373 lines
8.8 KiB
C
373 lines
8.8 KiB
C
/**
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******************************************************************************
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* @file Project/ee_drivers/i2c_ee.c
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* @author X9D Application Team
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* @version V 0.2
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* @date 12-JULY-2012
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* @brief This file provides a set of functions needed to manage the
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* communication between I2C peripheral and I2C M24CXX EEPROM.
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CAT5137 added,share the I2C.
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******************************************************************************
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*/
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#include "../open9x.h"
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#define I2C_delay() delay_01us(100);
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/**
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* @brief Configure the used I/O ports pin
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* @param None
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* @retval None
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*/
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static void I2C_GPIO_Configuration(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIOB->BSRRH =I2C_EE_WP; //PB9
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GPIO_InitStructure.GPIO_Pin = I2C_EE_WP;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
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GPIO_Init(I2C_EE_WP_GPIO, &GPIO_InitStructure);
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/* Configure I2C_EE pins: SCL and SDA */
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GPIO_InitStructure.GPIO_Pin = I2C_EE_SCL | I2C_EE_SDA;//PE0,PE1
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
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GPIO_Init(I2C_EE_GPIO, &GPIO_InitStructure);
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//Set Idle levels
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SDA_H;
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SCL_H;
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}
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short I2C_START()
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{
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SDA_H;
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I2C_delay();
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SCL_H;
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I2C_delay();
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// if (!SDA_read) return 0;
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SDA_L;
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I2C_delay();
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// if (SDA_read) return 0;
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SCL_L;
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I2C_delay();
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return 1;
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}
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void I2C_STOP()
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{
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SCL_L;
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I2C_delay();
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SDA_L;
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I2C_delay();
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SCL_H;
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I2C_delay();
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SDA_H;
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I2C_delay();
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}
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void I2C_ACK()
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{
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SCL_L;
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I2C_delay();
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SDA_L;
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I2C_delay();
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SCL_H;
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I2C_delay();
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SCL_L;
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I2C_delay();
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}
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void I2C_NO_ACK()
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{
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SCL_L;
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I2C_delay();
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SDA_H;
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I2C_delay();
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SCL_H;
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I2C_delay();
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SCL_L;
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I2C_delay();
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}
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short I2C_WAIT_ACK()
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{
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short i=50;
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SCL_L;
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I2C_delay();
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SDA_H;
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I2C_delay();
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SCL_H;
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I2C_delay();
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while(i) {
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if(SDA_read) {
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I2C_delay();
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i--;
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}
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else {
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i=2;
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break;
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}
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}
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SCL_L;
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I2C_delay();
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return i;
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}
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void I2C_SEND_DATA(char SendByte)
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{
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short i=8;
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while (i--) {
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SCL_L;
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I2C_delay();
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if (SendByte & 0x80)
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SDA_H;
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else
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SDA_L;
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SendByte <<= 1;
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I2C_delay();
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SCL_H;
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I2C_delay();
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}
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SCL_L;
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I2C_delay();
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}
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char I2C_READ()
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{
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short i=8;
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char ReceiveByte=0;
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SDA_H;
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while (i--) {
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ReceiveByte <<= 1;
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SCL_L;
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I2C_delay();
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SCL_H;
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I2C_delay();
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if (SDA_read) {
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ReceiveByte|=0x01;
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}
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}
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SCL_L;
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return ReceiveByte;
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}
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void I2C_EE_Init()
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{
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/* GPIO Periph clock enable */
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RCC_AHB1PeriphClockCmd(I2C_EE_GPIO_CLK, ENABLE);
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/* GPIO configuration */
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I2C_GPIO_Configuration();
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}
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/**
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* @brief Writes one byte to the I2C EEPROM.
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* @param pBuffer : pointer to the buffer containing the data to be
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* written to the EEPROM.
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* @param WriteAddr : EEPROM's internal address to write to.
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* @retval None
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*/
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void I2C_EE_ByteWrite(uint8_t* pBuffer, uint16_t WriteAddr)
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{
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I2C_START();
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I2C_SEND_DATA(I2C_EEPROM_ADDRESS|EE_CMD_WRITE);
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I2C_WAIT_ACK();
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#ifdef EE_M24C08
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I2C_SEND_DATA(WriteAddr);
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I2C_WAIT_ACK();
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#else
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I2C_SEND_DATA((uint8_t)((WriteAddr&0xFF00)>>8) );
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I2C_WAIT_ACK();
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I2C_SEND_DATA((uint8_t)(WriteAddr&0xFF));
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I2C_WAIT_ACK();
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#endif
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I2C_SEND_DATA(*pBuffer);
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I2C_WAIT_ACK();
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I2C_STOP();
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}
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/**
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* @brief Reads a block of data from the EEPROM.
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* @param pBuffer : pointer to the buffer that receives the data read
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* from the EEPROM.
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* @param ReadAddr : EEPROM's internal address to read from.
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* @param NumByteToRead : number of bytes to read from the EEPROM.
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* @retval None
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*/
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void I2C_EE_BufferRead(uint8_t* pBuffer, uint16_t ReadAddr, uint16_t NumByteToRead)
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{
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I2C_START();
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I2C_SEND_DATA(I2C_EEPROM_ADDRESS|EE_CMD_WRITE);
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I2C_WAIT_ACK();
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#ifdef EE_M24C08
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I2C_SEND_DATA(ReadAddr);
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I2C_WAIT_ACK();
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#else
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I2C_SEND_DATA((uint8_t)((ReadAddr & 0xFF00) >> 8));
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I2C_WAIT_ACK();
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I2C_SEND_DATA((uint8_t)(ReadAddr & 0x00FF));
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I2C_WAIT_ACK();
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#endif
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I2C_START();
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I2C_SEND_DATA(I2C_EEPROM_ADDRESS|EE_CMD_READ);
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I2C_WAIT_ACK();
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while (NumByteToRead) {
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if (NumByteToRead == 1) {
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*pBuffer =I2C_READ();
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I2C_NO_ACK();
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I2C_STOP();
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}
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else {
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*pBuffer =I2C_READ();
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I2C_ACK();
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pBuffer++;
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}
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NumByteToRead--;
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}
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}
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/**
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* @brief Writes buffer of data to the I2C EEPROM.
