Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

targets/hal/TARGET_Maxim/TARGET_MAX32610/spi_api.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
144:ef7eb2e8f9f7
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /*******************************************************************************
bogdanm 0:9b334a45a8ff 2 * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved.
bogdanm 0:9b334a45a8ff 3 *
bogdanm 0:9b334a45a8ff 4 * Permission is hereby granted, free of charge, to any person obtaining a
bogdanm 0:9b334a45a8ff 5 * copy of this software and associated documentation files (the "Software"),
bogdanm 0:9b334a45a8ff 6 * to deal in the Software without restriction, including without limitation
bogdanm 0:9b334a45a8ff 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
bogdanm 0:9b334a45a8ff 8 * and/or sell copies of the Software, and to permit persons to whom the
bogdanm 0:9b334a45a8ff 9 * Software is furnished to do so, subject to the following conditions:
bogdanm 0:9b334a45a8ff 10 *
bogdanm 0:9b334a45a8ff 11 * The above copyright notice and this permission notice shall be included
bogdanm 0:9b334a45a8ff 12 * in all copies or substantial portions of the Software.
bogdanm 0:9b334a45a8ff 13 *
bogdanm 0:9b334a45a8ff 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
bogdanm 0:9b334a45a8ff 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
bogdanm 0:9b334a45a8ff 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
bogdanm 0:9b334a45a8ff 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
bogdanm 0:9b334a45a8ff 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
bogdanm 0:9b334a45a8ff 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
bogdanm 0:9b334a45a8ff 20 * OTHER DEALINGS IN THE SOFTWARE.
bogdanm 0:9b334a45a8ff 21 *
bogdanm 0:9b334a45a8ff 22 * Except as contained in this notice, the name of Maxim Integrated
bogdanm 0:9b334a45a8ff 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
bogdanm 0:9b334a45a8ff 24 * Products, Inc. Branding Policy.
bogdanm 0:9b334a45a8ff 25 *
bogdanm 0:9b334a45a8ff 26 * The mere transfer of this software does not imply any licenses
bogdanm 0:9b334a45a8ff 27 * of trade secrets, proprietary technology, copyrights, patents,
bogdanm 0:9b334a45a8ff 28 * trademarks, maskwork rights, or any other form of intellectual
bogdanm 0:9b334a45a8ff 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
bogdanm 0:9b334a45a8ff 30 * ownership rights.
bogdanm 0:9b334a45a8ff 31 *******************************************************************************
bogdanm 0:9b334a45a8ff 32 */
bogdanm 0:9b334a45a8ff 33
bogdanm 0:9b334a45a8ff 34 #include <string.h>
bogdanm 0:9b334a45a8ff 35 #include "mbed_assert.h"
