/**************************************************************************** * config/olimex-strp711/src/up_spi.c * * Copyright (C) 2008 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * This logic emulates the Prolific PL2303 serial/USB converter * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include "up_internal.h" #include "up_arch.h" #include "chip.h" #include "str71x_internal.h" #if defined(CONFIG_STR71X_BSPI0) || defined(CONFIG_STR71X_BSPI1) /**************************************************************************** * Definitions ****************************************************************************/ /* Configuration ************************************************************/ #ifndef CONFIG_STR714X_BSPI0_TXFIFO_DEPTH # define CONFIG_STR714X_BSPI0_TXFIFO_DEPTH 8 #endif #ifndef CONFIG_STR714X_BSPI0_RXFIFO_DEPTH # define CONFIG_STR714X_BSPI0_RXFIFO_DEPTH 8 #endif #ifndef CONFIG_STR714X_BSPI1_TXFIFO_DEPTH # define CONFIG_STR714X_BSPI1_TXFIFO_DEPTH 8 #endif #ifndef CONFIG_STR714X_BSPI1_RXFIFO_DEPTH # define CONFIG_STR714X_BSPI1_RXFIFO_DEPTH 8 #endif /**************************************************************************** * On the Olimex-STR-STR-P711, BSPI0 is not connected on board, but is * available on a header for use in the prototyping area. BSPI connects * to the MMC/SD card slot. * * GPIO pin configurations (STR710/STR711,2,5). * BSP0: * PIN NORMAL ALTERNATE Olimex-STR-STR-P711 Connection * 123/52 P0.0 S0.MISO * UEXT-3 (Not connected on board) * 124/53 P0.1 S0.MOSI * UEXT-4 " " " " "" " " * 125/54 P0.2 S0.SCLK * UEXT-5 " " " " "" " " * 126/55 P0.3 ~SO.SS ** UEXT-6 " " " " "" " " * * * Programming the AF function selects UART3 by default. BSPI must be * enabled with the SPI_EN bit in the BOOTCR register * * Programming the AF function selects I2C1 by default. BSPI must be * enabled with the SPI_EN bit in the BOOTCR register * * BSP1 * PIN NORMAL ALTERNATE Olimex-STR-STR-P711 Connection * 127/56 P0.4 S1.MISO SD_CARDBOT DAT0/D0 * 140/60 P0.5 S1.MOSI SD_CARDBOT CMD/DI * 141/61 P0.6 S1.SCLK SD_CARDBOT CLK/SCLK * 142/62 P0.7 ~S1.SS SD_CARDBOT CD/DAT/CS * ****************************************************************************/ #define BSPI0_GPIO0_MISO (0x0001) #define BSPI0_GPIO0_MOSI (0x0002) #define BSPI0_GPIO0_SCLK (0x0004) #define BSPI0_GPIO0_SS (0x0008) #define BSPIO_GPIO0_ALL (0x000f) #define BSPI1_GPIO0_MISO (0x0010) #define BSPI1_GPIO0_MOSI (0x0020) #define BSPI1_GPIO0_SCLK (0x0040) #define BSPI1_GPIO0_SS (0x0080) #define BSPI1_GPIO0_ALL (0x00f0) /* Configuration register settings ******************************************/ #if CONFIG_STR714X_BSPI0_RXFIFO_DEPTH == 1 # define STR71X_BSPI0_CSR1RXFIFODEPTH STR71X_BSPICSR1_RFE1 #elif CONFIG_STR714X_BSPI0_RXFIFO_DEPTH == 2 # define STR71X_BSPI0_CSR1RXFIFODEPTH STR71X_BSPICSR1_RFE12 #elif CONFIG_STR714X_BSPI0_RXFIFO_DEPTH == 3 # define STR71X_BSPI0_CSR1RXFIFODEPTH STR71X_BSPICSR1_RFE13 #elif CONFIG_STR714X_BSPI0_RXFIFO_DEPTH == 4 # define STR71X_BSPI0_CSR1RXFIFODEPTH STR71X_BSPICSR1_RFE14 #elif