STM8L-15X系列例程

/** @page I2C_EEPROM I2C1 in communication with I2C EEPROM. @verbatim ******************** (C)COPYRIGHT 2011 STMicroelectronics ******************* * @file I2C/I2C_EEPROM/readme.txt * @author MCD Application Team * @version V1.5.0 * @date 13-May-2011 * @brief Description of the I2C EEPROM Example. ****************************************************************************** * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. ****************************************************************************** @endverbatim @par Example description This example provides a basic example of how to use the I2C software library and an associated I2C EEPROM driver to communicate with an I2C EEPROM device (here the example is interfacing with E24C64 EEPROMs . At startup a message is displayed on the HyperTerminal (through USART asking user to enter the data to write into the SPI FLASH. Each byte received is sent back to the HyperTerminal and stored in the predefined buffer RxBuffer1. The communication is managed by USART Transmit and Receive interrupts. If user presses keyboard ENTER key or RxBuffer1 length is reached (defined by RX_BUFFER1_SIZE in main.c , the program starts programming the I2C EEPROM with data entered by the user. Next, the content of RxBuffer1 is written to the EEPROM_WriteAddress1 and the written data is read. The written and the read buffers data are then compared and the result of this comparison is stored in the "TransferStatus1" variable. Following the read operation, the program wait that the EEPROM reverts to its Standby state. A second write operation is, then, performed and this time, TxBuffer2 is written to EEPROM_WriteAddress2, which represents the address just after the last written one in the first write. After completion of the second write operation, the written data are read. The contents of the written and the read buffers are compared and the result of this comparison is stored in the "TransferStatus2" variable. I2C peripheral is configured in Master transmitter during write operation and in Master receiver during read operation from I2C EEPROM. The speed is set to 200kHz. For E24C64 device all the memory is accessible through the two-bytes addressing mode and need to define block addresses. In this case, only the physical address has to be defined (according to the address pins (E0,E1 and E2) connection. This address is defined in stm8_eval_i2c_ee.h (default is 0xA0: E0, E1 and E2 tied to ground. The EEPROM addresses where the program start the write and the read operations is defined in the main.c file. @par Directory contents - I2C/I2C_EEPROM/main.c Main file - I2C/I2C_EEPROM/stm8l15x_conf.h Library Configuration file - I2C/I2C_EEPROM/stm8l15x_it.c Interrupt routines source - I2C/I2C_EEPROM/stm8l15x_it.h Interrupt routines declaration @par Hardware and Software environment - This example runs on STM8L15x High-Density, Medium-Density Plus, Medium-Density and Low-Density Devices. - This example has been tested with STMicroelectronics STM8L1528-EVAL (STM8L15x High-Density devices) and STM8L1526-EVAL (STM8L15x Medium-Density and Low-Density devices) evaluation boards and can be easily tailored to any other development board. - STM8L1528-EVAL Set-up - Make sure that the LCD glass daughter board is mounted in IO position. For more details please refer to the evaluation board user manual. - For write operations, make sure the jumper JP6 "E2P_WP" is connected on the board (If this jumper is not connected, the EEPROM will be write- protected). - Connect a null-modem female/female RS232 cable between the DB9 connector CN1 and PC serial port. - Make sure that JP5 jumper is in RS232 position - Make sure that JP11 jumper is in RS232 position - Make sure that JP12 jumper is in RS232 position - STM8L1526-EVAL Set-up - Make sure that the LCD glass daughter board is mounted in IO position. For more details please refer to the evaluation board user manual. - Make sure that Jumper JP7 is set in position 1-2 (I2C position . - For write operations, make sure the jumper JP14 "E2P_WP" is connected on the board (If this jumper is not connected, the EEPROM will be write-protected). - Connect a null-modem female/female RS232 cable between the DB9 connector CN1 and PC serial port. - Make sure that JP5 jumper is in RS232 position - Make sure that the LCD glass daughter board is mounted in IO position. - Other platform Set-up - Use STM8L1526-EVAL hardware configuration defines. - Connect I2C1 SCL pin (PC.01 to I2C EEPROM SCL (pin6 - Connect I2C1 SDA pin (PC.00 to I2C EEPROM SDA (pin5 - Check that a pull-up resistor (4.7K) is connected on one I2C SDA pin - Check that a pull-up resistor (4.7K) is connected on one I2C SCL pin - Connect I2C EEPROM Vcc (pin8) to Vdd - Connect I2C EEPROM Vss (pin4) to Vss - For E24C64: Connect I2C EEPROM E0, E1 and E2 (pin1, pin2 and pin3 to Vss @note The pull-up resistors are already implemented on the STM8L1528-EVAL and STM8L1526-EVAL evaluation boards. - HyperTerminal configuration: - Word Length = 7 Bits - One Stop Bit - Odd parity - BaudRate = 115200 baud @par How to use it ? In order to make the program work, you must do the following : - Copy all source files from this example folder to the template folder under Project\STM8L15x_StdPeriph_Template - Open your preferred toolchain - Add the required file: - stm8_eval_i2c_ee.c (under Utilities/STM8_EVAL/Common) - Rebuild all files and load your image into target memory - Run the example @note - Low-Density devices are STM8L15x microcontrollers where the Flash memory density ranges between 4 and 8 Kbytes. - Medium-Density devices are STM8L15x microcontrollers where the Flash memory density ranges between 16 and 32 Kbytes. - Medium density Plus devices are STM8L151R6, STM8L152R6 microcontrollers where the Flash memory density is fixed and equal to 32 Kbytes and with wider range of peripheral and features than the medium density devices. - High-Density devices are STM8L15x microcontrollers where the Flash memory density is 64 Kbytes and with the same peripheral set than Medium Density Plus devices. * <h3><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h3> */