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annotate libs/STM32F10x_StdPeriph_Lib_V3.5.0/Project/STM32F10x_StdPeriph_Examples/I2C/EEPROM/main.c @ 55:b21db2b47a27

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Enable DMA mode by initing DMA channel and enabling IRQ handler.
author Daniel O'Connor <darius@dons.net.au>
date Sun, 07 Apr 2013 22:34:05 +0930
parents c59513fd84fb
children
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1 /**
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2 ******************************************************************************
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3 * @file I2C/EEPROM/main.c
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4 * @author MCD Application Team
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5 * @version V3.5.0
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6 * @date 08-April-2011
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7 * @brief Main program body
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8 ******************************************************************************
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9 * @attention
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10 *
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11 * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
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12 * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
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13 * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
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14 * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
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15 * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
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16 * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
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17 *
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18 * <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>
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19 ******************************************************************************
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20 */
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21
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22 /* Includes ------------------------------------------------------------------*/
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23 #include "stm32_eval_i2c_ee.h"
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24
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25
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26 #ifdef USE_STM3210E_EVAL
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27 #include "stm3210e_eval_lcd.h"
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28 #elif defined(USE_STM3210B_EVAL)
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29 #include "stm3210b_eval_lcd.h"
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30 #elif defined(USE_STM3210C_EVAL)
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31 #include "stm3210c_eval_lcd.h"
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32 #elif defined(USE_STM32100B_EVAL)
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33 #include "stm32100b_eval_lcd.h"
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34 #elif defined(USE_STM32100E_EVAL)
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35 #include "stm32100e_eval_lcd.h"
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36 #endif /* USE_STM3210E_EVAL */
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37
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38 /** @addtogroup STM32F10x_StdPeriph_Examples
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39 * @{
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40 */
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41
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42 /** @addtogroup I2C_EEPROM
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43 * @{
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44 */
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45
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46 /* Private typedef -----------------------------------------------------------*/
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47 typedef enum {FAILED = 0, PASSED = !FAILED} TestStatus;
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48
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49 /* Private define ------------------------------------------------------------*/
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50 /* Uncomment the following line to enable using LCD screen for messages display */
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51 #define ENABLE_LCD_MSG_DISPLAY
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52
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53 #define sEE_WRITE_ADDRESS1 0x50
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54 #define sEE_READ_ADDRESS1 0x50
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55 #define BUFFER_SIZE1 (countof(Tx1_Buffer)-1)
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56 #define BUFFER_SIZE2 (countof(Tx2_Buffer)-1)
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57 #define sEE_WRITE_ADDRESS2 (sEE_WRITE_ADDRESS1 + BUFFER_SIZE1)
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58 #define sEE_READ_ADDRESS2 (sEE_READ_ADDRESS1 + BUFFER_SIZE1)
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59
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60 /* Private macro -------------------------------------------------------------*/
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61 #define countof(a) (sizeof(a) / sizeof(*(a)))
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62
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63 /* Private variables ---------------------------------------------------------*/
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64 uint8_t Tx1_Buffer[] = "/* STM32F10xx I2C Firmware Library EEPROM driver example: \
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65 buffer 1 transfer into address sEE_WRITE_ADDRESS1 */ \
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66 Example Description \
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67 This firmware provides a basic example of how to use the I2C firmware library and\
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68 an associate I2C EEPROM driver to communicate with an I2C EEPROM device (here the\
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69 example is interfacing with M24C64 EEPROM)\
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70 \
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71 I2C peripheral is configured in Master transmitter during write operation and in\
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72 Master receiver during read operation from I2C EEPROM. \
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73 \
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74 The peripheral used is I2C1 but can be configured by modifying the defines values\
