#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 USE_SERIAL
+
+#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); }
-#ifndef USE_I2C
+void serial_slave_init(void)
+{ soft_serial_target_init(transactions); }
-// Serial pulse period in microseconds. Its probably a bad idea to lower this
-// value.
-#define SERIAL_DELAY 24
+// 0 => no error
+// 1 => slave did not respond
+// 2 => checksum error
+int serial_update_buffers()
+{ return soft_serial_transaction(); }
+
+#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)
+
+// Serial pulse period in microseconds.
+#define TID_SEND_ADJUST 14
+
+#define SELECT_SERIAL_SPEED 1
+#if SELECT_SERIAL_SPEED == 0
+ // Very High speed
+ #define SERIAL_DELAY 4 // micro sec
+ #define READ_WRITE_START_ADJUST 33 // cycles
+ #define READ_WRITE_WIDTH_ADJUST 3 // cycles
+#elif SELECT_SERIAL_SPEED == 1
+ // High speed
+ #define SERIAL_DELAY 6 // micro sec
+ #define READ_WRITE_START_ADJUST 30 // cycles
+ #define READ_WRITE_WIDTH_ADJUST 3 // cycles
+#elif SELECT_SERIAL_SPEED == 2
+ // Middle speed
+ #define SERIAL_DELAY 12 // micro sec
+ #define READ_WRITE_START_ADJUST 30 // cycles
+ #define READ_WRITE_WIDTH_ADJUST 3 // cycles
+#elif SELECT_SERIAL_SPEED == 3
+ // Low speed
+ #define SERIAL_DELAY 24 // micro sec
+ #define READ_WRITE_START_ADJUST 30 // cycles
+ #define READ_WRITE_WIDTH_ADJUST 3 // cycles
+#elif SELECT_SERIAL_SPEED == 4
+ // Very Low speed
+ #define SERIAL_DELAY 50 // micro sec
+ #define READ_WRITE_START_ADJUST 30 // cycles
+ #define READ_WRITE_WIDTH_ADJUST 3 // cycles
+#else
+#error Illegal Serial Speed
+#endif
-uint8_t volatile serial_slave_buffer[SERIAL_SLAVE_BUFFER_LENGTH] = {0};
-uint8_t volatile serial_master_buffer[SERIAL_MASTER_BUFFER_LENGTH] = {0};
-#define SLAVE_DATA_CORRUPT (1<<0)
-volatile uint8_t status = 0;
+#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;
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(void) {
+void serial_input_with_pullup(void) {
SERIAL_PIN_DDR &= ~SERIAL_PIN_MASK;
SERIAL_PIN_PORT |= SERIAL_PIN_MASK;
}
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 serial_master_init(void) {
- serial_output();
- serial_high();
+void soft_serial_initiator_init(SSTD_t *sstd_table)
+{
+ Transaction_table = sstd_table;
+ serial_output();
+ serial_high();
}
-void serial_slave_init(void) {
- serial_input();
-
-#ifndef USE_SERIAL_PD2
- // Enable INT0
- EIMSK |= _BV(INT0);
- // Trigger on falling edge of INT0
- EICRA &= ~(_BV(ISC00) | _BV(ISC01));
+void soft_serial_target_init(SSTD_t *sstd_table)
+{
+ Transaction_table = sstd_table;
+ serial_input_with_pullup();
+
+#if SERIAL_PIN_MASK == _BV(PD0)
+ // Enable INT0
+ EIMSK |= _BV(INT0);
+ // Trigger on falling edge of INT0
+ EICRA &= ~(_BV(ISC00) | _BV(ISC01));
+#elif SERIAL_PIN_MASK == _BV(PD2)
+ // Enable INT2
+ EIMSK |= _BV(INT2);
+ // Trigger on falling edge of INT2
+ EICRA &= ~(_BV(ISC20) | _BV(ISC21));
#else
- // Enable INT2
- EIMSK |= _BV(INT2);
- // Trigger on falling edge of INT2
- EICRA &= ~(_BV(ISC20) | _BV(ISC21));
+ #error unknown SERIAL_PIN_MASK value
#endif
}
-// Used by the master to synchronize timing with the slave.
+// Used by the sender to synchronize timing with the reciver.
+static void sync_recv(void) NO_INLINE;
static
void sync_recv(void) {
- serial_input();
- // This shouldn't hang if the slave disconnects because the
- // serial line will float to high if the slave does disconnect.
+ 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());
- serial_delay();
}
-// Used by the slave to send a synchronization signal to the master.
