diff options
Diffstat (limited to 'arch/arm/lpc17xx/Drivers/source/lpc17xx_spi.c')
| -rw-r--r-- | arch/arm/lpc17xx/Drivers/source/lpc17xx_spi.c | 431 |
1 files changed, 431 insertions, 0 deletions
diff --git a/arch/arm/lpc17xx/Drivers/source/lpc17xx_spi.c b/arch/arm/lpc17xx/Drivers/source/lpc17xx_spi.c new file mode 100644 index 0000000..7643de7 --- /dev/null +++ b/arch/arm/lpc17xx/Drivers/source/lpc17xx_spi.c @@ -0,0 +1,431 @@ +/***********************************************************************//**
+ * @file lpc17xx_spi.c
+ * @brief Contains all functions support for SPI firmware library on LPC17xx
+ * @version 2.0
+ * @date 21. May. 2010
+ * @author NXP MCU SW Application Team
+ **************************************************************************
+ * Software that is described herein is for illustrative purposes only
+ * which provides customers with programming information regarding the
+ * products. This software is supplied "AS IS" without any warranties.
+ * NXP Semiconductors assumes no responsibility or liability for the
+ * use of the software, conveys no license or title under any patent,
+ * copyright, or mask work right to the product. NXP Semiconductors
+ * reserves the right to make changes in the software without
+ * notification. NXP Semiconductors also make no representation or
+ * warranty that such application will be suitable for the specified
+ * use without further testing or modification.
+ **********************************************************************/
+
+/* Peripheral group ----------------------------------------------------------- */
+/** @addtogroup SPI
+ * @{
+ */
+
+/* Includes ------------------------------------------------------------------- */
+#include "lpc17xx_spi.h"
+#include "lpc17xx_clkpwr.h"
+
+/* If this source file built with example, the LPC17xx FW library configuration
+ * file in each example directory ("lpc17xx_libcfg.h") must be included,
+ * otherwise the default FW library configuration file must be included instead
+ */
+#ifdef __BUILD_WITH_EXAMPLE__
+#include "lpc17xx_libcfg.h"
+#else
+#include "lpc17xx_libcfg_default.h"
+#endif /* __BUILD_WITH_EXAMPLE__ */
+
+#ifdef _SPI
+
+
+/* Public Functions ----------------------------------------------------------- */
+/** @addtogroup SPI_Public_Functions
+ * @{
+ */
+
+/*********************************************************************//**
+ * @brief Setup clock rate for SPI device
+ * @param[in] SPIx SPI peripheral definition, should be LPC_SPI
+ * @param[in] target_clock : clock of SPI (Hz)
+ * @return None
+ ***********************************************************************/
+void SPI_SetClock (LPC_SPI_TypeDef *SPIx, uint32_t target_clock)
+{
+ uint32_t spi_pclk;
+ uint32_t prescale, temp;
+
+ CHECK_PARAM(PARAM_SPIx(SPIx));
+
+ if (SPIx == LPC_SPI){
+ spi_pclk = CLKPWR_GetPCLK (CLKPWR_PCLKSEL_SPI);
+ } else {
+ return;
+ }
+
+ prescale = 8;
+ // Find closest clock to target clock
+ while (1){
+ temp = target_clock * prescale;
+ if (temp >= spi_pclk){
+ break;
+ }
+ prescale += 2;
+ if(prescale >= 254){
+ break;
+ }
+ }
+
+ // Write to register
+ SPIx->SPCCR = SPI_SPCCR_COUNTER(prescale);
+}
+
+
+/*********************************************************************//**
+ * @brief De-initializes the SPIx peripheral registers to their
+* default reset values.
+ * @param[in] SPIx SPI peripheral selected, should be LPC_SPI
+ * @return None
+ **********************************************************************/
+void SPI_DeInit(LPC_SPI_TypeDef *SPIx)
+{
+ CHECK_PARAM(PARAM_SPIx(SPIx));
+
+ if (SPIx == LPC_SPI){
+ /* Set up clock and power for SPI module */
+ CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCSPI, DISABLE);
+ }
+}
+
+/*********************************************************************//**
+ * @brief Get data bit size per transfer
+ * @param[in] SPIx SPI peripheral selected, should be LPC_SPI
+ * @return number of bit per transfer, could be 8-16
+ **********************************************************************/
+uint8_t SPI_GetDataSize (LPC_SPI_TypeDef *SPIx)
+{
+ CHECK_PARAM(PARAM_SPIx(SPIx));
+ return ((SPIx->SPCR)>>8 & 0xF);
+}
+
+/********************************************************************//**
+ * @brief Initializes the SPIx peripheral according to the specified
+* parameters in the UART_ConfigStruct.
