/***************************************************************************** * Copyright (c) 2019, Nations Technologies Inc. * * All rights reserved. * **************************************************************************** * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * - Redistributions of source code must retain the above copyright notice, * this list of conditions and the disclaimer below. * * Nations' name may not be used to endorse or promote products derived from * this software without specific prior written permission. * * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY NATIONS "AS IS" AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE * DISCLAIMED. IN NO EVENT SHALL NATIONS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /** * @file drv_i2c.c * @author Nations * @version v1.0.0 * * @copyright Copyright (c) 2019, Nations Technologies Inc. All rights reserved. */ #include #include #include "drv_i2c.h" #include "board.h" #ifdef RT_USING_I2C #include #define DBG_TAG "drv.I2C" #ifdef RT_I2C_DEBUG #define DBG_LVL DBG_LOG #else #define DBG_LVL DBG_INFO #endif #include #define I2CT_FLAG_TIMEOUT ((uint32_t)0x1000) #define I2CT_LONG_TIMEOUT ((uint32_t)(10 * I2CT_FLAG_TIMEOUT)) #ifdef RT_USING_I2C_BITOPS /*user can change this*/ #define I2C_BUS_NAME "i2c1" /*user should change this to adapt specific board*/ #define I2C_SCL_PIN GPIO_PIN_8 #define I2C_SCL_PORT GPIOB #define I2C_SCL_CLK RCC_APB2_PERIPH_GPIOB #define I2C_SDA_PIN GPIO_PIN_9 #define I2C_SDA_PORT GPIOB #define I2C_SDA_CLK RCC_APB2_PERIPH_GPIOB struct n32_i2c_bit_data { struct { rt_uint32_t clk; GPIO_Module* port; rt_uint32_t pin; }scl, sda; }; static void gpio_set_sda(void *data, rt_int32_t state) { struct n32_i2c_bit_data* bd = data; if (state) { GPIO_SetBits((GPIO_Module*)bd->sda.port, bd->sda.pin); } else { GPIO_ResetBits((GPIO_Module*)bd->sda.port, bd->sda.pin); } } static void gpio_set_scl(void *data, rt_int32_t state) { struct n32_i2c_bit_data* bd = data; if (state) { GPIO_SetBits((GPIO_Module*)bd->scl.port, bd->scl.pin); } else { GPIO_ResetBits((GPIO_Module*)bd->scl.port, bd->scl.pin); } } static rt_int32_t gpio_get_sda(void *data) { struct n32_i2c_bit_data* bd = data; return GPIO_ReadInputDataBit((GPIO_Module*)bd->sda.port, bd->sda.pin); } static rt_int32_t gpio_get_scl(void *data) { struct n32_i2c_bit_data* bd = data; return GPIO_ReadInputDataBit((GPIO_Module*)bd->scl.port, bd->scl.pin); } static void gpio_udelay(rt_uint32_t us) { RCC_ClocksType* RCC_Clocks = {0}; RCC_GetClocksFreqValue(RCC_Clocks); int i = ( RCC_Clocks->SysclkFreq / 4000000 * us); while(i) { i--; } } static void drv_i2c_gpio_init(const struct n32_i2c_bit_data* bd) { RCC_EnableAPB2PeriphClk(bd->sda.clk | bd->scl.clk, ENABLE); GPIOInit((GPIO_Module*)bd->sda.port, GPIO_Mode_Out_OD, GPIO_Speed_10MHz, bd->sda.pin); GPIOInit((GPIO_Module*)bd->scl.port, GPIO_Mode_Out_OD, GPIO_Speed_10MHz, bd->scl.pin); GPIO_SetBits((GPIO_Module*)bd->sda.port, bd->sda.pin); GPIO_SetBits((GPIO_Module*)bd->scl.port, bd->scl.pin); } #else /* use hardware i2c */ static uint32_t I2CTimeout = I2CT_LONG_TIMEOUT; static int rt_i2c_read(rt_uint32_t i2c_periph, rt_uint16_t slave_address, rt_uint8_t* p_buffer, rt_uint16_t data_byte) { I2CTimeout = I2CT_LONG_TIMEOUT; /* wait until I2C bus is idle */ while(I2C_GetFlag((I2C_Module*)i2c_periph, I2C_FLAG_BUSY)) { if ((I2CTimeout--) == 0) return 9; }; I2C_ConfigAck((I2C_Module*)i2c_periph, ENABLE); /** Send START condition */ I2C_GenerateStart((I2C_Module*)i2c_periph, ENABLE); I2CTimeout = I2CT_LONG_TIMEOUT; /* wait until SBSEND bit is set */ while (!I2C_CheckEvent((I2C_Module*)i2c_periph, I2C_EVT_MASTER_MODE_FLAG)) // EV5 { if ((I2CTimeout--) == 0) return 10; }; /* send slave address to I2C bus */ I2C_SendAddr7bit((I2C_Module*)i2c_periph, slave_address, I2C_DIRECTION_RECV); I2CTimeout = I2CT_LONG_TIMEOUT; while (!I2C_CheckEvent((I2C_Module*)i2c_periph, I2C_EVT_MASTER_RXMODE_FLAG)) // EV6 { if ((I2CTimeout--) == 0) return 6; }; // /* clear the ADDSEND bit */ // I2C_ClrFlag((I2C_Module*)i2c_periph,I2C_FLAG_ADDRF); // if(1 == data_byte){ // /* disable acknowledge */ // I2C_ConfigAck((I2C_Module*)i2c_periph,DISABLE); // /* send a stop condition to I2C bus */ // I2C_GenerateStop(I2C1, ENABLE); // } /* while there is data to be read */ while(data_byte) { /* wait until the RBNE bit is set and clear it */ if(I2C_GetFlag((I2C_Module*)i2c_periph, I2C_FLAG_RXDATNE)) { /* read a byte*/ *p_buffer = I2C_RecvData((I2C_Module*)i2c_periph); /* point to the next location where the byte read will be saved */ p_buffer++; /* decrement the read bytes counter */ data_byte--; if(1 == data_byte) { /* disable acknowledge */ I2C_ConfigAck((I2C_Module*)i2c_periph, DISABLE); /* send a stop condition to I2C bus */ I2C_GenerateStop((I2C_Module*)i2c_periph, ENABLE); } } } /* wait until the stop condition is finished */ while(I2C_GetFlag((I2C_Module*)i2c_periph, I2C_FLAG_STOPF)) { if ((I2CTimeout--) == 0) return 7; }; /* enable acknowledge */ I2C_ConfigAck((I2C_Module*)i2c_periph, ENABLE); I2C_ConfigNackLocation((I2C_Module*)i2c_periph,I2C_NACK_POS_CURRENT); return 0; } static int rt_i2c_write(rt_uint32_t i2c_periph, uint16_t slave_address, uint8_t* p_buffer, uint16_t data_byte) { uint8_t* sendBufferPtr = p_buffer; I2CTimeout = I2CT_LONG_TIMEOUT; while (I2C_GetFlag((I2C_Module*)i2c_periph, I2C_FLAG_BUSY)) { if ((I2CTimeout--) == 0) return 4; }; I2C_ConfigAck((I2C_Module*)i2c_periph, ENABLE); I2C_GenerateStart((I2C_Module*)i2c_periph, ENABLE); I2CTimeout = I2CT_LONG_TIMEOUT; while (!I2C_CheckEvent((I2C_Module*)i2c_periph, I2C_EVT_MASTER_MODE_FLAG)) // EV5 { if ((I2CTimeout--) == 0) return 5; }; I2C_SendAddr7bit((I2C_Module*)i2c_periph, slave_address, I2C_DIRECTION_SEND); I2CTimeout = I2CT_LONG_TIMEOUT; while (!I2C_CheckEvent((I2C_Module*)i2c_periph, I2C_EVT_MASTER_TXMODE_FLAG)) // EV6 { if ((I2CTimeout--) == 0) return 6; }; // send data while (data_byte-- > 0) { I2C_SendData((I2C_Module*)i2c_periph, *sendBufferPtr++); I2CTimeout = I2CT_LONG_TIMEOUT; while (!I2C_CheckEvent((I2C_Module*)i2c_periph, I2C_EVT_MASTER_DATA_SENDING)) // EV8 { if ((I2CTimeout--) == 0) return 7; }; }; I2CTimeout = I2CT_LONG_TIMEOUT; while (!I2C_CheckEvent((I2C_Module*)i2c_periph, I2C_EVT_MASTER_DATA_SENDED)) // EV8-2 { if ((I2CTimeout--) == 0) return 8; }; I2C_GenerateStop((I2C_Module*)i2c_periph, ENABLE); return 0; } static rt_size_t rt_i2c_xfer(struct rt_i2c_bus_device *bus, struct rt_i2c_msg msgs[], rt_uint32_t num) { struct rt_i2c_msg *msg; rt_uint32_t i; rt_err_t ret = RT_ERROR; struct rt_i2c_bus *rt_i2c = (struct rt_i2c_bus *)bus; for (i = 0; i < num; i++) { msg = &msgs[i]; if (msg->flags & RT_I2C_RD) { if (rt_i2c_read(rt_i2c->i2c_periph, msg->addr, msg->buf, msg->len) != 0) { LOG_E("i2c bus write failed,i2c bus stop!"); goto out; } } else { if (rt_i2c_write(rt_i2c->i2c_periph, msg->addr, msg->buf, msg->len) != 0) { LOG_E("i2c bus write failed,i2c bus stop!"); goto out; } } } ret = i; return ret; out: LOG_E("send stop condition\n"); return ret; } static const struct rt_i2c_bus_device_ops i2c_ops = { rt_i2c_xfer, RT_NULL, RT_NULL }; #endif /* RT_USING_I2C_BITOPS */ int rt_hw_i2c_init(void) { #ifdef RT_USING_I2C_BITOPS { static struct rt_i2c_bus_device i2c_device; static const struct n32_i2c_bit_data _i2c_bdata = { /* SCL */ { I2C_SCL_CLK, I2C_SCL_PORT, I2C_SCL_PIN}, /* SDA */ { I2C_SDA_CLK, I2C_SDA_PORT, I2C_SDA_PIN}, }; static const struct rt_i2c_bit_ops _i2c_bit_ops = { (void*)&_i2c_bdata, gpio_set_sda, gpio_set_scl, gpio_get_sda, gpio_get_scl, gpio_udelay, 1, 100 }; drv_i2c_gpio_init(&_i2c_bdata); i2c_device.priv = (void *)&_i2c_bit_ops; rt_i2c_bit_add_bus(&i2c_device, I2C_BUS_NAME); } #else /* register hardware I2C */ #ifdef BSP_USING_I2C1 #define I2C1_SPEED 400000 static struct rt_i2c_bus i2c_bus1; I2C_InitType I2C_InitStructure; RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_AFIO, ENABLE); GPIO_ConfigPinRemap(GPIO_RMP_I2C1, ENABLE); /* connect PB8 to I2C1_SCL, PB9 to I2C1_SDA */ GPIOInit(GPIOB, GPIO_Mode_AF_OD, GPIO_Speed_50MHz, GPIO_PIN_8 | GPIO_PIN_9); /* enable I2C clock */ RCC_EnableAPB1PeriphClk(RCC_APB1_PERIPH_I2C1, ENABLE); I2C_DeInit(I2C1); I2C_InitStructure.BusMode = I2C_BUSMODE_I2C; I2C_InitStructure.FmDutyCycle = I2C_FMDUTYCYCLE_2; I2C_InitStructure.OwnAddr1 = 0xff; I2C_InitStructure.AckEnable = I2C_ACKEN; I2C_InitStructure.AddrMode = I2C_ADDR_MODE_7BIT; I2C_InitStructure.ClkSpeed = I2C1_SPEED; // 400000 400K I2C_Init(I2C1, &I2C_InitStructure); rt_memset((void *)&i2c_bus1, 0, sizeof(struct rt_i2c_bus)); i2c_bus1.parent.ops = &i2c_ops; i2c_bus1.i2c_periph = (rt_uint32_t)I2C1; rt_i2c_bus_device_register(&i2c_bus1.parent, "i2c1"); #endif #ifdef BSP_USING_I2C2 #define I2C2_SPEED 100000 static struct rt_i2c_bus i2c_bus2; I2C_InitType I2C_InitStructure; /* enable I2C clock */ RCC_EnableAPB1PeriphClk(RCC_APB1_PERIPH_I2C2, ENABLE); RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_AFIO, ENABLE); /* connect PB10 to I2C2_SCL, PB11 to I2C2_SDA */ GPIOInit(GPIOB, GPIO_Mode_AF_OD, GPIO_Speed_50MHz, GPIO_PIN_10 | GPIO_PIN_11); I2C_DeInit(I2C2); I2C_InitStructure.BusMode = I2C_BUSMODE_I2C; I2C_InitStructure.FmDutyCycle = I2C_FMDUTYCYCLE_2; I2C_InitStructure.OwnAddr1 = 0xff; I2C_InitStructure.AckEnable = I2C_ACKEN; I2C_InitStructure.AddrMode = I2C_ADDR_MODE_7BIT; I2C_InitStructure.ClkSpeed = I2C2_SPEED; // 100000 100K I2C_Init(I2C2, &I2C_InitStructure); rt_memset((void *)&i2c_bus2, 0, sizeof(struct rt_i2c_bus)); i2c_bus2.parent.ops = &i2c_ops; i2c_bus2.i2c_periph = (rt_uint32_t)I2C2; rt_i2c_bus_device_register(&i2c_bus2.parent, "i2c2"); #endif #ifdef BSP_USING_I2C3 #define I2C3_SPEED 100000 static struct rt_i2c_bus i2c_bus3; I2C_InitType I2C_InitStructure; /* enable I2C clock */ RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_I2C3, ENABLE); RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_AFIO, ENABLE); /* connect PC0 to I2C3_SCL, PC1 to I2C3_SDA */ GPIOInit(GPIOC, GPIO_Mode_AF_OD, GPIO_Speed_50MHz, GPIO_PIN_0 | GPIO_PIN_1); I2C_DeInit(I2C3); I2C_InitStructure.BusMode = I2C_BUSMODE_I2C; I2C_InitStructure.FmDutyCycle = I2C_FMDUTYCYCLE_2; I2C_InitStructure.OwnAddr1 = 0xff; I2C_InitStructure.AckEnable = I2C_ACKEN; I2C_InitStructure.AddrMode = I2C_ADDR_MODE_7BIT; I2C_InitStructure.ClkSpeed = I2C3_SPEED; // 100000 100K I2C_Init(I2C3, &I2C_InitStructure); rt_memset((void *)&i2c_bus3, 0, sizeof(struct rt_i2c_bus)); i2c_bus3.parent.ops = &i2c_ops; i2c_bus3.i2c_periph = (rt_uint32_t)I2C3; rt_i2c_bus_device_register(&i2c_bus3.parent, "i2c3"); #endif #ifdef BSP_USING_I2C4 #define I2C4_SPEED 100000 static struct rt_i2c_bus i2c_bus4; I2C_InitType I2C_InitStructure; /* enable I2C clock */ RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_I2C4, ENABLE); RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_AFIO, ENABLE); /* connect PC6 to I2C4_SCL, PC7 to I2C4_SDA */ GPIOInit(GPIOC, GPIO_Mode_AF_OD, GPIO_Speed_50MHz, GPIO_PIN_6 | GPIO_PIN_7); I2C_DeInit(I2C4); I2C_InitStructure.BusMode = I2C_BUSMODE_I2C; I2C_InitStructure.FmDutyCycle = I2C_FMDUTYCYCLE_2; I2C_InitStructure.OwnAddr1 = 0xff; I2C_InitStructure.AckEnable = I2C_ACKEN; I2C_InitStructure.AddrMode = I2C_ADDR_MODE_7BIT; I2C_InitStructure.ClkSpeed = I2C4_SPEED; // 100000 100K I2C_Init(I2C4, &I2C_InitStructure); rt_memset((void *)&i2c_bus4, 0, sizeof(struct rt_i2c_bus)); i2c_bus4.parent.ops = &i2c_ops; i2c_bus4.i2c_periph = (rt_uint32_t)I2C4; rt_i2c_bus_device_register(&i2c_bus4.parent, "i2c4"); #endif #endif /* RT_USING_I2C_BITOPS */ return 0; } INIT_DEVICE_EXPORT(rt_hw_i2c_init); #endif /* end of i2c driver */