Diff: targets/hal/TARGET_STM/TARGET_NUCLEO_F401RE/i2c_api.c

Revision:

87:085cde657901

Child:

88:81f18c97d490

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_STM/TARGET_NUCLEO_F401RE/i2c_api.c	Sat Feb 08 19:45:06 2014 +0000
@@ -0,0 +1,272 @@
+/* mbed Microcontroller Library
+ *******************************************************************************
+ * Copyright (c) 2014, STMicroelectronics
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of STMicroelectronics nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS 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.
+ *******************************************************************************
+ */
+#include "i2c_api.h"
+
+#if DEVICE_I2C
+
+#include "cmsis.h"
+#include "pinmap.h"
+#include "error.h"
+#include "stm32f4xx_hal.h"
+
+/* Timeout values for flags and events waiting loops. These timeouts are
+   not based on accurate values, they just guarantee that the application will 
+   not remain stuck if the I2C communication is corrupted. */   
+#define FLAG_TIMEOUT ((int)0x1000)
+#define LONG_TIMEOUT ((int)0x8000)
+
+static const PinMap PinMap_I2C_SDA[] = {
+    {PB_9,  I2C_1, STM_PIN_DATA(GPIO_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
+    {NC,    NC,    0}
+};
+
+static const PinMap PinMap_I2C_SCL[] = {
+    {PB_8,  I2C_1, STM_PIN_DATA(GPIO_MODE_AF_OD, GPIO_NOPULL, GPIO_AF4_I2C1)},
+    {NC,    NC,    0}
+};
+
+I2C_HandleTypeDef I2cHandle;
+
+void i2c_init(i2c_t *obj, PinName sda, PinName scl) {  
+    // Determine the I2C to use
+    I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
+    I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
+
+    obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
+    
+    if (obj->i2c == (I2CName)NC) {
+        error("I2C error: pinout mapping failed.");
+    }
+
+    // Enable I2C clock
+    if (obj->i2c == I2C_1) {    
+        __I2C1_CLK_ENABLE();
+    }
+
+    // Configure I2C pins
+    pinmap_pinout(sda, PinMap_I2C_SDA);
+    pinmap_pinout(scl, PinMap_I2C_SCL);
+    pin_mode(sda, OpenDrain);
+    pin_mode(scl, OpenDrain);
+    
+    // Reset to clear pending flags if any
+    i2c_reset(obj);
+    
+    // I2C configuration
+    i2c_frequency(obj, 100000); // 100 kHz per default    
+}
+
+void i2c_frequency(i2c_t *obj, int hz) {
+    I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
+  
+    if ((hz != 0) && (hz <= 400000)) {
+        // I2C configuration      
+        I2cHandle.Init.AddressingMode  = I2C_ADDRESSINGMODE_7BIT;
+        I2cHandle.Init.ClockSpeed      = hz;
+        I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
+        I2cHandle.Init.DutyCycle       = I2C_DUTYCYCLE_2;
+        I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
+        I2cHandle.Init.NoStretchMode   = I2C_NOSTRETCH_DISABLED;
+        I2cHandle.Init.OwnAddress1     = 0;
+        I2cHandle.Init.OwnAddress2     = 0;
+        HAL_I2C_Init(&I2cHandle);    
+    }
+    else {
+        error("I2C error: frequency setting failed (max 400kHz).");
+    }
+}
+
+inline int i2c_start(i2c_t *obj) {
+    I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
+    int timeout;
+    
+    I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
+  
+    // Clear Acknowledge failure flag
+    __HAL_I2C_CLEAR_FLAG(&I2cHandle, I2C_FLAG_AF);
+  
+    // Generate the START condition
+    i2c->CR1 |= I2C_CR1_START;
+  
+    // Wait the START condition has been correctly sent
+    timeout = FLAG_TIMEOUT;
+    while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
+      if ((timeout--) == 0) {
+          return 1;
+      }
+    }
+    
+    return 0;
+}
+
+inline int i2c_stop(i2c_t *obj) {
+    I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
