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/* AT91SAM7 ADC controller routines for OpenPICC
* (C) 2006 by Harald Welte <hwelte@hmw-consulting.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#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
#define DEBUG_ADC
#ifdef DEBUG_ADC
#define DEBUGADC DEBUGP
#else
#define DEBUGADC do { } while (0)
#endif
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_irq(void)
{
uint32_t sr = adc->ADC_SR;
struct req_ctx *rctx = adc_state.rctx;
DEBUGADC("adc_irq(SR=0x%08x, IMR=0x%08x, state=%u): ",
sr, adc->ADC_IMR, adc_state.state);
switch (adc_state.state) {
case ADC_NONE:
//break;
case ADC_READ_CONTINUOUS_USB:
if (sr & AT91C_ADC_EOC4)
DEBUGADC("CDR4=0x%4x ", adc->ADC_CDR4);
if (sr & AT91C_ADC_EOC5)
DEBUGADC("CDR5=0x%4x ", adc->ADC_CDR5);
if (sr & AT91C_ADC_ENDRX) {
/* rctx full, get rid of it */
DEBUGADC("sending rctx (val=%s) ",
hexdump(rctx->data[4], 2));
req_ctx_set_state(rctx, RCTX_STATE_UDP_EP2_PENDING);
adc_state.state = ADC_NONE;
adc_state.rctx = NULL;
//AT91F_PDC_SetRx(AT91C_BASE_PDC_ADC, NULL, 0);
/* Disable EOC interrupts since we don't want to
* re-start conversion any further*/
AT91F_ADC_DisableIt(AT91C_BASE_ADC, AT91C_ADC_ENDRX);
//AT91C_ADC_EOC4|AT91C_ADC_EOC5|AT91C_ADC_ENDRX);
AT91F_PDC_DisableRx(AT91C_BASE_PDC_ADC);
DEBUGADC("disabled IT/RX ");
} else {
if (sr & (AT91C_ADC_EOC4|AT91C_ADC_EOC5)) {
/* re-start conversion, since we need more values */
AT91F_ADC_StartConversion(adc);
}
}
break;
}
AT91F_AIC_ClearIt(AT91C_BASE_AIC, AT91C_ID_ADC);
DEBUGADC("cleeared ADC IRQ in AIC\r\n");
}
#if 0
uint16_t adc_read_fieldstr(void)
{
return adc->ADC_CDR4;
}
uint16_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->data[0];
switch (poh->cmd) {
case OPENPCD_CMD_ADC_READ:
DEBUGADC("ADC_READ(chan=%u, len=%u) ", poh->reg, poh->val);
//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;
rctx->tot_len = sizeof(*poh) + poh->val * 2;
AT91F_PDC_SetRx(AT91C_BASE_PDC_ADC, rctx->data, poh->val);
AT91F_PDC_EnableRx(AT91C_BASE_PDC_ADC);
AT91F_ADC_EnableChannel(AT91C_BASE_ADC, OPENPICC_ADC_CH_FIELDSTR);
AT91F_ADC_EnableIt(AT91C_BASE_ADC, AT91C_ADC_ENDRX |
OPENPICC_ADC_CH_FIELDSTR);
AT91F_ADC_StartConversion(adc);
break;
}
}
int adc_init(void)
{
AT91F_ADC_CfgPMC();
AT91F_ADC_CfgTimings(AT91C_BASE_ADC, 48 /*MHz*/, 5 /*MHz*/,
20/*uSec*/, 700/*nSec*/);
#if 0
AT91F_ADC_EnableChannel(AT91C_BASE_ADC, OPENPICC_ADC_CH_FIELDSTR |
OPENPICC_ADC_CH_PLL_DEM);
#endif
AT91F_AIC_ConfigureIt(AT91C_BASE_AIC, AT91C_ID_ADC,
AT91C_AIC_PRIOR_LOWEST,
AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, &adc_irq);
AT91F_AIC_EnableIt(AT91C_BASE_AIC, AT91C_ID_ADC);
usb_hdlr_register(&adc_usb_in, OPENPCD_CMD_CLS_ADC);
}
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