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75 in stm32xxxx_eval.h file. The speed is set to 200kHz and can be configured by \
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76 modifying the relative define in stm32_eval_i2c_ee.h file.\
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77 \
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78 For M24C64 devices all the memory is accessible through the two-bytes \
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79 addressing mode and need to define block addresses. In this case, only the physical \
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80 address has to be defined (according to the address pins (E0,E1 and E2) connection).\
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81 This address is defined in i2c_ee.h (default is 0xA0: E0, E1 and E2 tied to ground).\
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82 The EEPROM addresses where the program start the write and the read operations \
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83 is defined in the main.c file. \
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84 \
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85 First, the content of Tx1_Buffer is written to the EEPROM_WriteAddress1 and the\
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86 written data are read. The written and the read buffers data are then compared.\
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87 Following the read operation, the program waits that the EEPROM reverts to its \
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88 Standby state. A second write operation is, then, performed and this time, Tx2_Buffer\
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89 is written to EEPROM_WriteAddress2, which represents the address just after the last \
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90 written one in the first write. After completion of the second write operation, the \
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91 written data are read. The contents of the written and the read buffers are compared.\
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92 \
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93 All transfers are managed in DMA mode (except when 1-byte read/write operation is\
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94 required). Once sEE_ReadBuffer() or sEE_WriteBuffer() function is called, the \
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95 use application may perform other tasks in parallel while Read/Write operation is\
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96 managed by DMA.\
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97 \
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98 This example provides the possibility to use the STM32XXXX-EVAL LCD screen for\
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99 messages display (transfer status: Ongoing, PASSED, FAILED).\
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100 To enable this option uncomment the define ENABLE_LCD_MSG_DISPLAY in the main.c\
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101 file. ";
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102 uint8_t Tx2_Buffer[] = "/* STM32F10xx I2C Firmware Library EEPROM driver example: \
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103 buffer 2 transfer into address sEE_WRITE_ADDRESS2 */";
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104 uint8_t Rx1_Buffer[BUFFER_SIZE1], Rx2_Buffer[BUFFER_SIZE2];
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105 volatile TestStatus TransferStatus1 = FAILED, TransferStatus2 = FAILED;
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106 volatile uint16_t NumDataRead = 0;
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107
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108 /* Private functions ---------------------------------------------------------*/
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109 TestStatus Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength);
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110
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111 /**
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112 * @brief Main program
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113 * @param None
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114 * @retval None
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115 */
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116 int main(void)
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117 {
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118 /*!< At this stage the microcontroller clock setting is already configured,
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119 this is done through SystemInit() function which is called from startup
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120 file (startup_stm32f10x_xx.s) before to branch to application main.
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121 To reconfigure the default setting of SystemInit() function, refer to
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122 system_stm32f10x.c file
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123 */
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124
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125 #ifdef ENABLE_LCD_MSG_DISPLAY
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126 /* Initialize the LCD screen for information display */
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127 #ifdef USE_STM3210E_EVAL
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128 STM3210E_LCD_Init();
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129 #elif defined(USE_STM3210B_EVAL)
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130 STM3210B_LCD_Init();
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131 #elif defined(USE_STM3210C_EVAL)
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132 STM3210C_LCD_Init();
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133 #elif defined(USE_STM32100B_EVAL)
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134 STM32100B_LCD_Init();
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135 #elif defined(USE_STM32100E_EVAL)
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136 STM32100E_LCD_Init();
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137 #endif /* USE_STM3210E_EVAL */
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138
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139 /* Display application information */
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140 LCD_Clear(LCD_COLOR_BLUE);
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141 LCD_SetBackColor(LCD_COLOR_BLUE);
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142 LCD_SetTextColor(LCD_COLOR_WHITE);
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143 LCD_DisplayStringLine(LCD_LINE_0, "SMT32F1xx FW Library");
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144 LCD_DisplayStringLine(LCD_LINE_1, " EEPROM Example ");
