C++ (Cpp) spi_context_update_txの例

コード例 #1

ファイル: spi_ll_stm32.c プロジェクト: rsalveti/zephyr

/* Shift a SPI frame as slave. */
static void spi_stm32_shift_s(SPI_TypeDef *spi, struct spi_stm32_data *data)
{
	u8_t tx_frame;
	u8_t rx_frame;

	tx_frame = spi_stm32_next_tx(data);
	if (LL_SPI_IsActiveFlag_TXE(spi)) {
		LL_SPI_TransmitData8(spi, tx_frame);
		/* The update is ignored if TX is off. */
		spi_context_update_tx(&data->ctx, 1);
	}

	if (LL_SPI_IsActiveFlag_RXNE(spi)) {
		rx_frame = LL_SPI_ReceiveData8(spi);
		if (spi_context_rx_on(&data->ctx)) {
			*data->ctx.rx_buf = rx_frame;
			spi_context_update_rx(&data->ctx, 1);
		}
	}
}

コード例 #2

ファイル: spi_dw.c プロジェクト: milinddeore/zephyr

static void push_data(struct device *dev)
{
	const struct spi_dw_config *info = dev->config->config_info;
	struct spi_dw_data *spi = dev->driver_data;
	u32_t data = 0U;
	u32_t f_tx;

	DBG_COUNTER_INIT();

	if (spi_context_rx_on(&spi->ctx)) {
		f_tx = DW_SPI_FIFO_DEPTH - read_txflr(info->regs) -
			read_rxflr(info->regs);
		if ((int)f_tx < 0) {
			f_tx = 0U; /* if rx-fifo is full, hold off tx */
		}
	} else {
		f_tx = DW_SPI_FIFO_DEPTH - read_txflr(info->regs);
	}

	while (f_tx) {
		if (spi_context_tx_buf_on(&spi->ctx)) {
			switch (spi->dfs) {
			case 1:
				data = UNALIGNED_GET((u8_t *)
						     (spi->ctx.tx_buf));
				break;
			case 2:
				data = UNALIGNED_GET((u16_t *)
						     (spi->ctx.tx_buf));
				break;
#ifndef CONFIG_ARC
			case 4:
				data = UNALIGNED_GET((u32_t *)
						     (spi->ctx.tx_buf));
				break;
#endif
			}
		} else if (spi_context_rx_on(&spi->ctx)) {
			/* No need to push more than necessary */
			if ((int)(spi->ctx.rx_len - spi->fifo_diff) <= 0) {
				break;
			}

			data = 0U;
		} else if (spi_context_tx_on(&spi->ctx)) {
			data = 0U;
		} else {
			/* Nothing to push anymore */
			break;
		}

		write_dr(data, info->regs);

		spi_context_update_tx(&spi->ctx, spi->dfs, 1);
		spi->fifo_diff++;

		f_tx--;

		DBG_COUNTER_INC();
	}

	if (!spi_context_tx_on(&spi->ctx)) {
		/* prevents any further interrupts demanding TX fifo fill */
		write_txftlr(0, info->regs);
	}

	LOG_DBG("Pushed: %d", DBG_COUNTER_RESULT());
}