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cdee64cb07
arduino-esp32/cores/esp32/esp32-hal-spi.c
me-no-dev cdee64cb07 remove unnecessary locks
2016-10-14 03:16:02 +03:00

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// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// 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 "esp32-hal-spi.h"
#include "esp32-hal.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/semphr.h"
#include "rom/ets_sys.h"
#include "esp_attr.h"
#include "esp_intr.h"
#include "rom/gpio.h"
#include "soc/spi_reg.h"
#include "soc/spi_struct.h"
#include "soc/io_mux_reg.h"
#include "soc/gpio_sig_map.h"
#include "soc/dport_reg.h"
#define SPI_CLK_IDX(p) ((p==0)?SPICLK_OUT_IDX:((p==1)?SPICLK_OUT_IDX:((p==2)?HSPICLK_OUT_IDX:((p==3)?VSPICLK_OUT_MUX_IDX:0))))
#define SPI_MISO_IDX(p) ((p==0)?SPIQ_OUT_IDX:((p==1)?SPIQ_OUT_IDX:((p==2)?HSPIQ_OUT_IDX:((p==3)?VSPIQ_OUT_IDX:0))))
#define SPI_MOSI_IDX(p) ((p==0)?SPID_IN_IDX:((p==1)?SPID_IN_IDX:((p==2)?HSPID_IN_IDX:((p==3)?VSPID_IN_IDX:0))))
#define SPI_SPI_SS_IDX(n) ((n==0)?SPICS0_OUT_IDX:((n==1)?SPICS1_OUT_IDX:((n==2)?SPICS2_OUT_IDX:SPICS0_OUT_IDX)))
#define SPI_HSPI_SS_IDX(n) ((n==0)?HSPICS0_OUT_IDX:((n==1)?HSPICS1_OUT_IDX:((n==2)?HSPICS2_OUT_IDX:HSPICS0_OUT_IDX)))
#define SPI_VSPI_SS_IDX(n) ((n==0)?VSPICS0_OUT_IDX:((n==1)?VSPICS1_OUT_IDX:((n==2)?VSPICS2_OUT_IDX:VSPICS0_OUT_IDX)))
#define SPI_SS_IDX(p, n) ((p==0)?SPI_SPI_SS_IDX(n):((p==1)?SPI_SPI_SS_IDX(n):((p==2)?SPI_HSPI_SS_IDX(n):((p==3)?SPI_VSPI_SS_IDX(n):0))))
#define SPI_INUM(u) (2)
#define SPI_INTR_SOURCE(u) ((u==0)?ETS_SPI0_INTR_SOURCE:((u==1)?ETS_SPI1_INTR_SOURCE:((u==2)?ETS_SPI2_INTR_SOURCE:((p==3)?ETS_SPI3_INTR_SOURCE:0))))
struct spi_struct_t {
spi_dev_t * dev;
xSemaphoreHandle lock;
uint8_t num;
};
#define SPI_MUTEX_LOCK() do {} while (xSemaphoreTake(spi->lock, portMAX_DELAY) != pdPASS)
#define SPI_MUTEX_UNLOCK() xSemaphoreGive(spi->lock)
static spi_t _spi_bus_array[4] = {
{(volatile spi_dev_t *)(DR_REG_SPI0_BASE), NULL, 0},
{(volatile spi_dev_t *)(DR_REG_SPI1_BASE), NULL, 1},
{(volatile spi_dev_t *)(DR_REG_SPI2_BASE), NULL, 2},
{(volatile spi_dev_t *)(DR_REG_SPI3_BASE), NULL, 3}
};
void spiAttachSCK(spi_t * spi, int8_t sck)
{
if(!spi) {
return;
}
if(sck < 0) {
if(spi->num == HSPI) {
sck = 14;
} else if(spi->num == VSPI) {
sck = 18;
} else {
sck = 6;
}
}
pinMode(sck, OUTPUT);
pinMatrixOutAttach(sck, SPI_CLK_IDX(spi->num), false, false);
}