+// 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_output();
-
serial_low();
serial_delay();
-
serial_high();
}
// Reads a byte from the serial line
-static
-uint8_t serial_read_byte(void) {
- uint8_t byte = 0;
- serial_input();
- for ( uint8_t i = 0; i < 8; ++i) {
- byte = (byte << 1) | serial_read_pin();
- serial_delay();
- _delay_us(1);
+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 = 0; 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
-static
-void serial_write_byte(uint8_t data) {
- uint8_t b = 8;
- serial_output();
- while( b-- ) {
- if(data & (1 << b)) {
- serial_high();
- } else {
- serial_low();
+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 = 0, 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();
- }
-}
-// interrupt handle to be used by the slave device
-ISR(SERIAL_PIN_INTERRUPT) {
- sync_send();
+ serial_low(); // sync_send() / senc_recv() need raise edge
+}
- uint8_t checksum = 0;
- for (int i = 0; i < SERIAL_SLAVE_BUFFER_LENGTH; ++i) {
- serial_write_byte(serial_slave_buffer[i]);
+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();
- checksum += serial_slave_buffer[i];
+ serial_write_chunk(data,8);
}
- serial_write_byte(checksum);
- sync_send();
+}
- // wait for the sync to finish sending
- serial_delay();
+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;
+}
- // read the middle of pulses
- _delay_us(SERIAL_DELAY/2);
+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
+}
- uint8_t checksum_computed = 0;
- for (int i = 0; i < SERIAL_MASTER_BUFFER_LENGTH; ++i) {
- serial_master_buffer[i] = serial_read_byte();
- sync_send();
- checksum_computed += serial_master_buffer[i];
- }
- uint8_t checksum_received = serial_read_byte();
- sync_send();
+inline static
+void change_reciver2sender(void) {
+ sync_recv(); //0
+ serial_delay(); //1
+ serial_low(); //3
+ serial_output(); //3
+ serial_delay_half1(); //4
+}
- serial_input(); // end transaction
+// interrupt handle to be used by the target device
+ISR(SERIAL_PIN_INTERRUPT) {
- if ( checksum_computed != checksum_received ) {
- status |= SLAVE_DATA_CORRUPT;
+#ifndef SERIAL_USE_MULTI_TRANSACTION
+ serial_low();
+ serial_output();
+ SSTD_t *trans = Transaction_table;
+#else
+ // recive transaction table index
+ uint8_t tid;
+ uint8_t pecount = 0;
+ sync_recv();
+ tid = serial_read_chunk(&pecount,4);
+ if(pecount> 0)
+ 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 {
- status &= ~SLAVE_DATA_CORRUPT;
+ *trans->status = TRANSACTION_ACCEPTED;
}
-}
-inline
-bool serial_slave_DATA_CORRUPT(void) {
- return status & SLAVE_DATA_CORRUPT;
+ sync_recv(); //weit initiator output to high
}
-// Copies the serial_slave_buffer to the master and sends the
-// serial_master_buffer to the slave.
+/////////
+// start transaction by initiator
+//
+// int soft_serial_transaction(int sstd_index)
//
// Returns:
-// 0 => no error
-// 1 => slave did not respond
-int serial_update_buffers(void) {
- // this code is very time dependent, so we need to disable interrupts
+// 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) {
+ SSTD_t *trans = &Transaction_table[sstd_index];
+#endif
cli();
- // signal to the slave that we want to start a transaction
+ // signal to the target that we want to start a transaction
serial_output();
serial_low();
- _delay_us(1);
+ _delay_us(SLAVE_INT_WIDTH_US);
- // wait for the slaves response
- serial_input();
- serial_high();
- _delay_us(SERIAL_DELAY);
+#ifndef SERIAL_USE_MULTI_TRANSACTION
+ // wait for the target response
+ serial_input_with_pullup();
+ _delay_us(SLAVE_INT_RESPONSE_TIME);
- // check if the slave is present
+ // check if the target is present
if (serial_read_pin()) {
- // slave failed to pull the line low, assume not present
+ // target failed to pull the line low, assume not present
+ serial_output();
+ serial_high();
+ *trans->status = TRANSACTION_NO_RESPONSE;
sei();
- return 1;
+ return TRANSACTION_NO_RESPONSE;
}
- // if the slave is present syncronize with it
- sync_recv();
-
- uint8_t checksum_computed = 0;
- // receive data from the slave
- for (int i = 0; i < SERIAL_SLAVE_BUFFER_LENGTH; ++i) {
- serial_slave_buffer[i] = serial_read_byte();
- sync_recv();
- checksum_computed += serial_slave_buffer[i];
+#else
+ // send transaction table index
+ sync_send();
+ _delay_sub_us(TID_SEND_ADJUST);
+ serial_write_chunk(sstd_index, 4);
+ serial_delay_half1();
+
+ // wait for the target response (step1 low->high)
+ serial_input_with_pullup();
+ while( !serial_read_pin() ) {
+ _delay_sub_us(2);
}
- uint8_t checksum_received = serial_read_byte();
- sync_recv();
- if (checksum_computed != checksum_received) {
- sei();
- return 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
- uint8_t checksum = 0;
- // send data to the slave
- for (int i = 0; i < SERIAL_MASTER_BUFFER_LENGTH; ++i) {
- serial_write_byte(serial_master_buffer[i]);
- sync_recv();
- checksum += serial_master_buffer[i];
+ // 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);
}
- serial_write_byte(checksum);
- sync_recv();
// always, release the line when not in use
- serial_output();
- serial_high();
+ sync_send();
+ *trans->status = TRANSACTION_END;
sei();
- return 0;
+ 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
\ No newline at end of file
projects / qmk_firmware.git / blobdiff