diff options
Diffstat (limited to 'src/stm32/stm32f0_i2c.c')
| -rw-r--r-- | src/stm32/stm32f0_i2c.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/src/stm32/stm32f0_i2c.c b/src/stm32/stm32f0_i2c.c index ef12145f..9f4bbcc6 100644 --- a/src/stm32/stm32f0_i2c.c +++ b/src/stm32/stm32f0_i2c.c @@ -149,17 +149,17 @@ i2c_setup(uint32_t bus, uint32_t rate, uint8_t addr) gpio_peripheral(ii->sda_pin, ii->function | GPIO_OPEN_DRAIN, 1); // Set 100Khz frequency and enable - uint32_t nom_i2c_clock = 8000000; // 8mhz internal clock = 125ns ticks - uint32_t scll = 40; // 40 * 125ns = 5us - uint32_t sclh = 32; // 32 * 125ns = 4us - uint32_t sdadel = 4; // 4 * 125ns = 500ns - uint32_t scldel = 10; // 10 * 125ns = 1250ns + uint32_t nom_i2c_clock = 12000000; // 12mhz internal clock (83.3ns tick) + uint32_t scll = 60; // 60 * 83.3ns = 5us + uint32_t sclh = 48; // 48 * 83.3ns = 4us + uint32_t sdadel = 6; // 6 * 83.3ns = 500ns + uint32_t scldel = 15; // 15 * 83.3ns = 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 + scll = 15; // 15 * 83.3ns = 1250ns + sclh = 6; // 6 * 83.3 = 500ns + sdadel = 4; // 4 * 83.3 = 333ns + scldel = 6; // 6 * 83.3 = 500ns } uint32_t pclk = get_pclock_frequency((uint32_t)i2c); |