diff --git a/bsp/bluetrum/libraries/hal_drivers/SConscript b/bsp/bluetrum/libraries/hal_drivers/SConscript index 11a76e192a..014ba58879 100644 --- a/bsp/bluetrum/libraries/hal_drivers/SConscript +++ b/bsp/bluetrum/libraries/hal_drivers/SConscript @@ -16,6 +16,8 @@ if GetDepend('RT_USING_SERIAL'): if GetDepend('RT_USING_SDIO'): src += ['drv_sdio.c'] +if GetDepend('RT_USING_I2C'): + src += ['drv_soft_i2c.c'] group = DefineGroup('Drivers', src, depend = [''], CPPPATH = path) objs = [group] diff --git a/bsp/bluetrum/libraries/hal_drivers/drv_soft_i2c.c b/bsp/bluetrum/libraries/hal_drivers/drv_soft_i2c.c new file mode 100644 index 0000000000..94dfa6c5f1 --- /dev/null +++ b/bsp/bluetrum/libraries/hal_drivers/drv_soft_i2c.c @@ -0,0 +1,247 @@ +/* + * Copyright (c) 2020-2021, Bluetrum Development Team + * + * SPDX-License-Identifier: Apache-2.0 + * + * Change Logs: + * Date Author Notes + * 2021-01-07 greedyhao first version + */ + +#include +#include "drv_soft_i2c.h" + +#ifdef RT_USING_I2C + +// #define DRV_DEBUG +#define LOG_TAG "drv.i2c" +#include + +#if !defined(BSP_USING_I2C1) && !defined(BSP_USING_I2C2) && !defined(BSP_USING_I2C3) && !defined(BSP_USING_I2C4) +#error "Please define at least one BSP_USING_I2Cx" +/* this driver can be disabled at menuconfig → RT-Thread Components → Device Drivers */ +#endif + +static const struct ab32_soft_i2c_config soft_i2c_config[] = +{ +#ifdef BSP_USING_I2C1 + I2C1_BUS_CONFIG, +#endif +#ifdef BSP_USING_I2C2 + I2C2_BUS_CONFIG, +#endif +#ifdef BSP_USING_I2C3 + I2C3_BUS_CONFIG, +#endif +#ifdef BSP_USING_I2C4 + I2C4_BUS_CONFIG, +#endif +}; + +static struct ab32_i2c i2c_obj[sizeof(soft_i2c_config) / sizeof(soft_i2c_config[0])] = {0}; + +/** + * This function initializes the i2c pin. + * + * @param ab32 i2c dirver class. + */ +static void ab32_i2c_gpio_init(struct ab32_i2c *i2c) +{ + struct ab32_soft_i2c_config* cfg = (struct ab32_soft_i2c_config*)i2c->ops.data; + + cfg->scl_mode = PIN_MODE_OUTPUT_OD; + cfg->sda_mode = PIN_MODE_OUTPUT_OD; + rt_pin_mode(cfg->scl, cfg->scl_mode); + rt_pin_mode(cfg->sda, cfg->sda_mode); + + rt_pin_write(cfg->scl, PIN_HIGH); + rt_pin_write(cfg->sda, PIN_HIGH); +} + +/** + * This function sets the sda pin. + * + * @param data ab32 config class. + * @param state The sda pin state. + */ +static void ab32_set_sda(void *data, rt_int32_t state) +{ + struct ab32_soft_i2c_config* cfg = (struct ab32_soft_i2c_config*)data; + + if (cfg->sda_mode == PIN_MODE_INPUT_PULLUP) { + cfg->sda_mode = PIN_MODE_OUTPUT_OD; + rt_pin_mode(cfg->sda, cfg->sda_mode); + } + + if (state) + { + rt_pin_write(cfg->sda, PIN_HIGH); + } + else + { + rt_pin_write(cfg->sda, PIN_LOW); + } +} + +/** + * This function sets the scl pin. + * + * @param data ab32 config class. + * @param state The scl pin state. + */ +static void ab32_set_scl(void *data, rt_int32_t state) +{ + struct ab32_soft_i2c_config* cfg = (struct ab32_soft_i2c_config*)data; + + if (cfg->scl_mode == PIN_MODE_INPUT_PULLUP) { + cfg->scl_mode = PIN_MODE_OUTPUT_OD; + rt_pin_mode(cfg->scl, cfg->scl_mode); + } + + if (state) + { + rt_pin_write(cfg->scl, PIN_HIGH); + } + else + { + rt_pin_write(cfg->scl, PIN_LOW); + } +} + +/** + * This function gets the sda pin state. + * + * @param data The sda pin state. + */ +static rt_int32_t ab32_get_sda(void *data) +{ + struct ab32_soft_i2c_config* cfg = (struct ab32_soft_i2c_config*)data; + + if (cfg->sda_mode != PIN_MODE_INPUT_PULLUP) { + cfg->sda_mode = PIN_MODE_INPUT_PULLUP; + rt_pin_mode(cfg->sda, cfg->sda_mode); + } + + return rt_pin_read(cfg->sda); +} + +/** + * This function gets the scl pin state. + * + * @param data The scl pin state. + */ +static rt_int32_t ab32_get_scl(void *data) +{ + struct ab32_soft_i2c_config* cfg = (struct ab32_soft_i2c_config*)data; + + if (cfg->scl_mode == PIN_MODE_INPUT_PULLUP) { + cfg->scl_mode = PIN_MODE_INPUT_PULLUP; + rt_pin_mode(cfg->scl, cfg->scl_mode); + } + + return rt_pin_read(cfg->scl); +} + +/** + * The time delay function. + * + * @param us microseconds. + */ +static void ab32_udelay(rt_uint32_t us) +{ + rt_uint32_t ticks; + rt_uint32_t told, tnow, tcnt = 0; + rt_uint32_t reload = TMR0PR; + + ticks = us * reload / (1000 / RT_TICK_PER_SECOND); + told = TMR0CNT; + while (1) + { + tnow = TMR0CNT; + if (tnow != told) + { + if (tnow < told) + { + tcnt += told - tnow; + } + else + { + tcnt += reload - tnow + told; + } + told = tnow; + if (tcnt >= ticks) + { + break; + } + } + } +} + +static const struct rt_i2c_bit_ops ab32_bit_ops_default = +{ + .data = RT_NULL, + .set_sda = ab32_set_sda, + .set_scl = ab32_set_scl, + .get_sda = ab32_get_sda, + .get_scl = ab32_get_scl, + .udelay = ab32_udelay, + .delay_us = 1, + .timeout = 100 +}; + +/** + * if i2c is locked, this function will unlock it + * + * @param cfg ab32 config class + * + * @return RT_EOK indicates successful unlock. + */ +static rt_err_t ab32_i2c_bus_unlock(const struct ab32_soft_i2c_config *cfg) +{ + rt_int32_t i = 0; + + if (PIN_LOW == rt_pin_read(cfg->sda)) + { + while (i++ < 9) + { + rt_pin_write(cfg->scl, PIN_HIGH); + ab32_udelay(100); + rt_pin_write(cfg->scl, PIN_LOW); + ab32_udelay(100); + } + } + if (PIN_LOW == rt_pin_read(cfg->sda)) + { + return -RT_ERROR; + } + + return RT_EOK; +} + +/* I2C initialization function */ +int rt_hw_i2c_init(void) +{ + rt_size_t obj_num = sizeof(i2c_obj) / sizeof(struct ab32_i2c); + rt_err_t result; + + for (int i = 0; i < obj_num; i++) + { + i2c_obj[i].ops = ab32_bit_ops_default; + i2c_obj[i].ops.data = (void*)&soft_i2c_config[i]; + i2c_obj[i].i2c2_bus.priv = &i2c_obj[i].ops; + ab32_i2c_gpio_init(&i2c_obj[i]); + result = rt_i2c_bit_add_bus(&i2c_obj[i].i2c2_bus, soft_i2c_config[i].bus_name); + RT_ASSERT(result == RT_EOK); + ab32_i2c_bus_unlock(&soft_i2c_config[i]); + + LOG_D("software simulation %s init done, pin scl: %d, pin sda %d", + soft_i2c_config[i].bus_name, + soft_i2c_config[i].scl, + soft_i2c_config[i].sda); + } + + return RT_EOK; +} +INIT_BOARD_EXPORT(rt_hw_i2c_init); + +#endif diff --git a/bsp/bluetrum/libraries/hal_drivers/drv_soft_i2c.h b/bsp/bluetrum/libraries/hal_drivers/drv_soft_i2c.h new file mode 100644 index 0000000000..9e26cf8ba4 --- /dev/null +++ b/bsp/bluetrum/libraries/hal_drivers/drv_soft_i2c.h @@ -0,0 +1,72 @@ +/* + * Copyright (c) 2020-2021, Bluetrum Development Team + * + * SPDX-License-Identifier: Apache-2.0 + * + * Change Logs: + * Date Author Notes + * 2021-01-07 greedyhao first version + */ + +#ifndef __DRV_I2C__ +#define __DRV_I2C__ + +#include +#include +#include + +/* ab32 config class */ +struct ab32_soft_i2c_config +{ + rt_uint8_t scl; + rt_uint8_t sda; + rt_uint8_t sda_mode; + rt_uint8_t scl_mode; + const char *bus_name; +}; + +/* ab32 i2c dirver class */ +struct ab32_i2c +{ + struct rt_i2c_bit_ops ops; + struct rt_i2c_bus_device i2c2_bus; +}; + +#ifdef BSP_USING_I2C1 +#define I2C1_BUS_CONFIG \ + { \ + .scl = BSP_I2C1_SCL_PIN, \ + .sda = BSP_I2C1_SDA_PIN, \ + .bus_name = "i2c1", \ + } +#endif + +#ifdef BSP_USING_I2C2 +#define I2C2_BUS_CONFIG \ + { \ + .scl = BSP_I2C2_SCL_PIN, \ + .sda = BSP_I2C2_SDA_PIN, \ + .bus_name = "i2c2", \ + } +#endif + +#ifdef BSP_USING_I2C3 +#define I2C3_BUS_CONFIG \ + { \ + .scl = BSP_I2C3_SCL_PIN, \ + .sda = BSP_I2C3_SDA_PIN, \ + .bus_name = "i2c3", \ + } +#endif + +#ifdef BSP_USING_I2C4 +#define I2C4_BUS_CONFIG \ + { \ + .scl = BSP_I2C4_SCL_PIN, \ + .sda = BSP_I2C4_SDA_PIN, \ + .bus_name = "i2c4", \ + } +#endif +int rt_hw_i2c_init(void); + +#endif