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- /*
- * ESPRSSIF MIT License
- *
- * Copyright (c) 2016 <ESPRESSIF SYSTEMS (SHANGHAI) PTE LTD>
- *
- * Permission is hereby granted for use on ESPRESSIF SYSTEMS ESP8266 only, in which case,
- * it is 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 THE AUTHORS OR
- * COPYRIGHT HOLDERS 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.
- *
- */
- #include "ets_sys.h"
- #include "osapi.h"
- #include "gpio.h"
- #include "driver/i2c_master.h"
- LOCAL uint8 m_nLastSDA;
- LOCAL uint8 m_nLastSCL;
- /******************************************************************************
- * FunctionName : i2c_master_setDC
- * Description : Internal used function -
- * set i2c SDA and SCL bit value for half clk cycle
- * Parameters : uint8 SDA
- * uint8 SCL
- * Returns : NONE
- *******************************************************************************/
- LOCAL void ICACHE_FLASH_ATTR
- i2c_master_setDC(uint8 SDA, uint8 SCL)
- {
- SDA &= 0x01;
- SCL &= 0x01;
- m_nLastSDA = SDA;
- m_nLastSCL = SCL;
- if ((0 == SDA) && (0 == SCL)) {
- I2C_MASTER_SDA_LOW_SCL_LOW();
- } else if ((0 == SDA) && (1 == SCL)) {
- I2C_MASTER_SDA_LOW_SCL_HIGH();
- } else if ((1 == SDA) && (0 == SCL)) {
- I2C_MASTER_SDA_HIGH_SCL_LOW();
- } else {
- I2C_MASTER_SDA_HIGH_SCL_HIGH();
- }
- }
- /******************************************************************************
- * FunctionName : i2c_master_getDC
- * Description : Internal used function -
- * get i2c SDA bit value
- * Parameters : NONE
- * Returns : uint8 - SDA bit value
- *******************************************************************************/
- LOCAL uint8 ICACHE_FLASH_ATTR
- i2c_master_getDC(void)
- {
- uint8 sda_out;
- sda_out = GPIO_INPUT_GET(GPIO_ID_PIN(I2C_MASTER_SDA_GPIO));
- return sda_out;
- }
- /******************************************************************************
- * FunctionName : i2c_master_init
- * Description : initilize I2C bus to enable i2c operations
- * Parameters : NONE
- * Returns : NONE
- *******************************************************************************/
- void ICACHE_FLASH_ATTR
- i2c_master_init(void)
- {
- uint8 i;
- i2c_master_setDC(1, 0);
- i2c_master_wait(5);
- // when SCL = 0, toggle SDA to clear up
- i2c_master_setDC(0, 0) ;
- i2c_master_wait(5);
- i2c_master_setDC(1, 0) ;
- i2c_master_wait(5);
- // set data_cnt to max value
- for (i = 0; i < 28; i++) {
- i2c_master_setDC(1, 0);
- i2c_master_wait(5); // sda 1, scl 0
- i2c_master_setDC(1, 1);
- i2c_master_wait(5); // sda 1, scl 1
- }
- // reset all
- i2c_master_stop();
- return;
- }
- /******************************************************************************
- * FunctionName : i2c_master_gpio_init
- * Description : config SDA and SCL gpio to open-drain output mode,
- * mux and gpio num defined in i2c_master.h
- * Parameters : NONE
- * Returns : NONE
- *******************************************************************************/
- void ICACHE_FLASH_ATTR
- i2c_master_gpio_init(void)
- {
- ETS_GPIO_INTR_DISABLE() ;
- // ETS_INTR_LOCK();
- PIN_FUNC_SELECT(I2C_MASTER_SDA_MUX, I2C_MASTER_SDA_FUNC);
- PIN_FUNC_SELECT(I2C_MASTER_SCL_MUX, I2C_MASTER_SCL_FUNC);
- GPIO_REG_WRITE(GPIO_PIN_ADDR(GPIO_ID_PIN(I2C_MASTER_SDA_GPIO)), GPIO_REG_READ(GPIO_PIN_ADDR(GPIO_ID_PIN(I2C_MASTER_SDA_GPIO))) | GPIO_PIN_PAD_DRIVER_SET(GPIO_PAD_DRIVER_ENABLE)); //open drain;
- GPIO_REG_WRITE(GPIO_ENABLE_ADDRESS, GPIO_REG_READ(GPIO_ENABLE_ADDRESS) | (1 << I2C_MASTER_SDA_GPIO));
- GPIO_REG_WRITE(GPIO_PIN_ADDR(GPIO_ID_PIN(I2C_MASTER_SCL_GPIO)), GPIO_REG_READ(GPIO_PIN_ADDR(GPIO_ID_PIN(I2C_MASTER_SCL_GPIO))) | GPIO_PIN_PAD_DRIVER_SET(GPIO_PAD_DRIVER_ENABLE)); //open drain;
- GPIO_REG_WRITE(GPIO_ENABLE_ADDRESS, GPIO_REG_READ(GPIO_ENABLE_ADDRESS) | (1 << I2C_MASTER_SCL_GPIO));
- I2C_MASTER_SDA_HIGH_SCL_HIGH();
- ETS_GPIO_INTR_ENABLE() ;
- // ETS_INTR_UNLOCK();
- i2c_master_init();
- }
- /******************************************************************************
- * FunctionName : i2c_master_start
- * Description : set i2c to send state
- * Parameters : NONE
- * Returns : NONE
- *******************************************************************************/
- void ICACHE_FLASH_ATTR
- i2c_master_start(void)
- {
- i2c_master_setDC(1, m_nLastSCL);
- i2c_master_wait(5);
- i2c_master_setDC(1, 1);
- i2c_master_wait(5); // sda 1, scl 1
- i2c_master_setDC(0, 1);
- i2c_master_wait(5); // sda 0, scl 1
- }
- /******************************************************************************
- * FunctionName : i2c_master_stop
- * Description : set i2c to stop sending state
