CCS/AM5748: IDKAM574x uart test example - changing uart interface

Tommi Mehtonen

Part Number: AM5748

Tool/software: Code Composer Studio

I would like to change the uart interface from default 2 to 3 on idkAM574x pdk uart example. I have changed #define UART_INSTANCE (2U) to #define UART_INSTANCE (3U) , but it does not seem to work. Is there some other initialization etc. i should do.

Reason for changing the uart instance is that im using TQ's MBa57xx base board and that one routes UART3 to the serial port. Other idkAM574x examples have so far worked pretty well with this one.

Best regards

Tommi

over 5 years ago

0 Stanley Liu over 5 years ago

TI__Guru 50045 points

Hi,

Did you also update the pin mux for UART3?

Regards,

Stanley

0 Tommi Mehtonen over 5 years ago in reply to Stanley Liu

Intellectual 640 points

I did not. Is there manual/example how to change existing pinmux instead of making new one.

-Tommi

0 Tommi Mehtonen over 5 years ago in reply to Tommi Mehtonen

Intellectual 640 points

I found the files whics i shuould propably edit. Seems like UART3 is defined on the boardPadDelayInit.c at C:\ti\pdk_am57xx_1_0_17\packages\ti\board\src\idkAM574x , but the pads are not the ones i want.

The file shows now

/* UART3 - uart3_rxd on D27 - UART3 */
{0x17F8, 0x50002, {0x0, 0, 0}, {0x0, 0, 0}, {0x0, 0, 0}},

/* UART3 - uart3_txd on C28 - UART3 */
{0x17FC, 0x10001, {0x0, 0, 0}, {0x0, 0, 0}, {0x0, 0, 0}},

Is it possible just to replace these lines with

/* UART3 - uart3_rxd on A26 - UART3 */
{0x17C0, 0x50001, {0x0, 0, 0}, {0x0, 0, 0}, {0x0, 0, 0}},

/* UART3 - uart3_txd on B22 - UART3 */
{0x17C4, 0x90001, {0x0, 0, 0}, {0x0, 0, 0}, {0x0, 0, 0}},

i get from ti pinmuxtool.

-Tommi

0 Tommi Mehtonen over 5 years ago in reply to Tommi Mehtonen

Intellectual 640 points

Hi,

I now got the needed .pinmux files for the board and get the

boardPadDelay.h

boardPadDelayDevice.c

boardPadDelayInit.c and

boardPadDelayTune.h files from there.

Anyhow i havent found out where i can place these files to change the pinmuc.

-Tommi

0 Stanley Liu over 5 years ago in reply to Tommi Mehtonen

TI__Guru 50045 points

You could just modify the pin mux register directly. You don't have to call any API...

Just identify which pins are used for UART3 and modify the corresponding pin mux registers for those pins and select UART3 in muxmode.

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CCS/AM5748: IDKAM574x uart test example - changing uart interface