#include "serial_dma.h"
#include "timer_dma.h"
+#include "main_time.h"
+#include "main_emit.h"
+#include "main_comm.h"
+
/**
* Mode of operation:
* Devices 1 and 2 synchronize clocks using serial messages.
*/
/*******************
- * Timer functions *
+ * Tasks Scheduler *
*******************/
-#define NSEC_PER_SEC 1000000000ULL
-
-uint64_t time_last_local; // timestamp at last time sync
-uint64_t time_last_world; // offset at last time sync
-
-/**
- * Generate time stamp for an async event:
- * time: drift compensated wall-clock time
- * stamp: event timestamp from PIT Module
- */
-uint64_t time_to_world(uint64_t local)
-{
- uint64_t elapsed = local - time_last_local;
- return time_last_world + elapsed;
-}
-
-uint64_t time_to_local(uint64_t world)
-{
- uint64_t elapsed = world - time_last_world;
- return time_last_local + elapsed;
-}
-
-/**
- * Synchronize the timer internal state with updates
- * from an external time sync message.
- * local: our internal timestamp for the event
- * world: reference timestamp from the other device
- */
-void time_ext_init(uint64_t local, uint64_t world)
-{
- sirq_printf("initialize clocks: %d -> %d\r\n",
- (int)(local/NSEC_PER_SEC),
- (int)(world/NSEC_PER_SEC));
-
- time_last_local = local;
- time_last_world = world;
-}
-
-/**
- * Synchronize the timer internal state with updates
- * from an external time sync message.
- * local: our internal timestamp for the event
- * world: reference timestamp from the other device
- */
-void time_ext_sync(uint64_t local, uint64_t world)
-{
- uint64_t guess = time_to_world(local);
-
- time_last_local = local;
- time_last_world = (guess/2) + (world/2);
- //time_last_world = (guess * 3 / 4) + (world * 1 / 4);
- //time_last_world =
- // (guess - ( guess / 2)) +
- // (world - (world - world / 2));
- //time_last_world =
- // (guess - (guess - guess / 4)) +
- // (world - ( world / 4));
-
- world = time_last_world;
-
-//#ifdef VERBOSE
-#if 1
- uint64_t error = world > guess ? world - guess :
- guess > world ? guess - world : 0;
- int ahead = guess > world;
- sirq_printf("syncing clocks: %6d=%d.%04u -> %d.%04u (err: %s%ld.%09lu)\r\n",
- (int)((local / NSEC_PER_SEC)),
- (int)((guess / NSEC_PER_SEC)),
- (int)((guess % NSEC_PER_SEC)/(NSEC_PER_SEC/10000)),
- (int)((world / NSEC_PER_SEC)),
- (int)((world % NSEC_PER_SEC)/(NSEC_PER_SEC/10000)),
- ahead ? "-" : " ",
- (int32_t )(error / (int64_t)NSEC_PER_SEC),
- (uint32_t)(error % (int64_t)NSEC_PER_SEC));
-#endif
-//#endif
-}
-
-void time_printf(const char *label, uint64_t local)
-{
- uint64_t world = time_to_world(local);
- sirq_printf("%s -- %d.%09u -> %d.%09u\r\n",
- label,
- (int)(local / NSEC_PER_SEC),
- (int)(local % NSEC_PER_SEC),
- (int)(world / NSEC_PER_SEC),
- (int)(world % NSEC_PER_SEC));
-}
-
-/*********************
- * Signal generation *
