Ermanno Brusadin / mbed

mbed library sources

Dependents:   FRDM-KL46Z_LCD_Test FRDM-KL46Z_LCD_Test FRDM-KL46Z_Plantilla FRDM-KL46Z_Plantilla ... more

targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/spi_api.c@0:6bc4ac881c8e, 2016-07-28 (annotated)

Committer:
ebrus
Date:
Thu Jul 28 15:56:34 2016 +0000
Revision:
0:6bc4ac881c8e
1;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ebrus 0:6bc4ac881c8e 1 /* mbed Microcontroller Library
ebrus 0:6bc4ac881c8e 2 * Copyright (c) 2013 ARM Limited
ebrus 0:6bc4ac881c8e 3 *
ebrus 0:6bc4ac881c8e 4 * Licensed under the Apache License, Version 2.0 (the "License");
ebrus 0:6bc4ac881c8e 5 * you may not use this file except in compliance with the License.
ebrus 0:6bc4ac881c8e 6 * You may obtain a copy of the License at
ebrus 0:6bc4ac881c8e 7 *
ebrus 0:6bc4ac881c8e 8 * http://www.apache.org/licenses/LICENSE-2.0
ebrus 0:6bc4ac881c8e 9 *
ebrus 0:6bc4ac881c8e 10 * Unless required by applicable law or agreed to in writing, software
ebrus 0:6bc4ac881c8e 11 * distributed under the License is distributed on an "AS IS" BASIS,
ebrus 0:6bc4ac881c8e 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
ebrus 0:6bc4ac881c8e 13 * See the License for the specific language governing permissions and
ebrus 0:6bc4ac881c8e 14 * limitations under the License.
ebrus 0:6bc4ac881c8e 15 */
ebrus 0:6bc4ac881c8e 16 #include <math.h>
ebrus 0:6bc4ac881c8e 17 #include "mbed_assert.h"
ebrus 0:6bc4ac881c8e 18
ebrus 0:6bc4ac881c8e 19 #include "spi_api.h"
ebrus 0:6bc4ac881c8e 20
ebrus 0:6bc4ac881c8e 21 #if DEVICE_SPI
ebrus 0:6bc4ac881c8e 22
ebrus 0:6bc4ac881c8e 23 #include "cmsis.h"
ebrus 0:6bc4ac881c8e 24 #include "pinmap.h"
ebrus 0:6bc4ac881c8e 25 #include "mbed_error.h"
ebrus 0:6bc4ac881c8e 26 #include "fsl_clock_manager.h"
ebrus 0:6bc4ac881c8e 27 #include "fsl_dspi_hal.h"
ebrus 0:6bc4ac881c8e 28 #include "PeripheralPins.h"
ebrus 0:6bc4ac881c8e 29
ebrus 0:6bc4ac881c8e 30 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
ebrus 0:6bc4ac881c8e 31 // determine the SPI to use
ebrus 0:6bc4ac881c8e 32 uint32_t spi_mosi = pinmap_peripheral(mosi, PinMap_SPI_MOSI);
ebrus 0:6bc4ac881c8e 33 uint32_t spi_miso = pinmap_peripheral(miso, PinMap_SPI_MISO);
ebrus 0:6bc4ac881c8e 34 uint32_t spi_sclk = pinmap_peripheral(sclk, PinMap_SPI_SCLK);
ebrus 0:6bc4ac881c8e 35 uint32_t spi_ssel = pinmap_peripheral(ssel, PinMap_SPI_SSEL);
ebrus 0:6bc4ac881c8e 36 uint32_t spi_data = pinmap_merge(spi_mosi, spi_miso);
ebrus 0:6bc4ac881c8e 37 uint32_t spi_cntl = pinmap_merge(spi_sclk, spi_ssel);
ebrus 0:6bc4ac881c8e 38
ebrus 0:6bc4ac881c8e 39 obj->instance = pinmap_merge(spi_data, spi_cntl);
ebrus 0:6bc4ac881c8e 40 MBED_ASSERT((int)obj->instance != NC);
ebrus 0:6bc4ac881c8e 41
ebrus 0:6bc4ac881c8e 42 CLOCK_SYS_EnableSpiClock(obj->instance);
