How to configure portE of LPC43xx for i/p or o/p for GPIO

[sauravsinha]

Hi, 

I am using LPC4367JBD208 controller for my application. For one of my requirement i have interfaced portE to one of my peripheral (3x8 Keypad). So for this i need to configure few portpins as input and few as output. I know through DIR register we can configure portpins as input or output BUT it can configure only upto port8. What about PORTA to PORTF. 

Kindly guide me with this how to achieve this.

[soledad]

Hi,

1.- Please check carefully the pin descriptions

P0_0 corresponds to GPIO0[0]

P0_1 -> GPIO0[1]

…

PA_1 -> GPIO4[8]

PA_2 -> GPIO4[9]

…

PB_6 -> GPIO5[26]

…

PF_2 -> GPIO7[17]

PF_11 -> GPIO7[25]

 

According with the user manual page 471,  “Each GPIO port n (n = 0 to 7) has one direction register for configuring the port pins as inputs or outputs.”

 

2.- Please check the user manual pages 425-429, you will find information about how to select analog/digital functions.

In the following codes, it illustrate how to toggle the P2_10.

    Chip_SCU_PinMuxSet(0x2, 10, (SCU_MODE_FUNC5)) // P2.10: GPIO0[14]
    Chip_GPIO_SetPinDIROutput(LPC_GPIO_PORT,0, 14); //Set pin direction
    Chip_GPIO_SetPinState(LPC_GPIO_PORT, 0, 14, false); // Output low
    Chip_GPIO_SetPinState(LPC_GPIO_PORT, 0, 14, true); // Output high

Have a great day,
Sol

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