444 lines
16 KiB
C
444 lines
16 KiB
C
/**********************************************************************
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* $Id$ lpc17xx_spi.c 2010-05-21
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*//**
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* @file lpc17xx_spi.c
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* @brief Contains all functions support for SPI firmware library on LPC17xx
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* @version 2.0
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* @date 21. May. 2010
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* @author NXP MCU SW Application Team
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*
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* Copyright(C) 2010, NXP Semiconductor
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* All rights reserved.
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*
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***********************************************************************
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* Software that is described herein is for illustrative purposes only
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* which provides customers with programming information regarding the
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* products. This software is supplied "AS IS" without any warranties.
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* NXP Semiconductors assumes no responsibility or liability for the
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* use of the software, conveys no license or title under any patent,
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* copyright, or mask work right to the product. NXP Semiconductors
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* reserves the right to make changes in the software without
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* notification. NXP Semiconductors also make no representation or
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* warranty that such application will be suitable for the specified
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* use without further testing or modification.
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, under NXP Semiconductors'
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* relevant copyright in the software, without fee, provided that it
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* is used in conjunction with NXP Semiconductors microcontrollers. This
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* copyright, permission, and disclaimer notice must appear in all copies of
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* this code.
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**********************************************************************/
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/* Peripheral group ----------------------------------------------------------- */
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/** @addtogroup SPI
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* @{
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*/
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/* Includes ------------------------------------------------------------------- */
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#include "lpc17xx_spi.h"
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#include "lpc17xx_clkpwr.h"
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/* If this source file built with example, the LPC17xx FW library configuration
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* file in each example directory ("lpc17xx_libcfg.h") must be included,
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* otherwise the default FW library configuration file must be included instead
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*/
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#ifdef __BUILD_WITH_EXAMPLE__
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#include "lpc17xx_libcfg.h"
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#else
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#include "lpc17xx_libcfg_default.h"
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#endif /* __BUILD_WITH_EXAMPLE__ */
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#ifdef _SPI
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/* Public Functions ----------------------------------------------------------- */
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/** @addtogroup SPI_Public_Functions
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* @{
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*/
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/*********************************************************************//**
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* @brief Setup clock rate for SPI device
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* @param[in] SPIx SPI peripheral definition, should be LPC_SPI
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* @param[in] target_clock : clock of SPI (Hz)
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* @return None
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***********************************************************************/
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void SPI_SetClock (LPC_SPI_TypeDef *SPIx, uint32_t target_clock)
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{
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uint32_t spi_pclk;
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uint32_t prescale, temp;
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CHECK_PARAM(PARAM_SPIx(SPIx));
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if (SPIx == LPC_SPI){
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spi_pclk = CLKPWR_GetPCLK (CLKPWR_PCLKSEL_SPI);
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} else {
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return;
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}
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prescale = 8;
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// Find closest clock to target clock
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while (1){
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temp = target_clock * prescale;
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if (temp >= spi_pclk){
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break;
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}
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prescale += 2;
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if(prescale >= 254){
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break;
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}
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}
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// Write to register
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SPIx->SPCCR = SPI_SPCCR_COUNTER(prescale);
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}
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/*********************************************************************//**
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* @brief De-initializes the SPIx peripheral registers to their
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* default reset values.
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* @param[in] SPIx SPI peripheral selected, should be LPC_SPI
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* @return None
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**********************************************************************/
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void SPI_DeInit(LPC_SPI_TypeDef *SPIx)
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{
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CHECK_PARAM(PARAM_SPIx(SPIx));
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if (SPIx == LPC_SPI){
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/* Set up clock and power for SPI module */
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCSPI, DISABLE);
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}
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}
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/*********************************************************************//**
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* @brief Get data bit size per transfer
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* @param[in] SPIx SPI peripheral selected, should be LPC_SPI
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* @return number of bit per transfer, could be 8-16
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**********************************************************************/
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uint8_t SPI_GetDataSize (LPC_SPI_TypeDef *SPIx)
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{
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CHECK_PARAM(PARAM_SPIx(SPIx));
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return ((SPIx->SPCR)>>8 & 0xF);
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}
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/********************************************************************//**
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* @brief Initializes the SPIx peripheral according to the specified
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* parameters in the UART_ConfigStruct.
