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Posted to commits@mynewt.apache.org by GitBox <gi...@apache.org> on 2022/01/11 11:18:01 UTC
[GitHub] [mynewt-core] sjanc commented on a change in pull request #2638: i2c scan for bus driver usage
sjanc commented on a change in pull request #2638:
URL: https://github.com/apache/mynewt-core/pull/2638#discussion_r782048948
##########
File path: hw/bus/drivers/i2c_da1469x/src/i2c_da1469x.c
##########
@@ -623,13 +623,97 @@ i2c_da1469x_disable(struct bus_dev *bdev)
return 0;
}
-static const struct bus_dev_ops bus_i2c_da1469x_dma_ops = {
- .init_node = i2c_da1469x_init_node,
- .enable = i2c_da1469x_enable,
- .configure = i2c_da1469x_configure,
- .read = i2c_da1469x_read,
- .write = i2c_da1469x_write,
- .disable = i2c_da1469x_disable,
+static int
+i2c_da1469x_probe(struct bus_i2c_dev *dev, uint16_t address, os_time_t timeout)
+{
+ I2C_Type *i2c_regs;
+ int rc;
+ int i;
+ int pin_sda;
+ int pin_scl;
+ uint32_t half_clock_ticks = os_cputime_usecs_to_ticks(5);
+ const struct da1469x_i2c_hw *i2c_hw;
+ int nack;
+ bool reenable = false;
+ BUS_DEBUG_VERIFY_DEV(dev);
+
+ rc = os_mutex_pend(&dev->bdev.lock, timeout);
+ if (rc == 0) {
+ i2c_hw = &da1469x_i2c[dev->cfg.i2c_num];
+ i2c_regs = da1469x_i2c[dev->cfg.i2c_num].regs;
+
+ pin_scl = dev->cfg.pin_scl;
+ pin_sda = dev->cfg.pin_sda;
+ if (i2c_regs->I2C_ENABLE_REG & I2C_I2C_ENABLE_REG_I2C_EN_Msk) {
+ i2c_regs->I2C_ENABLE_REG &= ~(1U << I2C_I2C_ENABLE_REG_I2C_EN_Pos);
+ reenable = true;
+ }
+ hal_gpio_write(pin_scl, 1);
+ hal_gpio_write(pin_sda, 1);
+ mcu_gpio_set_pin_function(pin_scl, MCU_GPIO_MODE_OUTPUT_OPEN_DRAIN,
+ MCU_GPIO_FUNC_GPIO);
+ mcu_gpio_set_pin_function(pin_sda, MCU_GPIO_MODE_OUTPUT_OPEN_DRAIN,
+ MCU_GPIO_FUNC_GPIO);
+
+ /* Start condition */
+ hal_gpio_write(pin_sda, 0);
+ hal_gpio_write(pin_scl, 0);
+ address <<= 1;
+ os_cputime_delay_ticks(half_clock_ticks);
+ for (i = 7; i >= 0; --i) {
+ hal_gpio_write(pin_sda, address & (1 << i));
+ os_cputime_delay_ticks(half_clock_ticks);
+ hal_gpio_write(pin_scl, 1);
+ os_cputime_delay_ticks(half_clock_ticks);
+ hal_gpio_write(pin_scl, 0);
+ }
+ mcu_gpio_set_pin_function(pin_sda, MCU_GPIO_MODE_INPUT_PULLUP,
+ MCU_GPIO_FUNC_GPIO);
+ os_cputime_delay_ticks(half_clock_ticks);
+
+ hal_gpio_write(pin_scl, 1);
+ while (hal_gpio_read(pin_scl) == 0) ;
+ nack = hal_gpio_read(pin_sda);
+ os_cputime_delay_ticks(half_clock_ticks);
+ hal_gpio_write(pin_scl, 0);
+ /* Stop condition */
+ mcu_gpio_set_pin_function(pin_sda, MCU_GPIO_MODE_OUTPUT, MCU_GPIO_FUNC_GPIO);
+ hal_gpio_write(pin_sda, 0);
+ os_cputime_delay_ticks(half_clock_ticks);
+ hal_gpio_write(pin_scl, 1);
+ os_cputime_delay_ticks(half_clock_ticks);
+ hal_gpio_write(pin_sda, 1);
+ mcu_gpio_set_pin_function(pin_scl, MCU_GPIO_MODE_OUTPUT_OPEN_DRAIN,
+ MCU_GPIO_FUNC_GPIO);
+ mcu_gpio_set_pin_function(pin_sda, MCU_GPIO_MODE_OUTPUT_OPEN_DRAIN,
+ MCU_GPIO_FUNC_GPIO);
+
+ mcu_gpio_set_pin_function(pin_scl, MCU_GPIO_MODE_OUTPUT_OPEN_DRAIN,
+ i2c_hw->scl_func);
+ mcu_gpio_set_pin_function(pin_sda, MCU_GPIO_MODE_OUTPUT_OPEN_DRAIN,
+ i2c_hw->sda_func);
+ if (reenable) {
+ i2c_regs->I2C_ENABLE_REG |= ~(1U << I2C_I2C_ENABLE_REG_I2C_EN_Pos);
+ }
+ rc = nack ? SYS_ENOENT : 0;
Review comment:
this result in mixing OS_ (from os_muteX_pend()) and SYS_ errors, not sure if this really matters but it seems to appear in more functions
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