CONFIG_STR714X_BSPI0_RXFIFO_DEPTH == 5 # define STR71X_BSPI0_CSR1RXFIFODEPTH STR71X_BSPICSR1_RFE15 #elif CONFIG_STR714X_BSPI0_RXFIFO_DEPTH == 6 # define STR71X_BSPI0_CSR1RXFIFODEPTH STR71X_BSPICSR1_RFE16 #elif CONFIG_STR714X_BSPI0_RXFIFO_DEPTH == 7 # define STR71X_BSPI0_CSR1RXFIFODEPTH STR71X_BSPICSR1_RFE17 #elif CONFIG_STR714X_BSPI0_RXFIFO_DEPTH == 8 # define STR71X_BSPI0_CSR1RXFIFODEPTH STR71X_BSPICSR1_RFE18 #elif CONFIG_STR714X_BSPI0_RXFIFO_DEPTH == 9 # define STR71X_BSPI0_CSR1RXFIFODEPTH STR71X_BSPICSR1_RFE19 #elif CONFIG_STR714X_BSPI0_RXFIFO_DEPTH == 10 # define STR71X_BSPI0_CSR1RXFIFODEPTH STR71X_BSPICSR1_RFE110 #else # error "Invaid RX FIFO depth setting" #endif #define STR71X_BSPI0_CSR1DISABLE STR71X_BSPI0_CSR1RXFIFODEPTH #define STR71X_BSPI0_CSR1ENABLE (STR71X_BSPICSR1_BSPE|STR71X_BSPICSR1_MSTR|STR71X_BSPI0_CSR1RXFIFODEPTH) #if CONFIG_STR714X_BSPI0_TXFIFO_DEPTH == 1 # define STR71X_BSPI0_CSR1TXFIFODEPTH STR71X_BSPICSR2_TFE1 #elif CONFIG_STR714X_BSPI0_TXFIFO_DEPTH == 2 # define STR71X_BSPI0_CSR1TXFIFODEPTH STR71X_BSPICSR2_TFE12 #elif CONFIG_STR714X_BSPI0_TXFIFO_DEPTH == 3 # define STR71X_BSPI0_CSR1TXFIFODEPTH STR71X_BSPICSR2_TFE13 #elif CONFIG_STR714X_BSPI0_TXFIFO_DEPTH == 4 # define STR71X_BSPI0_CSR1TXFIFODEPTH STR71X_BSPICSR2_TFE14 #elif CONFIG_STR714X_BSPI0_TXFIFO_DEPTH == 5 # define STR71X_BSPI0_CSR1TXFIFODEPTH STR71X_BSPICSR2_TFE15 #elif CONFIG_STR714X_BSPI0_TXFIFO_DEPTH == 6 # define STR71X_BSPI0_CSR1TXFIFODEPTH STR71X_BSPICSR2_TFE16 #elif CONFIG_STR714X_BSPI0_TXFIFO_DEPTH == 7 # define STR71X_BSPI0_CSR1TXFIFODEPTH STR71X_BSPICSR2_TFE17 #elif CONFIG_STR714X_BSPI0_TXFIFO_DEPTH == 8 # define STR71X_BSPI0_CSR1TXFIFODEPTH STR71X_BSPICSR2_TFE18 #elif CONFIG_STR714X_BSPI0_TXFIFO_DEPTH == 9 # define STR71X_BSPI0_CSR1TXFIFODEPTH STR71X_BSPICSR2_TFE19 #elif CONFIG_STR714X_BSPI0_TXFIFO_DEPTH == 10 # define STR71X_BSPI0_CSR1TXFIFODEPTH STR71X_BSPICSR2_TFE110 #else # error "Invaid TX FIFO depth setting" #endif #define STR71X_BSPI0_CSR2VALUE STR71X_BSPI0_CSR1TXFIFODEPTH #if CONFIG_STR714X_BSPI1_RXFIFO_DEPTH == 1 # define STR71X_BSPI1_CSR1RXFIFODEPTH STR71X_BSPICSR1_RFE1 #elif CONFIG_STR714X_BSPI1_RXFIFO_DEPTH == 2 # define STR71X_BSPI1_CSR1RXFIFODEPTH STR71X_BSPICSR1_RFE12 #elif CONFIG_STR714X_BSPI1_RXFIFO_DEPTH == 3 # define STR71X_BSPI1_CSR1RXFIFODEPTH STR71X_BSPICSR1_RFE13 #elif CONFIG_STR714X_BSPI1_RXFIFO_DEPTH == 4 # define STR71X_BSPI1_CSR1RXFIFODEPTH STR71X_BSPICSR1_RFE14 #elif CONFIG_STR714X_BSPI1_RXFIFO_DEPTH == 5 # define STR71X_BSPI1_CSR1RXFIFODEPTH STR71X_BSPICSR1_RFE15 #elif CONFIG_STR714X_BSPI1_RXFIFO_DEPTH == 6 # define STR71X_BSPI1_CSR1RXFIFODEPTH STR71X_BSPICSR1_RFE16 #elif CONFIG_STR714X_BSPI1_RXFIFO_DEPTH == 7 # define STR71X_BSPI1_CSR1RXFIFODEPTH STR71X_BSPICSR1_RFE17 #elif CONFIG_STR714X_BSPI1_RXFIFO_DEPTH == 8 # define STR71X_BSPI1_CSR1RXFIFODEPTH STR71X_BSPICSR1_RFE18 #elif CONFIG_STR714X_BSPI1_RXFIFO_DEPTH == 9 # define STR71X_BSPI1_CSR1RXFIFODEPTH STR71X_BSPICSR1_RFE19 #elif CONFIG_STR714X_BSPI1_RXFIFO_DEPTH == 10 # define STR71X_BSPI1_CSR1RXFIFODEPTH STR71X_BSPICSR1_RFE110 #else # error "Invaid RX FIFO depth setting" #endif #define STR71X_BSPI1_CSR1DISABLE STR71X_BSPI1_CSR1RXFIFODEPTH #define STR71X_BSPI1_CSR1ENABLE (STR71X_BSPICSR1_BSPE|STR71X_BSPICSR1_MSTR|STR71X_BSPI1_CSR1RXFIFODEPTH) #if CONFIG_STR714X_BSPI1_TXFIFO_DEPTH == 1 # define STR71X_BSPI1_CSR1TXFIFODEPTH STR71X_BSPICSR2_TFE1 #elif CONFIG_STR714X_BSPI1_TXFIFO_DEPTH == 2 # define STR71X_BSPI1_CSR1TXFIFODEPTH STR71X_BSPICSR2_TFE12 #elif CONFIG_STR714X_BSPI1_TXFIFO_DEPTH == 3 # define STR71X_BSPI1_CSR1TXFIFODEPTH STR71X_BSPICSR2_TFE13 #elif CONFIG_STR714X_BSPI1_TXFIFO_DEPTH == 4 # define STR71X_BSPI1_CSR1TXFIFODEPTH STR71X_BSPICSR2_TFE14 #elif CONFIG_STR714X_BSPI1_TXFIFO_DEPTH == 5 # define STR71X_BSPI1_CSR1TXFIFODEPTH STR71X_BSPICSR2_TFE15 #elif CONFIG_STR714X_BSPI1_TXFIFO_DEPTH == 6 # define STR71X_BSPI1_CSR1TXFIFODEPTH STR71X_BSPICSR2_TFE16 #elif CONFIG_STR714X_BSPI1_TXFIFO_DEPTH == 7 # define STR71X_BSPI1_CSR1TXFIFODEPTH STR71X_BSPICSR2_TFE17 #elif CONFIG_STR714X_BSPI1_TXFIFO_DEPTH == 8 # define STR71X_BSPI1_CSR1TXFIFODEPTH STR71X_BSPICSR2_TFE18 #elif CONFIG_STR714X_BSPI1_TXFIFO_DEPTH == 9 # define STR71X_BSPI1_CSR1TXFIFODEPTH STR71X_BSPICSR2_TFE19 #elif CONFIG_STR714X_BSPI1_TXFIFO_DEPTH == 10 # define STR71X_BSPI1_CSR1TXFIFODEPTH STR71X_BSPICSR2_TFE110 #else # error "Invaid TX FIFO depth setting" #endif #define STR71X_BSPI1_CSR2VALUE STR71X_BSPI1_CSR1TXFIFODEPTH /**************************************************************************** * Private Types ****************************************************************************/ struct str71x_spidev_s { struct spi_dev_s spidev; /* Externally visible part of the SPI interface */ uint32 spibase; /* BSPIn base address */ uint16 csbit; /* BSPIn SS bit int GPIO0 */ }; /**************************************************************************** * Private Function Prototypes ****************************************************************************/ /* Helpers */ static inline uint16 spi_getreg(FAR struct str71x_spidev_s *priv, ubyte offset); static inline void spi_putreg(FAR struct str71x_spidev_s *priv, ubyte offset, uint16 value); /* SPI methods */ static void spi_select(FAR struct spi_dev_s *dev, boolean selected); static uint32 spi_setfrequency(FAR struct spi_dev_s *dev, uint32 frequency); static ubyte spi_status(FAR struct spi_dev_s *dev); static ubyte spi_sndbyte(FAR struct spi_dev_s *dev, ubyte ch); static void spi_sndblock(FAR struct spi_dev_s *dev, FAR const ubyte *buffer, size_t buflen); static void spi_recvblock(FAR struct spi_dev_s *dev, FAR ubyte *buffer, size_t buflen); /**************************************************************************** * Private Data ****************************************************************************/ static const struct spi_ops_s g_spiops = { .select = spi_select, .setfrequency = spi_setfrequency, .status = spi_status, .sndbyte = spi_sndbyte, .sndblock = spi_sndblock, .recvblock = spi_recvblock, }; #ifdef CONFIG_STR71X_BSPI0 static struct str71x_spidev_s g_spidev0 = { .spidev = { &g_spiops }, .spibase = STR71X_BSPI0_BASE, .csbit = BSPI0_GPIO0_SS }; #endif #ifdef CONFIG_STR71X_BSPI1 static struct str71x_spidev_s g_spidev1 = { .spidev = { &g_spiops }, .spibase = STR71X_BSPI1_BASE, .csbit = BSPI1_GPIO0_SS }; #endif /**************************************************************************** * Public Data ****************************************************************************/ /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: spi_getreg * * Description: * Get the contents of the SPI register at offset * * Input Parameters: * priv - private SPI device structure * offset - offset to the register of interest * * Returned Value: * The contents of the 16-bit register * ****************************************************************************/ static inline uint16 spi_getreg(FAR struct str71x_spidev_s *priv, ubyte offset) { return getreg16(priv->spibase + offset); } /**************************************************************************** * Name: spi_putreg * * Description: * Write a 16-bit value to the SPI register at offset * * Input Parameters: * priv - private SPI device structure * offset - offset to the register of interest * value - the 16-bit value to be written * * Returned Value: * The contents of the 16-bit register * ****************************************************************************/ static inline void spi_putreg(FAR struct str71x_spidev_s *priv, ubyte offset, uint16 value) { putreg16(value, priv->spibase + offset); } /**************************************************************************** * Name: spi_select * * Description: * Enable/disable the SPI slave select * * Input Parameters: * selected: TRUE: slave selected, FALSE: slave de-selected * * Returned Value: * None * ****************************************************************************/ static void spi_select(FAR struct spi_dev_s *dev, boolean selected) { FAR struct str71x_spidev_s *priv = (FAR struct str71x_spidev_s *)dev; uint16 reg16; DEBUGASSERT(priv && priv->spibase); reg16 = spi_getreg(priv, STR71X_GPIO_PD_OFFSET); if (selected) { /* Enable slave select (low enables) */ reg16 &= ~priv->csbit; spi_putreg(priv, STR71X_GPIO_PD_OFFSET, reg16); } else { /* Disable slave select (low enables) */ reg16 |= priv->csbit; spi_putreg(priv, STR71X_GPIO_PD_OFFSET, reg16); #if CONFIG_STR714X_BSPI0_TXFIFO_DEPTH > 1 /* Wait while the TX FIFO is full */ while ((spi_getreg(priv, STR71X_BSPI_CSR2_OFFSET) & STR71X_BSPICSR2_TFF) != 0); #else /* Wait until the TX FIFO is empty */ while ((spi_getreg(priv, STR71X_BSPI_CSR2_OFFSET) & STR71X_BSPICSR2_TFE) == 0); #endif /* Write 0xff to the TX FIFO */ spi_putreg(priv, STR71X_BSPI_TXR_OFFSET, 0xff00); /* Wait for the TX FIFO empty */ while ((spi_getreg(priv, STR71X_BSPI_CSR2_OFFSET) & STR71X_BSPICSR2_TFNE) != 0); /* Wait for the RX FIFO not empty */ while ((spi_getreg(priv, STR71X_BSPI_CSR2_OFFSET) & STR71X_BSPICSR2_RFNE) == 0); /* Then read and discard bytes until the RX FIFO is empty */ do { (void)spi_getreg(priv, STR71X_BSPI_RXR_OFFSET); } while (spi_getreg(priv, STR71X_BSPI_CSR2_OFFSET & STR71X_BSPICSR2_RFNE) != 0); } } /**************************************************************************** * Name: spi_setfrequency * * Description: * Set the SPI frequency. * * Input Parameters: * frequency: The SPI frequency requested * * Returned Value: * Returns the actual frequency selected * ****************************************************************************/ static uint32 spi_setfrequency(FAR struct spi_dev_s *dev, uint32 frequency) { FAR struct str71x_spidev_s *priv = (FAR struct str71x_spidev_s *)dev; uint32 divisor; uint32 cr1; DEBUGASSERT(priv && priv->spibase); /* The BSPI clock is determined by divider the APB1 clock (PCLK1). * * Eg. PCLK1 = 32MHz, frequency = 20000000: * correct divisor is 2.1, calculated value is 2. */ divisor = (STR71X_PCLK1 + (frequency >> 1)) / frequency; /* The divisor must be an even number and contrained to the range of * 5 (master mode, or 7 for slave mode) and 255. These bits must * be configured BEFORE the BSPE or MSTR bits.. i.e., before the SPI * is put into master mode. */ divisor <<= 1; /* The full, even divisor */ if (divisor < 6) { divisor = 6; } else if (divisor > 254) { divisor = 254; } /* The BSPI must be disable when the following setting is made. */ cr1 = spi_getreg(priv, STR71X_BSPI_CSR1_OFFSET); cr1 &= ~(STR71X_BSPICSR1_BSPE|STR71X_BSPICSR1_MSTR); spi_putreg(priv, STR71X_BSPI_CSR1_OFFSET, cr1); spi_putreg(priv, STR71X_BSPI_CLK_OFFSET, (uint16)divisor); /* Now we can enable the BSP in master mode */ cr1 |= (STR71X_BSPICSR1_BSPE|STR71X_BSPICSR1_MSTR); spi_putreg(priv, STR71X_BSPI_CSR1_OFFSET, cr1); return STR71X_PCLK1 / divisor; } /**************************************************************************** * Name: spi_status * * Description: * Get SPI/MMC status * * Input Parameters: * None * * Returned Value: * Returns a bitset of status values (see SPI_STATUS_* defines * ****************************************************************************/ static ubyte spi_status(FAR struct spi_dev_s *dev) { /* I don't think there is anyway to determine these things on the Olimex * board. */ return SPI_STATUS_PRESENT; } /**************************************************************************** * Name: spi_sndbyte * * Description: * Send one byte on SPI * * Input Parameters: * ch - the byte to send * * Returned Value: * response * ****************************************************************************/ static ubyte spi_sndbyte(FAR struct spi_dev_s *dev, ubyte ch) { FAR struct str71x_spidev_s *priv = (FAR struct str71x_spidev_s *)dev; DEBUGASSERT(priv && priv->spibase); #if CONFIG_STR714X_BSPI0_TXFIFO_DEPTH > 1 /* Wait while the TX FIFO is full */ while ((spi_getreg(priv, STR71X_BSPI_CSR2_OFFSET) & STR71X_BSPICSR2_TFF) != 0); #else /* Wait until the TX FIFO is empty */ while ((spi_getreg(priv, STR71X_BSPI_CSR2_OFFSET) & STR71X_BSPICSR2_TFE) == 0); #endif /* Write the byte to the TX FIFO */ spi_putreg(priv, STR71X_BSPI_TXR_OFFSET, (uint16)ch << 8); /* Wait for the RX