How can I use nhs3152's SPI interface?

[liliao]

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.

[driesmoors]

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. 

[liliao]

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

[mario_castaneda]

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

[mario_castaneda]

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

[liliao]

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