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145 #endif /* ENABLE_LCD_MSG_DISPLAY */
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146
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147 /* Initialize the I2C EEPROM driver ----------------------------------------*/
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148 sEE_Init();
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149
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150 /* First write in the memory followed by a read of the written data --------*/
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151 /* Write on I2C EEPROM from sEE_WRITE_ADDRESS1 */
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152 sEE_WriteBuffer(Tx1_Buffer, sEE_WRITE_ADDRESS1, BUFFER_SIZE1);
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153
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154 /* Set the Number of data to be read */
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155 NumDataRead = BUFFER_SIZE1;
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156
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157 /* Read from I2C EEPROM from sEE_READ_ADDRESS1 */
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158 sEE_ReadBuffer(Rx1_Buffer, sEE_READ_ADDRESS1, (uint16_t *)(&NumDataRead));
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159
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160 #ifdef ENABLE_LCD_MSG_DISPLAY
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161 LCD_DisplayStringLine(LCD_LINE_3, " Transfer 1 Ongoing ");
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162 #endif /* ENABLE_LCD_MSG_DISPLAY */
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163
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164 /* Wait till DMA transfer is complete (Transfer complete interrupt handler
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165 resets the variable holding the number of data to be read) */
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166 while (NumDataRead > 0)
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167 {
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168 /* Starting from this point, if the requested number of data is higher than 1,
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169 then only the DMA is managing the data transfer. Meanwhile, CPU is free to
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170 perform other tasks:
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171
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172 // Add your code here:
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173 //...
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174 //...
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175
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176 For simplicity reasons, this example is just waiting till the end of the
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177 transfer. */
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178 }
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179
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180 /* Check if the data written to the memory is read correctly */
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181 TransferStatus1 = Buffercmp(Tx1_Buffer, Rx1_Buffer, BUFFER_SIZE1);
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182 /* TransferStatus1 = PASSED, if the transmitted and received data
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183 to/from the EEPROM are the same */
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184 /* TransferStatus1 = FAILED, if the transmitted and received data
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185 to/from the EEPROM are different */
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186 #ifdef ENABLE_LCD_MSG_DISPLAY
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187 if (TransferStatus1 == PASSED)
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188 {
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189 LCD_DisplayStringLine(LCD_LINE_3, " Transfer 1 PASSED ");
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190 }
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191 else
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192 {
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193 LCD_DisplayStringLine(LCD_LINE_3, " Transfer 1 FAILED ");
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194 }
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195 #endif /* ENABLE_LCD_MSG_DISPLAY */
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196
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197 /*----------------------------------
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198
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199 ------------------------------------------*/
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200
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201 /* Second write in the memory followed by a read of the written data -------*/
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202 /* Write on I2C EEPROM from sEE_WRITE_ADDRESS2 */
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203 sEE_WriteBuffer(Tx2_Buffer, sEE_WRITE_ADDRESS2, BUFFER_SIZE2);
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204
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205 /* Set the Number of data to be read */
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206 NumDataRead = BUFFER_SIZE2;
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207
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208 /* Read from I2C EEPROM from sEE_READ_ADDRESS2 */
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209 sEE_ReadBuffer(Rx2_Buffer, sEE_READ_ADDRESS2, (uint16_t *)(&NumDataRead));
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210
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211 #ifdef ENABLE_LCD_MSG_DISPLAY
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212 LCD_DisplayStringLine(LCD_LINE_5, " Transfer 2 Ongoing ");
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213 #endif /* ENABLE_LCD_MSG_DISPLAY */
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214
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215 /* Wait till DMA transfer is complete (Transfer complete interrupt handler
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216 resets the variable holding the number of data to be read) */
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217 while (NumDataRead > 0)
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218 {
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219 /* Starting from this point, if the requested number of data is higher than 1,
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220 then only the DMA is managing the data transfer. Meanwhile, CPU is free to
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221 perform other tasks:
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222
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223 // Add your code here:
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224 //...
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225 //...
