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More work on the low-level I2C handler.

This commit is contained in:
Jonathan Naylor 2020-11-23 15:29:28 +00:00
parent 6c8cf7a838
commit 5e8e0577da
2 changed files with 8 additions and 39 deletions
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46
I2CPort.cpp
View File

@ -92,6 +92,7 @@ bool CI2CPort::init()
{
I2C_TypeDef* i2CPort = NULL;
uint32_t i2CClock = 0U;
uint32_t i2CPins = 0U;
uint8_t i2CIrq = 0U;
switch (m_n) {
@ -99,16 +100,19 @@ bool CI2CPort::init()
i2CPort = I2C1;
i2CIrq = I2C1_EV_IRQn;
i2CClock = RCC_APB1Periph_I2C1;
i2CPins = GPIO_Pin_8 | GPIO_Pin_9; // PB8 PB9, P25 NXDN LEDs
break;
case 2U:
i2CPort = I2C2;
i2CIrq = I2C2_EV_IRQn;
i2CClock = RCC_APB1Periph_I2C2;
i2CPins = GPIO_Pin_10 | GPIO_Pin_11;
break;
case 3U:
i2CPort = I2C3;
i2CIrq = I2C3_EV_IRQn;
i2CClock = RCC_APB1Periph_I2C3;
i2CPins = GPIO_Pin_8 | GPIO_Pin_9; // PA8 PC9 XXX FIXME
break;
default:
return false;
@ -123,7 +127,7 @@ bool CI2CPort::init()
// RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_AFIO, ENABLE);
// Configure I2C GPIOs
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
GPIO_InitStructure.GPIO_Pin = i2CPins;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_Init(GPIOB, &GPIO_InitStructure);
@ -196,51 +200,17 @@ void CI2CPort::eventHandler()
uint32_t event = I2C_GetLastEvent(i2CPort);
switch (event) {
case I2C_EVENT_SLAVE_TRANSMITTER_ADDRESS_MATCHED:
case I2C_EVENT_SLAVE_BYTE_TRANSMITTED:
case I2C_EVENT_MASTER_BYTE_TRANSMITTED:
if (fifoLevel() > 0U) {
I2C_SendData(i2CPort, m_fifo[m_fifoTail]);
m_fifoTail++;
if (m_fifoTail >= I2C_TX_FIFO_SIZE)
m_fifoTail = 0U;
} else
I2C_SendData(i2CPort, 0U);
break;
case I2C_EVENT_SLAVE_STOP_DETECTED:
clearFlag();
break;
}
}
break;
void CI2CPort::clearFlag()
{
I2C_TypeDef* i2CPort = NULL;
switch (m_n) {
case 1U:
i2CPort = I2C1;
break;
case 2U:
i2CPort = I2C2;
break;
case 3U:
i2CPort = I2C3;
break;
default:
return;
}
// Clear ADDR flag
while((i2CPort->SR1 & I2C_SR1_ADDR) == I2C_SR1_ADDR) {
i2CPort->SR1;
i2CPort->SR2;
}
// Clear STOPF flag
while((i2CPort->SR1 & I2C_SR1_STOPF) == I2C_SR1_STOPF) {
i2CPort->SR1;
i2CPort->CR1 |= 0x1;
break;
}
}

1
I2CPort.h
View File

@ -47,7 +47,6 @@ private:
uint16_t fifoLevel();
bool fifoPut(uint8_t next);
void clearFlag();
};
#endif