void spi_receive_block (
uint8_t *buff, /* Data buffer to store received data */
uint16_t byte_count /* Byte count (must be multiple of 4) */
)
{
uint16_t hwtr, startcnt, i, rec;
hwtr = byte_count/2;
if ( byte_count < FIFO_ELEM ) {
startcnt = hwtr;
} else {
startcnt = FIFO_ELEM;
}
pSPI->CR0 |= SSP_CR0_DSS(16); // DSS to 16 bit
for ( i = startcnt; i; i-- ) {
pSPI->DR = 0xffff; // fill TX FIFO
}
do {
while ( !(pSPI->SR & SSP_SR_RNE ) ) {
// wait for data in RX FIFO (RNE set)
}
rec = pSPI->DR;
if ( i < ( hwtr - startcnt ) ) {
pSPI->DR = 0xffff;
}
*buff++ = (uint8_t)(rec >> 8);
*buff++ = (uint8_t)(rec);
i++;
} while ( i < hwtr );
pSPI->CR0 = ( pSPI->CR0 & ~SSP_CR0_DSS(16) ) | SSP_CR0_DSS(8); // DSS to 8 bit
}
void spi_transmit_block (
const uint8_t *buff /* 512 byte data block to be transmitted */
)
{
uint16_t cnt;
int16_t data;
pSPI->CR0 |= SSP_CR0_DSS(16); // DSS to 16 bit
for ( cnt = 0; cnt < ( 512 / 2 ); cnt++ ) {
while ( !( pSPI->SR & SSP_SR_TNF ) ) {
; // wait for TX FIFO not full (TNF)
}
data = (*buff++) << 8;
data |= *buff++;
pSPI->DR = data;
}
while ( pSPI->SR & SSP_SR_BSY ) {
// wait for BSY gone
}
while ( pSPI->SR & SSP_SR_RNE ) {
data = pSPI->DR; // drain receive FIFO
}
pSPI->CR0 = ( pSPI->CR0 & ~SSP_CR0_DSS(16) ) | SSP_CR0_DSS(8); // DSS to 8 bit
}
/***********************************************************************
*
* Function: ssp_configure
*
* Purpose: Configure SSP interface
*
* Processing:
* Setup the general capabilities of the SSP controller.
*
* Parameters:
* psspcfg : Pointer to an SSP_CONFIG_T structure
* psspdrvdat: Pointer to driver data
*
* Outputs: None
*
* Returns:
* _ERROR if the configuration setup failed, otherwise _NO_ERROR
*
* Notes: None
*
**********************************************************************/
static STATUS ssp_configure(SSP_CONFIG_T *psspcfg,
SSP_DRVDAT_T *psspdrvdat)
{
UNS_32 tmp0, tmp1;
STATUS setup = _NO_ERROR;
SSP_REGS_T *psspregs = psspdrvdat->regptr;
/* Setup CR0 word first */
tmp0 = 0;
if ((psspcfg->databits >= 4) && (psspcfg->databits <= 16))
{
tmp0 = SSP_CR0_DSS(psspcfg->databits);
}
else
{
setup = _ERROR;
}
if (psspcfg->databits <= 8)
{
psspdrvdat->dsize = 1;
}
else
{
psspdrvdat->dsize = 2;
}
/* Mode */
if (((psspcfg->mode & ~SSP_CR0_PRT_MSK) != 0) ||
(psspcfg->mode == (0x3 << 4)))
{
setup = _ERROR;
}
tmp0 |= psspcfg->mode;
/* SPI clock control */
if (psspcfg->highclk_spi_frames == TRUE)
{
tmp0 |= SSP_CR0_CPOL(1);
}
if (psspcfg->usesecond_clk_spi == TRUE)
{
tmp0 |= SSP_CR0_CPHA(1);
}
/* Master/slave mode control */
tmp1 = 0;
if (psspcfg->master_mode == FALSE)
{
tmp1 = SSP_CR1_MS;
}
/* Setup clock */
if (setup == _NO_ERROR)
{
psspregs->cr0 = tmp0;
psspregs->cr1 = tmp1;
