56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
/*
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* eeprom.c
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*
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* Created on: Jun 7, 2017
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* Author: wn
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*/
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#include "eeprom.h"
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#include "stm32f1xx_hal.h"
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#define HIGH GPIO_PIN_SET
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#define LOW GPIO_PIN_RESET
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extern SPI_HandleTypeDef hspi1;
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const uint8_t EEPROM_READ = 0x03;
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const uint8_t EEPROM_WRITE = 0x02;
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const uint8_t EEPROM_WRDI = 0x04;
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const uint8_t EEPROM_WREN = 0x06;
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const uint8_t EEPROM_RDSR = 0x05;
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const uint8_t EEPROM_WRSR = 0x01;
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static void __EEPROM_CS(GPIO_PinState v) {
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HAL_GPIO_WritePin(EEPROM_CS_GPIO_Port, EEPROM_CS_Pin, v);
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}
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static void __HAL_SPI_Transmit_One_ByValue(SPI_HandleTypeDef *hspi, uint8_t c) {
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HAL_SPI_Transmit(hspi, &c, 1, 0);
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}
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void eepromWrite(uint16_t addr, uint8_t *buf, uint8_t len) {
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__EEPROM_CS(LOW);
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__HAL_SPI_Transmit_One_ByValue(&hspi1, EEPROM_WREN);
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__HAL_SPI_Transmit_One_ByValue(&hspi1, EEPROM_WRITE);
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HAL_SPI_Transmit(&hspi1, (uint8_t*)&addr, 2, 0);
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HAL_SPI_Transmit(&hspi1, buf, len, 0);
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__EEPROM_CS(HIGH);
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}
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void eepromRead(uint16_t addr, uint8_t *buf, uint8_t len) {
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__EEPROM_CS(LOW);
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__HAL_SPI_Transmit_One_ByValue(&hspi1, EEPROM_READ);
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HAL_SPI_Transmit(&hspi1, (uint8_t*)&addr, 2, 0);
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HAL_SPI_Receive(&hspi1, buf, len, 0);
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__EEPROM_CS(HIGH);
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}
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