bogdanm 0:9b334a45a8ff 36 #include "cmsis.h"
bogdanm 0:9b334a45a8ff 37 #include "spi_api.h"
bogdanm 0:9b334a45a8ff 38 #include "pinmap.h"
bogdanm 0:9b334a45a8ff 39 #include "ioman_regs.h"
bogdanm 0:9b334a45a8ff 40 #include "clkman_regs.h"
bogdanm 0:9b334a45a8ff 41 #include "PeripheralPins.h"
bogdanm 0:9b334a45a8ff 42
bogdanm 0:9b334a45a8ff 43 #define DEFAULT_CHAR 8
bogdanm 0:9b334a45a8ff 44 #define DEFAULT_MODE 0
bogdanm 0:9b334a45a8ff 45 #define DEFAULT_FREQ 1000000
bogdanm 0:9b334a45a8ff 46
bogdanm 0:9b334a45a8ff 47 // Formatting settings
bogdanm 0:9b334a45a8ff 48 static int spi_bits;
bogdanm 0:9b334a45a8ff 49
bogdanm 0:9b334a45a8ff 50 //******************************************************************************
bogdanm 0:9b334a45a8ff 51 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
bogdanm 0:9b334a45a8ff 52 {
bogdanm 0:9b334a45a8ff 53 // Make sure pins are pointing to the same SPI instance
bogdanm 0:9b334a45a8ff 54 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
bogdanm 0:9b334a45a8ff 55 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
bogdanm 0:9b334a45a8ff 56 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
bogdanm 0:9b334a45a8ff 57 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
bogdanm 0:9b334a45a8ff 58
bogdanm 0:9b334a45a8ff 59 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
bogdanm 0:9b334a45a8ff 60 SPIName spi_cntl;
bogdanm 0:9b334a45a8ff 61
bogdanm 0:9b334a45a8ff 62 // Give the application the option to manually control Slave Select
bogdanm 0:9b334a45a8ff 63 if((SPIName)spi_ssel != (SPIName)NC) {
bogdanm 0:9b334a45a8ff 64 spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
bogdanm 0:9b334a45a8ff 65 } else {
bogdanm 0:9b334a45a8ff 66 spi_cntl = spi_sclk;
bogdanm 0:9b334a45a8ff 67 }
bogdanm 0:9b334a45a8ff 68
bogdanm 0:9b334a45a8ff 69 SPIName spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
bogdanm 0:9b334a45a8ff 70
bogdanm 0:9b334a45a8ff 71 MBED_ASSERT((SPIName)spi != (SPIName)NC);
bogdanm 0:9b334a45a8ff 72
bogdanm 0:9b334a45a8ff 73 // Set the obj pointer to the proper SPI Instance
bogdanm 0:9b334a45a8ff 74 obj->spi = (mxc_spi_regs_t*)spi;
bogdanm 0:9b334a45a8ff 75
bogdanm 0:9b334a45a8ff 76 // Set the SPI index and FIFOs
bogdanm 0:9b334a45a8ff 77 obj->index = MXC_SPI_BASE_TO_INSTANCE(obj->spi);
bogdanm 0:9b334a45a8ff 78 obj->rxfifo = MXC_SPI_GET_RXFIFO(obj->index);
bogdanm 0:9b334a45a8ff 79 obj->txfifo = MXC_SPI_GET_TXFIFO(obj->index);
bogdanm 0:9b334a45a8ff 80
bogdanm 0:9b334a45a8ff 81 // Configure the pins
bogdanm 0:9b334a45a8ff 82 pinmap_pinout(mosi, PinMap_SPI_MOSI);
bogdanm 0:9b334a45a8ff 83 pinmap_pinout(miso, PinMap_SPI_MISO);
bogdanm 0:9b334a45a8ff 84 pinmap_pinout(sclk, PinMap_SPI_SCLK);
