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/*
* stm-rtc.c
* ----------
* Functions for using the externally connected RTC chip.
*
* Copyright (c) 2015-2016, NORDUnet A/S All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the NORDUnet nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "stm-init.h"
#include "stm-rtc.h"
I2C_HandleTypeDef hi2c_rtc;
/* I2C2 init function (external RTC chip) */
void rtc_init(void)
{
hi2c_rtc.Instance = I2C2;
hi2c_rtc.Init.ClockSpeed = 10000;
hi2c_rtc.Init.DutyCycle = I2C_DUTYCYCLE_2;
hi2c_rtc.Init.OwnAddress1 = 0; /* Will operate as Master */
hi2c_rtc.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
hi2c_rtc.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
hi2c_rtc.Init.OwnAddress2 = 0;
hi2c_rtc.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
hi2c_rtc.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
if (HAL_I2C_Init(&hi2c_rtc) != HAL_OK) {
Error_Handler();
}
}
HAL_StatusTypeDef rtc_device_ready(uint16_t i2c_addr)
{
return HAL_I2C_IsDeviceReady (&hi2c_rtc, i2c_addr, 10, 1000);
}
HAL_StatusTypeDef rtc_enable_oscillator()
{
uint8_t buf[2];
HAL_StatusTypeDef res;
buf[0] = 0; /* Offset of RTCSEC */
buf[1] = 1 << 7; /* datasheet REGISTERS 5-1, bit 7 = ST (start oscillator) */
while (HAL_I2C_Master_Transmit (&hi2c_rtc, RTC_RTC_ADDR_W, buf, 2, 1000) != HAL_OK) {
res = HAL_I2C_GetError (&hi2c_rtc);
if (res != HAL_I2C_ERROR_AF) {
return res;
}
}
return HAL_OK;
}
HAL_StatusTypeDef rtc_send_byte(const uint16_t i2c_addr, uint8_t value, const uint16_t timeout)
{
HAL_StatusTypeDef res;
while (HAL_I2C_Master_Transmit (&hi2c_rtc, i2c_addr, &value, 1, timeout) != HAL_OK) {
res = HAL_I2C_GetError (&hi2c_rtc);
if (res != HAL_I2C_ERROR_AF) {
return res;
}
}
return HAL_OK;
}
HAL_StatusTypeDef rtc_read_bytes (const uint16_t i2c_addr, uint8_t *buf, const uint8_t len, const uint16_t timeout)
{
HAL_StatusTypeDef res;
while (HAL_I2C_Master_Receive (&hi2c_rtc, i2c_addr, buf, len, timeout) != HAL_OK) {
res = HAL_I2C_GetError (&hi2c_rtc);
if (res != HAL_I2C_ERROR_AF) {
return res;
}
}
return HAL_OK;
}
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