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* @param[in] SPIx SPI peripheral selected, should be LPC_SPI
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* @param[in] SPI_ConfigStruct Pointer to a SPI_CFG_Type structure
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* that contains the configuration information for the
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* specified SPI peripheral.
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* @return None
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*********************************************************************/
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void SPI_Init(LPC_SPI_TypeDef *SPIx, SPI_CFG_Type *SPI_ConfigStruct)
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{
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uint32_t tmp;
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CHECK_PARAM(PARAM_SPIx(SPIx));
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if(SPIx == LPC_SPI){
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/* Set up clock and power for UART module */
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCSPI, ENABLE);
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} else {
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return;
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}
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// Configure SPI, interrupt is disable as default
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tmp = ((SPI_ConfigStruct->CPHA) | (SPI_ConfigStruct->CPOL) \
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| (SPI_ConfigStruct->DataOrder) | (SPI_ConfigStruct->Databit) \
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| (SPI_ConfigStruct->Mode) | SPI_SPCR_BIT_EN) & SPI_SPCR_BITMASK;
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// write back to SPI control register
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SPIx->SPCR = tmp;
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// Set clock rate for SPI peripheral
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SPI_SetClock(SPIx, SPI_ConfigStruct->ClockRate);
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// If interrupt flag is set, Write '1' to Clear interrupt flag
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if (SPIx->SPINT & SPI_SPINT_INTFLAG){
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SPIx->SPINT = SPI_SPINT_INTFLAG;
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}
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}
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/*****************************************************************************//**
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* @brief Fills each SPI_InitStruct member with its default value:
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* - CPHA = SPI_CPHA_FIRST
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* - CPOL = SPI_CPOL_HI
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* - ClockRate = 1000000
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* - DataOrder = SPI_DATA_MSB_FIRST
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* - Databit = SPI_DATABIT_8
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* - Mode = SPI_MASTER_MODE
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* @param[in] SPI_InitStruct Pointer to a SPI_CFG_Type structure
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* which will be initialized.
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* @return None
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*******************************************************************************/
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void SPI_ConfigStructInit(SPI_CFG_Type *SPI_InitStruct)
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{
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SPI_InitStruct->CPHA = SPI_CPHA_FIRST;
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SPI_InitStruct->CPOL = SPI_CPOL_HI;
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SPI_InitStruct->ClockRate = 1000000;
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SPI_InitStruct->DataOrder = SPI_DATA_MSB_FIRST;
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SPI_InitStruct->Databit = SPI_DATABIT_8;
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SPI_InitStruct->Mode = SPI_MASTER_MODE;
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}
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/*********************************************************************//**
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* @brief Transmit a single data through SPIx peripheral
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* @param[in] SPIx SPI peripheral selected, should be LPC_SPI
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* @param[in] Data Data to transmit (must be 16 or 8-bit long,
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* this depend on SPI data bit number configured)
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* @return none
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**********************************************************************/
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void SPI_SendData(LPC_SPI_TypeDef* SPIx, uint16_t Data)
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{
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CHECK_PARAM(PARAM_SPIx(SPIx));
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SPIx->SPDR = Data & SPI_SPDR_BITMASK;
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}
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/*********************************************************************//**
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* @brief Receive a single data from SPIx peripheral
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* @param[in] SPIx SPI peripheral selected, should be LPC_SPI
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* @return Data received (16-bit long)
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**********************************************************************/
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uint16_t SPI_ReceiveData(LPC_SPI_TypeDef* SPIx)
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{
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CHECK_PARAM(PARAM_SPIx(SPIx));
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return ((uint16_t) (SPIx->SPDR & SPI_SPDR_BITMASK));
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}
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/*********************************************************************//**
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* @brief SPI Read write data function
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* @param[in] SPIx Pointer to SPI peripheral, should be LPC_SPI
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* @param[in] dataCfg Pointer to a SPI_DATA_SETUP_Type structure that
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* contains specified information about transmit
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* data configuration.