void spiAttachMISO(spi_t * spi, int8_t miso)
{
if(!spi) {
return;
}
if(miso < 0) {
if(spi->num == HSPI) {
miso = 12;
} else if(spi->num == VSPI) {
miso = 19;
} else {
miso = 7;
}
}
SPI_MUTEX_LOCK();
pinMode(miso, INPUT);
pinMatrixInAttach(miso, SPI_MISO_IDX(spi->num), false);
SPI_MUTEX_UNLOCK();
}
void spiAttachMOSI(spi_t * spi, int8_t mosi)
{
if(!spi) {
return;
}
if(mosi < 0) {
if(spi->num == HSPI) {
mosi = 13;
} else if(spi->num == VSPI) {
mosi = 23;
} else {
mosi = 8;
}
}
pinMode(mosi, OUTPUT);
pinMatrixOutAttach(mosi, SPI_MOSI_IDX(spi->num), false, false);
}
void spiDetachSCK(spi_t * spi, int8_t sck)
{
if(!spi) {
return;
}
if(sck < 0) {
if(spi->num == HSPI) {
sck = 14;
} else if(spi->num == VSPI) {
sck = 18;
} else {
sck = 6;
}
}
pinMatrixOutDetach(sck, false, false);
pinMode(sck, INPUT);
}
void spiDetachMISO(spi_t * spi, int8_t miso)
{
if(!spi) {
return;
}
if(miso < 0) {
if(spi->num == HSPI) {
miso = 12;
} else if(spi->num == VSPI) {
miso = 19;
} else {
miso = 7;
}
}
pinMatrixInDetach(SPI_MISO_IDX(spi->num), false, false);
pinMode(miso, INPUT);
}
void spiDetachMOSI(spi_t * spi, int8_t mosi)
{
if(!spi) {
return;
}
if(mosi < 0) {
if(spi->num == HSPI) {
mosi = 13;
} else if(spi->num == VSPI) {
mosi = 23;
} else {
mosi = 8;
}
}
pinMatrixOutDetach(mosi, false, false);
pinMode(mosi, INPUT);
}
void spiAttachSS(spi_t * spi, uint8_t cs_num, int8_t ss)
{
if(!spi) {
return;
}
if(cs_num > 2) {
return;
}
if(ss < 0) {
cs_num = 0;
if(spi->num == HSPI) {
ss = 15;
} else if(spi->num == VSPI) {
ss = 5;
} else {
ss = 11;
}
}
pinMode(ss, OUTPUT);
pinMatrixOutAttach(ss, SPI_SS_IDX(spi->num, cs_num), false, false);
spiEnableSSPins(spi, (1 << cs_num));
}
void spiDetachSS(spi_t * spi, int8_t ss)
{
if(!spi) {
return;
}
if(ss < 0) {
if(spi->num == HSPI) {
ss = 15;
} else if(spi->num == VSPI) {
ss = 5;
} else {
ss = 11;
}
}
pinMatrixOutDetach(ss, false, false);
pinMode(ss, INPUT);
}
void spiEnableSSPins(spi_t * spi, uint8_t cs_mask)
{
if(!spi) {
return;
}
SPI_MUTEX_LOCK();
spi->dev->pin.val &= ~(cs_mask & SPI_CS_MASK_ALL);
SPI_MUTEX_UNLOCK();
}
void spiDisableSSPins(spi_t * spi, uint8_t cs_mask)
{
if(!spi) {
return;
}
SPI_MUTEX_LOCK();
spi->dev->pin.val |= (cs_mask & SPI_CS_MASK_ALL);
SPI_MUTEX_UNLOCK();
}
void spiSSEnable(spi_t * spi)
{
if(!spi) {
return;
}
SPI_MUTEX_LOCK();
spi->dev->user.cs_setup = 1;
spi->dev->user.cs_hold = 1;
SPI_MUTEX_UNLOCK();
}
void spiSSDisable(spi_t * spi)
{
if(!spi) {
return;
}
