tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/spi_api.c

   1 /* mbed Microcontroller Library
   2  * Copyright (c) 2013 ARM Limited
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 #include <math.h>
  17 #include "mbed_assert.h"
  18
  19 #include "spi_api.h"
  20
  21 #if DEVICE_SPI
  22
  23 #include "cmsis.h"
  24 #include "pinmap.h"
  25 #include "mbed_error.h"
  26 #include "fsl_clock_manager.h"
  27 #include "fsl_dspi_hal.h"
  28 #include "PeripheralPins.h"
  29
  30 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
  31     // determine the SPI to use
  32     uint32_t spi_mosi = pinmap_peripheral(mosi, PinMap_SPI_MOSI);
  33     uint32_t spi_miso = pinmap_peripheral(miso, PinMap_SPI_MISO);
  34     uint32_t spi_sclk = pinmap_peripheral(sclk, PinMap_SPI_SCLK);
  35     uint32_t spi_ssel = pinmap_peripheral(ssel, PinMap_SPI_SSEL);
  36     uint32_t spi_data = pinmap_merge(spi_mosi, spi_miso);
  37     uint32_t spi_cntl = pinmap_merge(spi_sclk, spi_ssel);
  38
  39     obj->instance = pinmap_merge(spi_data, spi_cntl);
  40     MBED_ASSERT((int)obj->instance != NC);
  41
  42     CLOCK_SYS_EnableSpiClock(obj->instance);
  43     uint32_t spi_address[] = SPI_BASE_ADDRS;
  44     DSPI_HAL_Init(spi_address[obj->instance]);
  45     DSPI_HAL_Disable(spi_address[obj->instance]);
  46     // set default format and frequency
  47     if (ssel == NC) {
  48         spi_format(obj, 8, 0, 0);  // 8 bits, mode 0, master
  49     } else {
  50         spi_format(obj, 8, 0, 1);  // 8 bits, mode 0, slave
  51     }
  52     DSPI_HAL_SetDelay(spi_address[obj->instance], kDspiCtar0, 0, 0, kDspiPcsToSck);
  53     spi_frequency(obj, 1000000);
  54
  55     DSPI_HAL_Enable(spi_address[obj->instance]);
  56     DSPI_HAL_StartTransfer(spi_address[obj->instance]);
  57
  58     // pin out the spi pins
  59     pinmap_pinout(mosi, PinMap_SPI_MOSI);
  60     pinmap_pinout(miso, PinMap_SPI_MISO);
  61     pinmap_pinout(sclk, PinMap_SPI_SCLK);
  62     if (ssel != NC) {
  63         pinmap_pinout(ssel, PinMap_SPI_SSEL);
  64     }
  65 }
  66
  67 void spi_free(spi_t *obj) {
  68     // [TODO]
  69 }
  70 void spi_format(spi_t *obj, int bits, int mode, int slave) {
  71     dspi_data_format_config_t config = {0};
  72     config.bitsPerFrame = (uint32_t)bits;
  73     config.clkPolarity = (mode & 0x2) ? kDspiClockPolarity_ActiveLow : kDspiClockPolarity_ActiveHigh;
  74     config.clkPhase = (mode & 0x1) ? kDspiClockPhase_SecondEdge : kDspiClockPhase_FirstEdge;
  75     config.direction = kDspiMsbFirst;
  76     uint32_t spi_address[] = SPI_BASE_ADDRS;
  77     dspi_status_t result = DSPI_HAL_SetDataFormat(spi_address[obj->instance], kDspiCtar0, &config);
  78     if (result != kStatus_DSPI_Success) {
  79         error("Failed to configure SPI data format");
  80     }
  81
  82     if (slave) {
  83         DSPI_HAL_SetMasterSlaveMode(spi_address[obj->instance], kDspiSlave);
  84     } else {
  85         DSPI_HAL_SetMasterSlaveMode(spi_address[obj->instance], kDspiMaster);
  86     }
  87 }
  88
  89 void spi_frequency(spi_t *obj, int hz) {
  90     uint32_t busClock;
  91     CLOCK_SYS_GetFreq(kBusClock, &busClock);
  92     uint32_t spi_address[] = SPI_BASE_ADDRS;
  93     DSPI_HAL_SetBaudRate(spi_address[obj->instance], kDspiCtar0, (uint32_t)hz, busClock);
  94 }
  95
  96 static inline int spi_writeable(spi_t * obj) {
  97     uint32_t spi_address[] = SPI_BASE_ADDRS;
  98     return DSPI_HAL_GetStatusFlag(spi_address[obj->instance], kDspiTxFifoFillRequest);
  99 }
 100
 101 static inline int spi_readable(spi_t * obj) {
 102     uint32_t spi_address[] = SPI_BASE_ADDRS;
 103     return DSPI_HAL_GetStatusFlag(spi_address[obj->instance], kDspiRxFifoDrainRequest);
 104 }
 105
 106 int spi_master_write(spi_t *obj, int value) {
 107     uint32_t spi_address[] = SPI_BASE_ADDRS;
 108
 109     // wait tx buffer empty
 110     while(!spi_writeable(obj));
 111     dspi_command_config_t command = {0};
 112     command.isEndOfQueue = true;
 113     command.isChipSelectContinuous = 0;
 114     DSPI_HAL_WriteDataMastermode(spi_address[obj->instance], &command, (uint16_t)value);
 115     DSPI_HAL_ClearStatusFlag(spi_address[obj->instance], kDspiTxFifoFillRequest);
 116
 117     // wait rx buffer full
 118     while (!spi_readable(obj));
 119     DSPI_HAL_ClearStatusFlag(spi_address[obj->instance], kDspiRxFifoDrainRequest);
 120     return DSPI_HAL_ReadData(spi_address[obj->instance]) & 0xff;
 121 }
 122
 123 int spi_slave_receive(spi_t *obj) {
 124     return spi_readable(obj);
 125 }
 126
 127 int spi_slave_read(spi_t *obj) {
 128     DSPI_HAL_ClearStatusFlag(obj->instance, kDspiRxFifoDrainRequest);
 129     uint32_t spi_address[] = SPI_BASE_ADDRS;
 130     return DSPI_HAL_ReadData(spi_address[obj->instance]);
 131 }
 132
 133 void spi_slave_write(spi_t *obj, int value) {
 134     while (!spi_writeable(obj));
 135     uint32_t spi_address[] = SPI_BASE_ADDRS;
 136     DSPI_HAL_WriteDataSlavemode(spi_address[obj->instance], (uint32_t)value);
 137 }
 138
 139 #endif