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* @param[in] xfType Transfer type, should be:
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* - SPI_TRANSFER_POLLING: Polling mode
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* - SPI_TRANSFER_INTERRUPT: Interrupt mode
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* @return Actual Data length has been transferred in polling mode.
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* In interrupt mode, always return (0)
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* Return (-1) if error.
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* Note: This function can be used in both master and slave mode.
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***********************************************************************/
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int32_t SPI_ReadWrite (LPC_SPI_TypeDef *SPIx, SPI_DATA_SETUP_Type *dataCfg, \
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SPI_TRANSFER_Type xfType)
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{
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uint8_t *rdata8;
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uint8_t *wdata8;
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uint16_t *rdata16;
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uint16_t *wdata16;
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uint32_t stat;
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uint32_t temp;
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uint8_t dataword;
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//read for empty buffer
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temp = SPIx->SPDR;
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//dummy to clear status
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temp = SPIx->SPSR;
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dataCfg->counter = 0;
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dataCfg->status = 0;
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if(SPI_GetDataSize (SPIx) == 8)
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dataword = 0;
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else dataword = 1;
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if (xfType == SPI_TRANSFER_POLLING){
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if (dataword == 0){
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rdata8 = (uint8_t *)dataCfg->rx_data;
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wdata8 = (uint8_t *)dataCfg->tx_data;
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} else {
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rdata16 = (uint16_t *)dataCfg->rx_data;
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wdata16 = (uint16_t *)dataCfg->tx_data;
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}
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while(dataCfg->counter < dataCfg->length)
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{
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// Write data to buffer
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if(dataCfg->tx_data == NULL){
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if (dataword == 0){
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SPI_SendData(SPIx, 0xFF);
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} else {
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SPI_SendData(SPIx, 0xFFFF);
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}
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} else {
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if (dataword == 0){
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SPI_SendData(SPIx, *wdata8);
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wdata8++;
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} else {
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SPI_SendData(SPIx, *wdata16);
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wdata16++;
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}
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}
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// Wait for transfer complete
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while (!((stat = SPIx->SPSR) & SPI_SPSR_SPIF));
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// Check for error
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if (stat & (SPI_SPSR_ABRT | SPI_SPSR_MODF | SPI_SPSR_ROVR | SPI_SPSR_WCOL)){
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// save status
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dataCfg->status = stat | SPI_STAT_ERROR;
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return (dataCfg->counter);
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}
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// Read data from SPI dat
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temp = (uint32_t) SPI_ReceiveData(SPIx);
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// Store data to destination
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if (dataCfg->rx_data != NULL)
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{
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if (dataword == 0){
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*(rdata8) = (uint8_t) temp;
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rdata8++;
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} else {
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*(rdata16) = (uint16_t) temp;
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rdata16++;
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}
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}
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// Increase counter
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if (dataword == 0){
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dataCfg->counter++;
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} else {
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dataCfg->counter += 2;
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}
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}
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// Return length of actual data transferred
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// save status
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dataCfg->status = stat | SPI_STAT_DONE;
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return (dataCfg->counter);
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}
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// Interrupt mode
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else {
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// Check if interrupt flag is already set
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if(SPIx->SPINT & SPI_SPINT_INTFLAG){
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SPIx->SPINT = SPI_SPINT_INTFLAG;
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}
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if (dataCfg->counter < dataCfg->length){
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// Write data to buffer
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if(dataCfg->tx_data == NULL){
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if (dataword == 0){
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SPI_SendData(SPIx, 0xFF);
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} else {
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SPI_SendData(SPIx, 0xFFFF);
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}
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} else {
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if (dataword == 0){
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SPI_SendData(SPIx, (*(uint8_t *)dataCfg->tx_data));
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} else {
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SPI_SendData(SPIx, (*(uint16_t *)dataCfg->tx_data));
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}
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}
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SPI_IntCmd(SPIx, ENABLE);
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} else {
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// Save status
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dataCfg->status = SPI_STAT_DONE;
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}
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return (0);
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}
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}
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/********************************************************************//**
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* @brief Enable or disable SPIx interrupt.
