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[NUCLEO_F401RE] add stop management in I2C

pull/297/head
dbestm 2014-05-07 17:06:27 +02:00
parent 03f7fcd2a0
commit ae75c78147
1 changed files with 82 additions and 10 deletions
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92
libraries/mbed/targets/hal/TARGET_STM/TARGET_NUCLEO_F401RE/i2c_api.c
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@ -155,29 +155,101 @@ inline int i2c_stop(i2c_t *obj) {
}
int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
int timeout;
int count;
int value;
if (length == 0) return 0;
I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
i2c_start(obj);
// Reception process with 5 seconds timeout
if (HAL_I2C_Master_Receive(&I2cHandle, (uint16_t)address, (uint8_t *)data, length, 5000) != HAL_OK) {
return 0; // Error
// Wait until SB flag is set
timeout = FLAG_TIMEOUT;
while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
timeout--;
if (timeout == 0) {
return 0;
}
}
i2c->DR = __HAL_I2C_7BIT_ADD_READ(address);
// Wait address is acknowledged
timeout = FLAG_TIMEOUT;
while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
timeout--;
if (timeout == 0) {
return 0;
}
}
__HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
// Read all bytes except last one
for (count = 0; count < (length - 1); count++) {
value = i2c_byte_read(obj, 0);
data[count] = (char)value;
}
// If not repeated start, send stop.
// Warning: must be done BEFORE the data is read.
if (stop) {
i2c_stop(obj);
}
// Read the last byte
value = i2c_byte_read(obj, 1);
data[count] = (char)value;
return length;
}
int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
if (length == 0) return 0;
I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
I2cHandle.Instance = (I2C_TypeDef *)(obj->i2c);
int timeout;
int count;
// Transmission process with 5 seconds timeout
if (HAL_I2C_Master_Transmit(&I2cHandle, (uint16_t)address, (uint8_t *)data, length, 5000) != HAL_OK) {
return 0; // Error
if (length == 0) return 0;
i2c_start(obj);
// Wait until SB flag is set
timeout = FLAG_TIMEOUT;
while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_SB) == RESET) {
timeout--;
if (timeout == 0) {
return 0;
}
}
return length;
i2c->DR = __HAL_I2C_7BIT_ADD_WRITE(address);
// Wait address is acknowledged
timeout = FLAG_TIMEOUT;
while (__HAL_I2C_GET_FLAG(&I2cHandle, I2C_FLAG_ADDR) == RESET) {
timeout--;
if (timeout == 0) {
return 0;
}
}
__HAL_I2C_CLEAR_ADDRFLAG(&I2cHandle);
for (count = 0; count < length; count++) {
if (i2c_byte_write(obj, data[count]) != 1) {
i2c_stop(obj);
return 0;
}
}
// If not repeated start, send stop.
if (stop) {
i2c_stop(obj);
}
return count;
}
int i2c_byte_read(i2c_t *obj, int last) {