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https://gitlab.rtems.org/rtems/rtos/rtems.git
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f7a204e3d7
The driver didn't return with an error on (for example) a NACK on the bus. This adds the expected error return. Due to the new case that a transfer can be interrupted on an error, there were some new edge cases. This patch therefore also fixes these edge cases by removing the transfer_state that more or less duplicated the interrupt states. Fixes #4591
64 lines
1.3 KiB
C
64 lines
1.3 KiB
C
/*
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* Copyright (c) 2016 embedded brains GmbH. All rights reserved.
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*
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* embedded brains GmbH
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* Dornierstr. 4
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* 82178 Puchheim
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* Germany
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* <info@embedded-brains.de>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#ifndef LIBBSP_ARM_ATSAM_ATSAM_I2C_H
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#define LIBBSP_ARM_ATSAM_ATSAM_I2C_H
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#include <libchip/chip.h>
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#include <libchip/include/pio.h>
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#include <bsp.h>
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#include <rtems/thread.h>
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#include <dev/i2c/i2c.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#define TWI_AMOUNT_PINS 2
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typedef struct {
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i2c_bus base;
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Twihs *regs;
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/* First message and number of messages that have to be processed. */
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i2c_msg *msgs;
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uint32_t msg_todo;
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/* Information about the current transfer. */
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bool stop_request;
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uint32_t current_msg_todo;
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uint8_t *current_msg_byte;
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/* Error information that can be returned to the task */
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uint32_t err;
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uint32_t output_clock;
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rtems_binary_semaphore sem;
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rtems_vector_number irq;
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} atsam_i2c_bus;
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int i2c_bus_register_atsam(
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const char *bus_path,
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Twihs *register_base,
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rtems_vector_number irq,
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const Pin pins[TWI_AMOUNT_PINS]
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);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* LIBBSP_ARM_ATSAM_ATSAM_I2C_H */
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