Posted on June 18, 2012 at 01:09I want to send 6 Bytes by I2C to slave, but when I send address slave and wait for ACK the is no reaction. I used 10k pull-up resistor.
CLOCK_SPEED = 100000=100kHz
BUFFERSIZE = 6
/******************** main.c **********************/#include ''stm8l15x.h''
#include ''main.h''
/* -------------------------------- I2C ------------------------------------- */
uint8_t i = 0;
__IO uint8_t Tx_Idx = 0;
__IO uint8_t NumOfBytes = BUFFERSIZE;
extern __IO uint8_t TxBuffer[BUFFERSIZE];
static void I2C_Config(void);
void main(void)
{
I2C_Config();
/* Infinite loop */
while (1)
{}
}
static void I2C_Config(void)
{
/* TXBuffer initialization */
TxBuffer[0] = 0x00;
TxBuffer[1] = 0x81;
TxBuffer[2] = 0x08;
TxBuffer[3] = 0x50;
TxBuffer[4] = 0x01;
TxBuffer[5] = 0x15;
/* GPIOD configuration */
//GPIO_Init(GPIOC, GPIO_Pin_0|GPIO_Pin_1, GPIO_Mode_Out_OD_HiZ_Fast);
/* system_clock / 1 */
CLK_SYSCLKDivConfig(CLK_SYSCLKDiv_1);
/* I2C clock Enable*/
CLK_PeripheralClockConfig(CLK_Peripheral_I2C1, ENABLE);
/* Initialize I2C peripheral */
I2C_Init(I2C1, I2C_SPEED, 0xA0, I2C_Mode_I2C, I2C_DutyCycle_2, I2C_Ack_Enable, I2C_AcknowledgedAddress_7bit);
/* Enable Buffer and Event Interrupt*/
I2C_ITConfig(I2C1, (I2C_IT_TypeDef)(I2C_IT_EVT | I2C_IT_BUF) , ENABLE);
enableInterrupts();
I2C_Cmd(I2C1,ENABLE);
/* Send START condition */
I2C_GenerateSTART(I2C1, ENABLE);
while (NumOfBytes);
//while (I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));
}
/*************** stm8l151x_it.c *****************************/NTERRUPT_HANDLER(I2C1_SPI2_IRQHandler, 29)
{
switch (I2C_GetLastEvent(I2C1))
{
/* EV5 */
case I2C_EVENT_MASTER_MODE_SELECT :
/* Send slave Address for write */
I2C_Send7bitAddress(I2C1, SLAVE_ADDRESS, I2C_Direction_Transmitter);
break;
/* EV6 */
case I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED:
if (NumOfBytes != 0)
{
/* Send the first Data */
I2C_SendData(I2C1, TxBuffer[Tx_Idx++]);
/* Decrement number of bytes */
NumOfBytes--;
}
if (NumOfBytes == 0)
{
I2C_ITConfig(I2C1, I2C_IT_BUF, DISABLE);
}
break;
/* EV8 */
case I2C_EVENT_MASTER_BYTE_TRANSMITTING:
/* Transmit Data */
I2C_SendData(I2C1, TxBuffer[Tx_Idx++]);
/* Decrement number of bytes */
NumOfBytes--;
if (NumOfBytes == 0)
{
I2C_ITConfig(I2C1, I2C_IT_BUF, DISABLE);
}
break;
/* EV8_2 */
case I2C_EVENT_MASTER_BYTE_TRANSMITTED:
/* Send STOP condition */
I2C_GenerateSTOP(I2C1, ENABLE);
I2C_ITConfig(I2C1, I2C_IT_EVT, DISABLE);
break;
default:
break;
}
}
The last action, which I observed was in INTERRUPT_HANDLER (I2C_Send7bitAddress(I2C1, SLAVE_ADDRESS, I2C_Direction_Transmitter);)