- * Parameters : NONE
- * Returns : NONE
- *******************************************************************************/
- void ICACHE_FLASH_ATTR
- i2c_master_stop(void)
- {
- i2c_master_wait(5);
- i2c_master_setDC(0, m_nLastSCL);
- i2c_master_wait(5); // sda 0
- i2c_master_setDC(0, 1);
- i2c_master_wait(5); // sda 0, scl 1
- i2c_master_setDC(1, 1);
- i2c_master_wait(5); // sda 1, scl 1
- }
- /******************************************************************************
- * FunctionName : i2c_master_setAck
- * Description : set ack to i2c bus as level value
- * Parameters : uint8 level - 0 or 1
- * Returns : NONE
- *******************************************************************************/
- void ICACHE_FLASH_ATTR
- i2c_master_setAck(uint8 level)
- {
- i2c_master_setDC(m_nLastSDA, 0);
- i2c_master_wait(5);
- i2c_master_setDC(level, 0);
- i2c_master_wait(5); // sda level, scl 0
- i2c_master_setDC(level, 1);
- i2c_master_wait(8); // sda level, scl 1
- i2c_master_setDC(level, 0);
- i2c_master_wait(5); // sda level, scl 0
- i2c_master_setDC(1, 0);
- i2c_master_wait(5);
- }
- /******************************************************************************
- * FunctionName : i2c_master_getAck
- * Description : confirm if peer send ack
- * Parameters : NONE
- * Returns : uint8 - ack value, 0 or 1
- *******************************************************************************/
- uint8 ICACHE_FLASH_ATTR
- i2c_master_getAck(void)
- {
- uint8 retVal;
- i2c_master_setDC(m_nLastSDA, 0);
- i2c_master_wait(5);
- i2c_master_setDC(1, 0);
- i2c_master_wait(5);
- i2c_master_setDC(1, 1);
- i2c_master_wait(5);
- retVal = i2c_master_getDC();
- i2c_master_wait(5);
- i2c_master_setDC(1, 0);
- i2c_master_wait(5);
- return retVal;
- }
- /******************************************************************************
- * FunctionName : i2c_master_checkAck
- * Description : get dev response
- * Parameters : NONE
- * Returns : true : get ack ; false : get nack
- *******************************************************************************/
- bool ICACHE_FLASH_ATTR
- i2c_master_checkAck(void)
- {
- if(i2c_master_getAck()){
- return FALSE;
- }else{
- return TRUE;
- }
- }
- /******************************************************************************
- * FunctionName : i2c_master_send_ack
- * Description : response ack
- * Parameters : NONE
- * Returns : NONE
- *******************************************************************************/
- void ICACHE_FLASH_ATTR
- i2c_master_send_ack(void)
- {
- i2c_master_setAck(0x0);
- }
- /******************************************************************************
- * FunctionName : i2c_master_send_nack
- * Description : response nack
- * Parameters : NONE
- * Returns : NONE
- *******************************************************************************/
- void ICACHE_FLASH_ATTR
- i2c_master_send_nack(void)
- {
- i2c_master_setAck(0x1);
- }
- /******************************************************************************
- * FunctionName : i2c_master_readByte
- * Description : read Byte from i2c bus
- * Parameters : NONE
- * Returns : uint8 - readed value
- *******************************************************************************/
- uint8 ICACHE_FLASH_ATTR
- i2c_master_readByte(void)
- {
- uint8 retVal = 0;
- uint8 k, i;
- i2c_master_wait(5);
- i2c_master_setDC(m_nLastSDA, 0);
- i2c_master_wait(5); // sda 1, scl 0
- for (i = 0; i < 8; i++) {
- i2c_master_wait(5);
- i2c_master_setDC(1, 0);
- i2c_master_wait(5); // sda 1, scl 0
- i2c_master_setDC(1, 1);
- i2c_master_wait(5); // sda 1, scl 1
- k = i2c_master_getDC();
- i2c_master_wait(5);
- if (i == 7) {
- i2c_master_wait(3); ////
- }
- k <<= (7 - i);
- retVal |= k;
- }
- i2c_master_setDC(1, 0);
- i2c_master_wait(5); // sda 1, scl 0
- return retVal;
- }
- /******************************************************************************
- * FunctionName : i2c_master_writeByte
- * Description : write wrdata value(one byte) into i2c
- * Parameters : uint8 wrdata - write value
- * Returns : NONE
- *******************************************************************************/
- void ICACHE_FLASH_ATTR
- i2c_master_writeByte(uint8 wrdata)
- {
- uint8 dat;
- sint8 i;
- i2c_master_wait(5);
- i2c_master_setDC(m_nLastSDA, 0);
- i2c_master_wait(5);
- for (i = 7; i >= 0; i--) {
- dat = wrdata >> i;
- i2c_master_setDC(dat, 0);
- i2c_master_wait(5);
- i2c_master_setDC(dat, 1);
- i2c_master_wait(5);
- if (i == 0) {
- i2c_master_wait(3); ////
- }
- i2c_master_setDC(dat, 0);
- i2c_master_wait(5);
- }
- }
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