cpu/stm32f4: add i2c low speed mode support

2016-12-08 12:38:12 +01:00 · 2016-12-08 12:38:12 +01:00 · 3ec401da61
commit 3ec401da61
parent 742387acc0
1 changed files with 6 additions and 0 deletions
--- a/cpu/stm32f4/periph/i2c.c
+++ b/cpu/stm32f4/periph/i2c.c
@ -73,7 +73,13 @@ int i2c_init_master(i2c_t dev, i2c_speed_t speed)

    /* read speed configuration */
    switch (speed) {
+        case I2C_SPEED_LOW:
+            /* 10Kbit/s */
+            ccr = I2C_APBCLK / 20000;
+            break;
+
        case I2C_SPEED_NORMAL:
+            /* 100Kbit/s */
            ccr = I2C_APBCLK / 200000;
            break;