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@@ -9,36 +9,128 @@
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <util/delay.h>
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+#include <stddef.h>
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#include <stdbool.h>
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#include "serial.h"
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+//#include <pro_micro.h>
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#ifdef USE_SERIAL
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-// Serial pulse period in microseconds. Its probably a bad idea to lower this
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-// value.
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-#define SERIAL_DELAY 24
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+#ifndef SERIAL_USE_MULTI_TRANSACTION
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+/* --- USE Simple API (OLD API, compatible with let's split serial.c) */
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+ #if SERIAL_SLAVE_BUFFER_LENGTH > 0
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+ uint8_t volatile serial_slave_buffer[SERIAL_SLAVE_BUFFER_LENGTH] = {0};
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+ #endif
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+ #if SERIAL_MASTER_BUFFER_LENGTH > 0
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+ uint8_t volatile serial_master_buffer[SERIAL_MASTER_BUFFER_LENGTH] = {0};
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+ #endif
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+ uint8_t volatile status0 = 0;
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+
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+SSTD_t transactions[] = {
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+ { (uint8_t *)&status0,
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+ #if SERIAL_MASTER_BUFFER_LENGTH > 0
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+ sizeof(serial_master_buffer), (uint8_t *)serial_master_buffer,
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+ #else
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+ 0, (uint8_t *)NULL,
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+ #endif
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+ #if SERIAL_SLAVE_BUFFER_LENGTH > 0
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+ sizeof(serial_slave_buffer), (uint8_t *)serial_slave_buffer
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+ #else
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+ 0, (uint8_t *)NULL,
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+ #endif
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+ }
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+};
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+
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+void serial_master_init(void)
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+{ soft_serial_initiator_init(transactions); }
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-uint8_t volatile serial_slave_buffer[SERIAL_SLAVE_BUFFER_LENGTH] = {0};
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-uint8_t volatile serial_master_buffer[SERIAL_MASTER_BUFFER_LENGTH] = {0};
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+void serial_slave_init(void)
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+{ soft_serial_target_init(transactions); }
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-#define SLAVE_DATA_CORRUPT (1<<0)
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-volatile uint8_t status = 0;
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+// 0 => no error
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+// 1 => slave did not respond
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+// 2 => checksum error
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+int serial_update_buffers()
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+{ return soft_serial_transaction(); }
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+
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+#endif // Simple API (OLD API, compatible with let's split serial.c)
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+
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+#define ALWAYS_INLINE __attribute__((always_inline))
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+#define NO_INLINE __attribute__((noinline))
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+#define _delay_sub_us(x) __builtin_avr_delay_cycles(x)
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+
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+// Serial pulse period in microseconds.
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+#define TID_SEND_ADJUST 14
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+
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+#define SELECT_SERIAL_SPEED 1
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+#if SELECT_SERIAL_SPEED == 0
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+ // Very High speed
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+ #define SERIAL_DELAY 4 // micro sec
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+ #define READ_WRITE_START_ADJUST 33 // cycles
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+ #define READ_WRITE_WIDTH_ADJUST 3 // cycles
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+#elif SELECT_SERIAL_SPEED == 1
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+ // High speed
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+ #define SERIAL_DELAY 6 // micro sec
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+ #define READ_WRITE_START_ADJUST 30 // cycles
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+ #define READ_WRITE_WIDTH_ADJUST 3 // cycles
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+#elif SELECT_SERIAL_SPEED == 2
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+ // Middle speed
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+ #define SERIAL_DELAY 12 // micro sec
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+ #define READ_WRITE_START_ADJUST 30 // cycles
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+ #define READ_WRITE_WIDTH_ADJUST 3 // cycles
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+#elif SELECT_SERIAL_SPEED == 3
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+ // Low speed
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+ #define SERIAL_DELAY 24 // micro sec
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+ #define READ_WRITE_START_ADJUST 30 // cycles
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+ #define READ_WRITE_WIDTH_ADJUST 3 // cycles
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+#elif SELECT_SERIAL_SPEED == 4
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+ // Very Low speed
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+ #define SERIAL_DELAY 50 // micro sec
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+ #define READ_WRITE_START_ADJUST 30 // cycles
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+ #define READ_WRITE_WIDTH_ADJUST 3 // cycles
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+#else
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+#error Illegal Serial Speed
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+#endif
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+
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+
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+#define SERIAL_DELAY_HALF1 (SERIAL_DELAY/2)
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+#define SERIAL_DELAY_HALF2 (SERIAL_DELAY - SERIAL_DELAY/2)
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+
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+#define SLAVE_INT_WIDTH_US 1
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+#ifndef SERIAL_USE_MULTI_TRANSACTION
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+ #define SLAVE_INT_RESPONSE_TIME SERIAL_DELAY
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+#else
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+ #define SLAVE_INT_ACK_WIDTH_UNIT 2
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+ #define SLAVE_INT_ACK_WIDTH 4
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+#endif
