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stm32: Use 12Mhz nominal internal clock in stm32f0_i2c.c

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Increase the internal nominal clock from 8Mhz to 12Mhz - this improves
support for higher chip frequencies.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2025-04-28 20:05:59 -04:00
parent 3cf8899a5a
commit 7b697105b3
1 changed files with 9 additions and 9 deletions
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18
src/stm32/stm32f0_i2c.c
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@ -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);