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Add i2c2_hard_reset inline function to deal with reseting and possibly

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unstucking the bus
This commit is contained in:
Allen
2011-02-24 17:20:19 -08:00
parent ab813e0096
commit 15dd2e5ca3
1 changed files with 63 additions and 24 deletions
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sw/airborne/arch/stm32/mcu_periph/i2c_arch.c
+63 -24
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@@ -9,6 +9,7 @@
static void start_transaction(struct i2c_periph* p);
static inline void i2c2_hard_reset(void);
#ifdef USE_I2C1
@@ -298,12 +299,15 @@ void i2c2_hw_init(void) {
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);
i2c2_hard_reset();
/* I2C Peripheral Enable ----------------------------------------------------*/
I2C_Cmd(I2C2, ENABLE);
/* Apply I2C configuration after enabling it */
I2C2_APPLY_CONFIG();
/* Enable I2C2 error interrupts ---------------------------------------------*/
I2C_ITConfig(I2C2, I2C_IT_ERR, ENABLE);
@@ -346,34 +350,69 @@ static inline void on_status_restart_requested(struct i2c_transaction* trans, ui
start_transaction(&i2c2); \
}
#define I2C_BUSY 0x20
static inline void i2c2_hard_reset(void)
{
I2C_DeInit(I2C2);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
GPIO_SetBits(GPIOB, GPIO_Pin_10 | GPIO_Pin_11);
GPIO_Init(GPIOB, &GPIO_InitStructure);
while(GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_11) == Bit_RESET) {
// Raise SCL, wait until SCL is high (in case of clock stretching)
GPIO_SetBits(GPIOB, GPIO_Pin_10);
while (GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_10) == Bit_RESET);
for (__IO int j = 0; j < 50; j++);
// Lower SCL, wait
GPIO_ResetBits(GPIOB, GPIO_Pin_10);
for (__IO int j = 0; j < 50; j++);
// Raise SCL, wait
GPIO_SetBits(GPIOB, GPIO_Pin_10);
for (__IO int j = 0; j < 50; j++);
}
// Generate a start condition followed by a stop condition
GPIO_SetBits(GPIOB, GPIO_Pin_10);
for (__IO int j = 0; j < 50; j++);
GPIO_ResetBits(GPIOB, GPIO_Pin_11);
for (__IO int j = 0; j < 50; j++);
GPIO_ResetBits(GPIOB, GPIO_Pin_11);
for (__IO int j = 0; j < 50; j++);
// Raise both SCL and SDA and wait for SCL high (in case of clock stretching)
GPIO_SetBits(GPIOB, GPIO_Pin_10 | GPIO_Pin_11);
while (GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_10) == Bit_RESET);
// Wait for SDA to be high
while (GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_11) != Bit_SET);
// SCL and SDA should be high at this point, bus should be free
// Return the GPIO pins to the alternate function
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);
I2C_DeInit(I2C2);
I2C2_APPLY_CONFIG();
if (I2C2->SR2 & I2C_BUSY) {
// Reset the I2C block
I2C_SoftwareResetCmd(I2C2, ENABLE);
I2C_SoftwareResetCmd(I2C2, DISABLE);
}
}
#define I2C2_ABORT_AND_RESET() { \
struct i2c_transaction* trans = i2c2.trans[i2c2.trans_extract_idx]; \
trans->status = I2CTransFailed; \
I2C_ITConfig(I2C2, I2C_IT_EVT | I2C_IT_BUF | I2C_IT_ERR, DISABLE); \
I2C_ClearITPendingBit(I2C2, 0xFF); \
I2C_Cmd(I2C2, DISABLE); \
I2C_DeInit(I2C2); \
I2C2_APPLY_CONFIG(); \
I2C_Cmd(I2C2, ENABLE); \
/* do something to unstuck the bus */ \
GPIO_InitTypeDef GPIO_InitStructure; \
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; \
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz; \
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; \
GPIO_Init(GPIOB, &GPIO_InitStructure); \
for (__IO int i = 0; i < 10; i++) {\
for (__IO int j = 0; j < 50; j++); \
GPIOB->BSRR = GPIO_Pin_10; \
for (__IO int j = 0; j < 50; j++); \
GPIOB->BRR = GPIO_Pin_10; \
} \
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD; \
GPIO_Init(GPIOB, &GPIO_InitStructure); \
I2C_Cmd(I2C2, DISABLE); \
I2C_DeInit(I2C2); \
I2C2_APPLY_CONFIG(); \
I2C_Cmd(I2C2, ENABLE); \
I2C_ClearITPendingBit(I2C2, 0xFF); \
i2c2_hard_reset(); \
I2C_ITConfig(I2C2, I2C_IT_ERR, ENABLE); \
I2C2_END_OF_TRANSACTION(); \
}