topic Re: How can I use nhs3152's SPI interface? in NFC

How can I use nhs3152's SPI interface?

liliao — Fri, 12 Apr 2019 07:10:03 GMT

nhs3152‌lpcxpresso sdk‌

Hello, I want to use nhs3152's spi interface to communicate ADS1292R(from TI). But when I set the setting as User's guide, I found that the SPI driver isn't work as I hope. Here are my settings:

/* SSP initialization */
Init_SSP_PinMux();
Chip_SSP_Init(NSS_SSP);

ssp_format.frameFormat = SSP_FRAME_FORMAT_SPI;
ssp_format.bits = SSP_DATA_BITS;
ssp_format.clockMode = SSP_CLOCK_MODE0;
Chip_SSP_SetMaster(NSS_SSP, SSP_MODE_TEST);
Chip_SSP_SetFormat(NSS_SSP, ssp_format.bits, ssp_format.frameFormat, ssp_format.clockMode);
Chip_SSP_SetBitRate(NSS_SSP, 100000);

Buffer_Init();
/* Setup SSP buffer */
xf_setup.length = BUFFER_SIZE;
xf_setup.tx_data = Tx_Buf;
xf_setup.rx_data = Rx_Buf;
xf_setup.rx_cnt = xf_setup.tx_cnt = 0;

It would always run to a error condition which shows Overun.

Re: How can I use nhs3152's SPI interface?

mario_castaneda — Tue, 16 Apr 2019 23:04:55 GMT

Hi,

Could you please check the pin's voltage in the SPI pins without connecting the TI board?

Please let me know if you are getting the same return issue.

Regards,

Mario

Re: How can I use nhs3152's SPI interface?

liliao — Wed, 17 Apr 2019 01:38:53 GMT

Hi, I don't know why. But when I check the pin's voltage, it seems that voltage is just about 1V. After changed another nhs3152 chip, the output is back to 2.7V.

For application reason, I need to simulate SPI through GPIO now. Unfortunately, using some configurations like example does not actuate pins.

some pins don't work at all, some start working, however, the voltage is 1+V. the configuration is as follows:

Chip_Clock_System_SetClockFreq(NSS_SFRO_FREQUENCY/2);

Board_Init();

Chip_IOCON_SetPinConfig(NSS_IOCON, IOCON_PIO0_8, IOCON_FUNC_0 |IOCON_RMODE_INACT); /* MISO */
Chip_IOCON_SetPinConfig(NSS_IOCON, IOCON_PIO0_9, IOCON_FUNC_0 |IOCON_RMODE_INACT); /* MOSI */
Chip_IOCON_SetPinConfig(NSS_IOCON, IOCON_PIO0_2, IOCON_FUNC_0 |IOCON_RMODE_INACT); /* SSEL */
Chip_IOCON_SetPinConfig(NSS_IOCON, IOCON_PIO0_6, IOCON_FUNC_0 |IOCON_RMODE_INACT); /* SCLK */

Chip_GPIO_SetPinDIRInput(NSS_GPIO, Pinport, MISO);
Chip_GPIO_SetPinDIROutput(NSS_GPIO, Pinport, MOSI);
Set_MOSI_Low; //define to set counterpart pin to the value I need
Chip_GPIO_SetPinDIROutput(NSS_GPIO, Pinport, SSEL);
Set_SSEL_High;
Chip_GPIO_SetPinDIROutput(NSS_GPIO, Pinport, SCLK);
Set_SCLK_Low;

May my answer will help you.

Regards,

Lee

Re: How can I use nhs3152's SPI interface?

liliao — Wed, 17 Apr 2019 03:01:14 GMT

Hi, I don't know why. But when I check the pin's voltage, it seems that voltage is just about 1V. After changed another nhs3152 chip, the output is back to 2.7V.

For application reason, I need to simulate SPI through GPIO now. Unfortunately, using some configurations like example does not actuate pins.

some pins don't work at all, some start working, however, the voltage is 1+V. the configuration is as follows:

Chip_Clock_System_SetClockFreq(NSS_SFRO_FREQUENCY/2);

Board_Init();

May my answer will help you.

Regards,

Lee

Re: How can I use nhs3152's SPI interface?

mario_castaneda — Mon, 22 Apr 2019 20:25:47 GMT

Hi,

You can run a simple test using a GPIO.

For example the led.c

        Chip_IOCON_SetPinConfig(NSS_IOCON, sLeds[n].pio, IOCON_FUNC_0 | IOCON_RMODE_INACT);
        Chip_GPIO_SetPinDIROutput(NSS_GPIO, sLeds[n].port, sLeds[n].pin);‍‍
        Chip_GPIO_SetPinState(NSS_GPIO, sLeds[n].port, sLeds[n].pin, ((states >> n) & 1) == sLeds[n].polarity);‍‍‍

Regards,

Mario

Re: How can I use nhs3152's SPI interface?

driesmoors — Tue, 23 Apr 2019 11:45:13 GMT

Hi,

Can you compare your code with the example code snippets listed in the documentation? See <SDK>/docs/firmware.html, NHS31xx SW API > Modules > Drivers > ssp: Serial Peripheral Interface / Synchronous Serial Port controller, scroll down to example 1 and example 2.

Best,
Dries.