- *********************/
-
-// for 50 Mhz clock 50/1000 = 1/20 (PLL/2)
-
-// for 48 Mhz clock 48/1000 = 6/125 (FLL)
-// for 24 Mhz clock, 24/1000 = 3/125
-// for 12 Mhz clock, 12/1000 = 3/250
-// for 6 Mhz clock, 6/1000 = 3/500
-// for 3 Mhz clock, 3/1000 = 3/1000
-
-#define EMIT_PS 1
-
-//#if EMIT_PS == 0
-//#define EMIT_CLOCKS(nsec) ((uint16_t)((nsec) / 20))
-//#define EMIT_NSEC(clocks) ((uint16_t)((clocks) * 20))
-
-#if EMIT_PS == 0
-#define EMIT_CLOCKS(nsec) ((uint32_t)((nsec) * 6 / 125))
-#define EMIT_NSEC(clocks) ((uint32_t)((clocks) * 125 / 6))
-#elif EMIT_PS == 1
-#define EMIT_CLOCKS(nsec) ((uint32_t)((nsec) * 3 / 125))
-#define EMIT_NSEC(clocks) ((uint32_t)((clocks) * 125 / 3))
-#elif EMIT_PS == 2
-#define EMIT_CLOCKS(nsec) ((uint32_t)((nsec) * 3 / 250))
-#define EMIT_NSEC(clocks) ((uint32_t)((clocks) * 250 / 3))
-#elif EMIT_PS == 3
-#define EMIT_CLOCKS(nsec) ((uint32_t)((nsec) * 3 / 500))
-#define EMIT_NSEC(clocks) ((uint32_t)((clocks) * 500 / 3))
-#elif EMIT_PS == 4
-#define EMIT_CLOCKS(nsec) ((uint32_t)((nsec) * 3 / 1000))
-#define EMIT_NSEC(clocks) ((uint32_t)((clocks) * 1000 / 3))
-#endif
-
-static uint32_t *emit_pcr = 0; // transmit pin name
-
-static uint64_t emit_start = 0; // transmit start time (world time)
-static uint64_t emit_period = 0; // transmit period
-static uint64_t emit_due = 0; // next transmit (world time)
-
-static uint32_t emit_slack = 0; // how far ahead we need to schedule, in us
-static uint32_t emit_worst = 0; // worst-case latency in task table
-
-void emit_init(int alt, PinName pin, PinMode mode)
-{
- // Find pin
- emit_pcr = (uint32_t*)(PORTA_BASE + pin);
-
- // Enable clocks
- SIM->SCGC6 |= SIM_SCGC6_TPM1_MASK;
- SIM->SOPT2 |= SIM_SOPT2_TPMSRC(1);
-
- // Reset PLL Source
- //SIM->SOPT2 &= ~SIM_SOPT2_PLLFLLSEL_MASK;
-
- // Debug print on SOPT2
- // -- mbed may set PLLFLL when configuring UART0
- // SOPT2: u0src=1 tpmsrc=1 USBSRC PLL/2 clkos=0 rtcos
- sirq_printf("SOPT2: u0src=%d tpmsrc=%d %s %s clkos=%d %s\r\n",
- (SIM->SOPT2 & SIM_SOPT2_UART0SRC_MASK) >> SIM_SOPT2_UART0SRC_SHIFT,
- (SIM->SOPT2 & SIM_SOPT2_TPMSRC_MASK) >> SIM_SOPT2_TPMSRC_SHIFT,
- (SIM->SOPT2 & SIM_SOPT2_UART0SRC_MASK) ? "USBSRC" : "usbsrc",
- (SIM->SOPT2 & SIM_SOPT2_PLLFLLSEL_MASK) ? "PLL/2" : "FLL",
- (SIM->SOPT2 & SIM_SOPT2_CLKOUTSEL_MASK) >> SIM_SOPT2_CLKOUTSEL_SHIFT,
- (SIM->SOPT2 & SIM_SOPT2_RTCCLKOUTSEL_MASK) ? "RTCOS" : "rtcos");
-
- // Set pin mode
- emit_pcr[0] = PORT_PCR_ISF_MASK
- | PORT_PCR_MUX(alt)
- | mode;
-
- // Setup Timer/PWM Module
- TPM1->SC = TPM_SC_TOF_MASK;
- TPM1->CNT = TPM_CNT_COUNT(0);
- TPM1->MOD = TPM_MOD_MOD(0xFFFF);
-
- TPM1->CONTROLS[0].CnSC = TPM_CnSC_CHF_MASK // clear flag
- | TPM_CnSC_MSB_MASK // set output highon match,
- | TPM_CnSC_ELSB_MASK // cleared on overflow
- | TPM_CnSC_ELSA_MASK; // ..
