arduino-esp32/cores/esp32/esp32-hal-i2c.c

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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-i2c.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "rom/ets_sys.h"
#include "soc/i2c_reg.h"
#include "soc/dport_reg.h"
#define I2C_DEV(i) (volatile i2c_dev_t *)((i)?DR_REG_I2C1_EXT_BASE:DR_REG_I2C_EXT_BASE)
//#define I2C_DEV(i) ((i2c_dev_t *)(REG_I2C_BASE(i)))
#define I2C_SCL_IDX(p) ((p==0)?I2CEXT0_SCL_OUT_IDX:((p==1)?I2CEXT1_SCL_OUT_IDX:0))
#define I2C_SDA_IDX(p) ((p==0)?I2CEXT0_SDA_OUT_IDX:((p==1)?I2CEXT1_SDA_OUT_IDX:0))
void i2cAttachSCL(i2c_t * i2c, int8_t scl)
{
pinMode(scl, OUTPUT);
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pinMatrixOutAttach(scl, I2C_SCL_IDX(i2c->num), false, false);
pinMatrixInAttach(scl, I2C_SCL_IDX(i2c->num), false);
}
void i2cDetachSCL(i2c_t * i2c, int8_t scl)
{
pinMatrixOutDetach(scl, false, false);
pinMatrixInDetach(I2C_SCL_IDX(i2c->num), false, false);
pinMode(scl, INPUT);
}
void i2cAttachSDA(i2c_t * i2c, int8_t sda)
{
pinMode(sda, OUTPUT_OPEN_DRAIN);
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pinMatrixOutAttach(sda, I2C_SDA_IDX(i2c->num), false, false);
pinMatrixInAttach(sda, I2C_SDA_IDX(i2c->num), false);
}
void i2cDetachSDA(i2c_t * i2c, int8_t sda)
{
pinMatrixOutDetach(sda, false, false);
pinMatrixInDetach(I2C_SDA_IDX(i2c->num), false, false);
pinMode(sda, INPUT);
}
enum {
I2C_CMD_RSTART,
I2C_CMD_WRITE,
I2C_CMD_READ,
I2C_CMD_STOP,
I2C_CMD_END
};
/*
* index - command index (0 to 15)
* op_code - is the command
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* byte_num - This register is to store the amounts of data that is read and written. byte_num in RSTART, STOP, END is null.
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* ack_val - Each data byte is terminated by an ACK bit used to set the bit level.
* ack_exp - This bit is to set an expected ACK value for the transmitter.
* ack_check - This bit is to decide whether the transmitter checks ACK bit. 1 means yes and 0 means no.
* */
void i2cSetCmd(i2c_t * i2c, uint8_t index, uint8_t op_code, uint8_t byte_num, bool ack_val, bool ack_exp, bool ack_check)
{
i2c->dev->command[index].val = 0;
i2c->dev->command[index].ack_en = ack_check;
i2c->dev->command[index].ack_exp = ack_exp;
i2c->dev->command[index].ack_val = ack_val;
i2c->dev->command[index].byte_num = byte_num;
i2c->dev->command[index].op_code = op_code;
}
int i2cWrite(i2c_t * i2c, uint16_t address, bool addr_10bit, uint8_t * data, uint8_t len, bool sendStop)
{
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int i;
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uint8_t index = 0;
uint8_t dataLen = len + (addr_10bit?2:1);
address = (address << 1);
while(dataLen) {
uint8_t willSend = (dataLen > 32)?32:dataLen;
uint8_t dataSend = willSend;
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i2cResetFiFo(i2c);
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//CMD START
i2cSetCmd(i2c, 0, I2C_CMD_RSTART, 0, false, false, false);
//CMD WRITE(ADDRESS + DATA)
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if(!index) {
i2c->dev->fifo_data.data = address & 0xFF;
dataSend--;
if(addr_10bit) {
i2c->dev->fifo_data.data = (address >> 8) & 0xFF;
dataSend--;
}
}
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i = 0;
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while(i<dataSend) {
i++;
i2c->dev->fifo_data.data = data[index++];
}
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i2cSetCmd(i2c, 1, I2C_CMD_WRITE, willSend, false, false, true);
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dataLen -= willSend;
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//CMD STOP or CMD END if there is more data
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if(dataLen) {
i2cSetCmd(i2c, 2, I2C_CMD_END, 0, false, false, false);
} else if(sendStop) {
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i2cSetCmd(i2c, 2, I2C_CMD_STOP, 0, false, false, false);
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}
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//Clear Interrupts
i2c->dev->int_clr.val = 0xFFFFFFFF;
//START Transmission
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i2c->dev->ctr.trans_start = 1;
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//WAIT Transmission
while(1) {
//Bus failed (maybe check for this while waiting?