FIFO not empty */ while ((spi_getreg(priv, STR71X_BSPI_CSR2_OFFSET) & STR71X_BSPICSR2_RFNE) == 0); /* Get the received value from the RX FIFO and return it */ return (ubyte)(spi_getreg(priv, STR71X_BSPI_RXR_OFFSET) >> 8); } /************************************************************************* * Name: spi_sndblock * * Description: * Send a block of data on SPI * * Input Parameters: * buffer - A pointer to the buffer of data to be sent * buflen - the length of data to send from the buffer * * Returned Value: * None * ****************************************************************************/ static void spi_sndblock(FAR struct spi_dev_s *dev, FAR const ubyte *buffer, size_t buflen) { FAR struct str71x_spidev_s *priv = (FAR struct str71x_spidev_s *)dev; uint16 csr2; DEBUGASSERT(priv && priv->spibase); /* Loop while thre are bytes remaining to be sent */ while (buflen > 0) { /* While the TX FIFO is not full and there are bytes left to send */ while ((spi_getreg(priv, STR71X_BSPI_CSR2_OFFSET) & STR71X_BSPICSR2_TFF) == 0 && buflen > 0) { /* Send the data */ spi_putreg(priv, STR71X_BSPI_TXR_OFFSET, ((uint16)*buffer) << 8); buffer++; buflen--; } } /* Then discard all card responses until the RX & TX FIFOs are emptied. */ do { /* Is there anything in the RX fifo? */ csr2 = spi_getreg(priv, STR71X_BSPI_CSR2_OFFSET); if ((csr2 & STR71X_BSPICSR2_RFNE) != 0) { /* Yes.. Read and discard */ (void)spi_getreg(priv, STR71X_BSPI_RXR_OFFSET); } /* There is a race condition where TFNE may go FALSE just before * RFNE goes TRUE and this loop terminates prematurely. The nasty little * delay in the following solves that (it could probably be tuned to * improve performance). */ else if ((csr2 & STR71X_BSPICSR2_TFNE) != 0) { up_udelay(100); csr2 = spi_getreg(priv, STR71X_BSPI_CSR2_OFFSET); } } while ((csr2 & STR71X_BSPICSR2_RFNE) != 0 || (csr2 & STR71X_BSPICSR2_TFNE) == 0); } /**************************************************************************** * Name: spi_recvblock * * Description: * Revice a block of data from SPI * * Input Parameters: * buffer - A pointer to the buffer in which to recieve data * buflen - the length of data that can be received in the buffer * * Returned Value: * None * ****************************************************************************/ static void spi_recvblock(FAR struct spi_dev_s *dev, FAR ubyte *buffer, size_t buflen) { FAR struct str71x_spidev_s *priv = (FAR struct str71x_spidev_s *)dev; uint32 fifobytes = 0; DEBUGASSERT(priv && priv->spibase); /* While there is remaining to be sent (and no synchronization error has occurred) */ while (buflen || fifobytes) { /* Fill the transmit FIFO with 0xff... * Write 0xff to the data register while (1) the TX FIFO is * not full, (2) we have not exceeded the depth of the TX FIFO, * and (3) there are more bytes to be sent. */ while ((spi_getreg(priv, STR71X_BSPI_CSR2_OFFSET) & STR71X_BSPICSR2_TFF) == 0 && (fifobytes < CONFIG_STR714X_BSPI0_TXFIFO_DEPTH) && buflen > 0) { spi_putreg(priv, STR71X_BSPI_TXR_OFFSET, 