F4_HAL/i2c: Fix I2C frequency calculation macros.

So that the computed value is not faster than requested one. This fix is backported from the F4 HAL v1.27.1.
micropython · Sep 23, 2022 · f71b52e · f71b52e
1 parent 5ac9b69
commit f71b52e
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_i2c.h b/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_i2c.h
@@ -576,10 +576,11 @@ uint32_t HAL_I2C_GetError(I2C_HandleTypeDef *hi2c);
   * @{
   */
 
+#define I2C_CCR_CALCULATION(__PCLK__, __SPEED__, __COEFF__)     (((((__PCLK__) - 1U)/((__SPEED__) * (__COEFF__))) + 1U) & I2C_CCR_CCR)
 #define I2C_FREQRANGE(__PCLK__)                            ((__PCLK__)/1000000U)
 #define I2C_RISE_TIME(__FREQRANGE__, __SPEED__)            (((__SPEED__) <= 100000U) ? ((__FREQRANGE__) + 1U) : ((((__FREQRANGE__) * 300U) / 1000U) + 1U))
-#define I2C_SPEED_STANDARD(__PCLK__, __SPEED__)            (((((__PCLK__)/((__SPEED__) << 1U)) & I2C_CCR_CCR) < 4U)? 4U:((__PCLK__) / ((__SPEED__) << 1U)))
-#define I2C_SPEED_FAST(__PCLK__, __SPEED__, __DUTYCYCLE__) (((__DUTYCYCLE__) == I2C_DUTYCYCLE_2)? ((__PCLK__) / ((__SPEED__) * 3U)) : (((__PCLK__) / ((__SPEED__) * 25U)) | I2C_DUTYCYCLE_16_9))
+#define I2C_SPEED_STANDARD(__PCLK__, __SPEED__)            ((I2C_CCR_CALCULATION((__PCLK__), (__SPEED__), 2U) < 4U)? 4U:I2C_CCR_CALCULATION((__PCLK__), (__SPEED__), 2U))
+#define I2C_SPEED_FAST(__PCLK__, __SPEED__, __DUTYCYCLE__) (((__DUTYCYCLE__) == I2C_DUTYCYCLE_2)? I2C_CCR_CALCULATION((__PCLK__), (__SPEED__), 3U) : (I2C_CCR_CALCULATION((__PCLK__), (__SPEED__), 25U) | I2C_DUTYCYCLE_16_9))
 #define I2C_SPEED(__PCLK__, __SPEED__, __DUTYCYCLE__)      (((__SPEED__) <= 100000U)? (I2C_SPEED_STANDARD((__PCLK__), (__SPEED__))) : \
                                                                   ((I2C_SPEED_FAST((__PCLK__), (__SPEED__), (__DUTYCYCLE__)) & I2C_CCR_CCR) == 0U)? 1U : \
                                                                   ((I2C_SPEED_FAST((__PCLK__), (__SPEED__), (__DUTYCYCLE__))) | I2C_CCR_FS))