#define SET_ANALOG_MODE() PA7 = 1
+#define SET_COUPLING(x) set_coupling(x)
+
+#define SET_CALIBRATION_PULSE(x) set_calibration_pulse(x)
+
+/* Toggle the 1kHz calibration pin, only accurate up to ca. 8MHz. */
+/* Note: There's no PE2 as IOE is not bit-addressable (see TRM 15.2). */
+#define TOGGLE_CALIBRATION_PIN() IOE = IOE ^ 0x04
+
+#define LED_CLEAR() NOP
+#define LED_GREEN() NOP
+#define LED_RED() NOP
+
+#define TIMER2_VAL 1000
+
+/* CTLx pin index (IFCLK, ADC clock input). */
+#define CTL_BIT 2
+
+#define OUT0 ((1 << CTL_BIT) << 4) /* OEx = 1, CTLx = 0 */
+#define OE_CTL (((1 << CTL_BIT) << 4) | (1 << CTL_BIT)) /* OEx = CTLx = 1 */
+
/* Change to support as many interfaces as you need. */
static BYTE altiface = 0;
+static volatile WORD ledcounter = 0;
+
static volatile __bit dosud = FALSE;
static volatile __bit dosuspend = FALSE;
void timer2_isr(void) __interrupt TF2_ISR
{
- /* Toggle the 1kHz calibration pin, only accurate up to ca. 8MHz. */
- IOE = IOE^0x04;
+ TOGGLE_CALIBRATION_PIN();
+
+ if (ledcounter && (--ledcounter == 0))
+ LED_CLEAR();
+
TF2 = 0;
}
GPIFTCB0 = 0;
GPIFTRIG = (altiface == 0) ? 6 : 4;
+ /* Set green LED, don't clear LED afterwards (ledcounter = 0). */
+ LED_GREEN();
+ ledcounter = 0;
}
static void select_interface(BYTE alt)
} samplerates[] = {
{ 48, 0x80, 0, 3, 0, 0x00, 0xea },
{ 30, 0x80, 0, 3, 0, 0x00, 0xaa },
- { 24, 1, 0, 2, 1, 0x40, 0xea },
- { 16, 1, 1, 2, 0, 0x40, 0xea },
- { 15, 1, 0, 2, 1, 0x40, 0xaa },
- { 12, 2, 1, 2, 0, 0x40, 0xea },
- { 11, 1, 1, 2, 0, 0x40, 0xaa },
- { 8, 3, 2, 2, 0, 0x40, 0xea },
- { 6, 2, 2, 2, 0, 0x40, 0xaa },
- { 5, 3, 2, 2, 0, 0x40, 0xaa },
- { 4, 6, 5, 2, 0, 0x40, 0xea },
- { 3, 5, 4, 2, 0, 0x40, 0xaa },
- { 2, 12, 11, 2, 0, 0x40, 0xea },
- { 1, 24, 23, 2, 0, 0x40, 0xea },
- { 50, 48, 47, 2, 0, 0x40, 0xea },
- { 20, 120, 119, 2, 0, 0x40, 0xea },
- { 10, 240, 239, 2, 0, 0x40, 0xea },
+ { 24, 1, 0, 2, 1, OUT0, 0xea },
+ { 16, 1, 1, 2, 0, OUT0, 0xea },
+ { 15, 1, 0, 2, 1, OUT0, 0xaa },
+ { 12, 2, 1, 2, 0, OUT0, 0xea },
+ { 11, 1, 1, 2, 0, OUT0, 0xaa },
+ { 8, 3, 2, 2, 0, OUT0, 0xea },
+ { 6, 2, 2, 2, 0, OUT0, 0xaa },
+ { 5, 3, 2, 2, 0, OUT0, 0xaa },
+ { 4, 6, 5, 2, 0, OUT0, 0xea },
+ { 3, 5, 4, 2, 0, OUT0, 0xaa },
+ { 2, 12, 11, 2, 0, OUT0, 0xea },
+ { 1, 24, 23, 2, 0, OUT0, 0xea },
+ { 50, 48, 47, 2, 0, OUT0, 0xea },
+ { 20, 120, 119, 2, 0, OUT0, 0xea },
+ { 10, 240, 239, 2, 0, OUT0, 0xea },
};
static BOOL set_samplerate(BYTE rate)
/* OUTPUT 0-7 */
EXTAUTODAT2 = samplerates[i].out0;
- EXTAUTODAT2 = 0x44; /* OE2=1, CTL2=1 */
- EXTAUTODAT2 = 0x44; /* OE2=1, CTL2=1 */
+ EXTAUTODAT2 = OE_CTL;
+ EXTAUTODAT2 = OE_CTL;
EXTAUTODAT2 = 0;
EXTAUTODAT2 = 0;
EXTAUTODAT2 = 0;
{
stop_sampling();
+ /* Set red LED, clear after timeout. */
+ LED_RED();
+ ledcounter = 1000;
+
/* Clear EP0BCH/L for each valid command. */
if (cmd >= 0xe0 && cmd <= 0xe6) {
EP0BCH = 0;
set_numchannels(EP0BUF[0]);
return TRUE;
case 0xe5:
- set_coupling(EP0BUF[0]);
+ SET_COUPLING(EP0BUF[0]);
return TRUE;
case 0xe6:
- set_calibration_pulse(EP0BUF[0]);
+ SET_CALIBRATION_PULSE(EP0BUF[0]);
return TRUE;
}
EA = 1;
/* Init timer2. */
- RCAP2L = -1000 & 0xff;
- RCAP2H = (-1000 & 0xff00) >> 8;
+ RCAP2L = -TIMER2_VAL & 0xff;
+ RCAP2H = (-TIMER2_VAL & 0xff00) >> 8;
T2CON = 0;
ET2 = 1;
TR2 = 1;
RENUMERATE_UNCOND();
+ PORTECFG = 0;
PORTCCFG = 0;
PORTACFG = 0;
- PORTECFG = 0;
- OEE = 0xFF;
+ OEE = 0xff;
OEC = 0xff;
- OEA = 0x80;
+ OEA = 0xff;
SET_ANALOG_MODE();