X-Git-Url: http://sigrok.org/gitweb/?a=blobdiff_plain;f=gpif-acquisition.c;h=39e62e582deb997939dd652cdf1763ce76dc4b14;hb=c610cc7e94974d40e8bb6fd99acfb585f40fcc12;hp=b44fbc078cbcc6e9659a841aa6f7a76201f381eb;hpb=a371bdee728dac611e020aee9219a0b5af15b5af;p=sigrok-firmware-fx2lafw.git

diff --git a/gpif-acquisition.c b/gpif-acquisition.c
index b44fbc07..39e62e58 100644
--- a/gpif-acquisition.c
+++ b/gpif-acquisition.c
@@ -27,7 +27,7 @@
 #include <fx2lafw.h>
 #include <gpif-acquisition.h>
 
-bit gpif_acquiring;
+__bit gpif_acquiring;
 
 static void gpif_reset_waveforms(void)
 {
@@ -71,7 +71,7 @@ static void gpif_setup_registers(void)
 	/* Contains RDY* pin values. Read-only according to TRM. */
 	GPIFREADYSTAT = 0;
 
-	/* Make GPIF stop on transcation count not flag */
+	/* Make GPIF stop on transaction count not flag. */
 	EP2GPIFPFSTOP = (0 << 0);
 }
 
@@ -128,7 +128,7 @@ void gpif_init_la(void)
 	/* Initialize flowstate registers (not used by us). */
 	gpif_init_flowstates();
 
-	/* Reset the status */
+	/* Reset the status. */
 	gpif_acquiring = FALSE;
 }
 
@@ -188,13 +188,22 @@ static void gpid_make_data_dp_state(volatile BYTE *pSTATE)
 	pSTATE[24] = (6 << 3) | (6 << 0);
 }
 
-void gpif_acquisition_start(const struct cmd_start_acquisition *cmd)
+bool gpif_acquisition_start(const struct cmd_start_acquisition *cmd)
 {
-	xdata volatile BYTE *pSTATE;
+	int i;
+	volatile BYTE *pSTATE = &GPIF_WAVE_DATA;
 
 	/* Ensure GPIF is idle before reconfiguration. */
 	while (!(GPIFTRIG & 0x80));
 
+	/* Configure the EP2 FIFO. */
+	if (cmd->flags & CMD_START_FLAGS_SAMPLE_16BIT) {
+		EP2FIFOCFG = bmAUTOIN | bmWORDWIDE;
+	} else {
+		EP2FIFOCFG = bmAUTOIN;
+	}
+	SYNCDELAY();
+
 	/* Set IFCONFIG to the correct clock source. */
 	if (cmd->flags & CMD_START_FLAGS_CLK_48MHZ) {
 		IFCONFIG = bmIFCLKSRC | bm3048MHZ | bmIFCLKOE | bmASYNC |
@@ -204,29 +213,19 @@ void gpif_acquisition_start(const struct cmd_start_acquisition *cmd)
 			   bmGSTATE | bmIFGPIF;
 	}
 
-	/* GPIF terminology: DP = decision point, NDP = non-decision-point */
+	/* Populate delay states. */
+	if ((cmd->sample_delay_h == 0 && cmd->sample_delay_l == 0) ||
+	    cmd->sample_delay_h >= 6)
+		return false;
 
-	/*
-	 * Populate WAVEDATA.
-	 *
-	 * This is the basic algorithm implemented in our GPIF state machine:
-	 *
-	 * State 0: NDP: Delay for a period of time.
-	 * State 1: DP: If EP2 is full, go to state 7 (the IDLE state), i.e.,
-	 *          end the current waveform. Otherwise, sample data and go to
-	 *          state 0 again, i.e., sample data until EP2 is full.
-	 * State 2: Unused.
-	 * State 3: Unused.
-	 * State 4: Unused.
-	 * State 5: Unused.
-	 * State 6: Unused.
-	 */
+	for (i = 0; i < cmd->sample_delay_h; i++)
+		gpif_make_delay_state(pSTATE++, 0);
 
-	/* Populate S0 */
-	gpif_make_delay_state(&GPIF_WAVE_DATA, cmd->sample_delay);
+	if (cmd->sample_delay_l != 0)
+		gpif_make_delay_state(pSTATE++, cmd->sample_delay_l);
 
 	/* Populate S1 - the decision point. */
-	gpid_make_data_dp_state(&GPIF_WAVE_DATA + 1);
+	gpid_make_data_dp_state(pSTATE++);
 
 	/* Execute the whole GPIF waveform once. */
 	gpif_set_tc16(1);
@@ -236,6 +235,8 @@ void gpif_acquisition_start(const struct cmd_start_acquisition *cmd)
 
 	/* Update the status. */
 	gpif_acquiring = TRUE;
+
+	return true;
 }
 
 void gpif_poll(void)