question about UART sending on imx257

[bwq]

Hello

I am a new hand on imx257.

Now I want to make some simple UART test code on imx25 PDK startkit. What I want to do is just send out some data on UART_1. (no interrupt, no CTS, no RTS, very simple...)

The test code is as below:

	// UART Init
	UCR2_1_bit.SRST = 0; //reset
	UCR1_1_bit.UARTEN = 1;//enable UART
	UFCR_1_bit.RFDIV = 5;	// Divide input clock by 1

	UCR2_1_bit.IRTS = 1; //ignore RTS pin
	UCR2_1_bit.WS = 1; //8 bit
	UCR2_1_bit.TXEN = 1;
	UCR3_1_bit.RXDMUXSEL = 1;
	UTXD_1 = 0x000000AA;

Currently, the FIFO empty flag became 0, but I can not catch any data by oscilloscope on UART1_TXD pin. Can anybody tell me is there any setting should I do for UART sending?

[bwq]

Dear Jimmchan

I'm sorry. I'm afraid I can't read your previous message.

Regards

Ben

在 2013-07-25 17:02:41，jimmychan <admin@community.freescale.com> 写道：

|

|

|

|

question about UART sending on imx257

reply from jimmychan in i.MX Community - View the full discussion

Reply to this message by replying to this email, or go to the message on Freescale Community

Start a new discussion in i.MX Community by email or at Freescale Community

Following question about UART sending on imx257 in these streams: Inbox

|

|

[jimmychan]

How about the IOMUX setting?

[bwq]

In the reference manual, it said:

000: Select mux mode: ALT0 mux port: TXD_MUX of instance: uart1.

So I use default value (0x000) for IOMUXC_SW_MUX_CTL_PAD_UART1_TXD:MUX_MODE.

Is this correct?

在 2013-07-25 17:38:42，jimmychan <admin@community.freescale.com> 写道：

|

|

|

|

question about UART sending on imx257

reply from jimmychan in i.MX Community - View the full discussion

How about the IOMUX setting?

Reply to this message by replying to this email, or go to the message on Freescale Community

Start a new discussion in i.MX Community by email or at Freescale Community

Following question about UART sending on imx257 in these streams: Inbox

|

|

[jimmychan]

Please enable the clock for UART. Please check the Clock Gating Control Register (CGCR) in the CCM module.

[bwq]

Hi Jimmychan

The clock for UART has been already enabled in function '__arm void low_level_init (void)'.

// configure peripheral enables for CGCR0

CGCR0 = 0x1FFFFFFF;

// configure peripheral enables for CGCR1

CGCR1 = 0xFFFFFFFF;

// configure peripheral enables for CGCR2

CGCR2 = 0x000FDFFF;

Is there any other register should I set?

Regards

在 2013-07-25 16:19:38，jimmychan <admin@community.freescale.com> 写道：

|

|

|

|

question about UART sending on imx257

reply from jimmychan in i.MX Community - View the full discussion

Please enable the clock for UART. Please check the Clock Gating Control Register (CGCR) in the CCM module.

Reply to this message by replying to this email, or go to the message on Freescale Community

Start a new discussion in i.MX Community by email or at Freescale Community

Following question about UART sending on imx257 in these streams: Inbox

|

|