+  
+    // Generate the STOP condition
+    i2c->CR1 |= I2C_CR1_STOP;
+
+    return 0;
+}
+
+int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {  
+    if (length == 0) return 0;
+  
+    I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
+
+    // Reception process with 5 seconds timeout
+    if (HAL_I2C_Master_Receive(&I2cHandle, (uint16_t)address, (uint8_t *)data, length, 5000) != HAL_OK) {
+        return 0; // Error
+    }
+
+    return length;
+}
+
+int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
+    if (length == 0) return 0;
+  
+    I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
+
+    // Transmission process with 5 seconds timeout
+    if (HAL_I2C_Master_Transmit(&I2cHandle, (uint16_t)address, (uint8_t *)data, length, 5000) != HAL_OK) {
+        return 0; // Error
+    }
+    
+    return length;
+}
+
+int i2c_byte_read(i2c_t *obj, int last) {
+    I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
+    int timeout;
+  
+    if (last) {
+        // Don't acknowledge the last byte
+        i2c->CR1 &= ~I2C_CR1_ACK;
+    } else {
+        // Acknowledge the byte
+        i2c->CR1 |= I2C_CR1_ACK;
+    }
+
+    // Wait until the byte is received
+    timeout = FLAG_TIMEOUT;
+    while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_RXNE) == RESET) {
+      if ((timeout--) == 0) {
+          return 0;
+      }
+    }
+    
+    return (int)i2c->DR;
+}
+
+int i2c_byte_write(i2c_t *obj, int data) {
+    I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
+    int timeout;
+
+    i2c->DR = (uint8_t)data;
+
+    // Wait until the byte is transmitted
+    timeout = FLAG_TIMEOUT;  
+    while ((__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_TXE) == RESET) &&
+           (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_BTF) == RESET)) {
+        if ((timeout--) == 0) {
+            return 0;
+        }
+    }
+    
+    return 1;
+}
+
+void i2c_reset(i2c_t *obj) {
+    if (obj->i2c == I2C_1) {    
+        __I2C1_FORCE_RESET();
+        __I2C1_RELEASE_RESET();
+    }
+}
+
+#if DEVICE_I2CSLAVE
+
+void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
+    I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
+    uint16_t tmpreg;
+
+    // Get the old register value
+    tmpreg = i2c->OAR1;
+    // Reset address bits
+    tmpreg &= 0xFC00;
+    // Set new address
+    tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
+    // Store the new register value
+    i2c->OAR1 = tmpreg;
+}
+
+void i2c_slave_mode(i2c_t *obj, int enable_slave) {
+    // Nothing to do
+}
+
+// See I2CSlave.h
+#define NoData         0 // the slave has not been addressed
+#define ReadAddressed  1 // the master has requested a read from this slave (slave = transmitter)
+#define WriteGeneral   2 // the master is writing to all slave
+#define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
+
+int i2c_slave_receive(i2c_t *obj) {
+    // TO BE DONE
+    return(0);
+}
+
+int i2c_slave_read(i2c_t *obj, char *data, int length) {
+    if (length == 0) return 0;
+  
+    I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
+
+    // Reception process with 5 seconds timeout
+    if (HAL_I2C_Slave_Receive(&I2cHandle, (uint8_t *)data, length, 5000) != HAL_OK) {
+        return 0; // Error
+    }
+
+    return length;
+}
+
+int i2c_slave_write(i2c_t *obj, const char *data, int length) {
+    if (length == 0) return 0;
+  
+    I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
+
+    // Transmission process with 5 seconds timeout
+    if (HAL_I2C_Slave_Transmit(&I2cHandle, (uint8_t *)data, length, 5000) != HAL_OK) {
+        return 0; // Error
+    }
+
+    return length;
+}
+
+
+#endif // DEVICE_I2CSLAVE
+
+#endif // DEVICE_I2C