+ * @param[in] SPIx SPI peripheral selected, should be LPC_SPI
+ * @param[in] SPI_ConfigStruct Pointer to a SPI_CFG_Type structure
+* that contains the configuration information for the
+* specified SPI peripheral.
+ * @return None
+ *********************************************************************/
+void SPI_Init(LPC_SPI_TypeDef *SPIx, SPI_CFG_Type *SPI_ConfigStruct)
+{
+ uint32_t tmp;
+
+ CHECK_PARAM(PARAM_SPIx(SPIx));
+
+ if(SPIx == LPC_SPI){
+ /* Set up clock and power for UART module */
+ CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCSPI, ENABLE);
+ } else {
+ return;
+ }
+
+ // Configure SPI, interrupt is disable as default
+ tmp = ((SPI_ConfigStruct->CPHA) | (SPI_ConfigStruct->CPOL) \
+ | (SPI_ConfigStruct->DataOrder) | (SPI_ConfigStruct->Databit) \
+ | (SPI_ConfigStruct->Mode) | SPI_SPCR_BIT_EN) & SPI_SPCR_BITMASK;
+ // write back to SPI control register
+ SPIx->SPCR = tmp;
+
+ // Set clock rate for SPI peripheral
+ SPI_SetClock(SPIx, SPI_ConfigStruct->ClockRate);
+
+ // If interrupt flag is set, Write '1' to Clear interrupt flag
+ if (SPIx->SPINT & SPI_SPINT_INTFLAG){
+ SPIx->SPINT = SPI_SPINT_INTFLAG;
+ }
+}
+
+
+
+/*****************************************************************************//**
+* @brief Fills each SPI_InitStruct member with its default value:
+* - CPHA = SPI_CPHA_FIRST
+* - CPOL = SPI_CPOL_HI
+* - ClockRate = 1000000
+* - DataOrder = SPI_DATA_MSB_FIRST
+* - Databit = SPI_DATABIT_8
+* - Mode = SPI_MASTER_MODE
+* @param[in] SPI_InitStruct Pointer to a SPI_CFG_Type structure
+* which will be initialized.
+* @return None
+*******************************************************************************/
+void SPI_ConfigStructInit(SPI_CFG_Type *SPI_InitStruct)
+{
+ SPI_InitStruct->CPHA = SPI_CPHA_FIRST;
+ SPI_InitStruct->CPOL = SPI_CPOL_HI;
+ SPI_InitStruct->ClockRate = 1000000;
+ SPI_InitStruct->DataOrder = SPI_DATA_MSB_FIRST;
+ SPI_InitStruct->Databit = SPI_DATABIT_8;
+ SPI_InitStruct->Mode = SPI_MASTER_MODE;
+}
+
+/*********************************************************************//**
+ * @brief Transmit a single data through SPIx peripheral
+ * @param[in] SPIx SPI peripheral selected, should be LPC_SPI
+ * @param[in] Data Data to transmit (must be 16 or 8-bit long,
+ * this depend on SPI data bit number configured)
+ * @return none
+ **********************************************************************/
+void SPI_SendData(LPC_SPI_TypeDef* SPIx, uint16_t Data)
+{
+ CHECK_PARAM(PARAM_SPIx(SPIx));
+
+ SPIx->SPDR = Data & SPI_SPDR_BITMASK;
+}
+
+
+
+/*********************************************************************//**
+ * @brief Receive a single data from SPIx peripheral
+ * @param[in] SPIx SPI peripheral selected, should be LPC_SPI
+ * @return Data received (16-bit long)
+ **********************************************************************/
+uint16_t SPI_ReceiveData(LPC_SPI_TypeDef* SPIx)
+{
+ CHECK_PARAM(PARAM_SPIx(SPIx));
+
+ return ((uint16_t) (SPIx->SPDR & SPI_SPDR_BITMASK));
+}
+
+/*********************************************************************//**
+ * @brief SPI Read write data function
+ * @param[in] SPIx Pointer to SPI peripheral, should be LPC_SPI
+ * @param[in] dataCfg Pointer to a SPI_DATA_SETUP_Type structure that
+ * contains specified information about transmit
+ * data configuration.
