Hi Heiko,
On 03/20/2015 06:10 PM, Heiko Schocher wrote:
Hello Bo,
Am 20.03.2015 10:44, schrieb Bo Shen:
Hi Heiko,
After check the software i2c code, I found it can not support multi
instances, although it has I2C_SOFT_DECLARATIONS2,
I2C_SOFT_DECLARATIONS3, I2C_SOFT_DECLARATIONS4.
Because, when do GPIO operation, there is only one pair of
CONFIG_SOFT_I2C_GPIO_SCL and CONFIG_SOFT_I2C_GPIO_SDA.
So, if want to support multi instances, it needs to extend the GPIO
configuration for SCL/SDA, am I right?
Prefered way should be to use DM, Przemyslaw posted patches
for the soft-i2c driver, see
http://lists.denx.de/pipermail/u-boot/2015-March/207641.html
maybe you can try this?
Thanks for your information.
As I try to use the old version of U-Boot, it doesn't support DM well.
If not, you are right, you must define your own
I2C_SCL/I2C_SDA/I2C_READ/I2C_INIT
defines, for example:
# define I2C_SCL(bit) \
do { \
switch(I2C_ADAP_HWNR) {
case 0:
gpio_direction_output(CONFIG_SOFT_I2C_GPIO_SCL_0, bit); \
break;
case 1:
gpio_direction_output(CONFIG_SOFT_I2C_GPIO_SCL_1, bit); \
break;
[...]
I2C_GPIO_SYNC; \
} while (0)
For this, the I2C_SCL and I2C_SDA working, however for I2C_READ, it
maybe need to modify the definition from micro to function, as the
I2C_READ can not use do {} while.
Thanks again.
bye,
Heiko
Best Regards,
Bo Shen
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