CCS/TMS320F28335: gpio DIRECTION FOR lcd 40X4 AS INPUT /OUTPUT

Joshi

Intellectual 630 points

Part Number: TMS320F28335
Other Parts Discussed in Thread: CONTROLSUITE

Tool/software: Code Composer Studio

Dear sir,

I am interfacing TMS320f28335 with LCD 40x4(LM40400). while gpio initialization I taken

DB0-DB7 ------>data line --------> output----------->from (GPIO0-GOIO7)

LCD_RS,LCD_WR,LCD_E1,LCD_E2-------------->control singal------------->input(GPIO10,GPIO12,GPIO13,GPIO14)

My question is : the control signals which are used can take as input or output for GPADIR.?

GpioCtrlRegs.GPAMUX1.all = 0x00000000; //
GpioCtrlRegs.GPADIR.all = 0x000000FF;//

#define LCD_WR GpioDataRegs.GPADAT.bit.GPIO10
#define LCD_RS GpioDataRegs.GPADAT.bit.GPIO11
#define LCD_E1 GpioDataRegs.GPADAT.bit.GPIO12
#define LCD_E2 GpioDataRegs.GPADAT.bit.GPIO13

over 8 years ago

0 Rajaravi Krishna Katta over 8 years ago

TI__Expert 6795 points

Hi Mahesh,

If you want LCD signals to be connected as GPIO input signals you have to configure the direction as input for GPADIR.

Hope this answers your question.

Thanks,
Katta

0 Joshi over 8 years ago in reply to Rajaravi Krishna Katta

Intellectual 630 points

I want to configured following GPIO for 40x4 LCD display.
DB0-DB7 ------>data line --------> output----------->from (GPIO0-GOIO7)

LCD_RS,LCD_WR,LCD_E1,LCD_E2-------------->control singal------------->output(GPIO10,GPIO12,GPIO13,GPIO14)

so I configurd as follows:

GpioCtrlRegs.GPAMUX1.all = 0x00000000; //
GpioCtrlRegs.GPADIR.all = 0x00003CFF;//

0 Rajaravi Krishna Katta over 8 years ago in reply to Joshi

TI__Expert 6795 points

Hi Mahesh,

It should be
GpioCtrlRegs.GPADIR.all = 0x000074FF;
as you are looking to mark GPIO10,12,13,14 as output.

Do you see any issue in the configuration. Have you checked the existing GPIO examples in controlsuite?

Thanks,
Katta

0 Joshi over 8 years ago in reply to Rajaravi Krishna Katta

Intellectual 630 points

Dear sir,

I have to configured GPIO0 to GPIO7--->o/p and GPIO10 to 13 ----> o/p .please check I have configured as follows:

GpioCtrlRegs.GPAMUX1.all = 0x00000000; //
GpioCtrlRegs.GPADIR.all = 0x00003CFF;//GPIO0 to GPIO7--->o/p and GPIO10 to 13 ----> o/p

0 Rajaravi Krishna Katta over 8 years ago in reply to Joshi

TI__Expert 6795 points

Hi Mahesh,

Ok. It is correct configuration. Do you see any issue?

Thanks,
Katta

0 Joshi over 8 years ago in reply to Rajaravi Krishna Katta

Intellectual 630 points

Dear sir,

while interfacing the TMS320f28335 with LCD 40x4 ,Is there any need of GPAPUD .please put ur valuable suggetion.

0 Rajaravi Krishna Katta over 8 years ago in reply to Joshi

TI__Expert 6795 points

Hi Mahesh,

There is no need to use GPAPUD to pull up if you are using the pins for output.

For input pins use the GPAPUD to enable the pullup.
I recommend you once go through the GPIO examples present in controlsuite.

Thanks,
Katta

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CCS/TMS320F28335: gpio DIRECTION FOR lcd 40X4 AS INPUT /OUTPUT