+ * @param[in] xfType Transfer type, should be:
+ * - SPI_TRANSFER_POLLING: Polling mode
+ * - SPI_TRANSFER_INTERRUPT: Interrupt mode
+ * @return Actual Data length has been transferred in polling mode.
+ * In interrupt mode, always return (0)
+ * Return (-1) if error.
+ * Note: This function can be used in both master and slave mode.
+ ***********************************************************************/
+int32_t SPI_ReadWrite (LPC_SPI_TypeDef *SPIx, SPI_DATA_SETUP_Type *dataCfg, \
+ SPI_TRANSFER_Type xfType)
+{
+ uint8_t *rdata8;
+ uint8_t *wdata8;
+ uint16_t *rdata16;
+ uint16_t *wdata16;
+ uint32_t stat;
+ uint32_t temp;
+ uint8_t dataword;
+
+ //read for empty buffer
+ temp = SPIx->SPDR;
+ //dummy to clear status
+ temp = SPIx->SPSR;
+ dataCfg->counter = 0;
+ dataCfg->status = 0;
+
+ if(SPI_GetDataSize (SPIx) == 8)
+ dataword = 0;
+ else dataword = 1;
+ if (xfType == SPI_TRANSFER_POLLING){
+
+ if (dataword == 0){
+ rdata8 = (uint8_t *)dataCfg->rx_data;
+ wdata8 = (uint8_t *)dataCfg->tx_data;
+ } else {
+ rdata16 = (uint16_t *)dataCfg->rx_data;
+ wdata16 = (uint16_t *)dataCfg->tx_data;
+ }
+
+ while(dataCfg->counter < dataCfg->length)
+ {
+ // Write data to buffer
+ if(dataCfg->tx_data == NULL){
+ if (dataword == 0){
+ SPI_SendData(SPIx, 0xFF);
+ } else {
+ SPI_SendData(SPIx, 0xFFFF);
+ }
+ } else {
+ if (dataword == 0){
+ SPI_SendData(SPIx, *wdata8);
+ wdata8++;
+ } else {
+ SPI_SendData(SPIx, *wdata16);
+ wdata16++;
+ }
+ }
+ // Wait for transfer complete
+ while (!((stat = SPIx->SPSR) & SPI_SPSR_SPIF));
+ // Check for error
+ if (stat & (SPI_SPSR_ABRT | SPI_SPSR_MODF | SPI_SPSR_ROVR | SPI_SPSR_WCOL)){
+ // save status
+ dataCfg->status = stat | SPI_STAT_ERROR;
+ return (dataCfg->counter);
+ }
+ // Read data from SPI dat
+ temp = (uint32_t) SPI_ReceiveData(SPIx);
+
+ // Store data to destination
+ if (dataCfg->rx_data != NULL)
+ {
+ if (dataword == 0){
+ *(rdata8) = (uint8_t) temp;
+ rdata8++;
+ } else {
+ *(rdata16) = (uint16_t) temp;
+ rdata16++;
+ }
+ }
+ // Increase counter
+ if (dataword == 0){
+ dataCfg->counter++;
+ } else {
+ dataCfg->counter += 2;
+ }
+ }
+
+ // Return length of actual data transferred
+ // save status
+ dataCfg->status = stat | SPI_STAT_DONE;
+ return (dataCfg->counter);
+ }
+ // Interrupt mode
+ else {
+
+ // Check if interrupt flag is already set
+ if(SPIx->SPINT & SPI_SPINT_INTFLAG){
+ SPIx->SPINT = SPI_SPINT_INTFLAG;
+ }
+ if (dataCfg->counter < dataCfg->length){
+ // Write data to buffer
+ if(dataCfg->tx_data == NULL){
+ if (dataword == 0){
+ SPI_SendData(SPIx, 0xFF);
+ } else {
+ SPI_SendData(SPIx, 0xFFFF);
+ }
+ } else {
+ if (dataword == 0){
+ SPI_SendData(SPIx, (*(uint8_t *)dataCfg->tx_data));
+ } else {
+ SPI_SendData(SPIx, (*(uint16_t *)dataCfg->tx_data));
+ }
+ }
+ SPI_IntCmd(SPIx, ENABLE);
+ } else {
+ // Save status
+ dataCfg->status = SPI_STAT_DONE;
+ }
+ return (0);
+ }
+}
+
+
+/********************************************************************//**
+ * @brief Enable or disable SPIx interrupt.
