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Merge pull request #3026 from hierophect/stm32-i2cspeed 

STM32: Add I2C timing to the F7 and H7 board profile
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Scott Shawcroft 2020-06-15 14:50:00 -07:00 committed by GitHub
parent 9285252fbc 2aac3cbdce
commit 8ff0a3df42
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1 changed files with 25 additions and 1 deletions
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26
ports/stm/common-hal/busio/I2C.c
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@ -34,6 +34,24 @@
#include "supervisor/shared/translate.h"
#include "common-hal/microcontroller/Pin.h"
// I2C timing specs for the H7 and F7
// Configured for maximum possible clock settings for the family
#if (CPY_STM32F7)
#ifndef CPY_I2CFAST_TIMINGR
#define CPY_I2CFAST_TIMINGR 0x6000030D
#endif
#ifndef CPY_I2CSTANDARD_TIMINGR
#define CPY_I2CSTANDARD_TIMINGR 0x20404768
#endif
#elif (CPY_STM32H7)
#ifndef CPY_I2CFAST_TIMINGR
#define CPY_I2CFAST_TIMINGR 0x00B03FDB
#endif
#ifndef CPY_I2CSTANDARD_TIMINGR
#define CPY_I2CSTANDARD_TIMINGR 0x307075B1
#endif
#endif
// Arrays use 0 based numbering: I2C1 is stored at index 0
#define MAX_I2C 4
@ -120,7 +138,13 @@ void common_hal_busio_i2c_construct(busio_i2c_obj_t *self,
// Handle the HAL handle differences
#if (CPY_STM32H7 || CPY_STM32F7)
self->handle.Init.Timing = 0x40604E73; //Taken from STCube examples
if (frequency == 400000) {
self->handle.Init.Timing = CPY_I2CFAST_TIMINGR;
} else if (frequency == 100000) {
self->handle.Init.Timing = CPY_I2CSTANDARD_TIMINGR;
} else {
mp_raise_ValueError(translate("Unsupported baudrate"));
}
#else
self->handle.Init.ClockSpeed = frequency;
self->handle.Init.DutyCycle = I2C_DUTYCYCLE_2;