MK22: driver for SPI peripherals
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Silvano Seva
parent
4c952e047b
commit
ae0a467d2a
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@ -250,6 +250,7 @@ mk22fn512_src = ['platform/mcu/MK22FN512xxx12/boot/startup.cpp',
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'platform/mcu/MK22FN512xxx12/drivers/usb/usb_device_khci.c',
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'platform/mcu/MK22FN512xxx12/drivers/usb/usb_osa_bm.c',
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'platform/mcu/MK22FN512xxx12/drivers/usb_vcom.c',
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'platform/drivers/SPI/spi_mk22.c',
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'platform/mcu/CMSIS/Device/NXP/MK22FN512xxx12/Source/system_MK22F51212.c']
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mk22fn512_inc = ['platform/mcu/CMSIS/Include',
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@ -0,0 +1,151 @@
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/***************************************************************************
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* Copyright (C) 2021 - 2024 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#include <errno.h>
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#include <MK22F51212.h>
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#include "spi_mk22.h"
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static inline uint8_t spi_sendRecv(SPI_Type *spi, const uint8_t val)
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{
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spi->MCR &= ~SPI_MCR_HALT_MASK; // Start transfer
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spi->MCR |= SPI_MCR_CLR_TXF_MASK | SPI_MCR_CLR_RXF_MASK;
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while((spi->SR & SPI_SR_TFFF_MASK) == 0) ;
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spi->PUSHR = SPI_PUSHR_EOQ_MASK | val;
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spi->SR |= SPI_SR_TFFF_MASK;
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while((spi->SR & SPI_SR_RFDF_MASK) == 0) ;
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spi->SR |= SPI_SR_RFDF_MASK;
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spi->MCR |= SPI_MCR_HALT_MASK; // Start transfer
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return spi->POPR;
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}
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int spiMk22_init(const struct spiDevice *dev, const uint8_t pbr, const uint8_t br,
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const uint8_t flags)
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{
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SPI_Type *spi = (SPI_Type *) dev->priv;
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switch((uint32_t) spi)
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{
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case SPI0_BASE:
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SIM->SCGC6 |= SIM_SCGC6_SPI0_MASK;
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__DSB();
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break;
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case SPI1_BASE:
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SIM->SCGC6 |= SIM_SCGC6_SPI1_MASK;
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__DSB();
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break;
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default:
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return -ENODEV;
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break;
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}
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spi->MCR &= ~SPI_MCR_MDIS_MASK; // Enable the SPI module
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spi->MCR |= SPI_MCR_MSTR_MASK // Master mode
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| SPI_MCR_PCSIS_MASK // CS high when inactive
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| SPI_MCR_DIS_RXF_MASK // Disable RX FIFO
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| SPI_MCR_DIS_TXF_MASK // Disable TX FIFO
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| SPI_MCR_HALT_MASK; // Stop transfers
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spi->CTAR[0] = SPI_CTAR_FMSZ(7) // 8bit frame size
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| SPI_CTAR_PBR(pbr) // CLK prescaler divide by 5
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| SPI_CTAR_BR(br) // CLK scaler divide by 8
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| SPI_CTAR_PCSSCK(1)
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| SPI_CTAR_PASC(1)
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| SPI_CTAR_CSSCK(4)
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| SPI_CTAR_ASC(4);
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if((flags & SPI_FLAG_CPOL) != 0)
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spi->CTAR[0] |= SPI_CTAR_CPOL_MASK;
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if((flags & SPI_FLAG_CPHA) != 0)
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spi->CTAR[0] |= SPI_CTAR_CPHA_MASK;
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if((flags & SPI_LSB_FIRST) != 0)
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spi->CTAR[0] |= SPI_CTAR_LSBFE_MASK;
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if(dev->mutex != NULL)
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pthread_mutex_init((pthread_mutex_t *) dev->mutex, NULL);
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return 0;
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}
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void spiMk22_terminate(const struct spiDevice *dev)
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{
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SPI_Type *spi = (SPI_Type *) dev->priv;
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switch((uint32_t) spi)
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{
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case SPI0_BASE:
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SIM->SCGC6 &= ~SIM_SCGC6_SPI0_MASK;
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__DSB();
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break;
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case SPI1_BASE:
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SIM->SCGC6 &= ~SIM_SCGC6_SPI1_MASK;
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__DSB();
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break;
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default:
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break;
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}
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if(dev->mutex != NULL)
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pthread_mutex_destroy((pthread_mutex_t *) dev->mutex);
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}
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int spiMk22_transfer(const struct spiDevice *dev, const void *txBuf,
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void *rxBuf, const size_t size)
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{
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SPI_Type *spi = (SPI_Type *) dev->priv;
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uint8_t *rxData = (uint8_t *) rxBuf;
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const uint8_t *txData = (const uint8_t *) txBuf;
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// Send only
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if(rxBuf == NULL)
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{
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for(size_t i = 0; i < size; i++)
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spi_sendRecv(spi, txData[i]);
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return 0;
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}
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// Receive only
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if(txBuf == NULL)
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{
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for(size_t i = 0; i < size; i++)
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rxData[i] = spi_sendRecv(spi, 0x00);
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return 0;
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}
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// Transmit and receive
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for(size_t i = 0; i < size; i++)
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rxData[i] = spi_sendRecv(spi, txData[i]);
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return 0;
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}
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@ -0,0 +1,73 @@
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/***************************************************************************
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* Copyright (C) 2021 - 2024 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#ifndef SPI_MK22_H
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#define SPI_MK22_H
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#include <peripherals/spi.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* Instantiate an MK22 SPI master device.
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*
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* @param name: device name.
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* @param peripheral: underlying MCU peripheral.
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* @param mutx: pointer to mutex, or NULL.
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*/
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#define SPI_MK22_DEVICE_DEFINE(name, peripheral, mutx) \
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extern int spiMk22_transfer(const struct spiDevice *dev, const void *txBuf, \
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void *rxBuf, const size_t size); \
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const struct spiDevice name = \
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{ \
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.transfer = &spiMk22_transfer, \
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.priv = peripheral, \
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.mutex = mutx \
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};
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/**
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* Initialise an SPI peripheral and driver.
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* Is left to application code to change the operating mode and alternate function
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* mapping of the corresponding gpio lines.
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*
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* @param dev: SPI device descriptor.
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* @param pbr: value for the baud rate prescaler (see reference manual).
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* @param br: value for the baud rate scaler (see reference manual).
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* @param flags: SPI configuration flags.
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* @return zero on success, a negative error code otherwise.
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*/
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int spiMk22_init(const struct spiDevice *dev, const uint8_t pbr, const uint8_t br,
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const uint8_t flags);
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/**
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* Shut down an SPI peripheral and driver.
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*
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* @param dev: SPI device descriptor.
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*/
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void spiMk22_terminate(const struct spiDevice *dev);
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#ifdef __cplusplus
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}
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#endif
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#endif /* SPI_MK22_H */
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