AM263P4-Q1: Control Card not connecting LIN1 pins to HESC (DOCK)

Hi Jeffrey,

The LIN MUX U44 is powered by the LDO2 output from the PMIC (Page 9, U7). LDO2 does not come up by default and has to be enabled via a SPI command from the AM263P4.

Can you check to see if you are enabling this LDO as part of your application?

Regards,

Brennan

Brennan,

That got me closer.

When I try to run syscfg from the command line to generate the files it complains that the UART mode needs to be 13x instead of 16x.

The GUI has no issue with me adjusting the clock tree to a /2 to get 96MHz.  That in turn allows me to set the baud rate to 1Mbps with a 16x operating mode.  Not warnings/issues reported from the gui tool.

It is not until we run syscfg to generate the files from the command line that it fails.  

We are not building inside CodeComposer.  We have a working CMAKE environment for the project.

Brennan,

For completeness.  I loaded one of the example application from the SDK 11.00.19.  I added UART1.  Adjsuted the clock tree as noted above.  Set the baud rate as noted.  This is all done inside CCS.  CCS reported the same error.  It is expecting the mode to be set to 13x.

It would appear that the rules engine is not accounting for the clock tree configuration.

Jeff

Jeffrey, 

To be clear, you added an example application from the SDK v11.00.19, added UART1, and adjusted the clock tree to 16x/baud rate 1Mbps?

Which version of CCS are you using? I will attempt to replicate this issue on my end.

Regards,

Brennan

Brennan,

I am using CCS Version: 20.3.1.5__1.9.1 

SDK 11.00.00.19, 

Syscfg included with CCS 1.25, I also use Syscfg 1.26 external to CCS

Jeff

Jeff,

Thanks, can you also try using CCS 12.8.1? 

Regards,

Brennan

Brennan,

I will grab CCS 12.8.1 for Linux and install in the morning.

Jeff

Brennan,

I installed CCS12.8.1 for Linux.

I  imported the uart echo example from the SDK 11.00.19,.  CCS is configured so that it will use Syscfg 1.26.

I added a second UART UART2.  In the Clock tree view I changed UART2_CLK_GCM_CLKDIV to 2.  This results in the UART2_INT_CLK being 96MHz.  Back to configure the UART I set the baud rate to 1000000.  No other changes were made.

I Get the follow error when attempting to compile:

uilding file: "../example.syscfg"
Invoking: SysConfig
"/opt/ti/sysconfig_1.26.0/sysconfig_cli.sh" --script "/home/jhanzlik/workspace_v12/uart_echo_am263px-cc_r5fss0-0_freertos_ti-arm-clang/example.syscfg" -o "syscfg" -s "/opt/ti/mcu_plus_sdk_am263px_11_00_00_19/.metadata/product.json" --context "r5fss0-0" --part AM263P4 --package ZCZ_S --compiler ticlang
Running script...
Validating...
info: CONFIG_UART_CONSOLE(/drivers/uart/uart) baudRate: Actual Baudrate Possible: 115385 (0 % error)
info: CONFIG_MPU_REGION3(/kernel/dpl/mpu_armv7) attributes: Some memory region(s) within this range is Shared among cores. 
subdir_rules.mk:7: recipe for target 'build-391003745' failed
error: CONFIG_UART0(/drivers/uart/uart) operMode: Operating mode should be 13X for the configured baudrate at this clock
1 error(s), 0 warning(s)
gmake: *** [build-391003745] Error 1
gmake: Target 'all' not remade because of errors.

**** Build Finished ****

Hi Jeff,

I tried this on my side and observe the same failure. Some key things to note:

• Per the AM263P4 Technical Reference Manual (section 13.1.4.2.1.3), UART can only operate in the following modes:
  1. UART 16x with baud rate <=230.4kbps
  2. UART 16× with autobauding (>= 1200 bps and <= 115.2 kbps)
  3. UART 13x with baud rate >=460.8kbps

Therefore, your combination of UART 16x with baud rate of 1Mbps violates the operating mode limits of the UART on this device. If you want a 1Mbps baud, then the UART mode must be 13x.

