topic Re: RT1020 SEMC DBI in i.MX RT Crossover MCUs

RT1020 SEMC DBI

CCandido — Sat, 09 Mar 2019 13:28:15 GMT

Hi,

I'm using RT1020-EVK as initial tests, now I'm drawing a custom board.
to use LCD, I want to test the LCD driver function,

want to do a simple test now, before making the board.

Info:

RT1021DAG5

SSD1963 - 16bits parallel, 32K x 16bits.

help this registers SEMC DBI (DMA memory-to-memory)

semc_dbi_config_t

sem_dbi_burst_len_t

semc_dbi_column_bit_num_t

thanks,

Carlos.

Re: RT1020 SEMC DBI

jeremyzhou — Tue, 12 Mar 2019 03:04:29 GMT

Hi Carlos Candido,

Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
Actually, I'm not clear with your question, whether you can clarify it.

Have a great day,
TIC

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Re: RT1020 SEMC DBI

CCandido — Tue, 12 Mar 2019 13:13:29 GMT

Hi Jeremyzhou,

The current SDK does not have DBI initialization, need to test SEMC DBI function ok.

my test not run.

#define DBI_BASE *((volatile uint16_t *)0x80000000U) // to SSD1963 16bits bus

init_sram(); //init sdram, io SEMC ok

PRINTF("\r\n SEMC DBI\r\n");
if (init_dbi( ) != kStatus_Success) // my test
{
PRINTF("\r\n SEMC DBI Init Failed\r\n");
}

test value bus dbi pins:

while(1){

*((volatile uint16_t *)&DBI_BASE ) = lc++;

delay_1_segunds;

}

//----------------------------------------------------------

status_t init_dbi( void){
semc_dbi_config_t dbi_config;
uint32_t clockFrq = EXAMPLE_SEMC_CLK_FREQ;
memset(&dbi_config, 0, sizeof(semc_dbi_config_t));

SEMC_GetDefaultConfig(&dbi_config);
SEMC_Init(SEMC, &dbi_config);

dbi_config.csxPinMux = kSEMC_MUXCSX1; // I do not know which pin to cs DBI
dbi_config.address = 0x80000000;
dbi_config.memsize_kbytes = (64U * 1024U);
dbi_config.columnAddrBitNum = kSEMC_Dbi_Colum_12bit;
dbi_config.portSize = kSEMC_PortSize16Bit;
dbi_config.tCsxHold_Ns = 20;
dbi_config.tCsxInterval_Ns = 20;
dbi_config.tCsxSetup_Ns = 20;
dbi_config.tRdxHigh_Ns = 20;
dbi_config.tRdxLow_Ns = 20;
dbi_config.tRdxLow_Ns = 20;
dbi_config.tWexLow_Ns = 20;
return SEMC_ConfigureDBI(SEMC, &dbi_config, clockFrq);
}
//-------------------------------------------------------

now I just want to test the bus, and then make a custom board, RT1021.

thanks,

Carlos.

Re: RT1020 SEMC DBI

jeremyzhou — Wed, 13 Mar 2019 06:42:52 GMT

Hi Carlos Candido,

Thanks for your reply.
1. The MUX_CSX1 pin can be used as the DBI CSX pin.

2. According to your description, the init_dbi() doesn't work successful, it may be related to the hardware circuit, you'd better check it.
3. In further, you can use the logic analyzer or oscilloscope to visualize the wave of the SEMC pins during executing the init_dbi(), it'll make you find the issue out easily.

Have a great day,
TIC

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Re: RT1020 SEMC DBI

CCandido — Fri, 15 Mar 2019 14:13:18 GMT

Hi Jeremyzhou,

test with DBI, I was not successful :smileylaugh:

see my code: semc_dbi.zip

running test

if (init_dbi( ) != kStatus_Success){

while(1){
PRINTF("SEMC Init_dbi Failed\r\n"); <--- here ever
vTaskDelay(1000);
}

my case use 16bits data, CSx, WR, to bus LCD SSD1963.

I need to solve this before I make the new board,

thanks,

Carlos.

Re: RT1020 SEMC DBI

jeremyzhou — Mon, 18 Mar 2019 03:29:18 GMT

Hi Carlos Candido,,
Thanks for your reply.
As mentioned before, the issue may be related to the hardware circuit, so whether you can upload the schematic about the SSD1963 connection.
In further, whether you had already used the logic analyzer or oscilloscope for testing, if yes, please share the testing result.

Have a great day,
TIC

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Re: RT1020 SEMC DBI

CCandido — Fri, 29 Mar 2019 19:41:41 GMT

Hi,

new test

init_dbi( ) = kStatus_Success

PIN WR, not pulsed, see wtth logic Analizer

mode SDRAM ok, WR Pulse ok,

see code source, to help

thanks,

Carlos.

Re: RT1020 SEMC DBI

jeremyzhou — Thu, 04 Apr 2019 09:48:46 GMT

Hi Carlos Candido,

Sorry for reply late, as I thought that your issue is resolved.
Back to your reply, how it going on.
Whether the return value of init_dbi( ) is still not the kStatus_Success.
In the previous reply, I suspect that the issue may be related to the hardware circuit, so whether you can upload the schematic about the SSD1963 connection.
In further, whether you had already used the logic analyzer or oscilloscope for testing, if yes, please share the testing result, thus I can learn the more information and dig much deeper.
Looking forward to your reply.

Have a great day,
TIC

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Re: RT1020 SEMC DBI

CCandido — Thu, 04 Apr 2019 17:21:00 GMT

hi jeremyzhou,

problems not solded,

using only SDRAM, read and write ok, using only Logic Analyzer see WR pulse ok.

using only DBI code, using Logic Analyzer see WR/Data, not pulse when write value.

does not have this function in sdk.

my test with: MIMXRT1020-EVK

thanks,

Carlos.

Re: RT1020 SEMC DBI

jeremyzhou — Mon, 08 Apr 2019 09:29:06 GMT

Hi Carlos Candido,

Thanks for your reply.
After reviewing your code, I find two errors below.
1. dbi_config.csxPinMux = 7; is not correct, please use the previous code.
dbi_config.csxPinMux = kSEMC_MUXCSX1;
2. SEMC_WE is not used to interface LCD, the section 24.5.3 illustrates how to employ pin to interface different device.
Please check them.

Have a great day,
TIC

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Re: RT1020 SEMC DBI

CCandido — Mon, 15 Apr 2019 20:05:44 GMT

Hi jeremyzhou ,

Thank you for your help.