1 /* mbed Microcontroller Library
2 * Copyright (c) 2013 ARM Limited
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #include "mbed_assert.h"
25 #include "mbed_error.h"
26 #include "fsl_clock_manager.h"
27 #include "fsl_dspi_hal.h"
28 #include "PeripheralPins.h"
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);
39 obj->instance = pinmap_merge(spi_data, spi_cntl);
40 MBED_ASSERT((int)obj->instance != NC);
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
48 spi_format(obj, 8, 0, 0); // 8 bits, mode 0, master
50 spi_format(obj, 8, 0, 1); // 8 bits, mode 0, slave
52 DSPI_HAL_SetDelay(spi_address[obj->instance], kDspiCtar0, 0, 0, kDspiPcsToSck);
53 spi_frequency(obj, 1000000);
55 DSPI_HAL_Enable(spi_address[obj->instance]);
56 DSPI_HAL_StartTransfer(spi_address[obj->instance]);
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);
63 pinmap_pinout(ssel, PinMap_SPI_SSEL);
67 void spi_free(spi_t *obj) {
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");
83 DSPI_HAL_SetMasterSlaveMode(spi_address[obj->instance], kDspiSlave);
85 DSPI_HAL_SetMasterSlaveMode(spi_address[obj->instance], kDspiMaster);
89 void spi_frequency(spi_t *obj, int hz) {
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);
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);
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);
106 int spi_master_write(spi_t *obj, int value) {
107 uint32_t spi_address[] = SPI_BASE_ADDRS;
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);
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;
123 int spi_slave_receive(spi_t *obj) {
124 return spi_readable(obj);
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]);
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);