ebrus 0:6bc4ac881c8e 43 uint32_t spi_address[] = SPI_BASE_ADDRS;
ebrus 0:6bc4ac881c8e 44 DSPI_HAL_Init(spi_address[obj->instance]);
ebrus 0:6bc4ac881c8e 45 DSPI_HAL_Disable(spi_address[obj->instance]);
ebrus 0:6bc4ac881c8e 46 // set default format and frequency
ebrus 0:6bc4ac881c8e 47 if (ssel == NC) {
ebrus 0:6bc4ac881c8e 48 spi_format(obj, 8, 0, 0); // 8 bits, mode 0, master
ebrus 0:6bc4ac881c8e 49 } else {
ebrus 0:6bc4ac881c8e 50 spi_format(obj, 8, 0, 1); // 8 bits, mode 0, slave
ebrus 0:6bc4ac881c8e 51 }
ebrus 0:6bc4ac881c8e 52 DSPI_HAL_SetDelay(spi_address[obj->instance], kDspiCtar0, 0, 0, kDspiPcsToSck);
ebrus 0:6bc4ac881c8e 53 spi_frequency(obj, 1000000);
ebrus 0:6bc4ac881c8e 54
ebrus 0:6bc4ac881c8e 55 DSPI_HAL_Enable(spi_address[obj->instance]);
ebrus 0:6bc4ac881c8e 56 DSPI_HAL_StartTransfer(spi_address[obj->instance]);
ebrus 0:6bc4ac881c8e 57
ebrus 0:6bc4ac881c8e 58 // pin out the spi pins
ebrus 0:6bc4ac881c8e 59 pinmap_pinout(mosi, PinMap_SPI_MOSI);
ebrus 0:6bc4ac881c8e 60 pinmap_pinout(miso, PinMap_SPI_MISO);
ebrus 0:6bc4ac881c8e 61 pinmap_pinout(sclk, PinMap_SPI_SCLK);
ebrus 0:6bc4ac881c8e 62 if (ssel != NC) {
ebrus 0:6bc4ac881c8e 63 pinmap_pinout(ssel, PinMap_SPI_SSEL);
ebrus 0:6bc4ac881c8e 64 }
ebrus 0:6bc4ac881c8e 65 }
ebrus 0:6bc4ac881c8e 66
ebrus 0:6bc4ac881c8e 67 void spi_free(spi_t *obj) {
ebrus 0:6bc4ac881c8e 68 // [TODO]
ebrus 0:6bc4ac881c8e 69 }
ebrus 0:6bc4ac881c8e 70 void spi_format(spi_t *obj, int bits, int mode, int slave) {
ebrus 0:6bc4ac881c8e 71 dspi_data_format_config_t config = {0};
ebrus 0:6bc4ac881c8e 72 config.bitsPerFrame = (uint32_t)bits;
ebrus 0:6bc4ac881c8e 73 config.clkPolarity = (mode & 0x2) ? kDspiClockPolarity_ActiveLow : kDspiClockPolarity_ActiveHigh;
ebrus 0:6bc4ac881c8e 74 config.clkPhase = (mode & 0x1) ? kDspiClockPhase_SecondEdge : kDspiClockPhase_FirstEdge;
ebrus 0:6bc4ac881c8e 75 config.direction = kDspiMsbFirst;
ebrus 0:6bc4ac881c8e 76 uint32_t spi_address[] = SPI_BASE_ADDRS;
ebrus 0:6bc4ac881c8e 77 dspi_status_t result = DSPI_HAL_SetDataFormat(spi_address[obj->instance], kDspiCtar0, &config);
ebrus 0:6bc4ac881c8e 78 if (result != kStatus_DSPI_Success) {
ebrus 0:6bc4ac881c8e 79 error("Failed to configure SPI data format");
ebrus 0:6bc4ac881c8e 80 }
ebrus 0:6bc4ac881c8e 81
ebrus 0:6bc4ac881c8e 82 if (slave) {
ebrus 0:6bc4ac881c8e 83 DSPI_HAL_SetMasterSlaveMode(spi_address[obj->instance], kDspiSlave);
ebrus 0:6bc4ac881c8e 84 } else {
ebrus 0:6bc4ac881c8e 85 DSPI_HAL_SetMasterSlaveMode(spi_address[obj->instance], kDspiMaster);
ebrus 0:6bc4ac881c8e 86 }
ebrus 0:6bc4ac881c8e 87 }
ebrus 0:6bc4ac881c8e 88
ebrus 0:6bc4ac881c8e 89 void spi_frequency(spi_t *obj, int hz) {
ebrus 0:6bc4ac881c8e 90 uint32_t busClock;
