+++ /dev/null
-/*******************************************************************************
- * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
- * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
- * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
- * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
- * OTHER DEALINGS IN THE SOFTWARE.
- *
- * Except as contained in this notice, the name of Maxim Integrated
- * Products, Inc. shall not be used except as stated in the Maxim Integrated
- * Products, Inc. Branding Policy.
- *
- * The mere transfer of this software does not imply any licenses
- * of trade secrets, proprietary technology, copyrights, patents,
- * trademarks, maskwork rights, or any other form of intellectual
- * property whatsoever. Maxim Integrated Products, Inc. retains all
- * ownership rights.
- *******************************************************************************
- */
-
-#include <string.h>
-#include "mbed_assert.h"
-#include "cmsis.h"
-#include "spi_api.h"
-#include "pinmap.h"
-#include "ioman_regs.h"
-#include "clkman_regs.h"
-#include "PeripheralPins.h"
-
-#define DEFAULT_CHAR 8
-#define DEFAULT_MODE 0
-#define DEFAULT_FREQ 1000000
-
-// Formatting settings
-static int spi_bits;
-
-//******************************************************************************
-void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
-{
- // Make sure pins are pointing to the same SPI instance
- SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
- SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
- SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
- SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
-
- SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
- SPIName spi_cntl;
-
- // Give the application the option to manually control Slave Select
- if((SPIName)spi_ssel != (SPIName)NC) {
- spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
- } else {
- spi_cntl = spi_sclk;
- }
-
- SPIName spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
-
- MBED_ASSERT((SPIName)spi != (SPIName)NC);
-
- // Set the obj pointer to the proper SPI Instance
- obj->spi = (mxc_spi_regs_t*)spi;
-
- // Set the SPI index and FIFOs
- obj->index = MXC_SPI_BASE_TO_INSTANCE(obj->spi);
- obj->rxfifo = MXC_SPI_GET_RXFIFO(obj->index);
- obj->txfifo = MXC_SPI_GET_TXFIFO(obj->index);
-
- // Configure the pins
- pinmap_pinout(mosi, PinMap_SPI_MOSI);
- pinmap_pinout(miso, PinMap_SPI_MISO);
- pinmap_pinout(sclk, PinMap_SPI_SCLK);
- pinmap_pinout(ssel, PinMap_SPI_SSEL);
-
- // Enable SPI and FIFOs
- obj->spi->gen_ctrl = (MXC_F_SPI_GEN_CTRL_SPI_MSTR_EN |
- MXC_F_SPI_GEN_CTRL_TX_FIFO_EN |
- MXC_F_SPI_GEN_CTRL_RX_FIFO_EN );
-
- // Give instance the default settings
- spi_format(obj, DEFAULT_CHAR, DEFAULT_MODE, 0);
- spi_frequency(obj, DEFAULT_FREQ);
-}
-
-//******************************************************************************
-void spi_format(spi_t *obj, int bits, int mode, int slave)
-{
- // Check the validity of the inputs
- MBED_ASSERT(((bits >= 1) && (bits <= 32)) && ((mode >= 0) && (mode <= 3)));
-
- // Only supports master mode
- MBED_ASSERT(!slave);
-
- // Save formatting data
- spi_bits = bits;
-
- // Set the mode
- obj->spi->mstr_cfg &= ~(MXC_F_SPI_MSTR_CFG_SPI_MODE);
- obj->spi->mstr_cfg |= (mode << MXC_F_SPI_MSTR_CFG_SPI_MODE_POS);
-}
-
-//******************************************************************************
-void spi_frequency(spi_t *obj, int hz)
-{
- // Maximum frequency is half the system frequency
- MBED_ASSERT((unsigned int)hz < (SystemCoreClock / 2));
- unsigned clocks = ((SystemCoreClock/2)/(hz));
-
- // Figure out the divider ratio
- int clk_div = 1;
- while(clk_div < 10) {
- if(clocks < 0x10) {
- break;
- }
- clk_div++;
- clocks = clocks >> 1;
- }
-
- // Turn on the SPI clock
- if(obj->index == 0) {
- MXC_CLKMAN->clk_ctrl_3_spi0 = clk_div;
- } else if(obj->index == 1) {
- MXC_CLKMAN->clk_ctrl_4_spi1 = clk_div;
- } else if(obj->index == 2) {
- MXC_CLKMAN->clk_ctrl_5_spi2 = clk_div;
- } else {
- MBED_ASSERT(0);
- }
-
- // Set the number of clocks to hold sclk high and low
- MXC_SET_FIELD(&obj->spi->mstr_cfg, (MXC_F_SPI_MSTR_CFG_SCK_HI_CLK | MXC_F_SPI_MSTR_CFG_SCK_LO_CLK),
- ((clocks << MXC_F_SPI_MSTR_CFG_SCK_HI_CLK_POS) | (clocks << MXC_F_SPI_MSTR_CFG_SCK_LO_CLK_POS)));
-}
-
-//******************************************************************************
-int spi_master_write(spi_t *obj, int value)
-{
- int bits = spi_bits;
- if(spi_bits == 32) {
- bits = 0;
- }
- // Create the header
- uint16_t header = ((0x3 << MXC_F_SPI_FIFO_DIR_POS ) | // TX and RX
- (0x0 << MXC_F_SPI_FIFO_UNIT_POS) | // Send bits
- (bits << MXC_F_SPI_FIFO_SIZE_POS) | // Number of units
- (0x1 << MXC_F_SPI_FIFO_DASS_POS)); // Deassert SS
-
- // Send the message header
- obj->txfifo->txfifo_16 = header;
-
- // Send the data
- if(spi_bits < 17) {
- obj->txfifo->txfifo_16 = (uint16_t)value;
- } else {
- obj->txfifo->txfifo_32 = (uint32_t)value;
- }
-
- // Get the data
- bits = spi_bits;
- int result = 0;
- int i = 0;
- while(bits > 0) {
- // Wait for data
- while(((obj->spi->fifo_ctrl & MXC_F_SPI_FIFO_CTRL_RX_FIFO_USED)
- >> MXC_F_SPI_FIFO_CTRL_RX_FIFO_USED_POS) < 1) {}
-
- result |= (obj->rxfifo->rxfifo_8 << (i++*8));
- bits-=8;
- }
-
- return result;
-}
-
-//******************************************************************************
-int spi_busy(spi_t *obj)
-{
- return !(obj->spi->intfl & MXC_F_SPI_INTFL_TX_READY);
-}
projects / qmk_firmware.git / blobdiff