-
- TPM1->STATUS = TPM_STATUS_CH0F_MASK
- | TPM_STATUS_TOF_MASK;
-
- TPM1->CONF = TPM_CONF_CSOO_MASK;
-}
-
-void emit_enable(uint64_t start, uint64_t period)
-{
- const int slack_clocks = 0x4000; // tune based on emit_worst
-
- emit_start = start;
- emit_period = period;
- emit_due = start + period;
-
- emit_slack = EMIT_NSEC(slack_clocks);
-
- time_printf("emit scheduled", emit_due);
-}
-
-void emit_schedule(uint64_t when)
-{
- uint64_t local = time_to_local(when) * 3 / 125;
- uint32_t width = EMIT_CLOCKS(10000);
-
- // Disable timer
- TPM1->SC = TPM_SC_TOF_MASK;
-
- __disable_irq();
-
- uint64_t now = ((uint64_t)~PIT->LTMR64H << 32)
- | ((uint64_t)~PIT->LTMR64L);
- uint32_t delta = local - now;
- uint32_t start = delta >> (EMIT_PS-1); // convert to clocks
- uint32_t stop = start + width; // end time
-
- // Set transmit time
- TPM1->CONTROLS[0].CnV = start;
- TPM1->MOD = TPM_MOD_MOD(stop);
-
- // Start the timer
- TPM1->SC = TPM_SC_TOF_MASK
- | TPM_SC_PS(EMIT_PS)
- | TPM_SC_CMOD(1);
-
- __enable_irq();
-
- // Test
- //int64_t cnv = TPM1->CONTROLS[0].CnV;
- //int64_t mod = TPM1->MOD;
- //int64_t due = local - tdma_time();
- //sirq_printf("%6d -- cnv=%04x mod=%04x due=%04x start=%04x\r\n",
- // (int)(cnv - EMIT_CLOCKS(due)),
- // (int)cnv, (int)mod,
- // (int)EMIT_CLOCKS(due), EMIT_CLOCKS(start));
-
- // Clock testing
- //uint32_t test_tpm0 = TPM1->CNT;
- //uint32_t test_pit0 = ~PIT->CHANNEL[0].CVAL;
- //for (int i = 0; i < 100; i++)
- // asm("nop");
- //uint32_t test_tpm1 = TPM1->CNT;
- //uint32_t test_pit1 = ~PIT->CHANNEL[0].CVAL;
-
- //uint32_t test_tpm = test_tpm1 - test_tpm0;
- //uint32_t test_pit = test_pit1 - test_pit0;
- //sirq_printf("pit/tpm: %d - tpm=%08x/%08x=%d pit=%08x/%08x=%d\r\n",
- // test_tpm - test_pit,
- // test_tpm0, test_tpm1, test_tpm,
- // test_pit0, test_pit1, test_pit);
-
- // Debug output
- //time_printf("emitting event", when);
-}
-
-void emit_transmit(uint64_t local, uint64_t world)
-{
- static uint64_t prev = 0;
-
- // Record how how much time we have to reschedule
- if (prev && (local-prev) > emit_worst)
- emit_worst = (local-prev);
- prev = local;
-
- // Schedule task if needed
- if (emit_due && emit_period &&
- world+emit_slack > emit_due) {
- emit_schedule(emit_due);
- emit_due += emit_period;
- }
-}
-
-/************************
- * Serial I/O functions *
- ************************/
-
-static uint32_t serial_device_id = 0;
-
-const uint64_t serial_sync_delay = NSEC_PER_SEC / 100;
-static uint64_t serial_sync_due = 0;
-
-static tdma_t *serial_tdma_rcv = NULL;
-static tdma_t *serial_tdma_xmt = NULL;
-
-/**
- * Convert world to local time
- */
-uint64_t serial_read_time(ntime_t time)
-{
- return ((uint64_t)time.seconds) * NSEC_PER_SEC
- + ((uint64_t)time.nanosec);
-}
-
-ntime_t serial_write_time(uint64_t time)
-{
- ntime_t buf = {};
- buf.seconds = time / NSEC_PER_SEC;
- buf.nanosec = time % NSEC_PER_SEC;
- return buf;
-}
-
-int serial_time_stamp(tdma_t *port, uint64_t *local, uint64_t *world,
- const char *msg)
-{
- int valid = tdma_stamp(port, local);
- *world = time_to_world(*local);
-
- if (!valid)
- sirq_printf("%s -- missing\r\n", msg);
- //else
- // time_printf(msg, current);
-
- return valid;
-}
-
-/**
- * Output initialization message init message
- */
-void serial_send_init(uint16_t device, uint64_t local)
-{
-}
-
-/**
- * Output time sync message
- */
-void serial_send_sync(sirq_t *port, uint64_t now)
-{
- if (serial_sync_due == 0 || now < serial_sync_due)
- return; // not ready
-
- // Message data
- header_t head;
- sync_msg_t body;
-
- // Write header
- head.header = MSG_HEADER;
- head.msgid = MSG_ID_SYNC;
- head.length = sizeof(body);
- head.cksum = 0; // todo
-
- tdma_stop(serial_tdma_rcv, 0);
- tdma_start(serial_tdma_xmt);
-
- sirq_write(port, &head, sizeof(head));