ebrus 0:6bc4ac881c8e 91 CLOCK_SYS_GetFreq(kBusClock, &busClock);
ebrus 0:6bc4ac881c8e 92 uint32_t spi_address[] = SPI_BASE_ADDRS;
ebrus 0:6bc4ac881c8e 93 DSPI_HAL_SetBaudRate(spi_address[obj->instance], kDspiCtar0, (uint32_t)hz, busClock);
ebrus 0:6bc4ac881c8e 94 }
ebrus 0:6bc4ac881c8e 95
ebrus 0:6bc4ac881c8e 96 static inline int spi_writeable(spi_t * obj) {
ebrus 0:6bc4ac881c8e 97 uint32_t spi_address[] = SPI_BASE_ADDRS;
ebrus 0:6bc4ac881c8e 98 return DSPI_HAL_GetStatusFlag(spi_address[obj->instance], kDspiTxFifoFillRequest);
ebrus 0:6bc4ac881c8e 99 }
ebrus 0:6bc4ac881c8e 100
ebrus 0:6bc4ac881c8e 101 static inline int spi_readable(spi_t * obj) {
ebrus 0:6bc4ac881c8e 102 uint32_t spi_address[] = SPI_BASE_ADDRS;
ebrus 0:6bc4ac881c8e 103 return DSPI_HAL_GetStatusFlag(spi_address[obj->instance], kDspiRxFifoDrainRequest);
ebrus 0:6bc4ac881c8e 104 }
ebrus 0:6bc4ac881c8e 105
ebrus 0:6bc4ac881c8e 106 int spi_master_write(spi_t *obj, int value) {
ebrus 0:6bc4ac881c8e 107 uint32_t spi_address[] = SPI_BASE_ADDRS;
ebrus 0:6bc4ac881c8e 108
ebrus 0:6bc4ac881c8e 109 // wait tx buffer empty
ebrus 0:6bc4ac881c8e 110 while(!spi_writeable(obj));
ebrus 0:6bc4ac881c8e 111 dspi_command_config_t command = {0};
ebrus 0:6bc4ac881c8e 112 command.isEndOfQueue = true;
ebrus 0:6bc4ac881c8e 113 command.isChipSelectContinuous = 0;
ebrus 0:6bc4ac881c8e 114 DSPI_HAL_WriteDataMastermode(spi_address[obj->instance], &command, (uint16_t)value);
ebrus 0:6bc4ac881c8e 115 DSPI_HAL_ClearStatusFlag(spi_address[obj->instance], kDspiTxFifoFillRequest);
ebrus 0:6bc4ac881c8e 116
ebrus 0:6bc4ac881c8e 117 // wait rx buffer full
ebrus 0:6bc4ac881c8e 118 while (!spi_readable(obj));
ebrus 0:6bc4ac881c8e 119 DSPI_HAL_ClearStatusFlag(spi_address[obj->instance], kDspiRxFifoDrainRequest);
ebrus 0:6bc4ac881c8e 120 return DSPI_HAL_ReadData(spi_address[obj->instance]) & 0xff;
ebrus 0:6bc4ac881c8e 121 }
ebrus 0:6bc4ac881c8e 122
ebrus 0:6bc4ac881c8e 123 int spi_slave_receive(spi_t *obj) {
ebrus 0:6bc4ac881c8e 124 return spi_readable(obj);
ebrus 0:6bc4ac881c8e 125 }
ebrus 0:6bc4ac881c8e 126
ebrus 0:6bc4ac881c8e 127 int spi_slave_read(spi_t *obj) {
ebrus 0:6bc4ac881c8e 128 DSPI_HAL_ClearStatusFlag(obj->instance, kDspiRxFifoDrainRequest);
ebrus 0:6bc4ac881c8e 129 uint32_t spi_address[] = SPI_BASE_ADDRS;
ebrus 0:6bc4ac881c8e 130 return DSPI_HAL_ReadData(spi_address[obj->instance]);
ebrus 0:6bc4ac881c8e 131 }
ebrus 0:6bc4ac881c8e 132
ebrus 0:6bc4ac881c8e 133 void spi_slave_write(spi_t *obj, int value) {
ebrus 0:6bc4ac881c8e 134 while (!spi_writeable(obj));
ebrus 0:6bc4ac881c8e 135 uint32_t spi_address[] = SPI_BASE_ADDRS;
ebrus 0:6bc4ac881c8e 136 DSPI_HAL_WriteDataSlavemode(spi_address[obj->instance], (uint32_t)value);
ebrus 0:6bc4ac881c8e 137 }
ebrus 0:6bc4ac881c8e 138
ebrus 0:6bc4ac881c8e 139 #endif