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implement thread-safe i2c

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This commit is contained in:
me-no-dev 2016-10-11 14:20:02 +03:00
parent 50b060ab32
commit 9ec4389889
2 changed files with 114 additions and 50 deletions
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156
cores/esp32/esp32-hal-i2c.c
View File

@ -15,42 +15,20 @@
#include "esp32-hal-i2c.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/semphr.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);
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);
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);
}
struct i2c_struct_t {
i2c_dev_t * dev;
xSemaphoreHandle lock;
uint8_t num;
};
enum {
I2C_CMD_RSTART,
@ -60,6 +38,62 @@ enum {
I2C_CMD_END
};
#define I2C_MUTEX_LOCK() do {} while (xSemaphoreTake(i2c->lock, portMAX_DELAY) != pdPASS)
#define I2C_MUTEX_UNLOCK() xSemaphoreGive(i2c->lock)
static i2c_t _i2c_bus_array[2] = {
{(volatile i2c_dev_t *)(DR_REG_I2C_EXT_BASE), NULL, 0},
{(volatile i2c_dev_t *)(DR_REG_I2C1_EXT_BASE), NULL, 1}
};
void i2cAttachSCL(i2c_t * i2c, int8_t scl)
{
if(i2c == NULL){
return;
}
I2C_MUTEX_LOCK();
pinMode(scl, OUTPUT);
pinMatrixOutAttach(scl, I2C_SCL_IDX(i2c->num), false, false);
pinMatrixInAttach(scl, I2C_SCL_IDX(i2c->num), false);
I2C_MUTEX_UNLOCK();
}
void i2cDetachSCL(i2c_t * i2c, int8_t scl)
{
if(i2c == NULL){
return;
}
I2C_MUTEX_LOCK();
pinMatrixOutDetach(scl, false, false);
pinMatrixInDetach(I2C_SCL_IDX(i2c->num), false, false);
pinMode(scl, INPUT);
I2C_MUTEX_UNLOCK();
}
void i2cAttachSDA(i2c_t * i2c, int8_t sda)
{
if(i2c == NULL){
return;
}
I2C_MUTEX_LOCK();
pinMode(sda, OUTPUT_OPEN_DRAIN);
pinMatrixOutAttach(sda, I2C_SDA_IDX(i2c->num), false, false);
pinMatrixInAttach(sda, I2C_SDA_IDX(i2c->num), false);
I2C_MUTEX_UNLOCK();
}
void i2cDetachSDA(i2c_t * i2c, int8_t sda)
{
if(i2c == NULL){
return;
}
I2C_MUTEX_LOCK();
pinMatrixOutDetach(sda, false, false);
pinMatrixInDetach(I2C_SDA_IDX(i2c->num), false, false);
pinMode(sda, INPUT);
I2C_MUTEX_UNLOCK();
}
/*
* index - command index (0 to 15)
* op_code - is the command
@ -78,6 +112,14 @@ void i2cSetCmd(i2c_t * i2c, uint8_t index, uint8_t op_code, uint8_t byte_num, bo
i2c->dev->command[index].op_code = op_code;
}
void i2cResetFiFo(i2c_t * i2c)
{
i2c->dev->fifo_conf.tx_fifo_rst = 1;
i2c->dev->fifo_conf.tx_fifo_rst = 0;
i2c->dev->fifo_conf.rx_fifo_rst = 1;
i2c->dev->fifo_conf.rx_fifo_rst = 0;
}
int i2cWrite(i2c_t * i2c, uint16_t address, bool addr_10bit, uint8_t * data, uint8_t len, bool sendStop)
{
int i;
@ -85,6 +127,12 @@ int i2cWrite(i2c_t * i2c, uint16_t address, bool addr_10bit, uint8_t * data, uin
uint8_t dataLen = len + (addr_10bit?2:1);
address = (address << 1);
if(i2c == NULL){
return 4;
}
I2C_MUTEX_LOCK();
while(dataLen) {
uint8_t willSend = (dataLen > 32)?32:dataLen;
uint8_t dataSend = willSend;
@ -129,18 +177,21 @@ int i2cWrite(i2c_t * i2c, uint16_t address, bool addr_10bit, uint8_t * data, uin
//Bus failed (maybe check for this while waiting?