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+
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+static SSTD_t *Transaction_table = NULL;
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inline static
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void serial_delay(void) {
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_delay_us(SERIAL_DELAY);
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}
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-void serial_delay_short(void) {
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- _delay_us(SERIAL_DELAY-1);
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+
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+inline static
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+void serial_delay_half1(void) {
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+ _delay_us(SERIAL_DELAY_HALF1);
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+}
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+
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+inline static
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+void serial_delay_half2(void) {
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+ _delay_us(SERIAL_DELAY_HALF2);
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}
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+
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+inline static void serial_output(void) ALWAYS_INLINE;
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inline static
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void serial_output(void) {
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SERIAL_PIN_DDR |= SERIAL_PIN_MASK;
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}
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// make the serial pin an input with pull-up resistor
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+inline static void serial_input_with_pullup(void) ALWAYS_INLINE;
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inline static
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-void serial_input(void) {
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+void serial_input_with_pullup(void) {
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SERIAL_PIN_DDR &= ~SERIAL_PIN_MASK;
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SERIAL_PIN_PORT |= SERIAL_PIN_MASK;
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}
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@@ -48,191 +140,305 @@ uint8_t serial_read_pin(void) {
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return !!(SERIAL_PIN_INPUT & SERIAL_PIN_MASK);
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}
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+inline static void serial_low(void) ALWAYS_INLINE;
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inline static
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void serial_low(void) {
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SERIAL_PIN_PORT &= ~SERIAL_PIN_MASK;
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}
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+inline static void serial_high(void) ALWAYS_INLINE;
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inline static
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void serial_high(void) {
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SERIAL_PIN_PORT |= SERIAL_PIN_MASK;
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}
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-void serial_master_init(void) {
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- serial_output();
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- serial_high();
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+void soft_serial_initiator_init(SSTD_t *sstd_table)
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+{
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+ Transaction_table = sstd_table;
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+ serial_output();
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+ serial_high();
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}
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-void serial_slave_init(void) {
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- serial_input();
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-
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-#ifndef USE_SERIAL_PD2
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- // Enable INT0
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- EIMSK |= _BV(INT0);
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- // Trigger on falling edge of INT0
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- EICRA &= ~(_BV(ISC00) | _BV(ISC01));
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+void soft_serial_target_init(SSTD_t *sstd_table)
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+{
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+ Transaction_table = sstd_table;
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+ serial_input_with_pullup();
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+
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+#if SERIAL_PIN_MASK == _BV(PD0)
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+ // Enable INT0
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+ EIMSK |= _BV(INT0);
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+ // Trigger on falling edge of INT0
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+ EICRA &= ~(_BV(ISC00) | _BV(ISC01));
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+#elif SERIAL_PIN_MASK == _BV(PD2)
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+ // Enable INT2
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+ EIMSK |= _BV(INT2);
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+ // Trigger on falling edge of INT2
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+ EICRA &= ~(_BV(ISC20) | _BV(ISC21));
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#else
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- // Enable INT2
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- EIMSK |= _BV(INT2);
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- // Trigger on falling edge of INT2
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- EICRA &= ~(_BV(ISC20) | _BV(ISC21));
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+ #error unknown SERIAL_PIN_MASK value
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#endif
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}
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-// Used by the master to synchronize timing with the slave.
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+// Used by the sender to synchronize timing with the reciver.
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+static void sync_recv(void) NO_INLINE;
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static
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void sync_recv(void) {
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- serial_input();
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- // This shouldn't hang if the slave disconnects because the
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- // serial line will float to high if the slave does disconnect.
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+ for (uint8_t i = 0; i < SERIAL_DELAY*5 && serial_read_pin(); i++ ) {
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+ }
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+ // This shouldn't hang if the target disconnects because the
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+ // serial line will float to high if the target does disconnect.
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while (!serial_read_pin());
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- //serial_delay();
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- _delay_us(SERIAL_DELAY-5);
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}
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-// Used by the slave to send a synchronization signal to the master.
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+// Used by the reciver to send a synchronization signal to the sender.
