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/* 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);
}
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