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* @param pBuffer : pointer to the buffer containing the data to be
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* written to the EEPROM.
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* @param WriteAddr : EEPROM's internal address to write to.
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* @param NumByteToWrite : number of bytes to write to the EEPROM.
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* @retval None
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*/
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void I2C_EE_BufferWrite(uint8_t* pBuffer, uint16_t WriteAddr, uint16_t NumByteToWrite)
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{
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uint8_t NumOfPage = 0, NumOfSingle = 0, count = 0;
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uint16_t Addr = 0;
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Addr = WriteAddr % I2C_FLASH_PAGESIZE;
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count = I2C_FLASH_PAGESIZE - Addr;
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NumOfPage = NumByteToWrite / I2C_FLASH_PAGESIZE;
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NumOfSingle = NumByteToWrite % I2C_FLASH_PAGESIZE;
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/* If WriteAddr is I2C_FLASH_PAGESIZE aligned */
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if (Addr == 0) {
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/* If NumByteToWrite < I2C_FLASH_PAGESIZE */
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if (NumOfPage == 0) {
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I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);
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I2C_EE_WaitEepromStandbyState();
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}
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/* If NumByteToWrite > I2C_FLASH_PAGESIZE */
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else {
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while (NumOfPage--) {
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I2C_EE_PageWrite(pBuffer, WriteAddr, I2C_FLASH_PAGESIZE);
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I2C_EE_WaitEepromStandbyState();
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WriteAddr += I2C_FLASH_PAGESIZE;
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pBuffer += I2C_FLASH_PAGESIZE;
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}
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if (NumOfSingle != 0) {
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I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);
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I2C_EE_WaitEepromStandbyState();
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}
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}
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}
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/* If WriteAddr is not I2C_FLASH_PAGESIZE aligned */
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else {
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/* If NumByteToWrite < I2C_FLASH_PAGESIZE */
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if (NumOfPage== 0) {
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/* If the number of data to be written is more than the remaining space
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in the current page: */
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if (NumByteToWrite > count) {
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/* Write the data conained in same page */
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I2C_EE_PageWrite(pBuffer, WriteAddr, count);
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I2C_EE_WaitEepromStandbyState();
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/* Write the remaining data in the following page */
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I2C_EE_PageWrite((uint8_t*)(pBuffer + count), (WriteAddr + count), (NumByteToWrite - count));
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I2C_EE_WaitEepromStandbyState();
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}
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else {
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I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);
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I2C_EE_WaitEepromStandbyState();
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}
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}
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/* If NumByteToWrite > I2C_FLASH_PAGESIZE */
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else {
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NumByteToWrite -= count;
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NumOfPage = NumByteToWrite / I2C_FLASH_PAGESIZE;
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NumOfSingle = NumByteToWrite % I2C_FLASH_PAGESIZE;
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if (count != 0) {
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I2C_EE_PageWrite(pBuffer, WriteAddr, count);
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I2C_EE_WaitEepromStandbyState();
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WriteAddr += count;
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pBuffer += count;
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}
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while (NumOfPage--) {
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I2C_EE_PageWrite(pBuffer, WriteAddr, I2C_FLASH_PAGESIZE);
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I2C_EE_WaitEepromStandbyState();
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WriteAddr += I2C_FLASH_PAGESIZE;
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pBuffer += I2C_FLASH_PAGESIZE;
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}
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if (NumOfSingle != 0) {
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I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);
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I2C_EE_WaitEepromStandbyState();
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}
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}
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}
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}
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/**
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* @brief Writes more than one byte to the EEPROM with a single WRITE cycle.
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* @note The number of byte can't exceed the EEPROM page size.
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* @param pBuffer : pointer to the buffer containing the data to be
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* written to the EEPROM.
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* @param WriteAddr : EEPROM's internal address to write to.
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* @param NumByteToWrite : number of bytes to write to the EEPROM.
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* @retval None
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*/
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void I2C_EE_PageWrite(uint8_t* pBuffer, uint16_t WriteAddr, uint8_t NumByteToWrite)
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{
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I2C_START();
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I2C_SEND_DATA(I2C_EEPROM_ADDRESS|EE_CMD_WRITE);
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I2C_WAIT_ACK();
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#ifdef EE_M24C08
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I2C_SEND_DATA(WriteAddr);
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I2C_WAIT_ACK();
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#else
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I2C_SEND_DATA((uint8_t)((WriteAddr & 0xFF00) >> 8));
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I2C_WAIT_ACK();
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I2C_SEND_DATA((uint8_t)(WriteAddr & 0x00FF));
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I2C_WAIT_ACK();
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#endif /* EE_M24C08 */
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/* While there is data to be written */
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while (NumByteToWrite--) {
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I2C_SEND_DATA(*pBuffer);
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I2C_WAIT_ACK();
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pBuffer++;
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}
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I2C_STOP();
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}
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/**
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* @brief Wait for EEPROM Standby state
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* @param None
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* @retval None
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*/
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void I2C_EE_WaitEepromStandbyState(void)
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{
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do {
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I2C_START();
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I2C_SEND_DATA(I2C_EEPROM_ADDRESS|EE_CMD_WRITE);
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} while (0 == I2C_WAIT_ACK());
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I2C_STOP();
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}
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