0xff00); buflen--; fifobytes++; } /* Now, read the RX data from the RX FIFO while the RX FIFO is not empty */ while ((spi_getreg(priv, STR71X_BSPI_CSR2_OFFSET) & STR71X_BSPICSR2_RFNE) != 0) { *buffer++ = (ubyte)(spi_getreg(priv, STR71X_BSPI_RXR_OFFSET) >> 8); fifobytes--; } } } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: up_spiinitialize * * Description: * Initialize the selected SPI port * * Input Parameter: * Port number (for hardware that has mutiple SPI interfaces) * * Returned Value: * Valid SPI device structre reference on succcess; a NULL on failure * ****************************************************************************/ FAR struct spi_dev_s *up_spiinitialize(int port) { FAR struct spi_dev_s *ret; uint16 reg16; #ifdef CONFIG_STR71X_BSPI0 if (port == 0) { /* The default, alternate functionality of the GPIO0 pin selections is * UART3/I2C1. In order to have BSP0 functionality, we also have to * set the BSPI0 enable bit in the PCU BOOTCR register. */ reg16 = getreg16(STR71X_PCU_BOOTCR); reg16 |= STR71X_PCUBOOTCR_BSPIOEN; /* Configure all GPIO pins to their alternate function EXCEPT * for the SS pin .. will will configure that as an output * and control the chip select as a normal GPIO. */ reg16 = getreg16(STR71X_GPIO0_PC0); reg16 |= BSPIO_GPIO0_ALL; putreg16(reg16, STR71X_GPIO0_PC0); reg16 = getreg16(STR71X_GPIO0_PC1); reg16 |= BSPIO_GPIO0_ALL; reg16 &= ~BSPI0_GPIO0_SS; putreg16(reg16, STR71X_GPIO0_PC1); reg16 = getreg16(STR71X_GPIO0_PC2); reg16 |= BSPIO_GPIO0_ALL; putreg16(reg16, STR71X_GPIO0_PC2); /* Start with chip slave disabled */ reg16 = getreg16(STR71X_GPIO0_PD); reg16 |= BSPI0_GPIO0_SS; putreg16(reg16, STR71X_GPIO0_PD); /* Set the clock divider to the maximum */ putreg16(255, STR71X_BSPI1_CLK); /* Set FIFO sizes and disable the BSP1. It won't be enabled * until the frequency is set. */ putreg16(STR71X_BSPI0_CSR1DISABLE, STR71X_BSPI0_CSR1); putreg16(STR71X_BSPI0_CSR2VALUE, STR71X_BSPI0_CSR2); ret = &g_spidev0.spidev; } else #endif #ifdef CONFIG_STR71X_BSPI1 if (port == 1) { /* Configure all GPIO pins to their alternate function EXCEPT * for the SS pin .. will will configure that as an output * and control the chip select as a normal GPIO. */ reg16 = getreg16(STR71X_GPIO0_PC0); reg16 |= BSPI1_GPIO0_ALL; putreg16(reg16, STR71X_GPIO0_PC0); reg16 = getreg16(STR71X_GPIO0_PC1); reg16 |= BSPI1_GPIO0_ALL; reg16 &= ~BSPI1_GPIO0_SS; putreg16(reg16, STR71X_GPIO0_PC1); reg16 = getreg16(STR71X_GPIO0_PC2); reg16 |= BSPI1_GPIO0_ALL; putreg16(reg16, STR71X_GPIO0_PC2); /* Start with chip slave disabled */ reg16 = getreg16(STR71X_GPIO0_PD); reg16 |= BSPI1_GPIO0_SS; putreg16(reg16, STR71X_GPIO0_PD); /* Set the clock divider to the maximum */ putreg16(255, STR71X_BSPI1_CLK); /* Set FIFO sizes and disable the BSP1. It won't be enabled * until the frequency is set. */ putreg16(STR71X_BSPI1_CSR1DISABLE, STR71X_BSPI1_CSR1); putreg16(STR71X_BSPI1_CSR2VALUE, STR71X_BSPI1_CSR2); ret = &g_spidev1.spidev; } else #endif { ret = NULL; } return ret; } #endif /* CONFIG_STR71X_BSPI0 || CONFIG_STR71X_BSPI1 */