avr_libraries/zh_avr_i2c
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This commit is contained in:
Alexey Zholtikov
2025-08-09 12:28:35 +03:00
parent 851605cae3
commit 4547f6f510
2 changed files with 65 additions and 23 deletions
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40
zh_avr_i2c.c
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@@ -11,7 +11,7 @@
#define I2C_COLLISION 0x04
#define I2C_BUS_FAIL 0x08
#define TWCR_START ((1 << TWINT) | (1 << TWEN) | (1 << TWIE))
#define I2C_START ((1 << TWINT) | (1 << TWEN) | (1 << TWIE))
#define I2C_MASTER_READ 1
#define I2C_MASTER_WRITE 0
@@ -47,7 +47,7 @@ avr_err_t zh_avr_i2c_master_probe(const uint8_t addr, TickType_t xTicksToWait)
{
_work_mode = MASTER_PR;
_target_i2c_address = addr;
TWCR = TWCR_START | (1 << TWSTA);
TWCR = I2C_START | (1 << TWSTA);
EventBits_t bits = xEventGroupWaitBits(_event_group_handle, I2C_OK | I2C_NACK | I2C_COLLISION | I2C_BUS_FAIL, pdTRUE, pdFALSE, xTicksToWait);
if (bits & I2C_OK)
{
@@ -106,12 +106,13 @@ uint8_t WorkIndex = 0; // Индекс лога
ISR(TWI_vect) // Прерывание TWI Тут наше все.
{
BaseType_t xHigherPriorityTaskWoken = pdFALSE;
switch (TWSR & 0xF8) // Отсекаем биты прескалера
{
case 0x00: // Bus error.
printf("00\n");
TWCR = TWCR_START | (1 << TWSTO);
xEventGroupSetBitsFromISR(_event_group_handle, I2C_BUS_FAIL, NULL);
TWCR = I2C_START | (1 << TWSTO);
xEventGroupSetBitsFromISR(_event_group_handle, I2C_BUS_FAIL, &xHigherPriorityTaskWoken);
break;
case 0x08: // A START condition has been transmitted.
printf("08\n");
@@ -125,7 +126,7 @@ ISR(TWI_vect) // Прерывание TWI Тут наше все.
break;
case MASTER_PR:
TWDR = (_target_i2c_address << 1) | I2C_MASTER_READ;
TWCR = TWCR_START;
TWCR = I2C_START;
break;
default:
break;
@@ -133,7 +134,7 @@ ISR(TWI_vect) // Прерывание TWI Тут наше все.
break;
case 0x10: // A repeated START condition has been transmitted.
printf("10\n");
TWCR = TWCR_START | (1 << TWSTO);
TWCR = I2C_START | (1 << TWSTO);
break;
case 0x18: // SLA+W has been transmitted. ACK has been received.
printf("18\n");
@@ -149,6 +150,8 @@ ISR(TWI_vect) // Прерывание TWI Тут наше все.
break;
case 0x38: // Arbitration lost in SLA+W or data bytes. Arbitration lost in SLA+R or NOT ACK bit.
printf("38\n");
TWCR = I2C_START | (1 << TWSTO);
xEventGroupSetBitsFromISR(_event_group_handle, I2C_COLLISION, &xHigherPriorityTaskWoken);
break;
case 0x40: // SLA+R has been transmitted. ACK has been received.
printf("40\n");
@@ -161,8 +164,8 @@ ISR(TWI_vect) // Прерывание TWI Тут наше все.
case MASTER_TX_RX:
break;
case MASTER_PR:
TWCR = TWCR_START | (1 << TWSTO);
xEventGroupSetBitsFromISR(_event_group_handle, I2C_OK, NULL);
TWCR = I2C_START | (1 << TWSTO);
xEventGroupSetBitsFromISR(_event_group_handle, I2C_OK, &xHigherPriorityTaskWoken);
break;
default:
break;
@@ -170,21 +173,8 @@ ISR(TWI_vect) // Прерывание TWI Тут наше все.
break;
case 0x48: // SLA+R has been transmitted. NOT ACK has been received.
printf("48\n");
switch (_work_mode)
{
case MASTER_TX:
break;
case MASTER_RX:
break;
case MASTER_TX_RX:
break;
case MASTER_PR:
TWCR = TWCR_START | (1 << TWSTO);
xEventGroupSetBitsFromISR(_event_group_handle, I2C_NACK, NULL);
break;
default:
break;
}
TWCR = I2C_START | (1 << TWSTO);
xEventGroupSetBitsFromISR(_event_group_handle, I2C_NACK, &xHigherPriorityTaskWoken);
break;
case 0x50: // Data byte has been received. ACK has been returned.
printf("50\n");
@@ -681,6 +671,10 @@ ISR(TWI_vect) // Прерывание TWI Тут наше все.
default:
break;
}
if (xHigherPriorityTaskWoken == pdTRUE)
{
portYIELD();
};
}
void DoNothing(void) // Функция пустышка, затыкать несуществующие ссылки