bogdanm 0:9b334a45a8ff 85 pinmap_pinout(ssel, PinMap_SPI_SSEL);
bogdanm 0:9b334a45a8ff 86
bogdanm 0:9b334a45a8ff 87 // Enable SPI and FIFOs
bogdanm 0:9b334a45a8ff 88 obj->spi->gen_ctrl = (MXC_F_SPI_GEN_CTRL_SPI_MSTR_EN |
bogdanm 0:9b334a45a8ff 89 MXC_F_SPI_GEN_CTRL_TX_FIFO_EN |
bogdanm 0:9b334a45a8ff 90 MXC_F_SPI_GEN_CTRL_RX_FIFO_EN );
bogdanm 0:9b334a45a8ff 91 }
bogdanm 0:9b334a45a8ff 92
bogdanm 0:9b334a45a8ff 93 //******************************************************************************
bogdanm 0:9b334a45a8ff 94 void spi_format(spi_t *obj, int bits, int mode, int slave)
bogdanm 0:9b334a45a8ff 95 {
bogdanm 0:9b334a45a8ff 96 // Check the validity of the inputs
bogdanm 0:9b334a45a8ff 97 MBED_ASSERT(((bits >= 1) && (bits <= 32)) && ((mode >= 0) && (mode <= 3)));
bogdanm 0:9b334a45a8ff 98
bogdanm 0:9b334a45a8ff 99 // Only supports master mode
bogdanm 0:9b334a45a8ff 100 MBED_ASSERT(!slave);
bogdanm 0:9b334a45a8ff 101
bogdanm 0:9b334a45a8ff 102 // Save formatting data
bogdanm 0:9b334a45a8ff 103 spi_bits = bits;
bogdanm 0:9b334a45a8ff 104
bogdanm 0:9b334a45a8ff 105 // Set the mode
bogdanm 0:9b334a45a8ff 106 obj->spi->mstr_cfg &= ~(MXC_F_SPI_MSTR_CFG_SPI_MODE);
bogdanm 0:9b334a45a8ff 107 obj->spi->mstr_cfg |= (mode << MXC_F_SPI_MSTR_CFG_SPI_MODE_POS);
bogdanm 0:9b334a45a8ff 108 }
bogdanm 0:9b334a45a8ff 109
bogdanm 0:9b334a45a8ff 110 //******************************************************************************
bogdanm 0:9b334a45a8ff 111 void spi_frequency(spi_t *obj, int hz)
bogdanm 0:9b334a45a8ff 112 {
bogdanm 0:9b334a45a8ff 113 // Maximum frequency is half the system frequency
bogdanm 0:9b334a45a8ff 114 MBED_ASSERT((unsigned int)hz <= (SystemCoreClock / 2));
bogdanm 0:9b334a45a8ff 115 unsigned clocks = ((SystemCoreClock/2)/(hz));
bogdanm 0:9b334a45a8ff 116
bogdanm 0:9b334a45a8ff 117 // Figure out the divider ratio
bogdanm 0:9b334a45a8ff 118 int clk_div = 1;
bogdanm 0:9b334a45a8ff 119 while(clk_div < 10) {
bogdanm 0:9b334a45a8ff 120 if(clocks < 0x10) {
bogdanm 0:9b334a45a8ff 121 break;
bogdanm 0:9b334a45a8ff 122 }
bogdanm 0:9b334a45a8ff 123 clk_div++;
bogdanm 0:9b334a45a8ff 124 clocks = clocks >> 1;
bogdanm 0:9b334a45a8ff 125 }
bogdanm 0:9b334a45a8ff 126
bogdanm 0:9b334a45a8ff 127 // Turn on the SPI clock
bogdanm 0:9b334a45a8ff 128 if(obj->index == 0) {
bogdanm 0:9b334a45a8ff 129 MXC_CLKMAN->clk_ctrl_3_spi0 = clk_div;
bogdanm 0:9b334a45a8ff 130 } else if(obj->index == 1) {
bogdanm 0:9b334a45a8ff 131 MXC_CLKMAN->clk_ctrl_4_spi1 = clk_div;
bogdanm 0:9b334a45a8ff 132 } else if(obj->index == 2) {
bogdanm 0:9b334a45a8ff 133 MXC_CLKMAN->clk_ctrl_5_spi2 = clk_div;
bogdanm 0:9b334a45a8ff 134 } else {
bogdanm 0:9b334a45a8ff 135 MBED_ASSERT(0);
