Add simple SPI-based MMC/SD block driver
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1043 42af7a65-404d-4744-a932-0658087f49c3
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patacongo
parent
2763245a98
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3bef2ecbf7
@ -87,13 +87,12 @@
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* Private Function Prototypes
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****************************************************************************/
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static void spi_select(boolean select);
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static uint32 spi_setfrequency(uint32 frequency);
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static ubyte spi_status(void);
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static void spi_sndbyte(ubyte ch);
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static int spi_waitready(void);
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static void spi_sndblock(FAR const ubyte *data, int datlen);
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static void spi_recvblock(FAR ubyte *data, int datlen);
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static void spi_select(FAR struct spi_dev_s *dev, boolean selected);
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static uint32 spi_setfrequency(FAR struct spi_dev_s *dev, uint32 frequency);
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static ubyte spi_status(FAR struct spi_dev_s *dev);
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static ubyte spi_sndbyte(FAR struct spi_dev_s *dev, ubyte ch);
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static void spi_sndblock(FAR struct spi_dev_s *dev, FAR const ubyte *buffer, size_t buflen);
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static void spi_recvblock(FAR struct spi_dev_s *dev, FAR ubyte *buffer, size_t buflen);
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/****************************************************************************
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* Private Data
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@ -105,11 +104,12 @@ static const struct spi_ops_s g_spiops =
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.setfrequency = spi_setfrequency,
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.status = spi_status,
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.sndbyte = spi_sndbyte,
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.waitready = spi_waitready,
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.sndblock = spi_sndblock,
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.recvblock = spi_recvblock,
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};
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static struct spi_dev_s g_spidev = { &g_spiops };
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/****************************************************************************
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* Public Data
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****************************************************************************/
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@ -125,18 +125,18 @@ static const struct spi_ops_s g_spiops =
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* Enable/disable the SPI chip select
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*
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* Input Parameters:
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* select: TRUE: chip selected, FALSE: chip de-selected
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* selected: TRUE: chip selected, FALSE: chip de-selected
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void spi_select(boolean select)
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void spi_select(FAR struct spi_dev_s *dev, boolean selected)
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{
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uint32 bit = 1 << 20;
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if (select)
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if (selected)
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{
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/* Enable chip select (low enables) */
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@ -180,7 +180,7 @@ void spi_select(boolean select)
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*
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****************************************************************************/
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uint32 spi_setfrequency(uint32 frequency)
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uint32 spi_setfrequency(FAR struct spi_dev_s *dev, uint32 frequency)
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{
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uint32 divisor = LPC214X_PCLKFREQ / frequency;
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@ -212,7 +212,7 @@ uint32 spi_setfrequency(uint32 frequency)
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*
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****************************************************************************/
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ubyte spi_status(void)
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ubyte spi_status(FAR struct spi_dev_s *dev)
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{
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/* I don't think there is anyway to determine these things on the mcu123.com
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* board.
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@ -231,17 +231,17 @@ ubyte spi_status(void)
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* ch - the byte to send
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*
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* Returned Value:
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* None
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* response
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*
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****************************************************************************/
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void spi_sndbyte(ubyte ch)
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ubyte spi_sndbyte(FAR struct spi_dev_s *dev, ubyte ch)
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{
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/* Wait while the TX FIFO is full */
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while (!(getreg8(LPC214X_SPI1_SR) & LPC214X_SPI1SR_TNF));
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/* Send the byte */
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/* Write the byte to the TX FIFO */
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putreg16(ch, LPC214X_SPI1_DR);
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@ -249,45 +249,9 @@ void spi_sndbyte(ubyte ch)
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while (!(getreg8(LPC214X_SPI1_SR) & LPC214X_SPI1SR_RNE));
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/* Get the value from the RX FIFO */
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/* Get the value from the RX FIFO and return it */
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(void)getreg16(LPC214X_SPI1_DR);
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}
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/****************************************************************************
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* Name: spi_waitready
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*
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* Description:
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* Wait for SPI to be ready
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*
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* Input Parameters: None
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*
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* Returned Value:
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* OK if no error occured; a negated errno otherwise.