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+static void sync_send(void)NO_INLINE;
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static
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void sync_send(void) {
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- serial_output();
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-
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serial_low();
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serial_delay();
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-
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serial_high();
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}
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// Reads a byte from the serial line
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-static
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-uint8_t serial_read_byte(void) {
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- uint8_t byte = 0;
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- serial_input();
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- for ( uint8_t i = 0; i < 8; ++i) {
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- byte = (byte << 1) | serial_read_pin();
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- serial_delay();
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- _delay_us(1);
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+static uint8_t serial_read_chunk(uint8_t *pterrcount, uint8_t bit) NO_INLINE;
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+static uint8_t serial_read_chunk(uint8_t *pterrcount, uint8_t bit) {
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+ uint8_t byte, i, p, pb;
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+
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+ _delay_sub_us(READ_WRITE_START_ADJUST);
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+ for( i = 0, byte = 0, p = 0; i < bit; i++ ) {
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+ serial_delay_half1(); // read the middle of pulses
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+ if( serial_read_pin() ) {
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+ byte = (byte << 1) | 1; p ^= 1;
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+ } else {
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+ byte = (byte << 1) | 0; p ^= 0;
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+ }
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+ _delay_sub_us(READ_WRITE_WIDTH_ADJUST);
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+ serial_delay_half2();
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}
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+ /* recive parity bit */
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+ serial_delay_half1(); // read the middle of pulses
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+ pb = serial_read_pin();
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+ _delay_sub_us(READ_WRITE_WIDTH_ADJUST);
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+ serial_delay_half2();
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+
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+ *pterrcount += (p != pb)? 1 : 0;
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return byte;
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}
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// Sends a byte with MSB ordering
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-static
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-void serial_write_byte(uint8_t data) {
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- uint8_t b = 8;
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- serial_output();
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- while( b-- ) {
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- if(data & (1 << b)) {
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- serial_high();
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- } else {
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- serial_low();
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+void serial_write_chunk(uint8_t data, uint8_t bit) NO_INLINE;
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+void serial_write_chunk(uint8_t data, uint8_t bit) {
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+ uint8_t b, p;
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+ for( p = 0, b = 1<<(bit-1); b ; b >>= 1) {
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+ if(data & b) {
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+ serial_high(); p ^= 1;
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+ } else {
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+ serial_low(); p ^= 0;
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+ }
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+ serial_delay();
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}
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+ /* send parity bit */
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+ if(p & 1) { serial_high(); }
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+ else { serial_low(); }
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serial_delay();
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- }
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-}
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-// interrupt handle to be used by the slave device
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-ISR(SERIAL_PIN_INTERRUPT) {
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- sync_send();
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+ serial_low(); // sync_send() / senc_recv() need raise edge
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+}
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- uint8_t checksum = 0;
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- for (int i = 0; i < SERIAL_SLAVE_BUFFER_LENGTH; ++i) {
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- serial_write_byte(serial_slave_buffer[i]);
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+static void serial_send_packet(uint8_t *buffer, uint8_t size) NO_INLINE;
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+static
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+void serial_send_packet(uint8_t *buffer, uint8_t size) {
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+ for (uint8_t i = 0; i < size; ++i) {
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+ uint8_t data;
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+ data = buffer[i];
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sync_send();
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- checksum += serial_slave_buffer[i];
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+ serial_write_chunk(data,8);
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}
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- serial_write_byte(checksum);
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- sync_send();
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+}
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- // wait for the sync to finish sending
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- serial_delay();
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+static uint8_t serial_recive_packet(uint8_t *buffer, uint8_t size) NO_INLINE;
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+static
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+uint8_t serial_recive_packet(uint8_t *buffer, uint8_t size) {
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+ uint8_t pecount = 0;
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+ for (uint8_t i = 0; i < size; ++i) {
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+ uint8_t data;
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+ sync_recv();
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+ data = serial_read_chunk(&pecount, 8);
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+ buffer[i] = data;
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+ }
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+ return pecount == 0;
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+}
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- // read the middle of pulses
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- _delay_us(SERIAL_DELAY/2);
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+inline static
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+void change_sender2reciver(void) {
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+ sync_send(); //0
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+ serial_delay_half1(); //1
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+ serial_low(); //2
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+ serial_input_with_pullup(); //2
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+ serial_delay_half1(); //3
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+}
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- uint8_t checksum_computed = 0;
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- for (int i = 0; i < SERIAL_MASTER_BUFFER_LENGTH; ++i) {
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- serial_master_buffer[i] = serial_read_byte();
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- sync_send();
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- checksum_computed += serial_master_buffer[i];
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- }