-
- tdma_stop(serial_tdma_xmt, 100);
- tdma_start(serial_tdma_rcv);
-
- // Save transmit time
- uint64_t local = 0, world = 0;
- serial_time_stamp(serial_tdma_xmt, &local, &world,
- "sync time transmit");
-
- // Debug output
- //sirq_printf("sync time transmit\r\n");
- //time_printf(" local", local);
- //time_printf(" world", world);
-
- // Write body with updated time and send
- body.time = serial_write_time(world);
-
- sirq_write(port, &body, sizeof(body));
-
- // Queue next transmit time
- serial_sync_due = 0;
-}
-
-/**
- * Output external event received message
- * event: id of the received event
- * time: compensated timestamp of the event
- */
-void serial_send_event(sirq_t *port, uint16_t event, uint64_t local)
-{
- //time_printf("event received", local);
-
- // Convert timestamp
- uint64_t world = time_to_world(local);
- ntime_t ltime = serial_write_time(local);
- ntime_t wtime = serial_write_time(world);
-
- // Message data
- header_t head = {};
- event_msg_t body = {};
-
- // Transmit sync message
- head.header = MSG_HEADER;
- head.msgid = MSG_ID_EVENT;
- head.length = sizeof(body);
- head.cksum = 0; // todo
-
- body.device = serial_device_id;
- body.event = event;
- body.world = wtime;
- body.local = ltime;
-
- // Transmit message to BBB
- sirq_write(port, &head, sizeof(head));
- sirq_write(port, &body, sizeof(body));
-}
-
-/**
- * Handle init message
- */
-void serial_handle_init(int msgid, init_msg_t *msg)
-{
- sirq_printf("initialize: %s %s %s %s %s\r\n",
- msg->valid & MSG_VALID_DEVICE ? "DEV" : "dev",
- msg->valid & MSG_VALID_START ? "START" : "start",
- msg->valid & MSG_VALID_PERIOD ? "PERIOD" : "period",
- msg->valid & MSG_VALID_WORLD ? "WORLD" : "world",
- msg->valid & MSG_VALID_SYNC ? "SYNC" : "sync");
- sirq_printf(" dev -- %d\r\n", msg->device);
- time_printf(" start ", serial_read_time(msg->start));
- time_printf(" period", serial_read_time(msg->period));
- time_printf(" world ", serial_read_time(msg->world));
-
- if (msg->valid & MSG_VALID_DEVICE)
- serial_device_id = msg->device;
-
- if (msg->valid & MSG_VALID_START ||
- msg->valid & MSG_VALID_PERIOD) {
- uint64_t start = serial_read_time(msg->start);
- uint64_t period = serial_read_time(msg->period);
- emit_enable(start, period);
- }
-
- if (msg->valid & MSG_VALID_WORLD) {
- uint64_t world = serial_read_time(msg->world);
- uint64_t local = tdma_time();
- time_ext_init(local, world);
- }
-
- if (msg->valid & MSG_VALID_SYNC)
- serial_sync_due = tdma_time() + serial_sync_delay;
-}
-
-/**
- * Handle sync message
- */
-void serial_handle_sync(int msgid, sync_msg_t *msg)
-{
- // Read receive timestamp
- uint64_t local = 0, world = 0;
- serial_time_stamp(serial_tdma_rcv, &local, &world,
- "sync time receive ");
- tdma_stop(serial_tdma_rcv, 0);
-
- // Lookup reference time from message
- uint64_t reference = serial_read_time(msg->time);
-
- // Debug output
- //sirq_printf("sync time receive\r\n");
- //time_printf(" local", local);
- //time_printf(" world", world);
- //time_printf(" ref ", reference);
-
- // Synchronize the clocks
- time_ext_sync(local, reference);
-
- // Queue transmit to other board
- serial_sync_due = tdma_time() + serial_sync_delay;
-}
+// Macros
+#define N_ELEM(x) (sizeof(x) / sizeof((x)[0]))
-/**
- * Handle event message
- */
-void serial_handle_event(int msgid, event_msg_t *msg)
-{
-}
+// Task entry
+typedef struct {
+ void (*task)(uint64_t, uint64_t);
+ uint64_t period;
+ uint64_t due;
+} task_t;
+
+// Task functions
+void task_serial(uint64_t local, uint64_t world);
+void task_events(uint64_t local, uint64_t world);
+void task_sync(uint64_t local, uint64_t world);
+void task_leds(uint64_t local, uint64_t world);
+void task_emit(uint64_t local, uint64_t world);
+void task_debug(uint64_t local, uint64_t world);
