When power is applied to the STM32L476, 3.3 v is also applied to the LSM303AH pins
2 CS
9 Vdd
10 Vdd IO
These commands work:
MX_I2C3_Init(); Goes to code created by CubeMX
HAL_I2C_GetState(&hi2c3); it is ready
HAL_I2C_Init(&hi2c3);
I get timeout error (32) with the following commands. What did I do wrong?
HAL_I2C_Mem_Reads All time out
HAL_I2C_Mem_Writes All time out
HAL_I2C_Master_Receives All time out
HAL_I2C_Master_Transmits All time out
Examples:
HAL_I2C_Mem_Read(&hi2c3,0x1D, CTRL_REG1_A, 1, &Data_In, 1, 100)
HAL_I2C_Mem_Write(&hi2c3, 0x1D, CTRL_REG2_A, 1, &Data_Out, 1, 100);
HAL_I2C_Master_Transmit(&hi2c3, CTRL_REG2_A, &Data_Out, 1, 100);
HAL_I2C_Master_Receive(&hi2c3, WHO_AM_I_A, &WAI_A, 1, 100);
This is the I2C3 code created by CubeMX:
hi2c3.Instance = I2C3;
hi2c3.Init.Timing = 0x10909CEC;
hi2c3.Init.OwnAddress1 = 58;
hi2c3.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
hi2c3.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
hi2c3.Init.OwnAddress2 = 0;
hi2c3.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
hi2c3.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
hi2c3.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
if (HAL_I2C_Init(&hi2c3) != HAL_OK)
Here is the CubeMX settings:
Timing
Custom timing Enabled
I2C Speed Mode Standard Mode
I2C Speed Frequency KHz 100
Analog Filter Enabled
Timing 0x10909CDC Determined by CubeMX
Slave Features
Clock No Stretch Mode Disabled
General Call Address Detection disabled
Primary Address Length Selection 7 bit
Dual Address Acknowledged Disabled
Primary slave Address 0x1D
Clock Configuration: no external chip used
LSI RC 32 HCLK MHZ 80
HIS RC 16
What is wrong with this setup and what is the first HAL command that should be made?