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* @param[in] SPIx SPI peripheral selected, should be LPC_SPI
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* @param[in] NewState New state of specified UART interrupt type,
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* should be:
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* - ENALBE: Enable this SPI interrupt.
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* - DISALBE: Disable this SPI interrupt.
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* @return None
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*********************************************************************/
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void SPI_IntCmd(LPC_SPI_TypeDef *SPIx, FunctionalState NewState)
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{
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CHECK_PARAM(PARAM_SPIx(SPIx));
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CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState));
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if (NewState == ENABLE)
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{
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SPIx->SPCR |= SPI_SPCR_SPIE;
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}
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else
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{
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SPIx->SPCR &= (~SPI_SPCR_SPIE) & SPI_SPCR_BITMASK;
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}
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}
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/********************************************************************//**
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* @brief Checks whether the SPI interrupt flag is set or not.
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* @param[in] SPIx SPI peripheral selected, should be LPC_SPI
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* @return The new state of SPI Interrupt Flag (SET or RESET)
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*********************************************************************/
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IntStatus SPI_GetIntStatus (LPC_SPI_TypeDef *SPIx)
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{
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CHECK_PARAM(PARAM_SPIx(SPIx));
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return ((SPIx->SPINT & SPI_SPINT_INTFLAG) ? SET : RESET);
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}
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/********************************************************************//**
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* @brief Clear SPI interrupt flag.
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* @param[in] SPIx SPI peripheral selected, should be LPC_SPI
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* @return None
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*********************************************************************/
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void SPI_ClearIntPending(LPC_SPI_TypeDef *SPIx)
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{
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CHECK_PARAM(PARAM_SPIx(SPIx));
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SPIx->SPINT = SPI_SPINT_INTFLAG;
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}
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/********************************************************************//**
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* @brief Get current value of SPI Status register in SPIx peripheral.
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* @param[in] SPIx SPI peripheral selected, should be LPC_SPI
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* @return Current value of SPI Status register in SPI peripheral.
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* Note: The return value of this function must be used with
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* SPI_CheckStatus() to determine current flag status
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* corresponding to each SPI status type. Because some flags in
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* SPI Status register will be cleared after reading, the next reading
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* SPI Status register could not be correct. So this function used to
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* read SPI status register in one time only, then the return value
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* used to check all flags.
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*********************************************************************/
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uint32_t SPI_GetStatus(LPC_SPI_TypeDef* SPIx)
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{
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CHECK_PARAM(PARAM_SPIx(SPIx));
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return (SPIx->SPSR & SPI_SPSR_BITMASK);
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}
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/********************************************************************//**
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* @brief Checks whether the specified SPI Status flag is set or not
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* via inputSPIStatus parameter.
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* @param[in] inputSPIStatus Value to check status of each flag type.
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* This value is the return value from SPI_GetStatus().
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* @param[in] SPIStatus Specifies the SPI status flag to check,
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* should be one of the following:
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- SPI_STAT_ABRT: Slave abort.
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- SPI_STAT_MODF: Mode fault.
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- SPI_STAT_ROVR: Read overrun.
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- SPI_STAT_WCOL: Write collision.
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- SPI_STAT_SPIF: SPI transfer complete.
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* @return The new state of SPIStatus (SET or RESET)
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*********************************************************************/
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FlagStatus SPI_CheckStatus (uint32_t inputSPIStatus, uint8_t SPIStatus)
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{
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CHECK_PARAM(PARAM_SPI_STAT(SPIStatus));
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return ((inputSPIStatus & SPIStatus) ? SET : RESET);
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}
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/**
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* @}
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*/
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#endif /* _SPI */
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/**
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* @}
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*/
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/* --------------------------------- End Of File ------------------------------ */
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