setup = ssp_set_clock(psspdrvdat, psspcfg->ssp_clk);
}
return setup;
}
/**********************************************
ИНИЦИАЛИЗАЦИЯ СИСТЕМЫ ПРЕРЫВАНИЙ
**********************************************/
void InitializeInterruptSystem()
{
/* Initialize interrupt system */
int_initialize(0xFFFFFFFF);
/* Install standard IRQ dispatcher at ARM IRQ vector */
int_install_arm_vec_handler(IRQ_VEC, (PFV) lpc32xx_irq_handler);
/* Install standard FIQ dispatcher at ARM IRQ vector */
int_install_arm_vec_handler(FIQ_VEC, (PFV) lpc32xx_fiq_handler);
//---------------------HSTIMER------------------------------------
/* Install HSTIMER interrupt handler as a IRQ interrupts */
int_install_irq_handler(IRQ_HSTIMER,
(PFV) hstimer_user_interrupt);
// Save address of register block
hst_regptr = HSTIMER;
gpio_regptr = GPIO;
// LEDs off
//gpio_regptr->p3_outp_clr = LED1 | LED2;
//gpio_regptr->p1_dir_set = LED3;
// Enable timer system clock
clkpwr_clk_en_dis(CLKPWR_HSTIMER_CLK, 1);
// Disable high speed timer and match timers
hst_regptr->hstim_ctrl = HSTIM_CTRL_RESET_COUNT;
hst_regptr->hstim_mctrl = 0;
hst_regptr->hstim_ctrl = 0;
// Clear pending interrupts
hst_regptr->hstim_int = (HSTIM_MATCH0_INT |
HSTIM_MATCH1_INT | HSTIM_MATCH2_INT |
HSTIM_GPI_06_INT | HSTIM_RTC_TICK_INT);
hst_regptr->hstim_mctrl = HSTIM_CNTR_MCR_MTCH(0) | HSTIM_CNTR_MCR_RESET(0);
hst_regptr->hstim_pmatch = 13-1;
hst_regptr->hstim_match[0] = 1000;//1ms 000;
hst_regptr->hstim_ctrl = HSTIM_CTRL_COUNT_ENAB;//start hstimer
// Enable interrupt in the interrupt controller
int_enable(IRQ_HSTIMER);
//---------------------SSP1------------------------------------
ssp1_regptr = SSP1; // Pointer to SSP1 registers
// Enable ssp1 system clock
clkpwr_clk_en_dis(CLKPWR_SSP1_CLK, 1);
//конфигурация IO
gpio_regptr->p2_mux_clr = P2_GPIO04_SSEL1;
gpio_regptr->p2_dir_set = P2_DIR_GPIO(4);
gpio_regptr->p3_outp_set = P3_STATE_GPIO(4);
/* The MISO, MOSI, and SCK signals are controlled by the SSP1 */
gpio_regptr->p_mux_set = (P_SPI2DATAIO_MOSI1 |
P_SPI2DATAIN_MISO1 | P_SPI2CLK_SCK1);
ssp1_regptr->cpsr = SSP_CPSR_CPDVSR(16);//8);//4);//4);//prescale
//ssp_clk / ((cr0_div + 1) * prescale);
//prescale = 16; SCR = 4 - 1.25MGz
ssp1_regptr->cr0 = SSP_CR0_DSS(8) |//data size 8 bit
SSP_CR0_FRF_SPI |//Motorola SPI mode
SSP_CR0_SCR(4);//serial clock rate
// Default Master mode
// Disable SSP1
ssp1_regptr->cr1 &= ~SSP_CR1_SSP_ENABLE;
// interr handler SSP1 IRQ
//int_install_irq_handler(IRQ_SSP1, (PFV) ssp1_user_interrupt);
// Enable interrupt in the interrupt controller
//int_enable(IRQ_SSP1);
// Clear interrupt in the interrupt controller
//int_clear(IRQ_SSP1);
// Enable SSP1
ssp1_regptr->cr1 |= SSP_CR1_SSP_ENABLE;
}//InitializeInterruptSystem()