+
+// Task table
+task_t tasks[] = {
+ { task_serial, 0 }, // always
+ { task_events, 0 }, // always -- testing
+ { task_sync, 0 }, // always
+ { task_emit, 0 }, // always
+ { task_leds, 100000000 }, // 10hz
+ { task_debug, 1000000000 }, // 1hz
+};
/********************
* Data definitions *
#endif
if (tdma_stamp(tdma_evt, &event))
- serial_send_event(sirq_bbb, 0, event);
+ comm_send_event(sirq_bbb, 0, event);
tdma_stop(tdma_evt, 0);
tdma_start(tdma_evt);
}
void task_sync(uint64_t local, uint64_t world)
{
- serial_send_sync(sirq_mbed, local);
+ comm_send_sync(sirq_mbed, local);
}
void task_leds(uint64_t local, uint64_t world)
//sirq_debug(sirq_mbed);
- serial_send_event(sirq_bbb, 1, local);
+ comm_send_event(sirq_bbb, 1, local);
#ifdef VERBOSE
sirq_printf("background - %6u.%02u -> %u.%02u\r\n",
* Main *
********/
-#define N_ELEM(x) (sizeof(x) / sizeof((x)[0]))
-
-extern void test_main(void);
-extern serial_t stdio_uart;
-
-static struct {
- void (*task)(uint64_t, uint64_t);
- uint64_t period;
- uint64_t due;
-} tasks[] = {
- { task_serial, 0 }, // always
- { task_events, 0 }, // always -- testing
- { task_sync, 0 }, // always
- { task_emit, 0 }, // always
- { task_leds, 100000000 }, // 10hz
- { task_debug, 1000000000 }, // 1hz
-};
-
void background(void)
{
// Debugging
int main(int argc, char **argv)
{
- tdma_init();
-
// Open serial ports
sirq_dbg = sirq_open(SIRQ_UART0, USBTX, USBRX, 115200); // to pc
sirq_bbb = sirq_open(SIRQ_UART1, PTE0, PTE1, 115200); // to bbb
tdma_rcv = tdma_open(TDMA_CHAN2, 3, PTD2, PullUp); // time sync rcv
tdma_xmt = tdma_open(TDMA_CHAN3, 3, PTD3, PullUp); // time sync xmt
+ // Setup event generation
+ time_init();
+ emit_init(3, PTE20, PullDown);
+ comm_init(sirq_dbg, sirq_bbb, sirq_mbed,
+ tdma_rcv, tdma_xmt);
+
// Register messages
- msg_register(&parser_dbg, MSG_ID_INIT, (handler_t)serial_handle_init);
- msg_register(&parser_dbg, MSG_ID_SYNC, (handler_t)serial_handle_sync);
- msg_register(&parser_dbg, MSG_ID_EVENT, (handler_t)serial_handle_event);
- msg_register(&parser_bbb, MSG_ID_INIT, (handler_t)serial_handle_init);
- msg_register(&parser_mbed, MSG_ID_SYNC, (handler_t)serial_handle_sync);
+ msg_register(&parser_dbg, MSG_ID_INIT, (handler_t)comm_handle_init);
+ msg_register(&parser_dbg, MSG_ID_SYNC, (handler_t)comm_handle_sync);
+ msg_register(&parser_dbg, MSG_ID_EVENT, (handler_t)comm_handle_event);
+
+ msg_register(&parser_bbb, MSG_ID_INIT, (handler_t)comm_handle_init);
+
+ msg_register(&parser_mbed, MSG_ID_SYNC, (handler_t)comm_handle_sync);
+ msg_register(&parser_mbed, MSG_ID_EVENT, (handler_t)comm_handle_event);
// start timers
tdma_start(tdma_evt);
tdma_start(tdma_rcv);
tdma_start(tdma_xmt);
- // Serial timestamping
- serial_tdma_rcv = tdma_rcv;
- serial_tdma_xmt = tdma_xmt;
-
- // Setup event generation
- emit_init(3, PTE20, PullDown);
-
// Run background loop
while (true)
background();
- // Run tests
- //test_main();
-
return 0;
}
--- /dev/null
+#include <stdint.h>
+
+#include "messages.h"
+
+#include "serial_irq.h"
+#include "timer_dma.h"
+
+#include "main_time.h"
+#include "main_emit.h"
+
+/***************************
+ * Communication functions *
+ ***************************/
+
+static uint32_t comm_device_id = 0;
+
+const uint64_t comm_sync_delay = NSEC_PER_SEC / 100;
+static uint64_t comm_sync_due = 0;
+
+static sirq_t *comm_sirq_dbg = 0;
+static sirq_t *comm_sirq_bbb = 0;
+static sirq_t *comm_sirq_mbed = 0;
+
+static tdma_t *comm_tdma_rcv = 0;
+static tdma_t *comm_tdma_xmt = 0;
+
+/**
+ * Initialization
+ */
+void comm_init(sirq_t *dbg, sirq_t *bbb, sirq_t *mbed,
+ tdma_t *rcv, tdma_t *xmt)
+{
+ comm_sirq_dbg = dbg;
+ comm_sirq_bbb = bbb;
+ comm_sirq_mbed = mbed;
+
+ comm_tdma_rcv = rcv;
+ comm_tdma_xmt = xmt;
+}
+
+/**
