mirror of
https://github.com/Keychron/qmk_firmware.git
synced 2024-11-29 12:17:50 +06:00
Initial arm serial partially based on old lets split code
This commit is contained in:
zvecr
parent
65150984bd
commit
b95979560c
290
drivers/chibios/serial.c
Normal file
290
drivers/chibios/serial.c
Normal file
|
|
@ -0,0 +1,290 @@
|
|||
/*
|
||||
* WARNING: be careful changing this code, it is very timing dependent
|
||||
*/
|
||||
|
||||
#include "quantum.h"
|
||||
#include "serial.h"
|
||||
#include "wait.h"
|
||||
|
||||
#include "hal.h"
|
||||
|
||||
// TODO: resolve/remove build warnings
|
||||
#if defined(RGBLIGHT_ENABLE) && defined(RGBLED_SPLIT) && defined(PROTOCOL_CHIBIOS) && defined(WS2812_DRIVER_BITBANG)
|
||||
# warning "RGBLED_SPLIT not supported with bitbang WS2812 driver"
|
||||
#endif
|
||||
|
||||
// default wait implementation cannot be called within interrupt
|
||||
// this method seems to be more accurate than GPT timers
|
||||
#if PORT_SUPPORTS_RT == FALSE
|
||||
# error "chSysPolledDelayX method not supported on this platform"
|
||||
#else
|
||||
# undef wait_us
|
||||
# define wait_us(x) chSysPolledDelayX(US2RTC(STM32_SYSCLK, x))
|
||||
#endif
|
||||
|
||||
#ifndef SELECT_SOFT_SERIAL_SPEED
|
||||
# define SELECT_SOFT_SERIAL_SPEED 1
|
||||
// TODO: correct speeds...
|
||||
// 0: about 189kbps (Experimental only)
|
||||
// 1: about 137kbps (default)
|
||||
// 2: about 75kbps
|
||||
// 3: about 39kbps
|
||||
// 4: about 26kbps
|
||||
// 5: about 20kbps
|
||||
#endif
|
||||
|
||||
// Serial pulse period in microseconds. At the moment, going lower than 12 causes communication failure
|
||||
#if SELECT_SOFT_SERIAL_SPEED == 0
|
||||
# define SERIAL_DELAY 12
|
||||
#elif SELECT_SOFT_SERIAL_SPEED == 1
|
||||
# define SERIAL_DELAY 16
|
||||
#elif SELECT_SOFT_SERIAL_SPEED == 2
|
||||
# define SERIAL_DELAY 24
|
||||
#elif SELECT_SOFT_SERIAL_SPEED == 3
|
||||
# define SERIAL_DELAY 32
|
||||
#elif SELECT_SOFT_SERIAL_SPEED == 4
|
||||
# define SERIAL_DELAY 48
|
||||
#elif SELECT_SOFT_SERIAL_SPEED == 5
|
||||
# define SERIAL_DELAY 64
|
||||
#else
|
||||
# error invalid SELECT_SOFT_SERIAL_SPEED value
|
||||
#endif
|
||||
|
||||
inline static void serial_delay(void) { wait_us(SERIAL_DELAY); }
|
||||
inline static void serial_delay_half(void) { wait_us(SERIAL_DELAY / 2); }
|
||||
inline static void serial_delay_blip(void) { wait_us(1); }
|
||||
inline static void serial_output(void) { setPinOutput(SOFT_SERIAL_PIN); }
|
||||
inline static void serial_input(void) { setPinInputHigh(SOFT_SERIAL_PIN); }
|
||||
inline static bool serial_read_pin(void) { return !!readPin(SOFT_SERIAL_PIN); }
|
||||
inline static void serial_low(void) { writePinLow(SOFT_SERIAL_PIN); }
|
||||
inline static void serial_high(void) { writePinHigh(SOFT_SERIAL_PIN); }
|
||||
|
||||
void interrupt_handler(void *arg);
|
||||
|
||||
// Use thread + palWaitLineTimeout instead of palSetLineCallback
|
||||
// - Methods like setPinOutput and palEnableLineEvent/palDisableLineEvent
|
||||
// cause the interrupt to lock up, which would limit to only receiving data...
