Полная версия этой страницы: STM32 I2C
При окончании записи в eеprom бит STOP СR1 остается не сброшенным , и при следующем сеансе записи подпрограмма затыкется, подскажите пожалуйста надо ли принудительно сбрасывать этот бит , в примерах такого не видел
Reference manual
Может ошибка записи вылазит? Код в студию.
Цитата
STOP : Stop generation
The bit is set and cleared by software, cleared by hardware when a Stop condition is
detected, set by hardware when a timeout error is detected.
In Master Mode:
0: No Stop generation.
1: Stop generation after the current byte transfer or after the current Start condition is sent.
In Slave mode:
0: No Stop generation.
1: Release the SCL and SDA lines after the current byte transfer.
Note: When the STOP, START or PEC bit is set, the software must not perform any write
access to I2C_CR1 before this bit is cleared by hardware. Otherwise there is a risk of
setting a second STOP, START or PEC request.
The bit is set and cleared by software, cleared by hardware when a Stop condition is
detected, set by hardware when a timeout error is detected.
In Master Mode:
0: No Stop generation.
1: Stop generation after the current byte transfer or after the current Start condition is sent.
In Slave mode:
0: No Stop generation.
1: Release the SCL and SDA lines after the current byte transfer.
Note: When the STOP, START or PEC bit is set, the software must not perform any write
access to I2C_CR1 before this bit is cleared by hardware. Otherwise there is a risk of
setting a second STOP, START or PEC request.
Может ошибка записи вылазит? Код в студию.
-первый вызов-отлично,
во второй не встают MSL \ BUSY
byt_wrt(0, my_var);
byt_wrt(0, my_var);
-функция записи однго байта по адресу:
-обработчик:
во второй не встают MSL \ BUSY
byt_wrt(0, my_var);
byt_wrt(0, my_var);
-функция записи однго байта по адресу:
Код
void byt_wrt(short adr, char data) {
i2c1_adr=i2c_epr_adr|((adr>>7)&0x06);
*(i2c1_tp+1)=adr;
*i2c1_tp=data;
i2c1_tc=2;
i2c1_sts=i2c_bus;
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)){};
I2C_GenerateSTART(I2C1, ENABLE);
}
i2c1_adr=i2c_epr_adr|((adr>>7)&0x06);
*(i2c1_tp+1)=adr;
*i2c1_tp=data;
i2c1_tc=2;
i2c1_sts=i2c_bus;
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)){};
I2C_GenerateSTART(I2C1, ENABLE);
}
-обработчик:
Код
switch (I2C_GetLastEvent(I2C1))
{
/* Start condition released */
case I2C_EVENT_MASTER_MODE_SELECT:
I2C_Send7bitAddress(I2C1, i2c1_adr, I2C_Direction_Transmitter); //sending ADDR with TX attr.
break;
/* slave confirmed ADDR */
case I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED:
I2C_SendData(I2C1, *(i2c1_tp+--i2c1_tc));//sending the first byte
break;
/* byte has gone */
case I2C_EVENT_MASTER_BYTE_TRANSMITTED:
if(i2c1_tc>0){
I2C_SendData(I2C1, *(i2c1_tp+--i2c1_tc));}//sendin' the following byte, if such exists
else {
I2C_GenerateSTOP(I2C1, ENABLE); i2c1_sts=i2c_don; } //no more transmissions needed - sending STOP
break;}
{
/* Start condition released */
case I2C_EVENT_MASTER_MODE_SELECT:
I2C_Send7bitAddress(I2C1, i2c1_adr, I2C_Direction_Transmitter); //sending ADDR with TX attr.
break;
/* slave confirmed ADDR */
case I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED:
I2C_SendData(I2C1, *(i2c1_tp+--i2c1_tc));//sending the first byte
break;
/* byte has gone */
case I2C_EVENT_MASTER_BYTE_TRANSMITTED:
if(i2c1_tc>0){
I2C_SendData(I2C1, *(i2c1_tp+--i2c1_tc));}//sendin' the following byte, if such exists
else {
I2C_GenerateSTOP(I2C1, ENABLE); i2c1_sts=i2c_don; } //no more transmissions needed - sending STOP
break;}
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