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226
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227 For simplicity reasons, this example is just waiting till the end of the
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228 transfer. */
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229 }
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230
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231 /* Check if the data written to the memory is read correctly */
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232 TransferStatus2 = Buffercmp(Tx2_Buffer, Rx2_Buffer, BUFFER_SIZE2);
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233 /* TransferStatus2 = PASSED, if the transmitted and received data
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234 to/from the EEPROM are the same */
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235 /* TransferStatus2 = FAILED, if the transmitted and received data
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236 to/from the EEPROM are different */
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237 #ifdef ENABLE_LCD_MSG_DISPLAY
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238 if (TransferStatus1 == PASSED)
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239 {
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240 LCD_DisplayStringLine(LCD_LINE_5, " Transfer 2 PASSED ");
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241 }
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242 else
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243 {
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244 LCD_DisplayStringLine(LCD_LINE_5, " Transfer 2 FAILED ");
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245 }
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246 #endif /* ENABLE_LCD_MSG_DISPLAY */
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247
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248 /* Free all used resources */
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249 sEE_DeInit();
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250
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251 #ifdef ENABLE_LCD_MSG_DISPLAY
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252 /* Display end of example information */
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253 LCD_DisplayStringLine(LCD_LINE_7, "---End Of Example---");
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254 #endif /* ENABLE_LCD_MSG_DISPLAY */
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255
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256 while (1)
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257 {
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258 }
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259 }
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260
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261 #ifndef USE_DEFAULT_TIMEOUT_CALLBACK
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262 /**
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263 * @brief Example of timeout situation management.
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264 * @param None.
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265 * @retval None.
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266 */
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267 uint32_t sEE_TIMEOUT_UserCallback(void)
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268 {
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269 /* Use application may try to recover the communication by resetting I2C
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270 peripheral (calling the function I2C_SoftwareResetCmd()) then re-start
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271 the transmission/reception from a previously stored recover point.
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272 For simplicity reasons, this example only shows a basic way for errors
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273 managements which consists of stopping all the process and requiring system
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274 reset. */
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275
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276 #ifdef ENABLE_LCD_MSG_DISPLAY
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277 /* Display error message on screen */
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278 LCD_Clear(LCD_COLOR_RED);
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279 LCD_DisplayStringLine(LCD_LINE_4, "Communication ERROR!");
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280 LCD_DisplayStringLine(LCD_LINE_5, "Try again after res-");
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281 LCD_DisplayStringLine(LCD_LINE_6, " etting the Board ");
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282 #endif /* ENABLE_LCD_MSG_DISPLAY */
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283
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284 /* Block communication and all processes */
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285 while (1)
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286 {
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287 }
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288 }
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289
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290 #endif /* USE_DEFAULT_TIMEOUT_CALLBACK */
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291
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292 /**
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293 * @brief Compares two buffers.
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294 * @param pBuffer1, pBuffer2: buffers to be compared.
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295 * @param BufferLength: buffer's length
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296 * @retval PASSED: pBuffer1 identical to pBuffer2
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297 * FAILED: pBuffer1 differs from pBuffer2
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298 */
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299 TestStatus Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength)
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300 {
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301 while(BufferLength--)
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302 {
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303 if(*pBuffer1 != *pBuffer2)
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304 {
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305 return FAILED;
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306 }
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307
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308 pBuffer1++;
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309 pBuffer2++;
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310 }
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311
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312 return PASSED;
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313 }
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314
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315 #ifdef USE_FULL_ASSERT
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316
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317 /**
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318 * @brief Reports the name of the source file and the source line number
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319 * where the assert_param error has occurred.
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320 * @param file: pointer to the source file name
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321 * @param line: assert_param error line source number
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322 * @retval None
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323 */
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324 void assert_failed(uint8_t* file, uint32_t line)
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325 {
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326 /* User can add his own implementation to report the file name and line number,
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327 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
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328
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329 /* Infinite loop */
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330 while (1)
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331 {
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332 }
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333 }
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334
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335 #endif
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336
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337 /**
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338 * @}
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339 */
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340
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341 /**
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342 * @}
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343 */
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344
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345 /******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/