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Make I2C frequency configurable for the AT24Cxx EEPROM driver

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Signed-off-by: Marten Svanfeldt <marten@intuitiveaerial.com>
This commit is contained in:
Marten Svanfeldt 2015-10-21 11:34:34 +08:00
parent af9590eef7
commit a31d1fd378
2 changed files with 14 additions and 3 deletions
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8
drivers/mtd/Kconfig
View File

@ -309,6 +309,14 @@ config AT24XX_EXTSIZE
Other, block-oriented access are not effected by this setting Other, block-oriented access are not effected by this setting
config AT24XX_FREQUENCY
int "AT24xx I2C bus frequency"
default 100000
---help---
Set the I2C frequency to use when accessing the AT24CXX EEPROM. This value
must represent a valid I2C speed (normally less than 400.000) or the driver
might fail.
endif endif
config MTD_AT25 config MTD_AT25

9
drivers/mtd/at24xx.c
View File

@ -78,6 +78,9 @@
# warning "Assuming AT24 address of 0x50" # warning "Assuming AT24 address of 0x50"
# define CONFIG_AT24XX_ADDR 0x50 # define CONFIG_AT24XX_ADDR 0x50
#endif #endif
#ifndef CONFIG_AT24XX_FREQUENCY
# define CONFIG_AT24XX_FREQUENCY 100000
#endif
/* Get the part configuration based on the size configuration */ /* Get the part configuration based on the size configuration */
@ -193,7 +196,7 @@ static int at24c_eraseall(FAR struct at24c_dev_s *priv)
memset(&buf[AT24XX_ADDRSIZE], 0xff, priv->pagesize); memset(&buf[AT24XX_ADDRSIZE], 0xff, priv->pagesize);
I2C_SETADDRESS(priv->dev, priv->addr, 7); I2C_SETADDRESS(priv->dev, priv->addr, 7);
I2C_SETFREQUENCY(priv->dev, 100000); I2C_SETFREQUENCY(priv->dev, CONFIG_AT24XX_FREQUENCY);
for (startblock = 0; startblock < priv->npages; startblock++) for (startblock = 0; startblock < priv->npages; startblock++)
{ {
@ -241,7 +244,7 @@ static ssize_t at24c_read_internal(FAR struct at24c_dev_s *priv, off_t offset,
fvdbg("offset: %lu nbytes: %lu address: %02x\n", fvdbg("offset: %lu nbytes: %lu address: %02x\n",
(unsigned long)offset, (unsigned long)nbytes, address); (unsigned long)offset, (unsigned long)nbytes, address);
I2C_SETFREQUENCY(priv->dev, 100000); I2C_SETFREQUENCY(priv->dev, CONFIG_AT24XX_FREQUENCY);
/* "Random Read: A Random Read requires a dummy byte write sequence to load in the /* "Random Read: A Random Read requires a dummy byte write sequence to load in the
* data word address. Once the device address word and data word address are clocked * data word address. Once the device address word and data word address are clocked
@ -368,7 +371,7 @@ static ssize_t at24c_bwrite(FAR struct mtd_dev_s *dev, off_t startblock, size_t
fvdbg("startblock: %08lx nblocks: %d\n", (long)startblock, (int)nblocks); fvdbg("startblock: %08lx nblocks: %d\n", (long)startblock, (int)nblocks);
I2C_SETADDRESS(priv->dev, priv->addr, 7); I2C_SETADDRESS(priv->dev, priv->addr, 7);
I2C_SETFREQUENCY(priv->dev, 100000); I2C_SETFREQUENCY(priv->dev, CONFIG_AT24XX_FREQUENCY);
while (blocksleft-- > 0) while (blocksleft-- > 0)
{ {