topic Re: QSCI baud rate setting in CodeWarrior Development Tools

QSCI baudrate setting

Ujwala_kontham — Fri, 01 Mar 2024 06:56:56 GMT

Iam using Serial LDD component in Code worrier 11.1 and setting the baud rate of 115200 in the configuration but in actual generated code it is setting the baud rate as 57600 i.e., 1 index less in baud rate table, this is same for all baud rate, can I get a solution for this to set it as required.

Re: QSCI baudrate setting

_Leo_ — Fri, 01 Mar 2024 15:48:46 GMT

Hi,

Thank you so much for your interest in our products and for using our community.

Can you tell us which device are you using please?

Re: QSCI baudrate setting

Ujwala_kontham — Mon, 04 Mar 2024 04:20:08 GMT

Iam using MC56F82746 VLF controller

Re: QSCI baudrate setting

xiangjun_rong — Mon, 04 Mar 2024 09:09:23 GMT

Hi,

As you know that the SCI0 driving clock can be BUS_CLK or 2xBUS_CLK.

Pls check if you use BUS_CLK or 2xBUS_CLK by checking the SIM_PCR register.

This is from the RM of MC56F827xx.

Hope it can help you

XiangJun Rong

Re: QSCI baud rate setting

Ujwala_kontham — Mon, 04 Mar 2024 09:19:01 GMT

yes in both the cases it is setting that same .

that means if we configure it for 115200 it setting baud rate of 57600

and if we configure it for 230400 it setting baud rate of 115200

Re: QSCI baud rate setting

xiangjun_rong — Tue, 05 Mar 2024 02:46:03 GMT

Hi,

Okay, it appears that it is a bug of Processor Expert, in the debug, pls read the QSCIx_RATE register, and tell us the BUS_CLK clock frequency you are using, then compute the baud rate of SCI based on the BUS_CLK or 2XBUS_CLK.

If baud rate does not match with the expected, it is a bug of PE.

Hope it can help you

BR'

XiangJun Rong

Re: QSCI baud rate setting

Ujwala_kontham — Tue, 05 Mar 2024 04:33:47 GMT

Iam using 30MHz of bus clock frequency and operating CPU in fast mode which intern sets core clock frequency and system clock frequency as 60MHz, and we debugged using both BUS_Clk and 2XBUS_Clck and got below values of QSCIx_RATE and QSCIx_CTRL3 registers respectively.
using BUS_CLk - 0104(RATE), 0000(CTRL3)
using 2XBUS_Clk - 0209(RATE), 0000(CTRL3)
and we also found that TimerInt_LDD component we are getting interrupt at double the time set in configuration that means if we configure it as 100us getting interrupt at 200us.

Re: QSCI baud rate setting

xiangjun_rong — Tue, 05 Mar 2024 07:21:40 GMT

Hi,

If the BUS_CLK clock frequency is 30MHz, the baud rate will be:

case1:

using BUS_CLk - 0104(RATE), baud rate=BUS_CLK/(16 *SBR)=30MHz(16*32.5)=57.7KHz instead of 115.2KHz

using 2XBUS_Clk - 0209(RATE),baud rate=2XBUS_CLK/(16 *SBR)=60MHz(16*65)=57.7KHz instead of 115.2KHz

Obviously, the code generated by PE has issue. Now and in the coming days, only SDK will be supported.

Sorry for the incorrect code.

XiangJun Rong

Re: QSCI baud rate setting

Ujwala_kontham — Tue, 05 Mar 2024 09:13:10 GMT

can i get SDK for my controller (MC56F82746)?

Re: QSCI baud rate setting

xiangjun_rong — Wed, 06 Mar 2024 02:41:59 GMT

Hi,

As you know that MC56F82746 does not have tower board, so you have to select Processor as the following fig:

Hope it can help you

XiangJun Rong

Re: QSCI baud rate setting

Ujwala_kontham — Wed, 06 Mar 2024 05:12:28 GMT

even after downloadind SDK of 2746 getting the project of 2748