static uint16_t ads7843e_sendcmd(FAR struct ads7843e_dev_s *priv, uint8_t cmd)
{
uint8_t buffer[2];
uint16_t result;
/* Select the ADS7843E */
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN, true);
/* Send the command */
(void)SPI_SEND(priv->spi, cmd);
/* Wait a tiny amount to make sure that the aquisition time is complete */
up_udelay(3); /* 3 microseconds */
/* Read the 12-bit data (LS 4 bits will be padded with zero) */
SPI_RECVBLOCK(priv->spi, buffer, 2);
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN, false);
result = ((uint16_t)buffer[0] << 8) | (uint16_t)buffer[1];
result = result >> 4;
ivdbg("cmd:%02x response:%04x\n", cmd, result);
return result;
}
static uint16_t max11802_sendcmd(FAR struct max11802_dev_s *priv,
uint8_t cmd, int *tags)
{
uint8_t buffer[2];
uint16_t result;
/* Select the MAX11802 */
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN, true);
/* Send the command */
(void)SPI_SEND(priv->spi, cmd);
/* Read the data */
SPI_RECVBLOCK(priv->spi, buffer, 2);
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN, false);
result = ((uint16_t)buffer[0] << 8) | (uint16_t)buffer[1];
*tags = result & 0xF;
result >>= 4; /* Get rid of tags */
iinfo("cmd:%02x response:%04x\n", cmd, result);
return result;
}
static uint16_t ads7843e_sendcmd(FAR struct ads7843e_dev_s *priv, uint8_t cmd)
{
uint8_t buffer[2];
uint16_t result;
/* Select the ADS7843E */
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN, true);
/* Send the command */
(void)SPI_SEND(priv->spi, cmd);
ads7843e_waitbusy(priv);
/* Read the data */
SPI_RECVBLOCK(priv->spi, buffer, 2);
SPI_SELECT(priv->spi, SPIDEV_TOUCHSCREEN, false);
result = ((uint16_t)buffer[0] << 8) | (uint16_t)buffer[1];
result = result >> 4;
ivdbg("cmd:%02x response:%04x\n", cmd, result);
return result;
}
static uint8_t nrf24l01_access(FAR struct nrf24l01_dev_s *dev,
nrf24l01_access_mode_t mode, uint8_t cmd, FAR uint8_t *buf, int length)
{
uint8_t status;
/* Prepare SPI */
nrf24l01_select(dev);
/* Transfer */
status = SPI_SEND(dev->spi, cmd);
switch (mode)
{
case MODE_WRITE:
if (length > 0)
{
SPI_SNDBLOCK(dev->spi, buf, length);
}
break;
case MODE_READ:
SPI_RECVBLOCK(dev->spi, buf, length);
break;
}
nrf24l01_deselect(dev);
return status;
}
uint8_t adxl345_getreg8(FAR struct adxl345_dev_s *priv, uint8_t regaddr)
{
uint8_t regval;
/* If SPI bus is shared then lock and configure it */
#ifndef CONFIG_SPI_OWNBUS
(void)SPI_LOCK(priv->spi, true);
adxl345_configspi(priv->spi);
#endif
/* Select the ADXL345 */
SPI_SELECT(priv->spi, SPIDEV_GSENSOR, true);
/* Send register to read and get the next byte */
(void)SPI_SEND(priv->spi, regaddr);
SPI_RECVBLOCK(priv->spi, ®val, 1);
/* Deselect the ADXL345 */
SPI_SELECT(priv->spi, SPIDEV_GSENSOR, false);
/* Unlock bus */
#ifndef CONFIG_SPI_OWNBUS
(void)SPI_LOCK(priv->spi, false);
#endif
#ifdef CONFIG_ADXL345_REGDEBUG
dbg("%02x->%02x\n", regaddr, regval);
#endif
return regval;
}
int pn532_read_more(struct pn532_dev_s *dev, uint8_t *buff, uint8_t n)
{
pn532_lock(dev->spi);
pn532_select(dev);
SPI_RECVBLOCK(dev->spi, buff, n);
pn532_deselect(dev);
pn532_unlock(dev->spi);
tracerx("read_more", buff, n);
return n;
}
int pn532_read(struct pn532_dev_s *dev, uint8_t *buff, uint8_t n)
{
pn532_lock(dev->spi);
pn532_select(dev);
SPI_SEND(dev->spi, PN532_SPI_DATAREAD);
SPI_RECVBLOCK(dev->spi, buff, n);
pn532_deselect(dev);
pn532_unlock(dev->spi);
tracerx("read", buff, n);
return n;
}
static ssize_t max31855_read(FAR struct file *filep, FAR char *buffer, size_t buflen)
{
FAR struct inode *inode = filep->f_inode;
FAR struct max31855_dev_s *priv = inode->i_private;
FAR uint16_t *temp = (FAR uint16_t *) buffer;
int ret = 2;
int32_t regmsb;
int32_t regval;
/* Check for issues */
if (!buffer)
{
sndbg("Buffer is null\n");
return -EINVAL;
}
if (buflen != 2)
{
sndbg("You can't read something other than 16 bits (2 bytes)\n");
return -EINVAL;
}
/* Enable MAX31855's chip select */
SPI_SELECT(priv->spi, SPIDEV_TEMPERATURE, true);
/* Read temperature */
SPI_RECVBLOCK(priv->spi, ®msb, 4);
/* Disable MAX31855's chip select */
SPI_SELECT(priv->spi, SPIDEV_TEMPERATURE, false);
regval = (regmsb & 0xFF000000) >> 24;
regval |= (regmsb & 0xFF0000) >> 8;
regval |= (regmsb & 0xFF00) << 8;
regval |= (regmsb & 0xFF) << 24;
sndbg("Read from MAX31855 = 0x%08X\n", regval);
/* If negative, fix signal bits */
if (regval & 0x80000000)
{
*temp = 0xc000 | (regval >> 18);
}
int cc1101_access(struct cc1101_dev_s * dev, uint8_t addr, uint8_t *buf, int length)
{
int stabyte;
/* Address cannot explicitly define READ command while length WRITE.