+ * @param[in] SPIx SPI peripheral selected, should be LPC_SPI
+ * @param[in] NewState New state of specified UART interrupt type,
+ * should be:
+ * - ENALBE: Enable this SPI interrupt.
+* - DISALBE: Disable this SPI interrupt.
+ * @return None
+ *********************************************************************/
+void SPI_IntCmd(LPC_SPI_TypeDef *SPIx, FunctionalState NewState)
+{
+ CHECK_PARAM(PARAM_SPIx(SPIx));
+ CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState));
+
+ if (NewState == ENABLE)
+ {
+ SPIx->SPCR |= SPI_SPCR_SPIE;
+ }
+ else
+ {
+ SPIx->SPCR &= (~SPI_SPCR_SPIE) & SPI_SPCR_BITMASK;
+ }
+}
+
+
+/********************************************************************//**
+ * @brief Checks whether the SPI interrupt flag is set or not.
+ * @param[in] SPIx SPI peripheral selected, should be LPC_SPI
+ * @return The new state of SPI Interrupt Flag (SET or RESET)
+ *********************************************************************/
+IntStatus SPI_GetIntStatus (LPC_SPI_TypeDef *SPIx)
+{
+ CHECK_PARAM(PARAM_SPIx(SPIx));
+
+ return ((SPIx->SPINT & SPI_SPINT_INTFLAG) ? SET : RESET);
+}
+
+/********************************************************************//**
+ * @brief Clear SPI interrupt flag.
+ * @param[in] SPIx SPI peripheral selected, should be LPC_SPI
+ * @return None
+ *********************************************************************/
+void SPI_ClearIntPending(LPC_SPI_TypeDef *SPIx)
+{
+ CHECK_PARAM(PARAM_SPIx(SPIx));
+
+ SPIx->SPINT = SPI_SPINT_INTFLAG;
+}
+
+/********************************************************************//**
+ * @brief Get current value of SPI Status register in SPIx peripheral.
+ * @param[in] SPIx SPI peripheral selected, should be LPC_SPI
+ * @return Current value of SPI Status register in SPI peripheral.
+ * Note: The return value of this function must be used with
+ * SPI_CheckStatus() to determine current flag status
+ * corresponding to each SPI status type. Because some flags in
+ * SPI Status register will be cleared after reading, the next reading
+ * SPI Status register could not be correct. So this function used to
+ * read SPI status register in one time only, then the return value
+ * used to check all flags.
+ *********************************************************************/
+uint32_t SPI_GetStatus(LPC_SPI_TypeDef* SPIx)
+{
+ CHECK_PARAM(PARAM_SPIx(SPIx));
+
+ return (SPIx->SPSR & SPI_SPSR_BITMASK);
+}
+
+/********************************************************************//**
+ * @brief Checks whether the specified SPI Status flag is set or not
+ * via inputSPIStatus parameter.
+ * @param[in] inputSPIStatus Value to check status of each flag type.
+ * This value is the return value from SPI_GetStatus().
+ * @param[in] SPIStatus Specifies the SPI status flag to check,
+ * should be one of the following:
+ - SPI_STAT_ABRT: Slave abort.
+ - SPI_STAT_MODF: Mode fault.
+ - SPI_STAT_ROVR: Read overrun.
+ - SPI_STAT_WCOL: Write collision.
+ - SPI_STAT_SPIF: SPI transfer complete.
+ * @return The new state of SPIStatus (SET or RESET)
+ *********************************************************************/
+FlagStatus SPI_CheckStatus (uint32_t inputSPIStatus, uint8_t SPIStatus)
+{
+ CHECK_PARAM(PARAM_SPI_STAT(SPIStatus));
+
+ return ((inputSPIStatus & SPIStatus) ? SET : RESET);
+}
+
+
+/**
+ * @}
+ */
+
+#endif /* _SPI */
+
+/**
+ * @}
+ */
+
+/* --------------------------------- End Of File ------------------------------ */
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