1 files changed, 112 insertions, 0 deletions
diff --git a/openpcd/firmware/src/picc/adc.c b/openpcd/firmware/src/picc/adc.c
new file mode 100644
index 0000000..1438a08
--- /dev/null
+++ b/openpcd/firmware/src/picc/adc.c
@@ -0,0 +1,112 @@
+/* AT91SAM7 ADC controller routines for OpenPCD / OpenPICC
+ * (C) 2006 by Harald Welte <hwelte@hmw-consulting.de>
+ *
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <sys/types.h>
+#include <AT91SAM7.h>
+#include <lib_AT91SAM7.h>
+#include <openpcd.h>
+
+#include <os/usb_handler.h>
+#include "../openpcd.h"
+#include <os/dbgu.h>
+
+#define OPENPICC_ADC_CH_FIELDSTR	AT91C_ADC_CH4
+#define OPENPICC_ADC_CH_PLL_DEM		AT91C_ADC_CH5
+
+static const AT91PS_ADC adc = AT91C_BASE_ADC;
+
+enum adc_states {
+	ADC_NONE,
+	ADC_READ_CONTINUOUS,
+	ADC_READ_CONTINUOUS_USB,
+	ADC_READ_SINGLE,
+};
+
+struct adc_state {
+	enum adc_states state;
+	struct req_ctx *rctx;
+};
+
+static struct adc_state adc_state;
+
+static void adc_int(void)
+{
+	u_int32_t sr = adc->ADC_SR;
+	struct req_ctx *rctx = adc_state.rctx;
+	u_int16_t *val = (u_int16_t *) &(rctx->tx.data[rctx->tx.tot_len]);
+
+	switch (adc_state.state) {
+	case ADC_NONE:
+		break;
+	case ADC_READ_CONTINUOUS_USB:
+		if (sr & AT91C_ADC_ENDRX) {
+			/* rctx full, get rid of it */
+			req_ctx_set_state(rctx, RCTX_STATE_UDP_EP2_PENDING);
+			adc_state.state = ADC_NONE;
+			adc_state.rctx = NULL;
+
+			/* Disable EOC interrupts since we don't want to
+			 * re-start conversion any further*/
+			AT91F_ADC_DisableIt(AT91C_BASE_ADC, 
+					    AT91C_ADC_EOC4|AT91C_ADC_EOC5);
+			AT91F_PDC_DisableRx(AT91C_BASE_PDC_ADC);
+		}
+
+		if (sr & (AT91C_ADC_EOC4|AT91C_ADC_EOC5)) {
+			/* re-start conversion, since we need more values */
+			AT91F_ADC_StartConversion(adc);
+		}
+		break;
+	}
+}
+
+#if 0
+u_int16_t adc_read_fieldstr(void)
+{
+	return adc->ADC_CDR4;
+}
+
+u_int16_T adc_read_pll_dem(void)
+{
+	return adc
+}
+#endif
+
+static int adc_usb_in(struct req_ctx *rctx)
+{
+	struct openpcd_hdr *poh = (struct openpcd_hdr *) &rctx->rx.data[0];
+	struct openpcd_hdr *pih = (struct openpcd_hdr *) &rctx->tx.data[0];
+
+	switch (poh->cmd) {
+	case OPENPCD_CMD_ADC_READ:
+		//channel = poh->reg;
+		if (adc_state.rctx) {
+			/* FIXME: do something */
+			req_ctx_put(rctx);
+		}
+
+		adc_state.state = ADC_READ_CONTINUOUS_USB;
+		adc_state.rctx = rctx;
+		AT91F_ADC_EnableChannel(AT91C_BASE_ADC, OPENPICC_ADC_CH_FIELDSTR);
+		AT91F_ADC_EnableIt(AT91C_BASE_ADC, AT91C_ADC_ENDRX |
+				   OPENPICC_ADC_CH_FIELDSTR);
+		AT91F_PDC_SetRx(AT91C_BASE_PDC_ADC, rctx->rx.data, 60 /*FIXME*/);
+		AT91F_PDC_EnableRx(AT91C_BASE_PDC_ADC);
+		break;
+	}
+}
+
+int adc_init(void)
+{
+	AT91F_ADC_CfgPMC();
+	AT91F_ADC_CfgTimings(AT91C_BASE_ADC, 48 /*MHz*/, 5 /*MHz*/,
+			     20/*uSec*/, 700/*nSec*/);
+	AT91F_ADC_EnableChannel(AT91C_BASE_ADC, OPENPICC_ADC_CH_FIELDSTR |
+				OPENPICC_ADC_CH_PLL_DEM);
+
+	usb_hdlr_register(&adc_usb_in, OPENPCD_CMD_CLS_ADC);
+}