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drivers/sensors/mlx90614.c: Fix MLX90614 to reflash new device address

This commit is contained in:
Alan Carvalho de Assis 2018-11-02 07:05:40 -06:00 committed by Gregory Nutt
parent 9f2cb42918
commit 2129ce134c
1 changed files with 29 additions and 15 deletions
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44
drivers/sensors/mlx90614.c
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@ -46,6 +46,7 @@
#include <nuttx/kmalloc.h>
#include <nuttx/fs/fs.h>
#include <nuttx/signal.h>
#include <nuttx/i2c/i2c_master.h>
#include <nuttx/sensors/ioctl.h>
#include <nuttx/sensors/mlx90614.h>
@ -200,6 +201,7 @@ static int mlx90614_write_word(FAR struct mlx90614_dev_s *priv, uint8_t cmd,
{
struct i2c_config_s config;
uint8_t pkgcrc[5];
uint8_t *buffer;
uint8_t crc;
int ret;
@ -211,20 +213,23 @@ static int mlx90614_write_word(FAR struct mlx90614_dev_s *priv, uint8_t cmd,
/* First write 0x00 0x00 to erase the EEPROM */
pkgcrc[0] = cmd;
pkgcrc[1] = 0x00;
pkgcrc[0] = I2C_WRITEADDR8(priv->addr);
pkgcrc[1] = cmd;
pkgcrc[2] = 0x00;
pkgcrc[3] = 0x00;
/* Generate the CRC to put in the PEC field */
crc = crc8ccitt(pkgcrc, 3);
crc = crc8ccitt(pkgcrc, 4);
sninfo("Generated CRC: 0x%02X\n", crc);
pkgcrc[3] = crc;
pkgcrc[4] = crc;
buffer = &(pkgcrc[1]);
/* Write the Command + 2 Bytes + PEC to device */
ret = i2c_write(priv->i2c, &config, (FAR const uint8_t *) pkgcrc, 4);
ret = i2c_write(priv->i2c, &config, (FAR const uint8_t *) buffer, 4);
if (ret < 0)
{
snerr ("i2c_writeread failed: %d\n", ret);
@ -233,30 +238,33 @@ static int mlx90614_write_word(FAR struct mlx90614_dev_s *priv, uint8_t cmd,
/* Wait the EEPROM erase */
nxsig_usleep(100 * 1000);
nxsig_usleep(10 * 1000);
/* Create the I2C command that will be sent to device */
pkgcrc[0] = cmd;
pkgcrc[1] = (regval & 0xff);
pkgcrc[2] = (regval & 0xff00) >> 8;
pkgcrc[0] = I2C_WRITEADDR8(priv->addr);
pkgcrc[1] = cmd;
pkgcrc[2] = (regval & 0xff);
pkgcrc[3] = (regval & 0xff00) >> 8;
/* Generate the CRC to put in the PEC field */
crc = crc8ccitt(pkgcrc, 3);
crc = crc8ccitt(pkgcrc, 4);
sninfo("Generated CRC: 0x%02X\n", crc);
pkgcrc[3] = crc;
pkgcrc[4] = crc;
/* Write the Command + 2 Bytes + PEC to device */
ret = i2c_write(priv->i2c, &config, (FAR const uint8_t *) pkgcrc, 4);
ret = i2c_write(priv->i2c, &config, (FAR const uint8_t *) buffer, 4);
if (ret < 0)
{
snerr ("i2c_writeread failed: %d\n", ret);
return ret;
}
sninfo("New address 0x%02x stored correctly!\n", regval);
return OK;
}
@ -376,18 +384,24 @@ static int mlx90614_ioctl(FAR struct file *filep, int cmd,
case SNIOC_CHANGE_SMBUSADDR:
{
FAR struct mlx90614_dev_s newdev;
FAR uint8_t *ptr = (FAR uint8_t *)((uintptr_t)arg);
uint16_t newaddr;
uint8_t smbcmd;
/* EEPROM reflash only happen when sent at I2C address 0x00 */
newdev.i2c = priv->i2c;
newdev.addr = 0x00;
/* The I2C address is put in the high byte position */
newaddr = (uint16_t) (*ptr << 8);
snerr("Setting new address: 0x%02x\n", newaddr);
newaddr = (uint16_t) *ptr;
sninfo("Setting new address: 0x%02x\n", newaddr);
smbcmd = MLX90614_CMD_EEPROM_ACCESS | MLX90614_SMBUS_ADDR;
ret = mlx90614_write_word(priv, smbcmd, newaddr);
ret = mlx90614_write_word(&newdev, smbcmd, newaddr);
if (ret < 0)
{
snerr("ERROR: Failed to change the I2C/SMBus address!\n");