* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include <fx2macros.h>
#include <delay.h>
#include <setupdat.h>
+#define SET_ANALOG_MODE()
+
+/* Toggle the 1kHz calibration pin, only accurate up to ca. 8MHz. */
+#define TOGGLE_CALIBRATION_PIN() PA7 = !PA7
+
/* Change to support as many interfaces as you need. */
static BYTE altiface = 0;
void timer2_isr(void) __interrupt TF2_ISR
{
- PA7 = !PA7;
+ TOGGLE_CALIBRATION_PIN();
+
if (ledcounter) {
if (--ledcounter == 0) {
/* Clear LED. */
PC1 = 1;
}
}
+
TF2 = 0;
}
{
int i;
+ SET_ANALOG_MODE();
+
clear_fifo();
for (i = 0; i < 1000; i++);
IFCONFIG = samplerates[i].ifcfg;
AUTOPTRSETUP = 7;
- AUTOPTRH2 = 0xE4;
+ AUTOPTRH2 = 0xE4; /* 0xE400: GPIF waveform descriptor 0. */
AUTOPTRL2 = 0x00;
/*
* The program for low-speed, e.g. 1 MHz, is:
- * wait 24, CTL2=0, FIFO
- * wait 23, CTL2=1
- * jump 0, CTL2=1
+ * wait 24, CTLx=0, FIFO
+ * wait 23, CTLx=1
+ * jump 0, CTLx=1
*
* The program for 24 MHz is:
- * wait 1, CTL2=0, FIFO
- * jump 0, CTL2=1
+ * wait 1, CTLx=0, FIFO
+ * jump 0, CTLx=1
*
* The program for 30/48 MHz is:
- * jump 0, CTL2=Z, FIFO, LOOP
+ * jump 0, CTLx=Z, FIFO, LOOP
+ *
+ * (CTLx is device-dependent, could be e.g. CTL0 or CTL2.)
*/
+ /* LENGTH / BRANCH 0-7 */
EXTAUTODAT2 = samplerates[i].wait0;
EXTAUTODAT2 = samplerates[i].wait1;
EXTAUTODAT2 = 1;
EXTAUTODAT2 = 0;
EXTAUTODAT2 = 0;
+ /* OPCODE 0-7 */
EXTAUTODAT2 = samplerates[i].opc0;
EXTAUTODAT2 = samplerates[i].opc1;
- EXTAUTODAT2 = 1;
+ EXTAUTODAT2 = 1; /* DATA=0 DP=1 */
EXTAUTODAT2 = 0;
EXTAUTODAT2 = 0;
EXTAUTODAT2 = 0;
EXTAUTODAT2 = 0;
EXTAUTODAT2 = 0;
+ /* OUTPUT 0-7 */
EXTAUTODAT2 = samplerates[i].out0;
- EXTAUTODAT2 = 0x44;
- EXTAUTODAT2 = 0x44;
- EXTAUTODAT2 = 0x00;
- EXTAUTODAT2 = 0x00;
- EXTAUTODAT2 = 0x00;
- EXTAUTODAT2 = 0x00;
- EXTAUTODAT2 = 0x00;
+ EXTAUTODAT2 = 0x44; /* OE2=1, CTL2=1 */
+ EXTAUTODAT2 = 0x44; /* OE2=1, CTL2=1 */
+ EXTAUTODAT2 = 0;
+ EXTAUTODAT2 = 0;
+ EXTAUTODAT2 = 0;
+ EXTAUTODAT2 = 0;
+ EXTAUTODAT2 = 0;
+ /* LOGIC FUNCTION 0-7 */
EXTAUTODAT2 = 0;
EXTAUTODAT2 = 0;
EXTAUTODAT2 = 0;
EP4CFG = 0;
EP8CFG = 0;
+ SET_ANALOG_MODE();
+
/* In idle mode tristate all outputs. */
- GPIFIDLECTL = 0x00;
- GPIFCTLCFG = 0x80;
+ GPIFIDLECTL = 0x00; /* Don't enable CTL0-5 outputs. */
+ GPIFCTLCFG = 0x80; /* TRICTL=1. CTL0-2: CMOS outputs, tri-statable. */
GPIFWFSELECT = 0x00;
GPIFREADYSTAT = 0x00;
/* Init timer2. */
RCAP2L = -500 & 0xff;
- RCAP2H = (-500 >> 8) & 0xff;
+ RCAP2H = (-500 & 0xff00) >> 8;
T2CON = 0;
ET2 = 1;
TR2 = 1;
dosuspend = FALSE;
do {
/* Make sure ext wakeups are cleared. */
- WAKEUPCS |= bmWU|bmWU2;
+ WAKEUPCS |= bmWU | bmWU2;
SUSPEND = 1;
PCON |= 1;
__asm