ARMmbed
/
mbed-os
mirror of https://github.com/ARMmbed/mbed-os.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
mbed-os/targets/TARGET_Maxim/TARGET_MAX32660/spi_api.c

340 lines
11 KiB
C
Raw Permalink Blame History

/*******************************************************************************
* Copyright (c) Maxim Integrated Products, Inc., All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the name of Maxim Integrated
* Products, Inc. shall not be used except as stated in the Maxim Integrated
* Products, Inc. Branding Policy.
*
* The mere transfer of this software does not imply any licenses
* of trade secrets, proprietary technology, copyrights, patents,
* trademarks, maskwork rights, or any other form of intellectual
* property whatsoever. Maxim Integrated Products, Inc. retains all
* ownership rights.
*******************************************************************************
*/
#include <stdio.h>
#include "mbed_assert.h"
#include "mbed_critical.h"
#include "spi_api.h" // mbed HAL
#include "mxc_sys.h"
#include "spi_regs.h"
#include "spimss_regs.h"
#include "spimss.h"
#include "mxc_spi.h"
#include "pinmap.h"
#include "PeripheralPins.h"
#define SPI_NUM_0 0 // SPI17Y
#define SPI_NUM_1A 1 // SPIMSS MAPA
#define SPI_NUM_1B 2 // SPIMSS MAPB
#define SPI_NUM_MAX 3 //
static unsigned int spi_speed = 1000000;
static unsigned int spi_mode = 0;
static unsigned int g_drv_ssel = 1;
static int master_send(int spi_num, void *req)
{
int error = E_NO_ERROR;
if (spi_num == SPI_NUM_0) {
error = MXC_SPI_MasterTransaction((mxc_spi_req_t *)req);
} else if (spi_num < SPI_NUM_MAX) {
mxc_spimss_req_t spimss_req;
mxc_spi_req_t *req_tmp = (mxc_spi_req_t *)req;
spimss_req.ssel = req_tmp->ssIdx; /**< Not Used*/
spimss_req.deass = req_tmp->ssDeassert; /**< Not Used*/
spimss_req.tx_data = req_tmp->txData; /**< Pointer to a buffer to transmit data from. NULL if undesired. */
spimss_req.rx_data = req_tmp->rxData; /**< Pointer to a buffer to store data received. NULL if undesired.*/
spimss_req.width = DUMMY_1; /**< Not Used */
/**< Number of transfer units to send from the \p tx_data buffer. */
spimss_req.len = (req_tmp->txLen > req_tmp->rxLen)? req_tmp->txLen: req_tmp->rxLen;
spimss_req.bits = 8; /**< Number of bits in transfer unit (e.g. 8 for byte, 16 for short) */
spimss_req.rx_num = req_tmp->rxCnt; /**< Number of bytes actually read into the \p rx_data buffer. */
spimss_req.tx_num = req_tmp->txCnt; /**< Number of bytes actually sent from the \p tx_data buffer */
spimss_req.callback = NULL; /**< Callback function if desired, NULL otherwise */
error = MXC_SPIMSS_MasterTrans(MXC_SPIMSS, &spimss_req);
} else {
return E_BAD_PARAM;
}
return error;
}
//******************************************************************************
void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
{
// Make sure pins are pointing to the same SPI instance
SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
SPIName spi_cntl;
// Control is SCK and optionaly SS
if ((SPIName)spi_ssel != (SPIName)NC) {
g_drv_ssel = 1; // Driver will drive SSEL pin
spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
} else {
g_drv_ssel = 0; // Driver will NOT drive SSEL pin
spi_cntl = spi_sclk;
}
SPIName spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
MBED_ASSERT((SPIName)spi != (SPIName)NC);
if (spi == SPI_0) {
obj->spi = MXC_SPI0;
obj->index = SPI_NUM_0;
MXC_SPI_Init(obj->spi, 1, 0, 1, 0, spi_speed, g_drv_ssel);
MXC_SPI_SetDataSize(obj->spi, 8);
MXC_SPI_SetWidth(obj->spi, SPI_WIDTH_STANDARD);
}
else if(spi == SPI_1) {
obj->spi = (void *)MXC_SPIMSS;
if (pinmap_function(mosi, PinMap_SPI_MOSI) == 1) {
obj->index = SPI_NUM_1A;
MXC_SPIMSS_Init(obj->spi, spi_mode, spi_speed, MAP_A, g_drv_ssel);
} else {
obj->index = SPI_NUM_1B;
MXC_SPIMSS_Init(obj->spi, spi_mode, spi_speed, MAP_B, g_drv_ssel);
}
}
// Configure Slave Slect Pin if defined
if ((SPIName)spi_ssel != (SPIName)NC) {
uint32_t function = pinmap_function(ssel, PinMap_SPI_SSEL);
if (function != (uint32_t)NC) {
pin_function(ssel, function+1);// index start from 1;
pin_mode(ssel, PullNone);
}
}
}
//******************************************************************************
void spi_format(spi_t *obj, int bits, int mode, int slave)
{
// Only supports master mode