SPI_MUTEX_LOCK();
spi->dev->user.cs_setup = 0;
spi->dev->user.cs_hold = 0;
SPI_MUTEX_UNLOCK();
}
void spiSSSet(spi_t * spi)
{
if(!spi) {
return;
}
SPI_MUTEX_LOCK();
spi->dev->pin.cs_keep_active = 1;
SPI_MUTEX_UNLOCK();
}
void spiSSClear(spi_t * spi)
{
if(!spi) {
return;
}
SPI_MUTEX_LOCK();
spi->dev->pin.cs_keep_active = 0;
SPI_MUTEX_UNLOCK();
}
uint32_t spiGetClockDiv(spi_t * spi)
{
if(!spi) {
return 0;
}
return spi->dev->clock.val;
}
void spiSetClockDiv(spi_t * spi, uint32_t clockDiv)
{
if(!spi) {
return;
}
SPI_MUTEX_LOCK();
spi->dev->clock.val = clockDiv;
SPI_MUTEX_UNLOCK();
}
uint8_t spiGetDataMode(spi_t * spi)
{
if(!spi) {
return 0;
}
bool idleEdge = spi->dev->pin.ck_idle_edge;
bool outEdge = spi->dev->user.ck_out_edge;
if(idleEdge) {
if(outEdge) {
return SPI_MODE3;
}
return SPI_MODE2;
}
if(outEdge) {
return SPI_MODE1;
}
return SPI_MODE0;
}
void spiSetDataMode(spi_t * spi, uint8_t dataMode)
{
if(!spi) {
return;
}
SPI_MUTEX_LOCK();
switch (dataMode) {
case SPI_MODE1:
spi->dev->pin.ck_idle_edge = 0;
spi->dev->user.ck_out_edge = 1;
break;
case SPI_MODE2:
spi->dev->pin.ck_idle_edge = 1;
spi->dev->user.ck_out_edge = 0;
break;
case SPI_MODE3:
spi->dev->pin.ck_idle_edge = 1;
spi->dev->user.ck_out_edge = 1;
break;
case SPI_MODE0:
default:
spi->dev->pin.ck_idle_edge = 0;
spi->dev->user.ck_out_edge = 0;
break;
}
SPI_MUTEX_UNLOCK();
}
uint8_t spiGetBitOrder(spi_t * spi)
{
if(!spi) {
return 0;
}
return (spi->dev->ctrl.wr_bit_order | spi->dev->ctrl.rd_bit_order) == 0;
}
void spiSetBitOrder(spi_t * spi, uint8_t bitOrder)
{
if(!spi) {
return;
}
SPI_MUTEX_LOCK();
if (SPI_MSBFIRST == bitOrder) {
spi->dev->ctrl.wr_bit_order = 0;
spi->dev->ctrl.rd_bit_order = 0;
} else if (SPI_LSBFIRST == bitOrder) {
spi->dev->ctrl.wr_bit_order = 1;
spi->dev->ctrl.rd_bit_order = 1;
}
SPI_MUTEX_UNLOCK();
}
void spiStopBus(spi_t * spi)
{
if(!spi) {
return;
}
SPI_MUTEX_LOCK();
spi->dev->slave.trans_done = 0;
spi->dev->slave.slave_mode = 0;
spi->dev->pin.val = 0;
spi->dev->user.val = 0;
spi->dev->user1.val = 0;
spi->dev->ctrl.val = 0;
spi->dev->ctrl1.val = 0;
spi->dev->ctrl2.val = 0;
spi->dev->clock.val = 0;
SPI_MUTEX_UNLOCK();
}
spi_t * spiStartBus(uint8_t spi_num, uint32_t clockDiv, uint8_t dataMode, uint8_t bitOrder)
{
if(spi_num > 3){
return NULL;
}
spi_t * spi = &_spi_bus_array[spi_num];
if(spi->lock == NULL){
spi->lock = xSemaphoreCreateMutex();
if(spi->lock == NULL) {
return NULL;
}
}
if(spi_num == HSPI) {
