/* mbed Microcontroller Library * Copyright (c) 2013 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include <math.h> #include "mbed_assert.h" #include "spi_api.h" #if DEVICE_SPI #include "cmsis.h" #include "pinmap.h" #include "mbed_error.h" #include "fsl_spi.h" #include "PeripheralPins.h" /* Array of SPI peripheral base address. */ static SPI_Type *const spi_address[] = SPI_BASE_PTRS; void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) { // determine the SPI to use uint32_t spi_mosi = pinmap_peripheral(mosi, PinMap_SPI_MOSI); uint32_t spi_miso = pinmap_peripheral(miso, PinMap_SPI_MISO); uint32_t spi_sclk = pinmap_peripheral(sclk, PinMap_SPI_SCLK); uint32_t spi_ssel = pinmap_peripheral(ssel, PinMap_SPI_SSEL); uint32_t spi_data = pinmap_merge(spi_mosi, spi_miso); uint32_t spi_cntl = pinmap_merge(spi_sclk, spi_ssel); obj->instance = pinmap_merge(spi_data, spi_cntl); MBED_ASSERT((int)obj->instance != NC); // pin out the spi pins pinmap_pinout(mosi, PinMap_SPI_MOSI); pinmap_pinout(miso, PinMap_SPI_MISO); pinmap_pinout(sclk, PinMap_SPI_SCLK); if (ssel != NC) { pinmap_pinout(ssel, PinMap_SPI_SSEL); } } void spi_free(spi_t *obj) { SPI_Deinit(spi_address[obj->instance]); } void spi_format(spi_t *obj, int bits, int mode, int slave) { spi_master_config_t master_config; spi_slave_config_t slave_config; /* Bits: values between 4 and 16 are valid */ MBED_ASSERT(bits >= 4 && bits <= 16); obj->bits = bits; if (slave) { /* Slave config */ SPI_SlaveGetDefaultConfig(&slave_config); slave_config.dataWidth = (uint32_t)bits - 1; slave_config.polarity = (mode & 0x2) ? kSPI_ClockPolarityActiveLow : kSPI_ClockPolarityActiveHigh; slave_config.phase = (mode & 0x1) ? kSPI_ClockPhaseSecondEdge : kSPI_ClockPhaseFirstEdge; SPI_SlaveInit(spi_address[obj->instance], &slave_config); } else { /* Master config */ SPI_MasterGetDefaultConfig(&master_config); master_config.dataWidth = (uint32_t)bits - 1; master_config.polarity = (mode & 0x2) ? kSPI_ClockPolarityActiveLow : kSPI_ClockPolarityActiveHigh; master_config.phase = (mode & 0x1) ? kSPI_ClockPhaseSecondEdge : kSPI_ClockPhaseFirstEdge; master_config.direction = kSPI_MsbFirst; switch (obj->instance) { case 0: CLOCK_AttachClk(kFRO12M_to_FLEXCOMM0); RESET_PeripheralReset(kFC0_RST_SHIFT_RSTn); break; case 1: CLOCK_AttachClk(kFRO12M_to_FLEXCOMM1); RESET_PeripheralReset(kFC1_RST_SHIFT_RSTn); break; case 2: CLOCK_AttachClk(kFRO12M_to_FLEXCOMM2); RESET_PeripheralReset(kFC2_RST_SHIFT_RSTn); break; case 3: CLOCK_AttachClk(kFRO12M_to_FLEXCOMM3); RESET_PeripheralReset(kFC3_RST_SHIFT_RSTn); break; case 4: CLOCK_AttachClk(kFRO12M_to_FLEXCOMM4); RESET_PeripheralReset(kFC4_RST_SHIFT_RSTn); break; case 5: CLOCK_AttachClk(kFRO12M_to_FLEXCOMM5); RESET_PeripheralReset(kFC5_RST_SHIFT_RSTn); break; case 6: CLOCK_AttachClk(kFRO12M_to_FLEXCOMM6); RESET_PeripheralReset(kFC6_RST_SHIFT_RSTn); break; case 7: CLOCK_AttachClk(kFRO12M_to_FLEXCOMM7); RESET_PeripheralReset(kFC7_RST_SHIFT_RSTn); break; } SPI_MasterInit(spi_address[obj->instance], &master_config, 12000000); } } void spi_frequency(spi_t *obj, int hz) { SPI_MasterSetBaud(spi_address[obj->instance], (uint32_t)hz, 12000000); } static inline int spi_readable(spi_t * obj) { return (SPI_GetStatusFlags(spi_address[obj->instance]) & kSPI_RxNotEmptyFlag); } int spi_master_write(spi_t *obj, int value) { uint32_t rx_data; SPI_WriteData(spi_address[obj->instance], (uint16_t)value, kSPI_FrameAssert); // wait rx buffer full while (!spi_readable(obj)); rx_data = SPI_ReadData(spi_address[obj->instance]); return rx_data & 0xffff; } int spi_master_block_write(spi_t *obj, const char *tx_buffer, int tx_length, char *rx_buffer, int rx_length) { int total = (tx_length > rx_length) ? tx_length : rx_length; for (int i = 0; i < total; i++) { char out = (i < tx_length) ? tx_buffer[i] : 0xff; char in = spi_master_write(obj, out); if (i < rx_length) { rx_buffer[i] = in; } } return total; } int spi_slave_receive(spi_t *obj) { return spi_readable(obj); } int spi_slave_read(spi_t *obj) { uint32_t rx_data; while (!spi_readable(obj)); rx_data = SPI_ReadData(spi_address[obj->instance]); return rx_data & 0xffff; } void spi_slave_write(spi_t *obj, int value) { SPI_WriteData(spi_address[obj->instance], (uint16_t)value, 0); } #endif