diff options
Diffstat (limited to 'tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Maxim/TARGET_MAX32600/spi_api.c')
| -rw-r--r-- | tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Maxim/TARGET_MAX32600/spi_api.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Maxim/TARGET_MAX32600/spi_api.c b/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Maxim/TARGET_MAX32600/spi_api.c new file mode 100644 index 0000000000..0dda7cdd0c --- /dev/null +++ b/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Maxim/TARGET_MAX32600/spi_api.c @@ -0,0 +1,190 @@ +/******************************************************************************* + * 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); +} |