SET_PERI_REG_MASK(DPORT_PERIP_CLK_EN_REG, DPORT_SPI_CLK_EN_1);
CLEAR_PERI_REG_MASK(DPORT_PERIP_RST_EN_REG, DPORT_SPI_RST_1);
} else if(spi_num == VSPI) {
SET_PERI_REG_MASK(DPORT_PERIP_CLK_EN_REG, DPORT_SPI_CLK_EN_2);
CLEAR_PERI_REG_MASK(DPORT_PERIP_RST_EN_REG, DPORT_SPI_RST_2);
} else {
SET_PERI_REG_MASK(DPORT_PERIP_CLK_EN_REG, DPORT_SPI_CLK_EN);
CLEAR_PERI_REG_MASK(DPORT_PERIP_RST_EN_REG, DPORT_SPI_RST);
}
spiStopBus(spi);
spiSetDataMode(spi, dataMode);
spiSetBitOrder(spi, bitOrder);
spiSetClockDiv(spi, clockDiv);
SPI_MUTEX_LOCK();
spi->dev->user.usr_mosi = 1;
spi->dev->user.usr_miso = 1;
spi->dev->user.doutdin = 1;
int i;
for(i=0; i<16; i++) {
spi->dev->data_buf[i] = 0x00000000;
}
SPI_MUTEX_UNLOCK();
return spi;
}
void spiWaitReady(spi_t * spi)
{
if(!spi) {
return;
}
while(spi->dev->cmd.usr);
}
void spiWrite(spi_t * spi, uint32_t *data, uint8_t len)
{
if(!spi) {
return;
}
int i;
if(len > 16) {
len = 16;
}
SPI_MUTEX_LOCK();
while(spi->dev->cmd.usr);
spi->dev->mosi_dlen.usr_mosi_dbitlen = (len * 32) - 1;
spi->dev->miso_dlen.usr_miso_dbitlen = (len * 32) - 1;
for(i=0; i<len; i++) {
spi->dev->data_buf[i] = data[i];
}
spi->dev->cmd.usr = 1;
SPI_MUTEX_UNLOCK();
}
void spiRead(spi_t * spi, uint32_t *data, uint8_t len)
{
if(!spi) {
return;
}
int i;
if(len > 16) {
len = 16;
}
SPI_MUTEX_LOCK();
while(spi->dev->cmd.usr);
for(i=0; i<len; i++) {
data[i] = spi->dev->data_buf[i];
}
SPI_MUTEX_UNLOCK();
}
void spiWriteByte(spi_t * spi, uint8_t data)
{
if(!spi) {
return;
}
SPI_MUTEX_LOCK();
while(spi->dev->cmd.usr);
spi->dev->mosi_dlen.usr_mosi_dbitlen = 7;
spi->dev->miso_dlen.usr_miso_dbitlen = 7;
spi->dev->data_buf[0] = data;
spi->dev->cmd.usr = 1;
SPI_MUTEX_UNLOCK();
}
uint8_t spiReadByte(spi_t * spi)
{
if(!spi) {
return 0;
}
uint8_t data;
SPI_MUTEX_LOCK();
while(spi->dev->cmd.usr);
data = spi->dev->data_buf[0] & 0xFF;
SPI_MUTEX_UNLOCK();
return data;
}
uint32_t __spiTranslate16(uint16_t data, bool msb)
{
if(msb) {
return (data >> 8) | (data << 8);
} else {
return data;
}
}
uint32_t __spiTranslate24(uint32_t data, bool msb)
{
if(msb) {
union {
uint32_t l;
uint8_t b[4];
} out;
out.l = data;
return out.b[2] | (out.b[1] << 8) | (out.b[0] << 16);
} else {
return data;
}
}
uint32_t __spiTranslate32(uint32_t data, bool msb)
{
if(msb) {
union {
uint32_t l;
uint8_t b[4];
} out;
out.l = data;
return out.b[3] | (out.b[2] << 8) | (out.b[1] << 16) | (out.b[0] << 24);
} else {
return data;
}
}
void spiWriteWord(spi_t * spi, uint16_t data)
