Posted on April 20, 2015 at 17:17
Hi, I am trying to configure STM32f3discovery board as slave and arduino board as master. I tried to transmit data from stm32f3discovery board to arduino. However, the problem is the ADDR bit is never set. Can anyone tell me how can i solve this problem?
#include <
stddef.h
>
#include ''stm32f30x.h''
#include ''stm32f30x_conf.h''
/* Private typedef */
typedef enum {
Error = 0, Success =!Error
} Status;
GPIO_InitTypeDef GPIO_InitStruct;
I2C_InitTypeDef I2C_InitStruct;
RCC_ClocksTypeDef RCC_Clocks;
__IO uint32_t TimingDelay = 0;
uint8_t buff[2] = {'a','b'};
Status i2c_slavetransmit(I2C_TypeDef* I2Cx, uint8_t *buf, uint32_t nbuf);
int main(){
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1,ENABLE);
/*I2C SCL and SDA configuration*/
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7; //PB6 SCL PB7 SDA
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_OType = GPIO_OType_OD ;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOB, &GPIO_InitStruct);
/*Connect SCL*/
GPIO_PinAFConfig(GPIOB,GPIO_PinSource6,GPIO_AF_4);
/*Connect SDA*/
GPIO_PinAFConfig(GPIOB,GPIO_PinSource7,GPIO_AF_4);
RCC_I2CCLKConfig(RCC_I2C1CLK_SYSCLK);
RCC_GetClocksFreq(&RCC_Clocks);
SysTick_Config(RCC_Clocks.I2C1CLK_Frequency / 100);
/*configure I2C */
I2C_DeInit(I2C1);
I2C_SoftwareResetCmd(I2C1);
I2C_Cmd(I2C1,ENABLE);
I2C_InitStruct.I2C_Mode = I2C_Mode_I2C;
I2C_InitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStruct.I2C_AnalogFilter = I2C_AnalogFilter_Disable;
I2C_InitStruct.I2C_DigitalFilter = 0x00;
I2C_InitStruct.I2C_Ack = I2C_Ack_Enable;
I2C_InitStruct.I2C_Timing = 0xA061191F;
I2C_InitStruct.I2C_OwnAddress1 = 0x08;
I2C_Init(I2C1,&I2C_InitStruct);
while(1){
}
}
Status i2c_slavetransmit(I2C_TypeDef* I2Cx, uint8_t *buf, uint32_t nbuf){
uint32_t timeout = 0xffff;
I2C_ITConfig(I2C1,I2C_IT_ADDRI,ENABLE);
// if(nbuf){
while(I2C_GetFlagStatus(I2Cx, I2C_FLAG_BUSY)!=RESET){
if (timeout-- == 0)
GPIOE->ODR |= 1L <<
9
;
return Error;
}
while(I2C_GetFlagStatus(I2Cx,I2C_FLAG_ADDR) ==RESET);
GPIOE->ODR |= 1L <<
14
;
while(I2C_GetFlagStatus(I2Cx,I2C_ISR_DIR) != RESET){
if (timeout-- == 0)
GPIOE->ODR |= 1L <<
11
;
return Error;
}
while(I2C_GetFlagStatus(I2Cx,I2C_FLAG_TXE) == RESET);
while(nbuf){
I2C_SendData(I2Cx,*buf++);
while(I2C_GetFlagStatus(I2Cx,I2C_FLAG_TXE) == RESET);
GPIOE->ODR |= 1L <<
12
;
nbuf-- ;
}
GPIOE->ODR |= 1L << 13;
return Success;
}
void SysTick_Handler(void)
{
i2c_slavetransmit(I2C1,buff,2);
if (TimingDelay != 0x00){
TimingDelay--;
}
}
#i2c #stm32f #clive #addr
