diff options
Diffstat (limited to 'src/stm32/stm32f0_i2c.c')
| -rw-r--r-- | src/stm32/stm32f0_i2c.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/stm32/stm32f0_i2c.c b/src/stm32/stm32f0_i2c.c index a45aa34b..b83ceb0f 100644 --- a/src/stm32/stm32f0_i2c.c +++ b/src/stm32/stm32f0_i2c.c @@ -153,6 +153,13 @@ i2c_setup(uint32_t bus, uint32_t rate, uint8_t addr) uint32_t sclh = 32; // 32 * 125ns = 4us uint32_t sdadel = 4; // 4 * 125ns = 500ns uint32_t scldel = 10; // 10 * 125ns = 1250ns + // Clamp the rate to 400Khz + if (rate >= 400000) { + scll = 10; // 10 * 125ns = 1250ns + sclh = 4; // 4 * 125 = 500ns + sdadel = 3; // 3 * 125 = 375ns + scldel = 4; // 4 * 125 = 500ns + } uint32_t pclk = get_pclock_frequency((uint32_t)i2c); uint32_t presc = DIV_ROUND_UP(pclk, nom_i2c_clock); |