SEND_ADJUST 2 + +#if SELECT_SOFT_SERIAL_SPEED == 0 + // Very High speed + #define SERIAL_DELAY 4 // micro sec + #define READ_WRITE_START_ADJUST 33 // cycles + #define READ_WRITE_WIDTH_ADJUST 6 // cycles +#elif SELECT_SOFT_SERIAL_SPEED == 1 + // High speed + #define SERIAL_DELAY 6 // micro sec + #define READ_WRITE_START_ADJUST 30 // cycles + #define READ_WRITE_WIDTH_ADJUST 7 // cycles +#elif SELECT_SOFT_SERIAL_SPEED == 2 + // Middle speed + #define SERIAL_DELAY 12 // micro sec + #define READ_WRITE_START_ADJUST 30 // cycles + #define READ_WRITE_WIDTH_ADJUST 7 // cycles +#elif SELECT_SOFT_SERIAL_SPEED == 3 + // Low speed + #define SERIAL_DELAY 24 // micro sec + #define READ_WRITE_START_ADJUST 30 // cycles + #define READ_WRITE_WIDTH_ADJUST 7 // cycles +#elif SELECT_SOFT_SERIAL_SPEED == 4 + // Very Low speed + #define SERIAL_DELAY 36 // micro sec + #define READ_WRITE_START_ADJUST 30 // cycles + #define READ_WRITE_WIDTH_ADJUST 7 // cycles +#elif SELECT_SOFT_SERIAL_SPEED == 5 + // Ultra Low speed + #define SERIAL_DELAY 48 // micro sec + #define READ_WRITE_START_ADJUST 30 // cycles + #define READ_WRITE_WIDTH_ADJUST 7 // cycles +#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 +#ifndef SERIAL_USE_MULTI_TRANSACTION + #define SLAVE_INT_RESPONSE_TIME SERIAL_DELAY +#else + #define SLAVE_INT_ACK_WIDTH_UNIT 2 + #define SLAVE_INT_ACK_WIDTH 4 +#endif + +static SSTD_t *Transaction_table = NULL; +static uint8_t Transaction_table_size = 0; + +inline static +void serial_delay(void) { + _delay_us(SERIAL_DELAY); +} + +inline static +void serial_delay_half1(void) { + _delay_us(SERIAL_DELAY_HALF1); +} + +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) { + SERIAL_PIN_DDR |= SERIAL_PIN_MASK; +} + +// 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) { + SERIAL_PIN_DDR &= ~SERIAL_PIN_MASK; + SERIAL_PIN_PORT |= SERIAL_PIN_MASK; +} + +inline static +uint8_t serial_read_pin(void) { + return !!(SERIAL_PIN_INPUT & SERIAL_PIN_MASK); +} + +inline static void serial_low(void) ALWAYS_INLINE; +inline static +void serial_low(void) { + SERIAL_PIN_PORT &= ~SERIAL_PIN_MASK; +} + +inline static void serial_high(void) ALWAYS_INLINE; +inline static +void serial_high(void) { + SERIAL_PIN_PORT |= SERIAL_PIN_MASK; +} + +void soft_serial_initiator_init(SSTD_t *sstd_table, int sstd_table_size) +{ + Transaction_table = sstd_table; + Transaction_table_size = (uint8_t)sstd_table_size; + serial_output(); + serial_high(); +} + +void soft_serial_target_init(SSTD_t *sstd_table, int sstd_table_size) +{ + Transaction_table = sstd_table; + Transaction_table_size = (uint8_t)sstd_table_size; + serial_input_with_pullup(); + + // Enable INT0-INT3,INT6 + EIMSK |= EIMSK_BIT; +#if SERIAL_PIN_MASK == _BV(PE6) + // Trigger on falling edge of INT6 + EICRB &= EICRx_BIT; +#else + // Trigger on falling edge of INT0-INT3 + EICRA &= EICRx_BIT; +#endif +} + +// 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) { + +#ifndef SERIAL_USE_MULTI_TRANSACTION + serial_low(); + serial_output(); + SSTD_t *trans = Transaction_table; +#else + // recive transaction table index + uint8_t tid, bits; + uint8_t pecount = 0; + sync_recv(); + bits = serial_read_chunk(&pecount,7); + tid = bits>>3; + bits = (bits&7) != nibble_bits_count(tid); + if( bits || pecount> 0 || tid > Transaction_table_size ) { + return; + } + serial_delay_half1(); + + serial_high(); // response step1 low->high + serial_output(); + _delay_sub_us(SLAVE_INT_ACK_WIDTH_UNIT*SLAVE_INT_ACK_WIDTH); + SSTD_t *trans = &Transaction_table[tid]; + serial_low(); // response step2 ack high->low +#endif + + // target send phase + if( trans->target2initiator_buffer_size > 0 ) + serial_send_packet((uint8_t *)trans->target2initiator_buffer, + 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 *)trans->initiator2target_buffer, + 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 +#ifndef SERIAL_USE_MULTI_TRANSACTION +int soft_serial_transaction(void) { + SSTD_t *trans = Transaction_table; +#else +int soft_serial_transaction(int sstd_index) { + if( sstd_index > Transaction_table_size ) + return TRANSACTION_TYPE_ERROR; + SSTD_t *trans = &Transaction_table[sstd_index]; +#endif + cli(); + + // signal to the target that we want to start a transaction + serial_output(); + serial_low(); + _delay_us(SLAVE_INT_WIDTH_US); + +#ifndef SERIAL_USE_MULTI_TRANSACTION + // wait for the target response + serial_input_with_pullup(); + _delay_us(SLAVE_INT_RESPONSE_TIME); + + // check if the target is present + if (serial_read_pin()) { + // target failed to pull the line low, assume not present + serial_output(); + serial_high(); + *trans->status = TRANSACTION_NO_RESPONSE; + sei(); + return TRANSACTION_NO_RESPONSE; + } + +#else + // 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, 7); + 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); + } +#endif + + // initiator recive phase + // if the target is present syncronize with it + if( trans->target2initiator_buffer_size > 0 ) { + if (!serial_recive_packet((uint8_t *)trans->target2initiator_buffer, + 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 *)trans->initiator2target_buffer, + trans->initiator2target_buffer_size); + } + + // always, release the line when not in use + sync_send(); + + *trans->status = TRANSACTION_END; + sei(); + return TRANSACTION_END; +} + +#ifdef SERIAL_USE_MULTI_TRANSACTION +int soft_serial_get_and_clean_status(int sstd_index) { + SSTD_t *trans = &Transaction_table[sstd_index]; + cli(); + int retval = *trans->status; + *trans->status = 0;; + sei(); + return retval; +} +#endif + +#endif + +// Helix serial.c history +// 2018-1-29 fork from let's split (#2308) +// 2018-6-28 bug fix master to slave comm (#3255) +// 2018-8-11 improvements (#3608) +// 2018-10-21 fix serial and RGB animation conflict (#4191) |