56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
#include "eeprom.h"
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#include "errors.h"
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#include "stm32f3xx_hal.h"
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#include "stm32f3xx_hal_exti.h"
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#include "stm32f3xx_hal_i2c.h"
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#include <string.h>
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#define EEPROM_I2C_ADDR 0xA0
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// Don't use the beginning of the EEPROM, since the testbench writes there
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#define EEPROM_CONFIG_BASE 0x0100
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#define EEPROM_CONFIG_ECC_OFFSET 0x20
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EEPROMConfig eeprom_config;
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static I2C_HandleTypeDef* hi2c;
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void eeprom_init(I2C_HandleTypeDef* handle) {
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hi2c = handle;
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uint8_t buf[sizeof(EEPROMConfig) * 3];
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// Read 3 EEPROM config buffers at 32 byte offsets
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for (size_t ecc_i = 0; ecc_i < 3; ecc_i++) {
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HAL_I2C_Mem_Read(hi2c, EEPROM_I2C_ADDR,
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EEPROM_CONFIG_BASE + EEPROM_CONFIG_ECC_OFFSET * ecc_i, 2,
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buf + sizeof(EEPROMConfig) * ecc_i, sizeof(EEPROMConfig),
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100);
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}
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// ECC
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for (size_t i = 0; i < sizeof(EEPROMConfig); i++) {
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uint8_t a = buf[i + sizeof(EEPROMConfig) * 0];
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uint8_t b = buf[i + sizeof(EEPROMConfig) * 1];
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uint8_t c = buf[i + sizeof(EEPROMConfig) * 2];
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if (a == b || a == c) {
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buf[i] = a;
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} else if (b == c) {
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buf[i] = b;
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} else {
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set_error_source(ERROR_SOURCE_EEPROM);
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}
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}
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memcpy(&eeprom_config, buf, sizeof(EEPROMConfig));
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// Write back config
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eeprom_config.id = 10;
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eeprom_config_save();
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}
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void eeprom_config_save() {
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for (size_t ecc_i = 0; ecc_i < 3; ecc_i++) {
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HAL_I2C_Mem_Write(hi2c, EEPROM_I2C_ADDR,
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EEPROM_CONFIG_BASE + EEPROM_CONFIG_ECC_OFFSET * ecc_i, 2,
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(uint8_t*)&eeprom_config, sizeof(eeprom_config), 100);
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HAL_Delay(100);
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}
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}
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