MBED_ASSERT(!slave);
spi_mode = mode;
if (obj->index == SPI_NUM_0) {
MXC_SPI_SetDataSize(obj->spi, bits);
MXC_SPI_SetMode(obj->spi, (mxc_spi_mode_t)mode);
}
else if (obj->index < SPI_NUM_MAX) {
MXC_SPIMSS_Shutdown(obj->spi);
if (obj->index == SPI_NUM_1A) {
MXC_SPIMSS_Init(obj->spi, spi_mode, spi_speed, MAP_A, g_drv_ssel);
} else {
MXC_SPIMSS_Init(obj->spi, spi_mode, spi_speed, MAP_B, g_drv_ssel);
}
}
}
////******************************************************************************
void spi_frequency(spi_t *obj, int hz)
{
// Maximum frequency is the PeripheralClock
MBED_ASSERT((unsigned int)hz <= PeripheralClock);
if (obj->index == SPI_NUM_0) {
spi_speed = hz;
MXC_SPI_SetFrequency(obj->spi, spi_speed);
}
else if (obj->index < SPI_NUM_MAX) {
spi_speed = hz;
MXC_SPIMSS_Shutdown(obj->spi);
if (obj->index == SPI_NUM_1A) {
MXC_SPIMSS_Init(obj->spi, spi_mode, spi_speed, MAP_A, g_drv_ssel);
} else {
MXC_SPIMSS_Init(obj->spi, spi_mode, spi_speed, MAP_B, g_drv_ssel);
}
}
}
////******************************************************************************
int spi_master_write(spi_t *obj, int value)
{
mxc_spi_req_t req;
uint8_t out, in;
// Prepare req structure for transfer
out = value;
//SPI Request
req.spi = obj->spi;
req.txData = &out;
req.rxData = &in;
req.txLen = 1;
req.rxLen = 1;
req.ssIdx = 0;
req.ssDeassert = 1;
req.txCnt = 0;
req.rxCnt = 0;
req.completeCB = NULL;
// Start transfer
master_send(obj->index, &req);
return in;
}
////******************************************************************************
int spi_master_block_write(spi_t *obj, const char *tx_buffer, int tx_length, char *rx_buffer, int rx_length, char write_fill)
{
mxc_spi_req_t req;
if (!(tx_length | rx_length) ||
(tx_length < 0) ||
(rx_length < 0)) {
return 0;
}
req.spi = obj->spi;
req.ssIdx = 0;
req.ssDeassert = 1;
req.txCnt = 0;
req.rxCnt = 0;
req.completeCB = NULL;
if (obj->index == SPI_NUM_0) {
MXC_SPI_SetDefaultTXData(obj->spi, write_fill);
} else {
MXC_SPIMSS_SetDefaultTXData(obj->spi, write_fill);
}
core_util_critical_section_enter();
if (tx_length == rx_length) {
req.txData = (uint8_t *)tx_buffer;
req.txLen = tx_length;
req.rxData = (uint8_t *)rx_buffer;
req.rxLen = rx_length;
master_send(obj->index, &req);
} else if (tx_length < rx_length) {
if (tx_length == 0) {
req.txData = NULL;
req.txLen = 0;
req.rxData = (uint8_t *)rx_buffer;
req.rxLen = rx_length;
master_send(obj->index, &req);
} else {
req.txData = (uint8_t *)tx_buffer;
req.txLen = tx_length;
req.rxData = (uint8_t *)rx_buffer;
req.rxLen = tx_length;
master_send(obj->index, &req);
req.txData = NULL;
req.txLen = 0;
req.rxData = (uint8_t *)&rx_buffer[tx_length];
req.rxLen = rx_length-tx_length;
req.txCnt = 0;
req.rxCnt = 0;
master_send(obj->index, &req);
}
} else {
if (rx_length == 0) {
req.txData = (uint8_t *)tx_buffer;
req.txLen = tx_length;
req.rxData = NULL;
req.rxLen = 0;
master_send(obj->index, &req);
} else {
req.txData = (uint8_t *)tx_buffer;
req.txLen = rx_length;
req.rxData = (uint8_t *)rx_buffer;
req.rxLen = rx_length;
master_send(obj->index, &req);
req.txData = (uint8_t *)&tx_buffer[rx_length];
req.txLen = tx_length-rx_length;
req.rxData = NULL;
req.rxLen = 0;
req.txCnt = 0;
req.rxCnt = 0;
master_send(obj->index, &req);
}
}
core_util_critical_section_exit();
return tx_length > rx_length ? tx_length : rx_length;
}
//******************************************************************************
int spi_busy(spi_t *obj)
{
if (obj->index == SPI_NUM_0) {
return (((mxc_spi_regs_t *)obj->spi)->stat & MXC_F_SPI_STAT_BUSY);
}
else if (obj->index < SPI_NUM_MAX) {
unsigned int reg = ((mxc_spimss_regs_t *)obj->spi)->int_fl;
return (reg & MXC_F_SPIMSS_INT_FL_TXST) >> MXC_F_SPIMSS_INT_FL_TXST_POS;
}
return 1;
}
//******************************************************************************
uint8_t spi_get_module(spi_t *obj)
{
return obj->index;
}
//******************************************************************************
const PinMap *spi_master_mosi_pinmap()
{
return PinMap_SPI_MOSI;
}
const PinMap *spi_master_miso_pinmap()
{
return PinMap_SPI_MISO;
}
const PinMap *spi_master_clk_pinmap()
{
return PinMap_SPI_SCLK;
}
const PinMap *spi_master_cs_pinmap()
{
return PinMap_SPI_SSEL;
}
Reference in New Issue View Git Blame Copy Permalink