mirror of https://github.com/g4klx/MMDVM.git
128 lines
4.0 KiB
C++
128 lines
4.0 KiB
C++
/*
|
|
* Copyright (C) 2020,2021 by Jonathan Naylor G4KLX
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include "Config.h"
|
|
|
|
#if defined(MODE_OLED)
|
|
|
|
#include "I2C3.h"
|
|
|
|
#include "Globals.h"
|
|
|
|
CI2C3::CI2C3()
|
|
{
|
|
}
|
|
|
|
void CI2C3::init()
|
|
{
|
|
// Enable I2C3
|
|
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C3, ENABLE);
|
|
|
|
// Reset the Peripheral
|
|
RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C3, ENABLE);
|
|
RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C3, DISABLE);
|
|
|
|
// Enable the GPIOs for the SCL/SDA Pins
|
|
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOC, ENABLE);
|
|
|
|
// Configure and initialize the GPIOs
|
|
GPIO_InitTypeDef GPIO_InitStructure;
|
|
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
|
|
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
|
|
GPIO_InitStructure.GPIO_Speed = GPIO_High_Speed;
|
|
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
|
|
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
|
|
GPIO_Init(GPIOA, &GPIO_InitStructure);
|
|
|
|
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
|
|
GPIO_Init(GPIOC, &GPIO_InitStructure);
|
|
|
|
// Connect GPIO pins to I2C3
|
|
GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF4_I2C3);
|
|
GPIO_PinAFConfig(GPIOC, GPIO_PinSource9, GPIO_AF4_I2C3);
|
|
|
|
// Configure and Initialize I2C3
|
|
I2C_InitTypeDef I2C_InitStructure;
|
|
I2C_InitStructure.I2C_Timing = 0x0010061AU; // 400kHz (Fast Mode)
|
|
I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
|
|
I2C_InitStructure.I2C_DigitalFilter = 0U; // No digital filter
|
|
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
|
|
I2C_InitStructure.I2C_OwnAddress1 = 0x00U; // We are the master. We don't need this
|
|
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
|
|
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
|
|
|
|
// Initialize the Peripheral
|
|
I2C_Init(I2C3, &I2C_InitStructure);
|
|
|
|
// I2C Peripheral Enable
|
|
I2C_Cmd(I2C3, ENABLE);
|
|
}
|
|
|
|
void CI2C3::write(uint8_t addr, const uint8_t* data, uint16_t length)
|
|
{
|
|
DEBUG2("OLED Data", addr);
|
|
DEBUG_DUMP(data, length);
|
|
|
|
// Wait for the I2C transmitter to become free
|
|
waitISRFlagsSet(I2C_ISR_BUSY);
|
|
|
|
// Configure the data transfer
|
|
configureDataTransfer(length, addr);
|
|
|
|
// Start Writing Data
|
|
for (uint16_t i = 0U; i < length; i++) {
|
|
// Wait for the TXIS flag to be set
|
|
waitISRFlagsSet(I2C_ISR_TXIS);
|
|
|
|
// Write the byte to the TXDR
|
|
I2C3->TXDR = data[i];
|
|
}
|
|
|
|
waitISRFlagsSet(I2C_ISR_STOPF);
|
|
|
|
I2C3->ISR &= ~I2C_ISR_STOPF;
|
|
|
|
I2C3->CR2 &= (uint32_t)~((uint32_t)(I2C_CR2_SADD | I2C_CR2_HEAD10R | I2C_CR2_NBYTES | I2C_CR2_RELOAD | I2C_CR2_RD_WRN));
|
|
}
|
|
|
|
void CI2C3::waitISRFlagsSet(uint32_t flags)
|
|
{
|
|
// Wait till the specified ISR Bits are set
|
|
// More than 1 Flag can be "or"ed.
|
|
while ((I2C3->ISR & flags) != flags)
|
|
;
|
|
}
|
|
|
|
void CI2C3::configureDataTransfer(uint8_t size, uint8_t addr)
|
|
{
|
|
I2C3->CR2 &= ~(I2C_CR2_SADD |
|
|
I2C_CR2_NBYTES |
|
|
I2C_CR2_RELOAD |
|
|
I2C_CR2_AUTOEND |
|
|
(I2C_CR2_RD_WRN & (uint32_t)(I2C_Generate_Start_Write >> (31U - I2C_CR2_RD_WRN_Pos))) |
|
|
I2C_CR2_START |
|
|
I2C_CR2_STOP);
|
|
I2C3->CR2 |= (uint32_t)(((uint32_t)addr & I2C_CR2_SADD) |
|
|
(((uint32_t)size << I2C_CR2_NBYTES_Pos) & I2C_CR2_NBYTES) |
|
|
(uint32_t)I2C_CR2_RELOAD |
|
|
(uint32_t)I2C_Generate_Start_Write);
|
|
}
|
|
|
|
#endif
|
|
|