Linux/DS90UB927Q-Q1: how to set I2S_WC/GPIO_REG07 and I2S_DA/GPIO_REG06 in ds90ub927-ds90ub924 as gpio，so can pass PWM？

user5381542

Prodigy 170 points

Part Number: DS90UB927Q-Q1

Tool/software: Linux

how to set I2S_WC/GPIO_REG07 and I2S_DA/GPIO_REG06 in ds90ub927-ds90ub924 as gpio，so can pass PWM？

I set register as blow：but it seems doesn‘t effect，

// i2c_send_slave_addr： 927 iic slave addr；i2c_rev_slave_addr：924 iic slave addr；

//927:GPIO_REG5,6,TFT_RST,bl_pwm,INPUT;

data = read_data(client, i2c_send_slave_addr, 0x10);
data &= 0x00;
write_data(client, i2c_send_slave_addr,0x10,(data|0x33));
//924::GPIO_REG5,6; outPUT:high
data = read_data(client, i2c_rev_slave_addr, 0x20);
data &= 0x00;
write_data(client, i2c_rev_slave_addr,0x20,(data|0x91)); //0x0e

//927:GPIO_REG7,,vcom_pwm,INPUT;
data = read_data(client, i2c_send_slave_addr, 0x11);
data &= 0x00;
write_data(client, i2c_send_slave_addr,0x10,(data|0x33));
//924::GPIO_REG7,; outPUT
data = read_data(client, i2c_rev_slave_addr, 0x21);
data &= 0x00;
write_data(client, i2c_rev_slave_addr,0x21,(data|0x11)); //0x0e

write_data(client, i2c_rev_slave_addr,0x2b,(0x40));

i reference the documents：snla234：Enabling GPIOs in the DS90UB925 and DS90UB926；

so my question is：can 927-924 gpio_reg6/7 set as gpio and pass PWM clk?

over 7 years ago

0 Steven(Shenzhen) Shi over 7 years ago

TI__Mastermind 30515 points

Carrick,
please refer to d/s, UB927's GPIO_REG pins are designed for local GPIO control. You can use GPIO0/1/2/3 for remote control to transmit PWM signal.

regards,
Steven

0 user5381542 over 7 years ago in reply to Steven(Shenzhen) Shi

Prodigy 170 points

thank you for reply,

but our customer Chery define these two pin as gpio to pass PWM,,hardware had been designed from Chery.and Chery's other suppliers have pass PWM by GPIO_REG6/7 successful;

so there must be way to set ,but how to set registers?

0 Steven(Shenzhen) Shi over 7 years ago in reply to user5381542

TI__Mastermind 30515 points

Please talk it from device function.
if you need use these two pins to transmit signals from ser to de-ser, you can use the I2S mode, and should have the I2S_CLK input to UB927. For this mode, the reused pins GPIO_REG6/7 can be used for remote GPIO control.

best regards,
Steven

0 Steven(Shenzhen) Shi over 7 years ago

TI__Mastermind 30515 points

You can refer to page6 of attached app. note www.ti.com/.../snla234.pdf, GPIO_REG6/7 (I2S_WC/DA) can be used as remote signal transmission. please note that the I2S_CLK should be ready for this operation.

regards,
Steven

0 user5381542 over 7 years ago in reply to Steven(Shenzhen) Shi

Prodigy 170 points

i have reference this Doc；
I2S_CLK must be toggling，mean what？ the input to I2S_CLK /GPIO_REG8 must be（1m-10m） clk？

0 user5381542 over 7 years ago in reply to Steven(Shenzhen) Shi

Prodigy 170 points

i have set i2s_clk input 1Mhz in 927；
and dump 927 Reg 0x10：0x00，0x11：0x00；924 Reg：0x20：0x00，0x21：0x00；0x2b：0x40；
now they are all in （0: Enable normal operation )；

and I2S_DA/GPIO_REG06 in 927 is 20khz，but I2S_DA/GPIO_REG06 in 924 is always Low；
Why？

can you try this in your demo board？

0 user5381542 over 7 years ago in reply to Steven(Shenzhen) Shi

Prodigy 170 points

in your demo board，927-924 can pass PWM by I2S_DA/GPIO_REG06 ？

0 Steven(Shenzhen) Shi over 7 years ago in reply to user5381542

TI__Mastermind 30515 points

Carrick,
please refer to app. note pasted before, it is tested.

regards,
Steven

0 Steven(Shenzhen) Shi over 7 years ago in reply to user5381542

TI__Mastermind 30515 points

Yes, I2S_CLK must have >1MHz clock input, please refer to d/s on I2S application.

regards,
Steven

0 user5381542 over 7 years ago in reply to Steven(Shenzhen) Shi

Prodigy 170 points

i set I2S_CLK 2Mhz ，and I2S_DA 500Khz input in 927；my lvds clk is 63M;
now i can see 2Mhz clk in 924 by oscilloscope， but unfortunately，there is no signal at I2S_DA pin in 924

0 Steven(Shenzhen) Shi over 7 years ago in reply to user5381542

TI__Mastermind 30515 points

can you read the reg. 0x12/0x13/0x1A on I2S data path control message?

Steven

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Linux/DS90UB927Q-Q1: how to set I2S_WC/GPIO_REG07 and I2S_DA/GPIO_REG06 in ds90ub927-ds90ub924 as gpio，so can pass PWM？