mirror of
https://github.com/EranMorkon/AMTS.git
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103 lines
3.7 KiB
C
103 lines
3.7 KiB
C
/*
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Demo program for the 2017/18 open door day at HTL Hollabrunn
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Copyright (C) 2018 Andreas Mieke
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "eeprom.h"
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extern volatile uint32_t SysTickCnt;
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// EEPROM addresse
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#define EEPROM_ADDR (uint8_t)0xA0 // 0b10100000
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// ---- Vendor address part
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// --- User address part
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// - Keep free for R/W bit (set by I2C_Send7bitAddress())
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uint32_t last_write_tick = 0;
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void eeprom_init(void)
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{
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// Init I2C1
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i2c1_init();
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}
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void eeprom_read(uint16_t address, uint8_t *data, uint16_t length)
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{
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uint16_t cur_pos;
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// Send address of EEPROM and start address on EEPROM
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I2C_GenerateSTART(I2C1, ENABLE);
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
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I2C_Send7bitAddress(I2C1, EEPROM_ADDR, I2C_Direction_Transmitter);
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
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I2C_SendData(I2C1, (address & 0xFF00) >> 8);
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
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I2C_SendData(I2C1, (address & 0x00FF));
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
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// Switch to receive mode
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I2C_GenerateSTART(I2C1, ENABLE);
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I2C_AcknowledgeConfig(I2C1, ENABLE);
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
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I2C_Send7bitAddress(I2C1, EEPROM_ADDR, I2C_Direction_Receiver);
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
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// Read all bytes and disable ACK on last byte
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for(cur_pos = 0; cur_pos < length; cur_pos++) {
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if(cur_pos == length - 1) {
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I2C_AcknowledgeConfig(I2C1, DISABLE);
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}
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
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data[cur_pos] = I2C_ReceiveData(I2C1);
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}
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// Send stop condition
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I2C_GenerateSTOP(I2C1, ENABLE);
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}
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void eeprom_write(uint16_t address, uint8_t *data, uint16_t length)
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{
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uint8_t cur_page = 0;
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uint16_t cur_pos = 0;
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address = address & 0xFFA0;
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// If more than one page is needed, cycle over the pages
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for(cur_page = 0; cur_page <= ((length-1)/64); cur_page++) {
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// Wait 5 ms for the write cycle (see datasheet)
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while((SysTickCnt - last_write_tick) <= 5);
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// Send start condition
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I2C_GenerateSTART(I2C1, ENABLE);
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// Send EEPROM address and start address of data to send
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
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I2C_Send7bitAddress(I2C1, EEPROM_ADDR, I2C_Direction_Transmitter);
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
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I2C_SendData(I2C1, (address & 0xFF00) >> 8);
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
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I2C_SendData(I2C1, (address & 0x00FF));
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
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// Send max 64 bytes (1 page) of data
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for(; (cur_pos < length) && (cur_pos%64 <= 63); cur_pos++) {
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I2C_SendData(I2C1, data[cur_pos]);
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while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
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}
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// Generate stop condition and calculate address of next page (if needed)
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I2C_GenerateSTOP(I2C1, ENABLE);
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address += 0x0040;
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last_write_tick = SysTickCnt;
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}
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}
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