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- uint8_t checksum_received = serial_read_byte();
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- sync_send();
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+inline static
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+void change_reciver2sender(void) {
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+ sync_recv(); //0
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+ serial_delay(); //1
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+ serial_low(); //3
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+ serial_output(); //3
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+ serial_delay_half1(); //4
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+}
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- serial_input(); // end transaction
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+// interrupt handle to be used by the target device
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+ISR(SERIAL_PIN_INTERRUPT) {
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- if ( checksum_computed != checksum_received ) {
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- status |= SLAVE_DATA_CORRUPT;
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+#ifndef SERIAL_USE_MULTI_TRANSACTION
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+ serial_low();
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+ serial_output();
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+ SSTD_t *trans = Transaction_table;
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+#else
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+ // recive transaction table index
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+ uint8_t tid;
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+ uint8_t pecount = 0;
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+ sync_recv();
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+ tid = serial_read_chunk(&pecount,4);
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+ if(pecount> 0)
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+ return;
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+ serial_delay_half1();
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+
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+ serial_high(); // response step1 low->high
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+ serial_output();
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+ _delay_sub_us(SLAVE_INT_ACK_WIDTH_UNIT*SLAVE_INT_ACK_WIDTH);
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+ SSTD_t *trans = &Transaction_table[tid];
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+ serial_low(); // response step2 ack high->low
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+#endif
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+
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+ // target send phase
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+ if( trans->target2initiator_buffer_size > 0 )
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+ serial_send_packet((uint8_t *)trans->target2initiator_buffer,
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+ trans->target2initiator_buffer_size);
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+ // target switch to input
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+ change_sender2reciver();
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+
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+ // target recive phase
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+ if( trans->initiator2target_buffer_size > 0 ) {
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+ if (serial_recive_packet((uint8_t *)trans->initiator2target_buffer,
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+ trans->initiator2target_buffer_size) ) {
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+ *trans->status = TRANSACTION_ACCEPTED;
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+ } else {
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+ *trans->status = TRANSACTION_DATA_ERROR;
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+ }
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} else {
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- status &= ~SLAVE_DATA_CORRUPT;
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+ *trans->status = TRANSACTION_ACCEPTED;
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}
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-}
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-inline
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-bool serial_slave_DATA_CORRUPT(void) {
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- return status & SLAVE_DATA_CORRUPT;
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+ sync_recv(); //weit initiator output to high
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}
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-// Copies the serial_slave_buffer to the master and sends the
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-// serial_master_buffer to the slave.
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+/////////
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+// start transaction by initiator
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+//
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+// int soft_serial_transaction(int sstd_index)
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//
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// Returns:
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-// 0 => no error
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-// 1 => slave did not respond
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-int serial_update_buffers(void) {
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- // this code is very time dependent, so we need to disable interrupts
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+// TRANSACTION_END
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+// TRANSACTION_NO_RESPONSE
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+// TRANSACTION_DATA_ERROR
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+// this code is very time dependent, so we need to disable interrupts
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+#ifndef SERIAL_USE_MULTI_TRANSACTION
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+int soft_serial_transaction(void) {
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+ SSTD_t *trans = Transaction_table;
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+#else
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+int soft_serial_transaction(int sstd_index) {
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+ SSTD_t *trans = &Transaction_table[sstd_index];
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+#endif
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cli();
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- // signal to the slave that we want to start a transaction
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+ // signal to the target that we want to start a transaction
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serial_output();
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serial_low();
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- _delay_us(1);
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+ _delay_us(SLAVE_INT_WIDTH_US);
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- // wait for the slaves response
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- serial_input();
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- serial_high();
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- _delay_us(SERIAL_DELAY);
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+#ifndef SERIAL_USE_MULTI_TRANSACTION
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+ // wait for the target response
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+ serial_input_with_pullup();
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+ _delay_us(SLAVE_INT_RESPONSE_TIME);
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|
|
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- // check if the slave is present
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+ // check if the target is present
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if (serial_read_pin()) {
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- // slave failed to pull the line low, assume not present
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+ // target failed to pull the line low, assume not present
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+ serial_output();
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+ serial_high();
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+ *trans->status = TRANSACTION_NO_RESPONSE;
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|
sei();
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|
- return 1;
|
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|
+ return TRANSACTION_NO_RESPONSE;
|
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|
}
|
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|
|
|
|
- // if the slave is present syncronize with it
|
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|
- sync_recv();
|
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|
-
|
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|
- 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
|
marksard