if(i2c->dev->int_raw.arbitration_lost) {
//log_e("Bus Fail! Addr: %x", address >> 1);
I2C_MUTEX_UNLOCK();
return 4;
}
//Bus timeout
if(i2c->dev->int_raw.time_out) {
//log_e("Bus Timeout! Addr: %x", address >> 1);
I2C_MUTEX_UNLOCK();
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);
I2C_MUTEX_UNLOCK();
return 1;
}
@ -152,6 +203,7 @@ int i2cWrite(i2c_t * i2c, uint16_t address, bool addr_10bit, uint8_t * data, uin
}
}
I2C_MUTEX_UNLOCK();
return 0;
}
@ -163,6 +215,12 @@ int i2cRead(i2c_t * i2c, uint16_t address, bool addr_10bit, uint8_t * data, uint
uint8_t cmdIdx;
uint8_t willRead;
if(i2c == NULL){
return 4;
}
I2C_MUTEX_LOCK();
i2cResetFiFo(i2c);
//CMD START
@ -204,18 +262,21 @@ int i2cRead(i2c_t * i2c, uint16_t address, bool addr_10bit, uint8_t * data, uint
//Bus failed (maybe check for this while waiting?
if(i2c->dev->int_raw.arbitration_lost) {
//log_e("Bus Fail! Addr: %x", address >> 1);
I2C_MUTEX_UNLOCK();
return -4;
}
//Bus timeout
if(i2c->dev->int_raw.time_out) {
//log_e("Bus Timeout! Addr: %x", address >> 1);
I2C_MUTEX_UNLOCK();
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);
I2C_MUTEX_UNLOCK();
return -1;
}
if(i2c->dev->ctr.trans_start || i2c->dev->status_reg.bus_busy || !(i2c->dev->int_raw.trans_complete) || !(i2c->dev->command[cmdIdx-1].done)) {
@ -232,22 +293,19 @@ int i2cRead(i2c_t * i2c, uint16_t address, bool addr_10bit, uint8_t * data, uint
}
len -= willRead;
}
I2C_MUTEX_UNLOCK();
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;
if(i2c == NULL){
return;
}
I2C_MUTEX_LOCK();
i2c->dev->scl_low_period.scl_low_period = period;
i2c->dev->scl_high_period.period = period;
@ -259,10 +317,15 @@ void i2cSetFrequency(i2c_t * i2c, uint32_t clk_speed)
i2c->dev->sda_hold.time = 25;
i2c->dev->sda_sample.time = 25;
I2C_MUTEX_UNLOCK();
}
uint32_t i2cGetFrequency(i2c_t * i2c)
{
if(i2c == NULL){
return 0;
}
return APB_CLK_FREQ/(i2c->dev->scl_low_period.scl_low_period+i2c->dev->scl_high_period.period);
}
@ -274,18 +337,23 @@ uint32_t i2cGetFrequency(i2c_t * i2c)
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) {
if(i2c_num > 1){
return NULL;
}
i2c->num = i2c_num;
i2c->dev = I2C_DEV(i2c_num);
i2c_t * i2c = &_i2c_bus_array[i2c_num];
if(i2c->num == 0) {
if(i2c->lock == NULL){
i2c->lock = xSemaphoreCreateMutex();
if(i2c->lock == NULL) {
return NULL;
}
}
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) {
} else {
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);
}

8
cores/esp32/esp32-hal-i2c.h
View File

@ -22,18 +22,14 @@ extern "C" {
#include "esp32-hal.h"
#include "soc/i2c_struct.h"
typedef struct {
i2c_dev_t * dev;
uint8_t num;
} i2c_t;
struct i2c_struct_t;
typedef struct i2c_struct_t i2c_t;
i2c_t * i2cInit(uint8_t i2c_num, uint16_t slave_addr, bool addr_10bit_en);
void i2cSetFrequency(i2c_t * i2c, uint32_t clk_speed);
uint32_t i2cGetFrequency(i2c_t * i2c);
void i2cResetFiFo(i2c_t * i2c);
void i2cAttachSCL(i2c_t * i2c, int8_t scl);
void i2cDetachSCL(i2c_t * i2c, int8_t scl);
void i2cAttachSDA(i2c_t * i2c, int8_t sda);