topic LPC11C24 using SSP1 in LPC Microcontrollers

LPC11C24 using SSP1

sukkinpang — Thu, 07 Jul 2016 13:54:46 GMT

I'm using the LPC11C24 and it has been successful on SSP0. Now I want to use SSP1 is well. I've set the PinMux to:

Chip_IOCON_PinMuxSet(LPC_IOCON, IOCON_PIO2_2, (IOCON_FUNC1 \| IOCON_MODE_INACT));	// MISO1
Chip_IOCON_PinMuxSet(LPC_IOCON, IOCON_PIO2_3, (IOCON_FUNC1 \| IOCON_MODE_INACT));	// MOSI1
Chip_IOCON_PinMuxSet(LPC_IOCON, IOCON_PIO2_0, (IOCON_FUNC1 \| IOCON_MODE_INACT));	// SSEL1
Chip_IOCON_PinMuxSet(LPC_IOCON, IOCON_PIO2_1, (IOCON_FUNC1 \| IOCON_MODE_INACT));	// SCK1

#define LPC_SSP LPC_SSP1

Using the same code for the SSP0 and with a scope on SSEL1 and SCK1 I can't see any signals.

Is there anything else that need to be configured for use with SSP1?

Re: LPC11C24 using SSP1

rolfmeeser — Thu, 07 Jul 2016 15:14:05 GMT

Double-check that the SSP1 is not in reset mode (SYSCON.PRESETCTRL.2)

Make sure the clock divider for SSP1 is set to a non-zero value in SYSCON.SSP1CLKDIV

Try adding 0xC0 to the mode bits (as in (IOCON_FUNC1 | IOCON_MODE_INACT | 0xC0) )

Re: LPC11C24 using SSP1

sukkinpang — Fri, 08 Jul 2016 09:51:39 GMT

Adding | 0xC0 didn't help. Checking SYSCON.PRESETCTRL.2 is not easy as everything is abstracted, I'm using the npx_lpcxpresso_11c24_periph_ssp example.

I just changed the #define LPC_SSP LPC_SSP0 to #define LPC_SSP LPC_SSP1

and changed the pinmux setting.

I have found this SSP1 example to be working. It uses these settings

//SET UP THE SPI

LPC_IOCON->PIO2_3 = (LPC_IOCON->PIO2_3 & ~(0x3)) | 0x2; //set PIO2_3 up as MOSI function (sec. 7.4.34)

LPC_IOCON->PIO2_2 = (LPC_IOCON->PIO2_2 & ~(0x3)) | 0x2; //set PIO2_2 up as MISO function (sec. 7.4.22)

LPC_IOCON->PIO2_0 = (LPC_IOCON->PIO2_0 & ~(0x3)) | 0x2; //set PIO2_0 up as SSEL function (sec. 7.4.2)

LPC_IOCON->PIO2_1 = (LPC_IOCON->PIO2_1 & ~(0x3)) | 0x2; //set PIO2_1 up as SCK function (sec. 7.4.9)

LPC_SYSCON->SYSAHBCLKCTRL |= (1<<18); //enable clock to SPI1 block (sec. 3.5.14)

LPC_SYSCON->SSP1CLKDIV |= 0x2F; //enable SPI clk by writing non-zero clk divisor (sec. 3.5.17)

LPC_SYSCON->PRESETCTRL |= 0x04; //clear SPI reset, SPI held in reset by default (sec. 3.5.2)

LPC_SSP1->CR0 |= 0x07; //set for 8 bit transfer (sec. 14.6.1)

LPC_SSP1->CR1 |= 0x02; //enable SPI (sec. 14.6.2)

The trouble is, this project is based on the CMSIS and I can't put the above code in the lpcexpresso project. It won't compile.

Can someone please try the npx_lpcxpresso_11c24_periph_ssp example on SSP1.