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*
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****************************************************************************/
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int spi_waitready(void)
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{
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ubyte ret;
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do
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{
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/* Write 0xff to the data register */
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putreg16(0xff, LPC214X_SPI1_DR);
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/* Wait until the controller reports RX FIFO not empty */
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while (!(getreg8(LPC214X_SPI1_SR) & LPC214X_SPI1SR_RNE));
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/* Check by reading back the from the RX FIFO */
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ret = (ubyte)getreg16(LPC214X_SPI1_DR);
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}
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while (ret != 0xff);
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return OK;
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return (ubyte)getreg16(LPC214X_SPI1_DR);
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}
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/*************************************************************************
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@ -297,39 +261,42 @@ int spi_waitready(void)
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* Send a block of data on SPI
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*
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* Input Parameters:
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* data - A pointer to the buffer of data to be sent
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* datlen - the length of data to send from the buffer
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* buffer - A pointer to the buffer of data to be sent
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* buflen - the length of data to send from the buffer
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void spi_sndblock(FAR const ubyte *data, int datlen)
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void spi_sndblock(FAR struct spi_dev_s *dev, FAR const ubyte *buffer, size_t buflen)
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{
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/* Loop while thre are bytes remaining to be sent */
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while (datlen > 0)
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while (buflen > 0)
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{
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/* While the TX FIFO is not full and there are bytes left to send */
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while ((getreg8(LPC214X_SPI1_SR) & LPC214X_SPI1SR_TNF) && datlen)
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while ((getreg8(LPC214X_SPI1_SR) & LPC214X_SPI1SR_TNF) && buflen)
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{
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/* Send the data */
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putreg16((uint16)*data, LPC214X_SPI1_DR);
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data++;
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datlen--;
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putreg16((uint16)*buffer, LPC214X_SPI1_DR);
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buffer++;
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buflen--;
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}
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}
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/* Then read from the FIFO while the RX FIFO is not empty or the TX FIFO
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* is not empty.
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/* Then read from the RX FIFO while the RX FIFO is not empty or the TX FIFO
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* is not empty. We should get the same number of bytes in response as were
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* sent.
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*/
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while ((getreg8(LPC214X_SPI1_SR) & LPC214X_SPI1SR_RNE) ||
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!(getreg8(LPC214X_SPI1_SR) & LPC214X_SPI1SR_TFE))
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{
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/* Read and discard */
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(void)getreg16(LPC214X_SPI1_DR);
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}
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}
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@ -341,21 +308,21 @@ void spi_sndblock(FAR const ubyte *data, int datlen)
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* Revice a block of data from SPI
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*
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* Input Parameters:
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* data - A pointer to the buffer in which to recieve data
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* datlen - the length of data that can be received in the buffer
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* buffer - A pointer to the buffer in which to recieve data
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* buflen - the length of data that can be received in the buffer
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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static void spi_recvblock(FAR ubyte *data, int datlen)
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static void spi_recvblock(FAR struct spi_dev_s *dev, FAR ubyte *buffer, size_t buflen)
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{
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uint32 fifobytes = 0;
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/* While there is remaining to be sent (and no error has occurred */
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/* While there is remaining to be sent (and no synchronization error has occurred) */
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while (datlen || fifobytes)
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while (buflen || fifobytes)
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{
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/* Fill the transmit FIFO with 0xff...
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* Write 0xff to the data register while (1) the TX FIFO is
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@ -364,19 +331,19 @@ static void spi_recvblock(FAR ubyte *data, int datlen)
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*/
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while ((getreg8(LPC214X_SPI1_SR) & LPC214X_SPI1SR_TNF) &&
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(fifobytes < LPC214X_SPI1_FIFOSZ) && datlen)
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(fifobytes < LPC214X_SPI1_FIFOSZ) && buflen)
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{
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putreg16(0xff, LPC214X_SPI1_DR);
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--datlen;
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++fifobytes;
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buflen--;
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fifobytes++;
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}
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/* Now, read the RX data from the FIFO while the RX FIFO is not empty */
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/* Now, read the RX data from the RX FIFO while the RX FIFO is not empty */
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while (getreg8(LPC214X_SPI1_SR) & LPC214X_SPI1SR_RNE)
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{
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*data++ = (ubyte)getreg16(LPC214X_SPI1_DR);
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--fifobytes;
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*buffer++ = (ubyte)getreg16(LPC214X_SPI1_DR);
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fifobytes--;
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}
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}
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}
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@ -395,11 +362,11 @@ static void spi_recvblock(FAR ubyte *data, int datlen)
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* Port number (for hardware that has mutiple SPI interfaces)
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*
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* Returned Value:
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* Valid vtable pointer on succcess; NULL on failure
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* Valid SPI device structre reference on succcess; a NULL on failure
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*
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****************************************************************************/
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FAR const struct spi_ops_s *up_spiinitialize(int port)
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FAR struct spi_dev_s *up_spiinitialize(int port)
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{
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uint32 regval32;
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ubyte regval8;
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@ -453,7 +420,7 @@ FAR const struct spi_ops_s *up_spiinitialize(int port)
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/* Set the initial clock frequency for indentification mode < 400kHz */
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spi_setfrequency(400000);
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spi_setfrequency(NULL, 400000);
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/* Enable the SPI */
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@ -465,5 +432,5 @@ FAR const struct spi_ops_s *up_spiinitialize(int port)
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(void)getreg16(LPC214X_SPI1_DR);
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}
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return &g_spiops;
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return &g_spidev;
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}
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