On 03:36 Sat 24 May , Sergey Lapin wrote:
> Hi, all!
>
> I use the following patch on my AT91SAM9260-based custom board to
> configure bit-banged I2C:
>
> diff --git a/board/atmel/at91sam9260ek/at91sam9260ek.c
> b/board/atmel/at91sam9260ek/at91sam9260ek.c
> index b30aad8..99fc2bd 100644
> --- a/board/atmel/at91sam9260ek/at91sam9260ek.c
> +++ b/board/atmel/at91sam9260ek/at91sam9260ek.c
> @ -234,3 +234,46 @@ void reset_phy(void)
> #endif
> }
> #endif
Why don't you use the gpio function?
> +
void at91sam9260_i2c_init(void)
{
at91_set_GPIO_periph(AT91_PIN_PA23, 0);
at91_set_multi_drive(AT91_PIN_PA23, 1);
at91_set_A_periph(AT91_PIN_PA24, 0);
at91_set_multi_drive(AT91_PIN_PA24, 1);
}
void at91sam9260_i2c_scl(unsigned long bit)
{
at91_set_gpio_value(AT91_PIN_PA24, bit);
}
void at91sam9260_i2c_sda(unsigned long bit)
{
at91_set_gpio_value(AT91_PIN_PA23, bit)
}
int at91sam9260_i2c_read(void)
{
retrun at91_get_gpio_value(AT91_PIN_PA23);
}
void at91sam9260_i2c_active()
{
gpio_direction_output(AT91_PIN_PA23, 0);
}
void at91sam9260_i2c_tristate()
{
gpio_direction_input(AT91_PIN_PA23);
}
> diff --git a/include/configs/at91sam9260ek.h b/include/configs/at91sam9260ek.h
> index fd9932f..5e66c9e 100644
> --- a/include/configs/at91sam9260ek.h
> +++ b/include/configs/at91sam9260ek.h
> @@ -85,6 +85,8 @@
>
> #define CONFIG_CMD_NAND 1
> #define CONFIG_CMD_USB 1
> +#define CONFIG_CMD_I2C 1
> +#define CONFIG_I2C_CMD_TREE 1
>
> /* SDRAM */
> #define CONFIG_NR_DRAM_BANKS 1
> @ -192,4 +194,20 @@
> #error CONFIG_USE_IRQ not supported
> #endif
>
> +/*
> + * Software (bit-bang) I2C driver configuration
> + */
> +#define CONFIG_SOFT_I2C 1
> +#define CFG_I2C_SPEED 1000000
> +#define I2C_INIT at91sam9260_i2c_init()
#define I2C_ACTIVE at91sam9260_i2c_active()
#define I2C_TRISTATE at91sam9260_i2c_tristate()
> +#define I2C_SCL(bit) at91sam9260_i2c_scl(bit)
> +#define I2C_SDA(bit) at91sam9260_i2c_sda(bit)
> +#define I2C_DELAY udelay(2)
> +#define I2C_READ at91sam9260_i2c_read()
> +#define CFG_I2C_SLAVE 0
> +#define DEBUG_I2C
> #endif
> +
I sync it will be better to use the hardware stack which is not too
complicate to implement
Best Regards,
J.
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