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Start filling in the I2C initialisation code.

This commit is contained in:
Jonathan Naylor 2020-11-19 14:55:53 +00:00
parent 1978b2b357
commit 7f7ce2072a
1 changed files with 70 additions and 2 deletions
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72
I2CPort.cpp
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@ -22,6 +22,17 @@
#include "I2CPort.h" #include "I2CPort.h"
#if defined(STM32F4XX)
#include "stm32f4xx.h"
#include "stm32f4xx_i2c.h"
#elif defined(STM32F7XX)
#include "stm32f7xx.h"
#include "stm32f7xx_i2c.h"
#endif
const uint32_t I2C_CLK_FREQ = 100000U; // XXX FIXME
const uint16_t I2C_ADDR = 0U; // XXX FIXME
CI2CPort::CI2CPort(uint8_t n) : CI2CPort::CI2CPort(uint8_t n) :
m_n(n), m_n(n),
m_ok(false) m_ok(false)
@ -30,18 +41,75 @@ m_ok(false)
bool CI2CPort::init() bool CI2CPort::init()
{ {
I2C_TypeDef* i2CPort = NULL;
uint32_t i2CClock = 0U;
uint8_t i2CIrq = 0U;
switch (m_n) { switch (m_n) {
case 1U: case 1U:
i2CPort = I2C1;
i2CIrq = I2C1_EV_IRQn;
i2CClock = RCC_APB1Periph_I2C1;
break; break;
case 2U: case 2U:
i2CPort = I2C2;
i2CIrq = I2C2_EV_IRQn;
i2CClock = RCC_APB1Periph_I2C2;
break; break;
case 3U: case 3U:
i2CPort = I2C3;
i2CIrq = I2C3_EV_IRQn;
i2CClock = RCC_APB1Periph_I2C3;
break; break;
default: default:
return m_ok; return false;
} }
return m_ok; GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
I2C_InitTypeDef I2C_InitStructure;
RCC_APB1PeriphClockCmd(i2CClock, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
// Configure I2C GPIOs
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// Configure the I2C event interrupt
NVIC_InitStructure.NVIC_IRQChannel = i2CIrq;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 15;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 15;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
// Configure the I2C error interrupt
NVIC_InitStructure.NVIC_IRQChannel = i2CIrq;
NVIC_Init(&NVIC_InitStructure);
// I2C configuration
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = I2C_ADDR << 1;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = I2C_CLK_FREQ;
// Enable I2C
I2C_Cmd(i2CPort, ENABLE);
// Apply I2C configuration
I2C_Init(i2CPort, &I2C_InitStructure);
I2C_ITConfig(i2CPort, I2C_IT_EVT, ENABLE);
I2C_ITConfig(i2CPort, I2C_IT_BUF, ENABLE);
I2C_ITConfig(i2CPort, I2C_IT_ERR, ENABLE);
m_ok = true;
return true;
} }
uint8_t CI2CPort::writeCommand(const uint8_t* data, uint8_t length) uint8_t CI2CPort::writeCommand(const uint8_t* data, uint8_t length)