2014-12-28 06:29:08 -08:00
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/******************************************************************************
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* The MIT License
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*
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2015-06-13 15:14:51 -07:00
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* Copyright (c) 2011, 2012 LeafLabs, LLC.
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2014-12-28 06:29:08 -08:00
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* Copyright (c) 2010 Perry Hung.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*****************************************************************************/
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/**
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2015-06-13 15:14:51 -07:00
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* @file libmaple/spi.c
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2014-12-28 06:29:08 -08:00
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* @author Marti Bolivar <mbolivar@leaflabs.com>
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* @brief Serial Peripheral Interface (SPI) support.
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* Currently, there is no Integrated Interchip Sound (I2S) support.
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*/
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2015-06-13 15:14:51 -07:00
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#include <libmaple/spi.h>
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#include <libmaple/bitband.h>
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2014-12-28 06:29:08 -08:00
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static void spi_reconfigure(spi_dev *dev, uint32 cr1_config);
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/*
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* SPI convenience routines
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*/
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/**
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* @brief Initialize and reset a SPI device.
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* @param dev Device to initialize and reset.
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*/
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void spi_init(spi_dev *dev) {
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rcc_clk_enable(dev->clk_id);
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rcc_reset_dev(dev->clk_id);
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}
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/**
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* @brief Configure and enable a SPI device as bus master.
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*
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* The device's peripheral will be disabled before being reconfigured.
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*
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* @param dev Device to configure as bus master
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* @param baud Bus baud rate
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* @param mode SPI mode
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* @param flags Logical OR of spi_cfg_flag values.
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* @see spi_cfg_flag
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*/
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void spi_master_enable(spi_dev *dev,
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spi_baud_rate baud,
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spi_mode mode,
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uint32 flags) {
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spi_reconfigure(dev, baud | flags | SPI_CR1_MSTR | mode);
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}
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/**
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* @brief Configure and enable a SPI device as a bus slave.
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*
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* The device's peripheral will be disabled before being reconfigured.
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*
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* @param dev Device to configure as a bus slave
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* @param mode SPI mode
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* @param flags Logical OR of spi_cfg_flag values.
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* @see spi_cfg_flag
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*/
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void spi_slave_enable(spi_dev *dev, spi_mode mode, uint32 flags) {
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spi_reconfigure(dev, flags | mode);
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}
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/**
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2017-05-10 15:57:08 -07:00
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* @brief Blocking SPI transmit.
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2014-12-28 06:29:08 -08:00
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* @param dev SPI port to use for transmission
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* @param buf Buffer to transmit. The sizeof buf's elements are
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* inferred from dev's data frame format (i.e., are
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* correctly treated as 8-bit or 16-bit quantities).
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* @param len Maximum number of elements to transmit.
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*/
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2017-05-10 15:57:08 -07:00
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void spi_tx(spi_dev *dev, void *buf, uint32 len)
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{
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spi_reg_map *regs = dev->regs;
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if ( spi_dff(dev) == SPI_DFF_8_BIT ) {
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uint8 * dp8 = (uint8*)buf;
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while ( len-- ) {
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while ( (regs->SR & SPI_SR_TXE)==0 ) ; //while ( spi_is_tx_empty(dev)==0 ); // wait Tx to be empty
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regs->DR = *dp8++;
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}
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} else {
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uint16 * dp16 = (uint16*)buf;
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while ( len-- ) {
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while ( (regs->SR & SPI_SR_TXE)==0 ) ; //while ( spi_is_tx_empty(dev)==0 ); // wait Tx to be empty
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regs->DR = *dp16++;
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}
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}
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2014-12-28 06:29:08 -08:00
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}
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/**
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* @brief Enable a SPI peripheral
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* @param dev Device to enable
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*/
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void spi_peripheral_enable(spi_dev *dev) {
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bb_peri_set_bit(&dev->regs->CR1, SPI_CR1_SPE_BIT, 1);
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}
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/**
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* @brief Disable a SPI peripheral
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* @param dev Device to disable
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*/
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void spi_peripheral_disable(spi_dev *dev) {
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bb_peri_set_bit(&dev->regs->CR1, SPI_CR1_SPE_BIT, 0);
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}
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/**
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* @brief Enable DMA requests whenever the transmit buffer is empty
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* @param dev SPI device on which to enable TX DMA requests
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*/
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void spi_tx_dma_enable(spi_dev *dev) {
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bb_peri_set_bit(&dev->regs->CR2, SPI_CR2_TXDMAEN_BIT, 1);
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}
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/**
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* @brief Disable DMA requests whenever the transmit buffer is empty
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* @param dev SPI device on which to disable TX DMA requests
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*/
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void spi_tx_dma_disable(spi_dev *dev) {
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bb_peri_set_bit(&dev->regs->CR2, SPI_CR2_TXDMAEN_BIT, 0);
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}
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/**
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* @brief Enable DMA requests whenever the receive buffer is empty
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* @param dev SPI device on which to enable RX DMA requests
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*/
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void spi_rx_dma_enable(spi_dev *dev) {
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bb_peri_set_bit(&dev->regs->CR2, SPI_CR2_RXDMAEN_BIT, 1);
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}
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/**
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* @brief Disable DMA requests whenever the receive buffer is empty
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* @param dev SPI device on which to disable RX DMA requests
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*/
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void spi_rx_dma_disable(spi_dev *dev) {
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bb_peri_set_bit(&dev->regs->CR2, SPI_CR2_RXDMAEN_BIT, 0);
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}
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/*
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* SPI auxiliary routines
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*/
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static void spi_reconfigure(spi_dev *dev, uint32 cr1_config) {
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2017-05-10 15:57:08 -07:00
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#define MASK (SPI_CR1_CRCEN|SPI_CR1_DFF)
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spi_irq_disable(dev, SPI_INTERRUPTS_ALL);
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if ( (dev->regs->CR1&MASK)!=(cr1_config&MASK) ) spi_peripheral_disable(dev);
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dev->regs->CR1 = cr1_config;
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spi_peripheral_enable(dev);
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2014-12-28 06:29:08 -08:00
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}
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