136 lines
3.2 KiB
C
136 lines
3.2 KiB
C
/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2020-11-15 xckhmf First Verison
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* 2021-11-27 chenyingchun fix _master_xfer bug
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*
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*/
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#include <rtdevice.h>
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#include <nrfx_twi_twim.h>
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#include <nrfx_twim.h>
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#include <drv_i2c.h>
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#if defined(BSP_USING_I2C0) || defined(BSP_USING_I2C1)
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typedef struct
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{
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nrf_twim_frequency_t freq;
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uint32_t scl_pin;
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uint32_t sda_pin;
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nrfx_twim_t twi_instance;
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}drv_i2c_cfg_t;
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#ifdef BSP_USING_I2C0
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static drv_i2c_cfg_t drv_i2c_0 =
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{
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.freq = NRF_TWIM_FREQ_400K,
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.scl_pin = BSP_I2C0_SCL_PIN,
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.sda_pin = BSP_I2C0_SDA_PIN,
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.twi_instance = NRFX_TWIM_INSTANCE(0)
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};
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static struct rt_i2c_bus_device i2c0_bus;
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#endif
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#ifdef BSP_USING_I2C1
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static drv_i2c_cfg_t drv_i2c_1 =
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{
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.freq = NRF_TWIM_FREQ_400K,
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.scl_pin = BSP_I2C1_SCL_PIN,
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.sda_pin = BSP_I2C1_SDA_PIN,
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.twi_instance = NRFX_TWIM_INSTANCE(1)
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};
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static struct rt_i2c_bus_device i2c1_bus;
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#endif
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static int twi_master_init(struct rt_i2c_bus_device *bus)
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{
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nrfx_err_t rtn;
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nrfx_twim_config_t config = NRFX_TWIM_DEFAULT_CONFIG(0,0);
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drv_i2c_cfg_t *p_cfg = bus->priv;
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nrfx_twim_t const * p_instance = &p_cfg->twi_instance;
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config.frequency = p_cfg->freq;
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config.scl = p_cfg->scl_pin;
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config.sda = p_cfg->sda_pin;
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nrfx_twi_twim_bus_recover(config.scl,config.sda);
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rtn = nrfx_twim_init(p_instance,&config,NULL,NULL);
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if (rtn != NRFX_SUCCESS)
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{
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return rtn;
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}
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nrfx_twim_enable(p_instance);
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return 0;
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}
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static rt_size_t _master_xfer(struct rt_i2c_bus_device *bus,
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struct rt_i2c_msg msgs[],
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rt_uint32_t num)
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{
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struct rt_i2c_msg *msg;
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nrfx_twim_t const *p_instance = &((drv_i2c_cfg_t *)bus->priv)->twi_instance;
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nrfx_err_t ret = NRFX_ERROR_INTERNAL;
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uint32_t no_stop_flag = 0;
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rt_int32_t i = 0;
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for (i = 0; i < num; i++)
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{
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msg = &msgs[i];
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nrfx_twim_xfer_desc_t xfer = NRFX_TWIM_XFER_DESC_TX(msg->addr, msg->buf, msg->len);
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if (msg->flags & RT_I2C_RD)
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{
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xfer.type = NRFX_TWIM_XFER_RX;
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}
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else
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{
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xfer.type = NRFX_TWIM_XFER_TX;
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if (msg->flags & RT_I2C_NO_READ_ACK)
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{
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no_stop_flag = NRFX_TWIM_FLAG_TX_NO_STOP;
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}
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}
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ret = nrfx_twim_xfer(p_instance, &xfer, no_stop_flag);
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if (ret != NRFX_SUCCESS)
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{
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goto out;
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}
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}
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out:
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return i;
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}
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static const struct rt_i2c_bus_device_ops _i2c_ops =
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{
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_master_xfer,
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NULL,
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NULL,
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};
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int rt_hw_i2c_init(void)
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{
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#ifdef BSP_USING_I2C0
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i2c0_bus.ops= &_i2c_ops;
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i2c0_bus.timeout = 0;
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i2c0_bus.priv = (void *)&drv_i2c_0;
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twi_master_init(&i2c0_bus);
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rt_i2c_bus_device_register(&i2c0_bus, "i2c0");
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#endif
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#ifdef BSP_USING_I2C1
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i2c1_bus.ops= &_i2c_ops;
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i2c1_bus.timeout = 0;
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i2c1_bus.priv = (void *)&drv_i2c_1;
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twi_master_init(&i2c1_bus);
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rt_i2c_bus_device_register(&i2c1_bus, "i2c1");
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#endif
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return 0;
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}
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INIT_BOARD_EXPORT(rt_hw_i2c_init);
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#endif /* defined(BSP_USING_I2C0) || defined(BSP_USING_I2C1) */
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