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remove checksum check, add parity check

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This commit is contained in:
mtei
2018-07-21 23:54:47 +09:00
parent 8ec5499b5a
commit f8370ac02e
1 changed files with 64 additions and 48 deletions
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112
keyboards/helix/serial.c
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@@ -17,6 +17,7 @@
#ifdef USE_SERIAL
#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.
@@ -24,28 +25,28 @@
#if SELECT_SERIAL_SPEED == 0
// Very High speed
#define SERIAL_DELAY 4 // micro sec
#define READ_WRITE_START_ADJUST 5 // cycles
#define READ_WRITE_WIDTH_ADJUST 2 // cycles
#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 5 // cycles
#define READ_WRITE_WIDTH_ADJUST 2 // cycles
#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 5 // cycles
#define READ_WRITE_WIDTH_ADJUST 2 // cycles
#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 5 // cycles
#define READ_WRITE_WIDTH_ADJUST 2 // cycles
#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 5 // cycles
#define READ_WRITE_WIDTH_ADJUST 2 // cycles
#define READ_WRITE_START_ADJUST 30 // cycles
#define READ_WRITE_WIDTH_ADJUST 3 // cycles
#else
#error Illegal Serial Speed
#endif
@@ -160,77 +161,92 @@ void sync_send(void) {
}
// Reads a byte from the serial line
static
uint8_t serial_read_byte(void) {
uint8_t byte = 0;
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 ( uint8_t i = 0; i < 8; ++i) {
serial_delay_half1(); // read the middle of pulses
debug_recvsample();
byte = (byte << 1) | serial_read_pin();
debug_recvsample();
_delay_sub_us(READ_WRITE_WIDTH_ADJUST);
serial_delay_half2();
debug_dummy_delay_recv();
for( i = 0, byte = 0, p = 0; i < bit; i++ ) {
serial_delay_half1(); // read the middle of pulses
debug_recvsample();
if( serial_read_pin() ) {
byte = (byte << 1) | 1; p ^= 1;
} else {
byte = (byte << 1) | 0; p ^= 0;
}
debug_recvsample();
_delay_sub_us(READ_WRITE_WIDTH_ADJUST);
serial_delay_half2();
debug_dummy_delay_recv();
}
/* recive parity bit */
serial_delay_half1(); // read the middle of pulses
debug_recvsample();
pb = serial_read_pin();
debug_recvsample();
_delay_sub_us(READ_WRITE_WIDTH_ADJUST);
serial_delay_half2();
debug_dummy_delay_recv();
if( p == pb ) debug_parity_on();
*pterrcount += (p != pb)? 1 : 0;
debug_parity_off();
return byte;
}
// Sends a byte with MSB ordering
static
void serial_write_byte(uint8_t data) {
uint8_t b = 1<<7;
while( b ) {
if(data & 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;
}
debug_recvsample();
serial_delay();
debug_recvsample();
debug_dummy_delay_send();
}
b >>= 1;
/* send parity bit */
if(p & 1) { serial_high(); }
else { serial_low(); }
debug_recvsample();
serial_delay();
debug_recvsample();
debug_dummy_delay_send();
}
serial_low(); // sync_send() / senc_recv() need raise edge
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) {
uint8_t checksum = 0;
for (uint8_t i = 0; i < size; ++i) {
uint8_t data;
data = buffer[i];
sync_send();
debug_bytewidth_start();
serial_write_byte(data);
serial_write_chunk(data,8);
debug_bytewidth_end();
checksum += data;
}
sync_send();
debug_bytewidth_start();
serial_write_byte(checksum);
debug_bytewidth_end();
}
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 checksum_computed = 0;
uint8_t pecount = 0;
for (uint8_t i = 0; i < size; ++i) {
uint8_t data;
sync_recv();
debug_bytewidth_start();
data = serial_read_byte();
data = serial_read_chunk(&pecount, 8);
debug_bytewidth_end();
buffer[i] = data;
checksum_computed += data;
}
sync_recv();
debug_bytewidth_start();
uint8_t checksum_received = serial_read_byte();
debug_bytewidth_end();
return checksum_computed == checksum_received;
return pecount == 0;
}
inline static