Harald Welte | c3f170d | 2019-02-24 09:06:59 +0100 | [diff] [blame] | 1 | #include "atmel_start_pins.h" |
| 2 | #include "i2c_bitbang.h" |
| 3 | |
| 4 | /* FIXME: This somehow ends up with measured 125 kHz SCL speed ?!? We should probably |
| 5 | * switch away from using delay_us() and instead use some hardware timer? */ |
| 6 | #define I2C_DELAY_US 1 |
| 7 | |
| 8 | #ifndef SDA1 |
| 9 | /* We should define those pins in Atmel START. Until they are, define them here */ |
| 10 | #define SDA1 GPIO(GPIO_PORTB, 15) |
| 11 | #define SCL1 GPIO(GPIO_PORTB, 14) |
| 12 | #define SDA2 GPIO(GPIO_PORTB, 3) |
| 13 | #define SCL2 GPIO(GPIO_PORTB, 2) |
| 14 | #define SDA3 GPIO(GPIO_PORTB, 7) |
| 15 | #define SCL3 GPIO(GPIO_PORTB, 6) |
| 16 | #define SDA4 GPIO(GPIO_PORTC, 28) |
| 17 | #define SCL4 GPIO(GPIO_PORTC, 27) |
| 18 | #endif |
| 19 | |
| 20 | /* Unfortunately the schematics count I2C busses from '1', not from '0' :( |
| 21 | * In software, we [obviously] count from '0' upwards. */ |
| 22 | const struct i2c_adapter i2c[4] = { |
| 23 | [0] = { |
| 24 | .pin_sda = SDA1, |
| 25 | .pin_scl = SCL1, |
| 26 | .udelay = I2C_DELAY_US, |
| 27 | }, |
| 28 | [1] = { |
| 29 | .pin_sda = SDA2, |
| 30 | .pin_scl = SCL2, |
| 31 | .udelay = I2C_DELAY_US, |
| 32 | }, |
| 33 | [2] = { |
| 34 | .pin_sda = SDA3, |
| 35 | .pin_scl = SCL3, |
| 36 | .udelay = I2C_DELAY_US, |
| 37 | }, |
| 38 | [3] = { |
| 39 | .pin_sda = SDA4, |
| 40 | .pin_scl = SCL4, |
| 41 | .udelay = I2C_DELAY_US, |
| 42 | } |
| 43 | }; |