|
||||
static THD_WORKING_AREA(waThread1, 128);
|
||||
static THD_FUNCTION(Thread1, arg) {
|
||||
(void)arg;
|
||||
chRegSetThreadName("blinker");
|
||||
while (true) {
|
||||
palWaitLineTimeout(SOFT_SERIAL_PIN, TIME_INFINITE);
|
||||
interrupt_handler(NULL);
|
||||
}
|
||||
}
|
||||
|
||||
static SSTD_t *Transaction_table = NULL;
|
||||
static uint8_t Transaction_table_size = 0;
|
||||
|
||||
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();
|
||||
|
||||
palEnablePadEvent(PAL_PORT(SOFT_SERIAL_PIN), PAL_PAD(SOFT_SERIAL_PIN), PAL_EVENT_MODE_FALLING_EDGE);
|
||||
chThdCreateStatic(waThread1, sizeof(waThread1), HIGHPRIO, Thread1, NULL);
|
||||
}
|
||||
|
||||
// Used by the master to synchronize timing with the slave.
|
||||
static void __attribute__((noinline)) 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.
|
||||
while (!serial_read_pin()) {
|
||||
}
|
||||
|
||||
serial_delay();
|
||||
}
|
||||
|
||||
// Used by the slave to send a synchronization signal to the master.
|
||||
static void __attribute__((noinline)) sync_send(void) {
|
||||
serial_output();
|
||||
|
||||
serial_low();
|
||||
serial_delay();
|
||||
|
||||
serial_high();
|
||||
}
|
||||
|
||||
// Reads a byte from the serial line
|
||||
static uint8_t __attribute__((noinline)) 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();
|
||||
}
|
||||
|
||||
return byte;
|
||||
}
|
||||
|
||||
// Sends a byte with MSB ordering
|
||||
static void __attribute__((noinline)) serial_write_byte(uint8_t data) {
|
||||
uint8_t b = 8;
|
||||
serial_output();
|
||||
while (b--) {
|
||||
if (data & (1 << b)) {
|
||||
serial_high();
|
||||
} else {
|
||||
serial_low();
|
||||
}
|
||||
serial_delay();
|
||||
}
|
||||
}
|
||||
|
||||
// interrupt handle to be used by the slave device
|
||||
void interrupt_handler(void *arg) {
|
||||
chSysLockFromISR();
|
||||
|
||||
sync_send();
|
||||
|
||||
// read mid pulses
|
||||
serial_delay_blip();
|
||||
|
||||
uint8_t checksum_computed = 0;
|
||||
int sstd_index = 0;
|
||||
|
||||
#ifdef SERIAL_USE_MULTI_TRANSACTION
|
||||
sstd_index = serial_read_byte();
|
||||
sync_send();
|
||||
#endif
|
||||
|
||||
SSTD_t *trans = &Transaction_table[sstd_index];
|
||||
for (int i = 0; i < trans->initiator2target_buffer_size; ++i) {
|
||||
trans->initiator2target_buffer[i] = serial_read_byte();
|
||||
sync_send();
|
||||
checksum_computed += trans->initiator2target_buffer[i];
|
||||
}
|
||||
checksum_computed ^= 7;
|
||||
uint8_t checksum_received = serial_read_byte();
|
||||
sync_send();
|
||||
|
||||
// wait for the sync to finish sending
|
||||
serial_delay();
|
||||
|
||||
uint8_t checksum = 0;
|
||||
for (int i = 0; i < trans->target2initiator_buffer_size; ++i) {
|
||||
serial_write_byte(trans->target2initiator_buffer[i]);
|
||||
sync_send();
|
||||
serial_delay_half();
|
||||
checksum += trans->target2initiator_buffer[i];
|
||||
}
|
||||
serial_write_byte(checksum ^ 7);
|
||||
sync_send();
|
||||
|
||||
// wait for the sync to finish sending
|
||||
serial_delay();
|
||||
|
||||
*trans->status = (checksum_computed == checksum_received) ? TRANSACTION_ACCEPTED : TRANSACTION_DATA_ERROR;
|
||||
|
||||
// end transaction
|
||||
serial_input();
|
||||
|
||||
// TODO: remove extra delay between transactions
|
||||
serial_delay();
|
||||
|