{
if(!spi) {
return;
}
SPI_MUTEX_LOCK();
while(spi->dev->cmd.usr);
spi->dev->mosi_dlen.usr_mosi_dbitlen = 15;
spi->dev->miso_dlen.usr_miso_dbitlen = 15;
spi->dev->data_buf[0] = __spiTranslate16(data, !spi->dev->ctrl.wr_bit_order);
spi->dev->cmd.usr = 1;
SPI_MUTEX_UNLOCK();
}
uint16_t spiReadWord(spi_t * spi)
{
if(!spi) {
return 0;
}
uint16_t data;
SPI_MUTEX_LOCK();
while(spi->dev->cmd.usr);
data = __spiTranslate16(spi->dev->data_buf[0] & 0xFFFF, !spi->dev->ctrl.rd_bit_order);
SPI_MUTEX_UNLOCK();
return data;
}
void spiWriteLong(spi_t * spi, uint32_t data)
{
if(!spi) {
return;
}
SPI_MUTEX_LOCK();
while(spi->dev->cmd.usr);
spi->dev->mosi_dlen.usr_mosi_dbitlen = 31;
spi->dev->miso_dlen.usr_miso_dbitlen = 31;
spi->dev->data_buf[0] = __spiTranslate32(data, !spi->dev->ctrl.wr_bit_order);
spi->dev->cmd.usr = 1;
SPI_MUTEX_UNLOCK();
}
uint32_t spiReadLong(spi_t * spi)
{
if(!spi) {
return 0;
}
uint32_t data;
SPI_MUTEX_LOCK();
while(spi->dev->cmd.usr);
data = __spiTranslate32(spi->dev->data_buf[0], !spi->dev->ctrl.rd_bit_order);
SPI_MUTEX_UNLOCK();
return data;
}
void spiTransferBits(spi_t * spi, uint32_t data, uint32_t * out, uint8_t bits)
{
if(!spi) {
return;
}
if(bits > 32) {
bits = 32;
}
uint32_t bytes = (bits + 7) / 8;//64 max
uint32_t mask = (((uint64_t)1 << bits) - 1) & 0xFFFFFFFF;
SPI_MUTEX_LOCK();
while(spi->dev->cmd.usr);
spi->dev->mosi_dlen.usr_mosi_dbitlen = (bits - 1);
spi->dev->miso_dlen.usr_miso_dbitlen = (bits - 1);
if(bytes == 1) {
spi->dev->data_buf[0] = data & mask;
} else if(bytes == 2) {
spi->dev->data_buf[0] = __spiTranslate16(data & mask, !spi->dev->ctrl.wr_bit_order);
} else if(bytes == 3) {
spi->dev->data_buf[0] = __spiTranslate24(data & mask, !spi->dev->ctrl.wr_bit_order);
} else {
spi->dev->data_buf[0] = __spiTranslate32(data & mask, !spi->dev->ctrl.wr_bit_order);
}
spi->dev->cmd.usr = 1;
if(out) {
while(spi->dev->cmd.usr);
if(bytes == 1) {
*out = spi->dev->data_buf[0] & mask;
} else if(bytes == 2) {
*out = __spiTranslate16(spi->dev->data_buf[0] & mask, !spi->dev->ctrl.wr_bit_order);
} else if(bytes == 3) {
*out = __spiTranslate24(spi->dev->data_buf[0] & mask, !spi->dev->ctrl.wr_bit_order);
} else {
*out = __spiTranslate32(spi->dev->data_buf[0] & mask, !spi->dev->ctrl.wr_bit_order);
}
}
SPI_MUTEX_UNLOCK();
}
void __spiTransferBytes(spi_t * spi, uint8_t * data, uint8_t * out, uint32_t bytes)
{
if(!spi) {
return;
}
int i;
if(bytes > 64) {
bytes = 64;
}
