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.