drivers: CAN: MCP2515: Read INT GPIO pin to check interrupt status (a64f9986) · Commits · Wenxi XU / zephyr

drivers/can/can_mcp2515.c

+26 −6

Original line number	Diff line number	Diff line
		@@ -533,11 +533,26 @@ static void mcp2515_recover(struct device *dev, s32_t timeout)

		static void mcp2515_handle_interrupts(struct device *dev)
		{
		const struct mcp2515_config *dev_cfg = DEV_CFG(dev);
		struct mcp2515_data *dev_data = DEV_DATA(dev);
		u32_t pin;
		int ret;
		u8_t canintf;

		mcp2515_cmd_read_reg(dev, MCP2515_ADDR_CANINTF, &canintf, 1);
		/* Loop until INT pin is high (all interrupt flags handled) */
		while (1) {
		ret = mcp2515_cmd_read_reg(dev, MCP2515_ADDR_CANINTF,
		&canintf, 1);
		if (ret != 0) {
		LOG_ERR("Couldn't read INTF register %d", ret);
		continue;
		}

		if (canintf == 0) {
		/* No interrupt flags set */
		break;
		}

		while (canintf != 0) {
		if (canintf & MCP2515_CANINTF_RX0IF) {
		mcp2515_rx(dev, 0);
		}
		@@ -566,9 +581,14 @@ static void mcp2515_handle_interrupts(struct device *dev)
		mcp2515_cmd_bit_modify(dev, MCP2515_ADDR_CANINTF, canintf,
		~canintf);

		/* check that no new interrupts happened while clearing known
		* ones */
		mcp2515_cmd_read_reg(dev, MCP2515_ADDR_CANINTF, &canintf, 1);
		/* Break from loop if INT pin is no longer low */
		ret = gpio_pin_read(dev_data->int_gpio, dev_cfg->int_pin, &pin);
		if (ret != 0) {
		LOG_ERR("Couldn't read INT pin");
		} else if (pin != 0) {
		/* All interrupt flags handled */
		break;
		}
		}
		}

		@@ -610,7 +630,7 @@ static int mcp2515_init(struct device *dev)
		struct mcp2515_data *dev_data = DEV_DATA(dev);
		int ret;

		k_sem_init(&dev_data->int_sem, 0, UINT_MAX);
		k_sem_init(&dev_data->int_sem, 0, 1);
		k_mutex_init(&dev_data->mutex);
		k_sem_init(&dev_data->tx_sem, 3, 3);
		k_sem_init(&dev_data->tx_cb[0].sem, 0, 1);

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