* Also access to these cells is only permitted as one byte, eventhough
* transfer is marked as BURST!
*/
if ((addr & CC1101_READ_SINGLE) && length != 1)
return ERROR;
/* Prepare SPI */
cc1101_access_begin(dev);
if (length>1 || length < -1)
SPI_SETFREQUENCY(dev->spi, CC1101_SPIFREQ_BURST);
else SPI_SETFREQUENCY(dev->spi, CC1101_SPIFREQ_SINGLE);
/* Transfer */
if (length <= 0) { /* 0 length are command strobes */
if (length < -1)
addr |= CC1101_WRITE_BURST;
stabyte = SPI_SEND(dev->spi, addr);
if (length) {
SPI_SNDBLOCK(dev->spi, buf, -length);
}
}
else {
addr |= CC1101_READ_SINGLE;
if (length > 1)
addr |= CC1101_READ_BURST;
stabyte = SPI_SEND(dev->spi, addr);
SPI_RECVBLOCK(dev->spi, buf, length);
}
cc1101_access_end(dev);
return stabyte;
}
static char spi_read(int port, int addr, int frequency, int bits, int conf)
{
unsigned char buf[2];
buf[0] = addr | 0x80;
SPI_LOCK(spi_dev, true);
SPI_SETFREQUENCY(spi_dev, frequency);
SPI_SETBITS(spi_dev, bits);
SPI_SETMODE(spi_dev, conf);
SPI_SELECT(spi_dev, port, true);
SPI_RECVBLOCK(spi_dev, buf, 2);
SPI_SELECT(spi_dev, port, false);
SPI_LOCK(spi_dev, false);
return buf[1];
}
static ssize_t max6675_read(FAR struct file *filep, FAR char *buffer, size_t buflen)
{
FAR struct inode *inode = filep->f_inode;
FAR struct max6675_dev_s *priv = inode->i_private;
FAR uint16_t *temp = (FAR uint16_t *) buffer;
int ret = 2;
int16_t regmsb;
int16_t regval;
/* Check for issues */
if (!buffer)
{
snerr("ERROR: Buffer is null\n");
return -EINVAL;
}
if (buflen != 2)
{
snerr("ERROR: You can't read something other than 16 bits (2 bytes)\n");
return -EINVAL;
}
/* Enable MAX6675's chip select */
max6675_lock(priv->spi);
SPI_SELECT(priv->spi, SPIDEV_TEMPERATURE(0), true);
/* Read temperature */
SPI_RECVBLOCK(priv->spi, ®msb, 2);
/* Disable MAX6675's chip select */
SPI_SELECT(priv->spi, SPIDEV_TEMPERATURE(0), false);
max6675_unlock(priv->spi);
regval = (regmsb & 0xFF00) >> 8;
regval |= (regmsb & 0xFF) << 8;
sninfo("Read from MAX6675 = 0x%04X\n", regval);
/* Verify if the device ID bit is really zero */
if (regval & MAX6675_DEV_ID)
{
snerr("ERROR: The Device ID bit needs to be 0 !\n");
ret = -EINVAL;
}
/* Detect if termocople input is open */
if (regval & MAX6675_OPEN_CIRCUIT)
{
snerr("ERROR: The thermocouple input is not connected!\n");
ret = -EINVAL;
}
/* Feed sensor data to entropy pool */
add_sensor_randomness(regval);
/* Get the temperature */
*temp = (regval & MAX6675_TEMP_COUPLE) >> 3;
/* Return two bytes, the temperature is fixed point Q10.2, then divide by 4
* in your application in order to get real temperature in Celsius degrees.
*/
return ret;
}