uint32_t words = (bytes + 3) / 4;//16 max
uint32_t wordsBuf[16] = {0,};
uint8_t * bytesBuf = (uint8_t *) wordsBuf;
if(data) {
for(i=0; i<bytes; i++) {
bytesBuf[i] = data[i];//copy data to buffer
}
}
while(spi->dev->cmd.usr);
spi->dev->mosi_dlen.usr_mosi_dbitlen = ((bytes * 8) - 1);
spi->dev->miso_dlen.usr_miso_dbitlen = ((bytes * 8) - 1);
for(i=0; i<words; i++) {
spi->dev->data_buf[i] = wordsBuf[i]; //copy buffer to spi fifo
}
spi->dev->cmd.usr = 1;
if(out) {
while(spi->dev->cmd.usr);
for(i=0; i<words; i++) {
wordsBuf[i] = spi->dev->data_buf[i];//copy spi fifo to buffer
}
for(i=0; i<bytes; i++) {
out[i] = bytesBuf[i];//copy buffer to output
}
}
}
void spiTransferBytes(spi_t * spi, uint8_t * data, uint8_t * out, uint32_t size)
{
if(!spi) {
return;
}
SPI_MUTEX_LOCK();
while(size) {
if(size > 64) {
__spiTransferBytes(spi, data, out, 64);
size -= 64;
if(data) {
data += 64;
}
if(out) {
out += 64;
}
} else {
__spiTransferBytes(spi, data, out, size);
size = 0;
}
}
SPI_MUTEX_UNLOCK();
}
typedef union {
uint32_t regValue;
struct {
unsigned regL :6;
unsigned regH :6;
unsigned regN :6;
unsigned regPre :13;
unsigned regEQU :1;
};
} spiClk_t;
#define ClkRegToFreq(reg) (CPU_CLK_FREQ / (((reg)->regPre + 1) * ((reg)->regN + 1)))
uint32_t spiClockDivToFrequency(uint32_t clockDiv)
{
spiClk_t reg = { clockDiv };
return ClkRegToFreq(&reg);
}
uint32_t spiFrequencyToClockDiv(uint32_t freq)
{
if(freq >= CPU_CLK_FREQ) {
return SPI_CLK_EQU_SYSCLK;
}
const spiClk_t minFreqReg = { 0x7FFFF000 };
uint32_t minFreq = ClkRegToFreq((spiClk_t*) &minFreqReg);
if(freq < minFreq) {
return minFreqReg.regValue;
}
uint8_t calN = 1;
spiClk_t bestReg = { 0 };
int32_t bestFreq = 0;
while(calN <= 0x3F) {
spiClk_t reg = { 0 };
int32_t calFreq;
int32_t calPre;
int8_t calPreVari = -2;
reg.regN = calN;
while(calPreVari++ <= 1) {
calPre = (((CPU_CLK_FREQ / (reg.regN + 1)) / freq) - 1) + calPreVari;
if(calPre > 0x1FFF) {
reg.regPre = 0x1FFF;
} else if(calPre <= 0) {
reg.regPre = 0;
} else {
reg.regPre = calPre;
}
reg.regL = ((reg.regN + 1) / 2);
calFreq = ClkRegToFreq(&reg);
if(calFreq == (int32_t) freq) {
memcpy(&bestReg, &reg, sizeof(bestReg));
break;
} else if(calFreq < (int32_t) freq) {
if(abs(freq - calFreq) < abs(freq - bestFreq)) {
bestFreq = calFreq;
memcpy(&bestReg, &reg, sizeof(bestReg));
}
}
}
if(calFreq == (int32_t) freq) {
break;
}
calN++;
}
return bestReg.regValue;
}
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