||||
chSysUnlockFromISR();
|
||||
}
|
||||
|
||||
/////////
|
||||
// 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) {
|
||||
int sstd_index = 0;
|
||||
#else
|
||||
int soft_serial_transaction(int sstd_index) {
|
||||
#endif
|
||||
|
||||
if (sstd_index > Transaction_table_size) return TRANSACTION_TYPE_ERROR;
|
||||
SSTD_t *trans = &Transaction_table[sstd_index];
|
||||
|
||||
// TODO: remove extra delay between transactions
|
||||
serial_delay();
|
||||
|
||||
// this code is very time dependent, so we need to disable interrupts
|
||||
chSysLock();
|
||||
|
||||
// signal to the slave that we want to start a transaction
|
||||
serial_output();
|
||||
serial_low();
|
||||
serial_delay_blip();
|
||||
|
||||
// wait for the slaves response
|
||||
serial_input();
|
||||
serial_high();
|
||||
serial_delay();
|
||||
|
||||
// check if the slave is present
|
||||
if (serial_read_pin()) {
|
||||
// slave failed to pull the line low, assume not present
|
||||
dprintf("serial::NO_RESPONSE\n");
|
||||
chSysUnlock();
|
||||
return TRANSACTION_NO_RESPONSE;
|
||||
}
|
||||
|
||||
// if the slave is present syncronize with it
|
||||
|
||||
uint8_t checksum = 0;
|
||||
// send data to the slave
|
||||
#ifdef SERIAL_USE_MULTI_TRANSACTION
|
||||
serial_write_byte(sstd_index); // first chunk is transaction id
|
||||
sync_recv();
|
||||
#endif
|
||||
for (int i = 0; i < trans->initiator2target_buffer_size; ++i) {
|
||||
serial_write_byte(trans->initiator2target_buffer[i]);
|
||||
sync_recv();
|
||||
checksum += trans->initiator2target_buffer[i];
|
||||
}
|
||||
serial_write_byte(checksum ^ 7);
|
||||
sync_recv();
|
||||
|
||||
serial_delay();
|
||||
serial_delay(); // read mid pulses
|
||||
|
||||
// receive data from the slave
|
||||
uint8_t checksum_computed = 0;
|
||||
for (int i = 0; i < trans->target2initiator_buffer_size; ++i) {
|
||||
trans->target2initiator_buffer[i] = serial_read_byte();
|
||||
sync_recv();
|
||||
checksum_computed += trans->target2initiator_buffer[i];
|
||||
}
|
||||
checksum_computed ^= 7;
|
||||
uint8_t checksum_received = serial_read_byte();
|
||||
|
||||
sync_recv();
|
||||
serial_delay();
|
||||
|
||||
if ((checksum_computed) != (checksum_received)) {
|
||||
dprintf("serial::FAIL[%u,%u,%u]\n", checksum_computed, checksum_received, sstd_index);
|
||||
serial_output();
|
||||
serial_high();
|
||||
|
||||
chSysUnlock();
|
||||
return TRANSACTION_DATA_ERROR;
|
||||
}
|
||||
|
||||
// always, release the line when not in use
|
||||
serial_high();
|
||||
serial_output();
|
||||
|
||||
chSysUnlock();
|
||||
return TRANSACTION_END;
|
||||
}
|
||||
|
|
@ -203,7 +203,7 @@
|
|||
* @note Disabling this option saves both code and data space.
|
||||
*/
|
||||
# if !defined(PAL_USE_CALLBACKS) || defined(__DOXYGEN__)
|
||||
# define PAL_USE_CALLBACKS FALSE
|
||||
# define PAL_USE_CALLBACKS TRUE
|
||||
# endif
|
||||
|
||||
/**
|
||||
|
|
@ -211,7 +211,7 @@
|
|||
* @note Disabling this option saves both code and data space.
|
||||
*/
|
||||
# if !defined(PAL_USE_WAIT) || defined(__DOXYGEN__)
|
||||
# define PAL_USE_WAIT FALSE
|
||||
# define PAL_USE_WAIT TRUE
|
||||
# endif
|
||||
|
||||
/*===========================================================================*/
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user