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Include the GPIO initialisation for I2C3.

This commit is contained in:
Jonathan Naylor 2021-04-12 21:50:27 +01:00
parent ee3ab88b2a
commit 02ba20401b
2 changed files with 86 additions and 2 deletions
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83
I2C3.cpp
View File

@ -50,6 +50,14 @@
#define I2C_OA2_NOMASK ((uint8_t)0x00U)
#define GPIO_MODE_AF_OD ((uint32_t)0x00000012U)
#define GPIO_OUTPUT_TYPE ((uint32_t)0x00000010U)
#define GPIO_MODE ((uint32_t)0x00000003U)
#define GPIO_NUMBER (16U)
#define I2C_ENABLE() (SET_BIT(I2C3->CR1, I2C_CR1_PE))
#define I2C_DISABLE() (CLEAR_BIT(I2C3->CR1, I2C_CR1_PE))
@ -66,6 +74,12 @@
tmpreg = READ_BIT(RCC->AHB1ENR, RCC_AHB1ENR_GPIOCEN);\
} while(0)
#define RCC_I2C3_CLK_ENABLE() do { \
__IO uint32_t tmpreg; \
SET_BIT(RCC->APB1ENR, RCC_APB1ENR_I2C3EN);\
tmpreg = READ_BIT(RCC->APB1ENR, RCC_APB1ENR_I2C3EN);\
} while(0)
CI2C3::CI2C3()
{
}
@ -88,11 +102,14 @@ void CI2C3::init()
configDigitalFilter(0U);
}
void CI2C3::write(uint8_t addr, const uint8_t* data, uint8_t length)
void CI2C3::write(uint16_t addr, const uint8_t* data, uint8_t length)
{
DEBUG2("OLED Data", addr);
DEBUG_DUMP(data, length);
// Shift the address to the left
addr <<= 3;
// Wait for the I2C transmitter to become free
while (I2C_GET_FLAG(I2C_FLAG_BUSY) == SET)
;
@ -166,6 +183,8 @@ void CI2C3::configDigitalFilter(uint32_t DigitalFilter)
void CI2C3::initI2C3()
{
initMSP();
/* Disable the selected I2C peripheral */
I2C_DISABLE();
@ -199,5 +218,67 @@ void CI2C3::initI2C3()
I2C_ENABLE();
}
void CI2C3::initMSP()
{
RCC_GPIOC_CLK_ENABLE();
RCC_GPIOA_CLK_ENABLE();
/* I2C3 GPIO Configuration
PC9 ------> I2C3_SDA
PA8 ------> I2C3_SCL
*/
initGPIO(GPIOC, GPIO_Pin_9);
initGPIO(GPIOA, GPIO_Pin_8);
// Peripheral clock enable
RCC_I2C3_CLK_ENABLE();
}
void CI2C3::initGPIO(GPIO_TypeDef* GPIOx, uint32_t Pin)
{
// Configure the port pins
for (uint32_t position = 0U; position < GPIO_NUMBER; position++)
{
// Get the IO position
uint32_t ioposition = ((uint32_t)0x01) << position;
// Get the current IO position
uint32_t iocurrent = Pin & ioposition;
if (iocurrent == ioposition)
{
// Configure the IO Speed
uint32_t temp = GPIOx->OSPEEDR;
temp &= ~(GPIO_OSPEEDER_OSPEEDR0 << (position * 2));
temp |= (GPIO_High_Speed << (position * 2));
GPIOx->OSPEEDR = temp;
// Configure the IO Output Type
temp = GPIOx->OTYPER;
temp &= ~(GPIO_OTYPER_OT_0 << position) ;
temp |= (((GPIO_MODE_AF_OD & GPIO_OUTPUT_TYPE) >> 4) << position);
GPIOx->OTYPER = temp;
// Activate the Pull Up resistor for the current IO
temp = GPIOx->PUPDR;
temp &= ~(GPIO_PUPDR_PUPDR0 << (position * 2));
temp |= ((GPIO_PuPd_UP) << (position * 2));
GPIOx->PUPDR = temp;
// Configure Alternate function mapped with the current IO
temp = GPIOx->AFR[position >> 3];
temp &= ~((uint32_t)0xF << ((uint32_t)(position & (uint32_t)0x07) * 4)) ;
temp |= ((uint32_t)(GPIO_AF4_I2C3) << (((uint32_t)position & (uint32_t)0x07) * 4));
GPIOx->AFR[position >> 3] = temp;
// Configure IO Direction mode (Input, Output, Alternate or Analog)
temp = GPIOx->MODER;
temp &= ~(GPIO_MODER_MODER0 << (position * 2));
temp |= ((GPIO_MODE_AF_OD & GPIO_MODE) << (position * 2));
GPIOx->MODER = temp;
}
}
}
#endif

5
I2C3.h
View File

@ -35,15 +35,18 @@ public:
void init();
void write(uint8_t addr, const uint8_t* data, uint8_t length);
void write(uint16_t addr, const uint8_t* data, uint8_t length);
private:
void transferConfig(uint16_t addr, uint8_t length, uint32_t mode, uint32_t request);
void configAnalogFilter(uint32_t AnalogFilter);
void configDigitalFilter(uint32_t DigitalFilter);
void initI2C3();
void initMSP();
void initGPIO(GPIO_TypeDef* GPIOx, uint32_t Pin);
};
#endif
#endif