+ * Convert world to local time
+ */
+uint64_t comm_read_time(ntime_t time)
+{
+ return ((uint64_t)time.seconds) * NSEC_PER_SEC
+ + ((uint64_t)time.nanosec);
+}
+
+ntime_t comm_write_time(uint64_t time)
+{
+ ntime_t buf = {};
+ buf.seconds = time / NSEC_PER_SEC;
+ buf.nanosec = time % NSEC_PER_SEC;
+ return buf;
+}
+
+int comm_time_stamp(tdma_t *port, uint64_t *local, uint64_t *world,
+ const char *msg)
+{
+ int valid = tdma_stamp(port, local);
+ *world = time_to_world(*local);
+
+ if (!valid)
+ sirq_printf("%s -- missing\r\n", msg);
+ //else
+ // time_printf(msg, current);
+
+ return valid;
+}
+
+/**
+ * Output initialization message init message
+ */
+void comm_send_init(uint16_t device, uint64_t local)
+{
+}
+
+/**
+ * Output time sync message
+ */
+void comm_send_sync(sirq_t *port, uint64_t now)
+{
+ if (comm_sync_due == 0 || now < comm_sync_due)
+ return; // not ready
+
+ // Message data
+ header_t head;
+ sync_msg_t body;
+
+ // Write header
+ head.header = MSG_HEADER;
+ head.msgid = MSG_ID_SYNC;
+ head.length = sizeof(body);
+ head.cksum = 0; // todo
+
+ tdma_stop(comm_tdma_rcv, 0);
+ tdma_start(comm_tdma_xmt);
+
+ sirq_write(port, &head, sizeof(head));
+
+ tdma_stop(comm_tdma_xmt, 100);
+ tdma_start(comm_tdma_rcv);
+
+ // Save transmit time
+ uint64_t local = 0, world = 0;
+ comm_time_stamp(comm_tdma_xmt, &local, &world,
+ "sync time transmit");
+
+ // Debug output
+ //sirq_printf("sync time transmit\r\n");
+ //time_printf(" local", local);
+ //time_printf(" world", world);
+
+ // Write body with updated time and send
+ body.time = comm_write_time(world);
+
+ sirq_write(port, &body, sizeof(body));
+
+ // Queue next transmit time
+ comm_sync_due = 0;
+}
+
+/**
+ * Output external event received message
+ * event: id of the received event
+ * time: compensated timestamp of the event
+ */
+void comm_send_event(sirq_t *port, uint16_t event, uint64_t local)
+{
+ //time_printf("event received", local);
+
+ // Convert timestamp
+ uint64_t world = time_to_world(local);
+ ntime_t ltime = comm_write_time(local);
+ ntime_t wtime = comm_write_time(world);
+
+ // Message data
+ header_t head = {};
+ event_msg_t body = {};
+
+ // Transmit sync message
+ head.header = MSG_HEADER;
+ head.msgid = MSG_ID_EVENT;
+ head.length = sizeof(body);
+ head.cksum = 0; // todo
+
+ body.device = comm_device_id;
+ body.event = event;
+ body.world = wtime;
+ body.local = ltime;
+
+ // Transmit message to BBB
+ sirq_write(port, &head, sizeof(head));
+ sirq_write(port, &body, sizeof(body));
+}
+
+/**
+ * Handle init message
+ */
+void comm_handle_init(int msgid, init_msg_t *body)
+{
+ sirq_printf("initialize: %s %s %s %s %s\r\n",
+ body->valid & MSG_VALID_DEVICE ? "DEV" : "dev",
+ body->valid & MSG_VALID_START ? "START" : "start",
+ body->valid & MSG_VALID_PERIOD ? "PERIOD" : "period",
+ body->valid & MSG_VALID_WORLD ? "WORLD" : "world",
+ body->valid & MSG_VALID_SYNC ? "SYNC" : "sync");
+ sirq_printf(" dev -- %d\r\n", body->device);
+ time_printf(" start ", comm_read_time(body->start));
+ time_printf(" period", comm_read_time(body->period));
+ time_printf(" world ", comm_read_time(body->world));
+
+ if (body->valid & MSG_VALID_DEVICE)
+ comm_device_id = body->device;
+
+ if (body->valid & MSG_VALID_START ||
+ body->valid & MSG_VALID_PERIOD) {
+ uint64_t start = comm_read_time(body->start);
+ uint64_t period = comm_read_time(body->period);
+ emit_enable(start, period);
+ }
+
+ if (body->valid & MSG_VALID_WORLD) {
+ uint64_t world = comm_read_time(body->world);
+ uint64_t local = tdma_time();
+ time_ext_init(local, world);
+ }
+
+ if (body->valid & MSG_VALID_SYNC)
+ comm_sync_due = tdma_time() + comm_sync_delay;
+}
+
+/**
+ * Handle sync message
+ */
+void comm_handle_sync(int msgid, sync_msg_t *body)
+{
+ // Read receive timestamp