bogdanm 0:9b334a45a8ff 136 }
bogdanm 0:9b334a45a8ff 137
bogdanm 0:9b334a45a8ff 138 // Set the number of clocks to hold sclk high and low
bogdanm 0:9b334a45a8ff 139 MXC_SET_FIELD(&obj->spi->mstr_cfg, (MXC_F_SPI_MSTR_CFG_SCK_HI_CLK | MXC_F_SPI_MSTR_CFG_SCK_LO_CLK),
bogdanm 0:9b334a45a8ff 140 ((clocks << MXC_F_SPI_MSTR_CFG_SCK_HI_CLK_POS) | (clocks << MXC_F_SPI_MSTR_CFG_SCK_LO_CLK_POS)));
bogdanm 0:9b334a45a8ff 141 }
bogdanm 0:9b334a45a8ff 142
bogdanm 0:9b334a45a8ff 143 //******************************************************************************
bogdanm 0:9b334a45a8ff 144 int spi_master_write(spi_t *obj, int value)
bogdanm 0:9b334a45a8ff 145 {
bogdanm 0:9b334a45a8ff 146 int bits = spi_bits;
bogdanm 0:9b334a45a8ff 147 if(spi_bits == 32) {
bogdanm 0:9b334a45a8ff 148 bits = 0;
bogdanm 0:9b334a45a8ff 149 }
bogdanm 0:9b334a45a8ff 150 // Create the header
bogdanm 0:9b334a45a8ff 151 uint16_t header = ((0x3 << MXC_F_SPI_FIFO_DIR_POS ) | // TX and RX
bogdanm 0:9b334a45a8ff 152 (0x0 << MXC_F_SPI_FIFO_UNIT_POS) | // Send bits
bogdanm 0:9b334a45a8ff 153 (bits << MXC_F_SPI_FIFO_SIZE_POS) | // Number of units
bogdanm 0:9b334a45a8ff 154 (0x1 << MXC_F_SPI_FIFO_DASS_POS)); // Deassert SS
bogdanm 0:9b334a45a8ff 155
bogdanm 0:9b334a45a8ff 156 // Send the message header
bogdanm 0:9b334a45a8ff 157 obj->txfifo->txfifo_16 = header;
bogdanm 0:9b334a45a8ff 158
bogdanm 0:9b334a45a8ff 159 // Send the data
bogdanm 0:9b334a45a8ff 160 if(spi_bits < 17) {
bogdanm 0:9b334a45a8ff 161 obj->txfifo->txfifo_16 = (uint16_t)value;
bogdanm 0:9b334a45a8ff 162 } else {
bogdanm 0:9b334a45a8ff 163 obj->txfifo->txfifo_32 = (uint32_t)value;
bogdanm 0:9b334a45a8ff 164 }
bogdanm 0:9b334a45a8ff 165
bogdanm 0:9b334a45a8ff 166 // Get the data
bogdanm 0:9b334a45a8ff 167 bits = spi_bits;
bogdanm 0:9b334a45a8ff 168 int result = 0;
bogdanm 0:9b334a45a8ff 169 int i = 0;
bogdanm 0:9b334a45a8ff 170 while(bits > 0) {
bogdanm 0:9b334a45a8ff 171 // Wait for data
bogdanm 0:9b334a45a8ff 172 while(((obj->spi->fifo_ctrl & MXC_F_SPI_FIFO_CTRL_RX_FIFO_USED)
bogdanm 0:9b334a45a8ff 173 >> MXC_F_SPI_FIFO_CTRL_RX_FIFO_USED_POS) < 1) {}
bogdanm 0:9b334a45a8ff 174
bogdanm 0:9b334a45a8ff 175 result |= (obj->rxfifo->rxfifo_8 << (i++*8));
bogdanm 0:9b334a45a8ff 176 bits-=8;
bogdanm 0:9b334a45a8ff 177 }
bogdanm 0:9b334a45a8ff 178
bogdanm 0:9b334a45a8ff 179 return result;
bogdanm 0:9b334a45a8ff 180 }
bogdanm 0:9b334a45a8ff 181
bogdanm 0:9b334a45a8ff 182 //******************************************************************************
bogdanm 0:9b334a45a8ff 183 int spi_busy(spi_t *obj)
bogdanm 0:9b334a45a8ff 184 {
bogdanm 0:9b334a45a8ff 185 return !(obj->spi->intfl & MXC_F_SPI_INTFL_TX_READY);
bogdanm 0:9b334a45a8ff 186 }