C++ (Cpp) Chip_SSP_SetClockRate Examples

Example #1

File: spi.c Project: bwalex/lpc11u24_experiments

static
void
spi_ensure_settings(spi_desc_t *desc)
{
	/*
	 * Ensure SPI module is set up with the correct
	 * settings, etc.
	 */
	/*
	 * XXX: plenty of scope for optimization, by not doing this over and
	 *      over again if things are compatible.
	 */
	/*
	 * Chip_SSP_SetClock_Rate(..., clk_rate, prescale)
	 * The bit frequency is PCLK / (prescale * [clk_rate+1])
	 */
	Chip_SSP_SetClockRate(desc->spi_dev, 0, 4);
	//dev->clock_khz = desc->max_clock_khz;

	Chip_SSP_SetFormat(desc->spi_dev, SSP_BITS_8, SSP_FRAMEFORMAT_SPI, SSP_CLOCK_CPHA0_CPOL0);
	//dev->clock_pol = desc->clock_pol;

	Chip_SSP_SetMaster(desc->spi_dev, 1);
	Chip_SSP_Enable(desc->spi_dev);
}

Example #2

File: ssp_18xx_43xx.c Project: SurEmprendimientosTecnologicos/ciaa_Firmware

/* Set the clock frequency for SSP interface */
void Chip_SSP_SetBitRate(LPC_SSP_T *pSSP, uint32_t bitRate)
{
	uint32_t ssp_clk, cr0_div, cmp_clk, prescale;

	ssp_clk = Chip_Clock_GetRate(Chip_SSP_GetClockIndex(pSSP));

	cr0_div = 0;
	cmp_clk = 0xFFFFFFFF;
	prescale = 2;

	while (cmp_clk > bitRate) {
		cmp_clk = ssp_clk / ((cr0_div + 1) * prescale);
		if (cmp_clk > bitRate) {
			cr0_div++;
			if (cr0_div > 0xFF) {
				cr0_div = 0;
				prescale += 2;
			}
		}
	}

	Chip_SSP_SetClockRate(pSSP, cr0_div, prescale);
}

Example #3

File: ads1248.c Project: ppejic/temperatura

void Chip_ADS1248_Init()
{
	Chip_SSP_DeInit(ADS_SSP);																													//Clear previous setup
	Chip_GPIO_Init(LPC_GPIO);																													//Init GPIO
	
	Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_IOCON);
	
	Chip_IOCON_PinMuxSet(LPC_IOCON, ADS_SCLK, IOCON_FUNC2); 													//SCLK
	Chip_IOCON_PinMuxSet(LPC_IOCON, ADS_MOSI, IOCON_FUNC2); 													//MOSI
	Chip_IOCON_PinMuxSet(LPC_IOCON, ADS_MISO, IOCON_FUNC2); 													//MISO
	Chip_IOCON_PinMuxSet(LPC_IOCON, ADS_nSSEL1, IOCON_FUNC0 | IOCON_MODE_PULLUP);			
	Chip_IOCON_PinMuxSet(LPC_IOCON, ADS_START1, IOCON_FUNC0 | IOCON_MODE_PULLUP); 		
	Chip_IOCON_PinMuxSet(LPC_IOCON, ADS_nRESET1,IOCON_FUNC0	| IOCON_MODE_PULLUP);
	Chip_IOCON_PinMuxSet(LPC_IOCON, ADS_nSSEL0, IOCON_FUNC0 | IOCON_MODE_PULLUP);			
	Chip_IOCON_PinMuxSet(LPC_IOCON, ADS_START0, IOCON_FUNC0 | IOCON_MODE_PULLUP); 		
	Chip_IOCON_PinMuxSet(LPC_IOCON, ADS_nRESET0,IOCON_FUNC0	| IOCON_MODE_PULLUP);
	Chip_IOCON_PinMuxSet(LPC_IOCON, ADS_nDRDY0, IOCON_FUNC0 | IOCON_MODE_PULLUP);
	Chip_IOCON_PinMuxSet(LPC_IOCON, ADS_nDRDY1, IOCON_FUNC0 | IOCON_MODE_PULLUP);
	
	Chip_GPIO_SetPinDIROutput(LPC_GPIO, ADS_nSSEL1);
	Chip_GPIO_SetPinDIROutput(LPC_GPIO, ADS_START1);
	Chip_GPIO_SetPinDIROutput(LPC_GPIO, ADS_nRESET1);	
	Chip_GPIO_SetPinDIROutput(LPC_GPIO, ADS_nSSEL0);
	Chip_GPIO_SetPinDIROutput(LPC_GPIO, ADS_START0);
	Chip_GPIO_SetPinDIROutput(LPC_GPIO, ADS_nRESET0);
	Chip_GPIO_SetPinDIRInput(LPC_GPIO,  ADS_nDRDY0);
	Chip_GPIO_SetPinDIRInput(LPC_GPIO,  ADS_nDRDY1);
	
	Chip_GPIO_SetPinOutHigh(LPC_GPIO, ADS_nSSEL1);
	Chip_GPIO_SetPinOutHigh(LPC_GPIO, ADS_nRESET1);
	Chip_GPIO_SetPinOutHigh(LPC_GPIO, ADS_START1);
	Chip_GPIO_SetPinOutHigh(LPC_GPIO, ADS_nSSEL0);
	Chip_GPIO_SetPinOutHigh(LPC_GPIO, ADS_nRESET0);
	Chip_GPIO_SetPinOutHigh(LPC_GPIO, ADS_START0);
			
	Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_PINT);
	Chip_SYSCTL_SetPinInterrupt(0, ADS_nDRDY0);
	Chip_PININT_SetPinModeEdge(LPC_PININT, PININTCH(0));
	Chip_PININT_EnableIntLow(LPC_PININT, PININTCH(0));
	Chip_SYSCTL_EnablePINTWakeup(0);
			
	Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_PINT);
	Chip_SYSCTL_SetPinInterrupt(1, ADS_nDRDY1);
	Chip_PININT_SetPinModeEdge(LPC_PININT, PININTCH(1));
	Chip_PININT_EnableIntLow(LPC_PININT, PININTCH(1));
	Chip_SYSCTL_EnablePINTWakeup(1);
		
	Chip_SSP_Init(ADS_SSP);	
	ssp_format.frameFormat = SSP_FRAMEFORMAT_SPI;																			//SPI Frame
	ssp_format.bits = SSP_BITS_8;																											//8bits 
	ssp_format.clockMode = SSP_CLOCK_CPHA1_CPOL0;																			//CPHA=1, CPOL=0	
	Chip_SSP_SetFormat(ADS_SSP, ssp_format.bits, ssp_format.frameFormat, ssp_format.clockMode);		
	Chip_SSP_Set_Mode(ADS_SSP, SSP_MODE_MASTER);
	
	Chip_SSP_SetClockRate(ADS_SSP, 1, 16);		
	Chip_Clock_SetSSP1ClockDiv(1);																										
	
	Chip_SSP_Enable(ADS_SSP);
	
	ADS1248_PeriphInit(CHIP_U1);
	ADS1248_PeriphInit(CHIP_U3);
}