+ uint64_t local = 0, world = 0;
+ comm_time_stamp(comm_tdma_rcv, &local, &world,
+ "sync time receive ");
+ tdma_stop(comm_tdma_rcv, 0);
+
+ // Lookup reference time from message
+ uint64_t reference = comm_read_time(body->time);
+
+ // Debug output
+ //sirq_printf("sync time receive\r\n");
+ //time_printf(" local", local);
+ //time_printf(" world", world);
+ //time_printf(" ref ", reference);
+
+ // Synchronize the clocks
+ time_ext_sync(local, reference);
+
+ // Queue transmit to other board
+ comm_sync_due = tdma_time() + comm_sync_delay;
+}
+
+/**
+ * Handle event message
+ */
+void comm_handle_event(header_t *head, event_msg_t *body)
+{
+ // Relay event from mbed to bbb
+ if (comm_device_id == 1) {
+ sirq_write(comm_sirq_bbb, &head, sizeof(head));
+ sirq_write(comm_sirq_bbb, &body, sizeof(body));
+ }
+}
--- /dev/null
+#include <stdint.h>
+
+#include "serial_irq.h"
+#include "main_time.h"
+#include "main_emit.h"
+
+/*********************
+ * Signal generation *
+ *********************/
+
+// for 50 Mhz clock 50/1000 = 1/20 (PLL/2)
+
+// for 48 Mhz clock 48/1000 = 6/125 (FLL)
+// for 24 Mhz clock, 24/1000 = 3/125
+// for 12 Mhz clock, 12/1000 = 3/250
+// for 6 Mhz clock, 6/1000 = 3/500
+// for 3 Mhz clock, 3/1000 = 3/1000
+
+#define EMIT_PS 1
+
+//#if EMIT_PS == 0
+//#define EMIT_CLOCKS(nsec) ((uint16_t)((nsec) / 20))
+//#define EMIT_NSEC(clocks) ((uint16_t)((clocks) * 20))
+
+#if EMIT_PS == 0
+#define EMIT_CLOCKS(nsec) ((uint32_t)((nsec) * 6 / 125))
+#define EMIT_NSEC(clocks) ((uint32_t)((clocks) * 125 / 6))
+#elif EMIT_PS == 1
+#define EMIT_CLOCKS(nsec) ((uint32_t)((nsec) * 3 / 125))
+#define EMIT_NSEC(clocks) ((uint32_t)((clocks) * 125 / 3))
+#elif EMIT_PS == 2
+#define EMIT_CLOCKS(nsec) ((uint32_t)((nsec) * 3 / 250))
+#define EMIT_NSEC(clocks) ((uint32_t)((clocks) * 250 / 3))
+#elif EMIT_PS == 3
+#define EMIT_CLOCKS(nsec) ((uint32_t)((nsec) * 3 / 500))
+#define EMIT_NSEC(clocks) ((uint32_t)((clocks) * 500 / 3))
+#elif EMIT_PS == 4
+#define EMIT_CLOCKS(nsec) ((uint32_t)((nsec) * 3 / 1000))
+#define EMIT_NSEC(clocks) ((uint32_t)((clocks) * 1000 / 3))
+#endif
+
+static uint32_t *emit_pcr = 0; // transmit pin name
+
+static uint64_t emit_start = 0; // transmit start time (world time)
+static uint64_t emit_period = 0; // transmit period
+static uint64_t emit_due = 0; // next transmit (world time)
+
+static uint32_t emit_slack = 0; // how far ahead we need to schedule, in us
+static uint32_t emit_worst = 0; // worst-case latency in task table
+
+void emit_init(int alt, PinName pin, PinMode mode)
+{
+ // Find pin
+ emit_pcr = (uint32_t*)(PORTA_BASE + pin);
+
+ // Enable clocks
+ SIM->SCGC6 |= SIM_SCGC6_TPM1_MASK;
+ SIM->SOPT2 |= SIM_SOPT2_TPMSRC(1);
+
+ // Reset PLL Source
+ //SIM->SOPT2 &= ~SIM_SOPT2_PLLFLLSEL_MASK;
+
+ // Debug print on SOPT2
+ // -- mbed may set PLLFLL when configuring UART0
+ // SOPT2: u0src=1 tpmsrc=1 USBSRC PLL/2 clkos=0 rtcos
+ sirq_printf("SOPT2: u0src=%d tpmsrc=%d %s %s clkos=%d %s\r\n",
+ (SIM->SOPT2 & SIM_SOPT2_UART0SRC_MASK) >> SIM_SOPT2_UART0SRC_SHIFT,
+ (SIM->SOPT2 & SIM_SOPT2_TPMSRC_MASK) >> SIM_SOPT2_TPMSRC_SHIFT,
+ (SIM->SOPT2 & SIM_SOPT2_UART0SRC_MASK) ? "USBSRC" : "usbsrc",
+ (SIM->SOPT2 & SIM_SOPT2_PLLFLLSEL_MASK) ? "PLL/2" : "FLL",
+ (SIM->SOPT2 & SIM_SOPT2_CLKOUTSEL_MASK) >> SIM_SOPT2_CLKOUTSEL_SHIFT,
+ (SIM->SOPT2 & SIM_SOPT2_RTCCLKOUTSEL_MASK) ? "RTCOS" : "rtcos");
+
+ // Set pin mode
+ emit_pcr[0] = PORT_PCR_ISF_MASK
+ | PORT_PCR_MUX(alt)
+ | mode;
+
+ // Setup Timer/PWM Module
+ TPM1->SC = TPM_SC_TOF_MASK;
+ TPM1->CNT = TPM_CNT_COUNT(0);
+ TPM1->MOD = TPM_MOD_MOD(0xFFFF);
+
+ TPM1->CONTROLS[0].CnSC = TPM_CnSC_CHF_MASK // clear flag
+ | TPM_CnSC_MSB_MASK // set output highon match,
+ | TPM_CnSC_ELSB_MASK // cleared on overflow
+ | TPM_CnSC_ELSA_MASK; // ..
