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Date: Thu, 07 Jan 2010 20:15:29 +0100
From: "Alessio Margan @ IIT" <alessio.margan@domain.hid>
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Subject: [Xenomai-core] [PATCH] Sensoray 526 analogy driver
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To: Xenomai-core@domain.hid

Hi,

I've got a doubt about s526 driver on reading analog input.

I read analog data in this way

sampl_t data;
a4l_insn_t insn_tab =3D {
.type =3D A4L_INSN_READ,
.idx_subd =3D idx_subd,
.chan_desc =3D CHAN(idx_chan),
.data_size =3D sizeof(data),
.data =3D &data};

/* Sends the read instruction to the Analogy layer */
ret =3D a4l_snd_insn(&dsc, &insn_tab);

on driver side data_size is the number of samples not the nr of byte to=20
read,
the driver expect data_size to be the number of samples and data to be a=20
vector of samples

uint16_t *data =3D (uint16_t *)insn->data;

/* convert n samples */
for (n =3D 0; n < insn->data_size; n++) {
/* trigger conversion */
outw(value, ADDR_REG(REG_ADC));
a4l_info(dev, "s526_ai_rinsn: Wrote 0x%04x to ADC\n", value);
a4l_info(dev, "s526_ai_rinsn: ADC reg=3D0x%04x\n", inw(ADDR_REG(REG_ADC)));

#define TIMEOUT 100

/* wait for conversion to end */
for (i =3D 0; i < TIMEOUT; i++) {
status =3D inw(ADDR_REG(REG_ISR));
if (status & ISR_ADC_DONE) {
outw(ISR_ADC_DONE, ADDR_REG(REG_ISR));
break;
}
}
if (i =3D=3D TIMEOUT) {
a4l_warn(dev, "s526_ai_rinsn: ADC(0x%04x) timeout\n",=20
inw(ADDR_REG(REG_ISR)));
return -ETIMEDOUT;
}

/* read data */
d =3D inw(ADDR_REG(REG_ADD));
a4l_info(dev, "s526_ai_rinsn: AI[%d]=3D0x%04x\n", n, (unsigned short)(d &=20
0xFFFF));

/* munge data */
data[n] =3D d ^ 0x8000;
}

TIA

Alessio

--=20

ISTITUTO ITALIANO
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Alessio Margan
/Senior Technician/
mail me <mailto:alessio.margan@domain.hid>

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