if(i2c->dev->int_raw.arbitration_lost) {
//log_e("Bus Fail! Addr: %x", address >> 1);
return 4;
}
//Bus timeout
if(i2c->dev->int_raw.time_out) {
//log_e("Bus Timeout! Addr: %x", address >> 1);
return 3;
}
//Transmission did not finish and ACK_ERR is set
if(i2c->dev->int_raw.ack_err) {
//log_e("Ack Error! Addr: %x", address >> 1);
return 1;
}
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if(i2c->dev->ctr.trans_start || i2c->dev->status_reg.bus_busy || !(i2c->dev->int_raw.trans_complete) || !(i2c->dev->command[2].done)) {
continue;
} else if(i2c->dev->command[2].done) {
break;
}
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}
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}
return 0;
}
int i2cRead(i2c_t * i2c, uint16_t address, bool addr_10bit, uint8_t * data, uint8_t len, bool sendStop)
{
address = (address << 1) | 1;
uint8_t addrLen = (addr_10bit?2:1);
uint8_t index = 0;
uint8_t cmdIdx;
uint8_t willRead;
i2cResetFiFo(i2c);
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//CMD START
i2cSetCmd(i2c, 0, I2C_CMD_RSTART, 0, false, false, false);
//CMD WRITE ADDRESS
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i2c->dev->fifo_data.data = address & 0xFF;
if(addr_10bit) {
i2c->dev->fifo_data.data = (address >> 8) & 0xFF;
}
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i2cSetCmd(i2c, 1, I2C_CMD_WRITE, addrLen, false, false, true);
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while(len) {
cmdIdx = (index)?0:2;
willRead = (len > 32)?32:(len-1);
if(cmdIdx){
i2cResetFiFo(i2c);
}
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i2cSetCmd(i2c, cmdIdx++, I2C_CMD_READ, willRead, false, false, false);
if((len - willRead) > 1) {
i2cSetCmd(i2c, cmdIdx++, I2C_CMD_END, 0, false, false, false);
} else {
willRead++;
i2cSetCmd(i2c, cmdIdx++, I2C_CMD_READ, 1, true, false, false);
if(sendStop) {
i2cSetCmd(i2c, cmdIdx++, I2C_CMD_STOP, 0, false, false, false);
}
}
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//Clear Interrupts
i2c->dev->int_clr.val = 0xFFFFFFFF;
//START Transmission
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i2c->dev->ctr.trans_start = 1;
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//WAIT Transmission
while(1) {
//Bus failed (maybe check for this while waiting?
if(i2c->dev->int_raw.arbitration_lost) {
//log_e("Bus Fail! Addr: %x", address >> 1);
return -4;
}
//Bus timeout
if(i2c->dev->int_raw.time_out) {
//log_e("Bus Timeout! Addr: %x", address >> 1);
return -3;
}
//Transmission did not finish and ACK_ERR is set
if(i2c->dev->int_raw.ack_err) {
//log_e("Ack Error! Addr: %x", address >> 1);
return -1;
}
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if(i2c->dev->ctr.trans_start || i2c->dev->status_reg.bus_busy || !(i2c->dev->int_raw.trans_complete) || !(i2c->dev->command[cmdIdx-1].done)) {
continue;
} else if(i2c->dev->command[cmdIdx-1].done) {
break;
}
}
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int i = 0;
while(i<willRead) {
i++;
data[index++] = i2c->dev->fifo_data.data;
}
len -= willRead;
}
return 0;
}
void i2cResetFiFo(i2c_t * i2c)
{
//TX FIFO
i2c->dev->fifo_conf.tx_fifo_rst = 1;
i2c->dev->fifo_conf.tx_fifo_rst = 0;
//RX FIFO
i2c->dev->fifo_conf.rx_fifo_rst = 1;
i2c->dev->fifo_conf.rx_fifo_rst = 0;
}
void i2cSetFrequency(i2c_t * i2c, uint32_t clk_speed)
{
uint32_t period = (APB_CLK_FREQ/clk_speed) / 2;
i2c->dev->scl_low_period.scl_low_period = period;
i2c->dev->scl_high_period.period = period;
i2c->dev->scl_start_hold.time = 50;
i2c->dev->scl_rstart_setup.time = 50;
i2c->dev->scl_stop_hold.time = 50;
i2c->dev->scl_stop_setup.time = 50;
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i2c->dev->sda_hold.time = 25;
i2c->dev->sda_sample.time = 25;
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}
uint32_t i2cGetFrequency(i2c_t * i2c)
{
return APB_CLK_FREQ/(i2c->dev->scl_low_period.scl_low_period+i2c->dev->scl_high_period.period);
}
/*
* mode - 0 = Slave, 1 = Master
* slave_addr - I2C Address
* addr_10bit_en - enable slave 10bit address mode.
* */
i2c_t * i2cInit(uint8_t i2c_num, uint16_t slave_addr, bool addr_10bit_en)
{
i2c_t* i2c = (i2c_t*) malloc(sizeof(i2c_t));
if(i2c == 0) {
return NULL;
}
i2c->num = i2c_num;
i2c->dev = I2C_DEV(i2c_num);
if(i2c->num == 0) {
SET_PERI_REG_MASK(DPORT_PERIP_CLK_EN_REG,DPORT_I2C_EXT0_CLK_EN);
CLEAR_PERI_REG_MASK(DPORT_PERIP_RST_EN_REG,DPORT_I2C_EXT0_RST);
} else if(i2c->num == 1) {
SET_PERI_REG_MASK(DPORT_PERIP_CLK_EN_REG,DPORT_I2C_EXT1_CLK_EN);
CLEAR_PERI_REG_MASK(DPORT_PERIP_RST_EN_REG,DPORT_I2C_EXT1_RST);
}
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i2c->dev->ctr.val = 0;
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i2c->dev->ctr.ms_mode = (slave_addr == 0);
i2c->dev->ctr.sda_force_out = 1 ;
i2c->dev->ctr.scl_force_out = 1 ;
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i2c->dev->ctr.clk_en = 1;
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i2c->dev->timeout.tout = 2000;
i2c->dev->fifo_conf.nonfifo_en = 0;
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i2c->dev->slave_addr.val = 0;
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if (slave_addr) {
i2c->dev->slave_addr.addr = slave_addr;
i2c->dev->slave_addr.en_10bit = addr_10bit_en;
}
return i2c;
}