+
+ TPM1->STATUS = TPM_STATUS_CH0F_MASK
+ | TPM_STATUS_TOF_MASK;
+
+ TPM1->CONF = TPM_CONF_CSOO_MASK;
+}
+
+void emit_enable(uint64_t start, uint64_t period)
+{
+ const int slack_clocks = 0x4000; // tune based on emit_worst
+
+ emit_start = start;
+ emit_period = period;
+ emit_due = start + period;
+
+ emit_slack = EMIT_NSEC(slack_clocks);
+
+ time_printf("emit scheduled", emit_due);
+}
+
+void emit_schedule(uint64_t when)
+{
+ uint64_t local = time_to_local(when) * 3 / 125;
+ uint32_t width = EMIT_CLOCKS(10000);
+
+ // Disable timer
+ TPM1->SC = TPM_SC_TOF_MASK;
+
+ __disable_irq();
+
+ uint64_t now = ((uint64_t)~PIT->LTMR64H << 32)
+ | ((uint64_t)~PIT->LTMR64L);
+ uint32_t delta = local - now;
+ uint32_t start = delta >> (EMIT_PS-1); // convert to clocks
+ uint32_t stop = start + width; // end time
+
+ // Set transmit time
+ TPM1->CONTROLS[0].CnV = start;
+ TPM1->MOD = TPM_MOD_MOD(stop);
+
+ // Start the timer
+ TPM1->SC = TPM_SC_TOF_MASK
+ | TPM_SC_PS(EMIT_PS)
+ | TPM_SC_CMOD(1);
+
+ __enable_irq();
+
+ // Test
+ //int64_t cnv = TPM1->CONTROLS[0].CnV;
+ //int64_t mod = TPM1->MOD;
+ //int64_t due = local - tdma_time();
+ //sirq_printf("%6d -- cnv=%04x mod=%04x due=%04x start=%04x\r\n",
+ // (int)(cnv - EMIT_CLOCKS(due)),
+ // (int)cnv, (int)mod,
+ // (int)EMIT_CLOCKS(due), EMIT_CLOCKS(start));
+
+ // Clock testing
+ //uint32_t test_tpm0 = TPM1->CNT;
+ //uint32_t test_pit0 = ~PIT->CHANNEL[0].CVAL;
+ //for (int i = 0; i < 100; i++)
+ // asm("nop");
+ //uint32_t test_tpm1 = TPM1->CNT;
+ //uint32_t test_pit1 = ~PIT->CHANNEL[0].CVAL;
+
+ //uint32_t test_tpm = test_tpm1 - test_tpm0;
+ //uint32_t test_pit = test_pit1 - test_pit0;
+ //sirq_printf("pit/tpm: %d - tpm=%08x/%08x=%d pit=%08x/%08x=%d\r\n",
+ // test_tpm - test_pit,
+ // test_tpm0, test_tpm1, test_tpm,
+ // test_pit0, test_pit1, test_pit);
+
+ // Debug output
+ //time_printf("emitting event", when);
+}
+
+void emit_transmit(uint64_t local, uint64_t world)
+{
+ static uint64_t prev = 0;
+
+ // Record how how much time we have to reschedule
+ if (prev && (local-prev) > emit_worst)
+ emit_worst = (local-prev);
+ prev = local;
+
+ // Schedule task if needed
+ if (emit_due && emit_period &&
+ world+emit_slack > emit_due) {
+ emit_schedule(emit_due);
+ emit_due += emit_period;
+ }
+}
+
projects / ~andy / csm213a-hw / commitdiff