Hello community,
the RTOS BSP comes with a lot of example code. Even examples without freeRTOS are included.
This is really helpful, thumbs up!
Most examples call a "hardware_init()" function that is usually located in an additional hardware_init.c file.
This function sets up clocks and peripherals. I have a question on the peripheral pin mux setup:
From an I2C example in the BSP:
void configure_i2c_pins(I2C_Type* base){
switch((uint32_t)base)
{
case I2C1_BASE:
// I2C1 iomux configuration
IOMUXC_SW_MUX_CTL_PAD_I2C2_SCL =
IOMUXC_SW_MUX_CTL_PAD_I2C2_SCL_MUX_MODE(0) |
IOMUXC_SW_MUX_CTL_PAD_I2C2_SCL_SION_MASK;
IOMUXC_SW_MUX_CTL_PAD_I2C2_SDA =
IOMUXC_SW_MUX_CTL_PAD_I2C2_SDA_MUX_MODE(0) |
IOMUXC_SW_MUX_CTL_PAD_I2C2_SDA_SION_MASK;
IOMUXC_I2C2_SCL_SELECT_INPUT = IOMUXC_I2C2_SCL_SELECT_INPUT_DAISY(1);
IOMUXC_I2C2_SDA_SELECT_INPUT = IOMUXC_I2C2_SDA_SELECT_INPUT_DAISY(1);
IOMUXC_SW_PAD_CTL_PAD_I2C2_SCL = IOMUXC_SW_PAD_CTL_PAD_I2C2_SCL_PE_MASK |
IOMUXC_SW_PAD_CTL_PAD_I2C2_SCL_PS(3) |
IOMUXC_SW_PAD_CTL_PAD_I2C2_SCL_DSE(0) |
IOMUXC_SW_PAD_CTL_PAD_I2C2_SCL_HYS_MASK;
IOMUXC_SW_PAD_CTL_PAD_I2C2_SDA =
IOMUXC_SW_PAD_CTL_PAD_I2C2_SDA_PE_MASK |
IOMUXC_SW_PAD_CTL_PAD_I2C2_SDA_PS(3) |
IOMUXC_SW_PAD_CTL_PAD_I2C2_SDA_DSE(0) |
IOMUXC_SW_PAD_CTL_PAD_I2C2_SDA_HYS_MASK;
break;
[...]
The Pins tool output looks very different from the example above:
/* Input Select (DAISY) Field: Selecting Pad: UART2_RX_DATA Mode: ALT1 for I2C2_SCL */
HW_IOMUXC_I2C2_SCL_SELECT_INPUT_WR(
IOMUXC_BASE,
BF_IOMUXC_I2C2_SCL_SELECT_INPUT_DAISY(
BV_IOMUXC_I2C2_SCL_SELECT_INPUT_DAISY_UART2_RX_DATA_ALT1));
/* Input Select (DAISY) Field: Selecting Pad: UART2_TX_DATA Mode: ALT1 for I2C2_SDA */
HW_IOMUXC_I2C2_SDA_SELECT_INPUT_WR(
IOMUXC_BASE,
BF_IOMUXC_I2C2_SDA_SELECT_INPUT_DAISY(
BV_IOMUXC_I2C2_SDA_SELECT_INPUT_DAISY_UART2_TX_DATA_ALT1));
So it seems like the file generated by Pins is only setting up the SELECT_INPUT parts.
What happens with the additional settings (containing ...PAD_CTL_PAD...)?
May I simply replace
IOMUXC_I2C2_SCL_SELECT_INPUT = IOMUXC_I2C2_SCL_SELECT_INPUT_DAISY(1);
with
IOMUXC_I2C2_SCL_SELECT_INPUT = IOMUXC_I2C2_SCL_SELECT_INPUT_DAISY(0);
in the example to adjust the pin mux to UART2 pins?