Next, according to section 13.1.4.4.8.1.2 in the TRM, the formulas to calculate the UART clock divider values are:

• UART 16× mode: Divisor value = Operating frequency / (16× baud rate)
• UART 13× mode: Divisor value = Operating frequency / (13× baud rate)

For your case of divider=2 and operating frequency=96MHz, the baud rate calculates to 3692307baud.

If I input this value for the Baudrate in SysConfig, the project successfully builds.

Please try adjusting your UART parameter settings according to these guidelines.

Regards,

Brennan

Brennan,

Thank you the clarification.  The previous project used an AM2632-Q1.  The tools did not flag this configuration as an error.  

The setting of 1Mbps for the baud rate is importatnt.  We are connecting to a BQ79731.  It supports 1Mbps +/- 1%. 

With that said, when I try to set it to 1Mbps syscfg gui accepts the setting.  I get the this error:

error: CONFIG_UART0(/drivers/uart/uart) baudRate: Actual baudrate error over tolerance limit (923077, 8 % error), try a

I also tried setting to 1050000 for baud I get a similar error.  I can play wack-a-mole to guess.  I am looking for settings that will get me close to the 1Mbps rate required.

Jeff

Brennan,

There appears to be conflicting information for configuring the UART baud rate.  In one section of the document it claims above ~230kbps we must use 13x mode.  However in the following table 
3.6884 Mbps 13x 1 0x00, 0x01 3.6923 Mbps +0.16

Table 13-92. UART Baud Rate Settings (160-MHz Clock)
Baud Rate Baud Multiple DLH, DLL (Decimal) DLH, DLL (Hex) Actual Baud Rate Error (%)
2 Mbps 16x 5 0x00, 0x05 2 Mbps 0
5 Mbps 16x 2 0x00, 0x02 5 Mbps 0
10 Mbps 16x 1 0x00, 0x01 10 Mbps 0

Using the settings for 2Mbps 160MHz clock, 16X mode, It does not work.  Can you verify this?  

It appears that the tool is forcing 13x assuming the clock is 48MHz.  That is the default and valid.  I am still trying to understand how the AM2632 using the same exact UART module as the AM263P4 works perfectly and was easy to configure.  It appears to me that the addition of the clock tree configuration as a separate activity is not well intergrated.

Jeff

Jeff,

Looping in the SW engineer responsible for the UART module. Do you know which version of the SDK/CCS/SysConfig you were previously using when the clock/baud rate settings worked for AM2632?

Regards,

Brennan

Brennan,

For the AM2632 we were using SDK 10.02.00.13, Syscfg 1.24.1.

Jeff

Hi Jeffrey,

Can we try this configuration to attain 1Mbps baudrate?

Is this the configuration that you wanted us to check for 2Mbps?
Regards,

Aswin

Also please see the config for 160MHz clock.

Aswin,

I am attaching screen shots for both cfgs.  The summary they both fail to compile.  The 96MHz fails with an error stating that the maximum baud rate is 923077.  The 160Mhz fails stating that 13x mode is required.

Jeff

Hi Jeff,

I am unable to access the file that you shared.

Can you please check it again.

Regards,

Aswin

Aswin,

This is the cfg for 96MHz

Jeff

Aswin,

This is the 96MHz error.

Jeff

Aswin,

What is the magic to adding a local file to the post?

Jeff

Aswin,

I think I figured it out.

am263p4_uart1_.zip

Jeff

Aswin,

In case you cannot extract the zip here is the error for the 96MHz cfg. The 160Mhz

Jeff

Hi Jeff,

Thank you for sharing the configs. I was able to reproduce the issue. I am now checking this with the team. I will let you know of the reason behind this as soon as possible.

Regards,

Aswin