TMDSIDK437X: How to control GPIO at register level

U-SK,

The functional CSL layer provides users a way to set/clear or send dataout on the GPIO pins using register level write. The C callable functions for GPIO for AM437x are defined in file :pdk_am437x_1_0_10\packages\ti\csl\src\ip\gpio\V1\priv\gpio_v2.c

Use the API GPIOPinWrite to write a value to the pin. The function is defined as follows:

void GPIOPinWrite(uint32_t baseAdd,
                  uint32_t pinNumber,
                  uint32_t pinValue)
{
    if (GPIO_PIN_HIGH == pinValue)
    {
        HW_WR_REG32(baseAdd + GPIO_SETDATAOUT, (uint32_t) 1 << pinNumber);
    }
    else
    {
        HW_WR_REG32(baseAdd + GPIO_CLEARDATAOUT, (uint32_t) 1 << pinNumber);
    }
}

You can use these APIs from RTOS application or from bare-metal applications. If you are simply benchmarking, you can use the GPIO LLD example to do basic pinmux and GPIO initialization and then use this API instead of  GPIO_write/GPIO_toggle to reduce driver latency.

Regards,

Rahul  

To use CSL APIs in the source you need to include the header file csl_gpio.h from pdk_am437x_1_0_10\packages\ti\csl\ and have -D SOC_AM437x in the compiler settings as described here:

http://software-dl.ti.com/processor-sdk-rtos/esd/docs/latest/rtos/index_device_drv.html 

Detail documentation for GPIO CSL APIs is int he document pdk_am437x_1_0_xx\packages\API_Documentation.html as shown below: