400KHz i2c with slight rise/fall slew

32blit-stm32/Src/i2c.c

diff --git a/32blit-stm32/Src/i2c.c b/32blit-stm32/Src/i2c.c
index 0a955a8..459b82e 100644
--- a/32blit-stm32/Src/i2c.c
+++ b/32blit-stm32/Src/i2c.c
@@ -31,7 +31,7 @@
 {

 

   hi2c4.Instance = I2C4;

-  hi2c4.Init.Timing = 0x307075B1;

+  hi2c4.Init.Timing = 0x20401943;

   hi2c4.Init.OwnAddress1 = 0;

   hi2c4.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;

   hi2c4.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;