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arch/esp32_spi: Add check to see if the TX_FIFO is empty

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to avoid sending empty data

Signed-off-by: nuttxs <zhaoqing.zhang@sony.com>
This commit is contained in:
nuttxs 2025-02-25 10:49:57 +08:00 • committed by Xiang Xiao
parent ded5a6aae5
commit e1ffc1075d
2 changed files with 13 additions and 0 deletions
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11
arch/xtensa/src/esp32/esp32_spi.c
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@ -849,6 +849,7 @@ static void esp32_spi_dma_exchange(struct esp32_spi_priv_s *priv,
const uintptr_t spi_miso_dlen_reg = SPI_MISO_DLEN_REG(id);
const uintptr_t spi_user_reg = SPI_USER_REG(id);
const uintptr_t spi_cmd_reg = SPI_CMD_REG(id);
const uintptr_t spi_dma_rstatus = SPI_DMA_RSTATUS_REG(id);
DEBUGASSERT((txbuffer != NULL) || (rxbuffer != NULL));
@ -940,6 +941,16 @@ static void esp32_spi_dma_exchange(struct esp32_spi_priv_s *priv,
esp32_spi_reset_regbits(spi_user_reg, SPI_USR_MISO_M);
}
if (priv->config->flags & ESP32_SPI_IO_W)
{
/* Wait until SPI TX FIFO is not empty */
while ((getreg32(spi_dma_rstatus) & SPI_DMA_TX_FIFO_EMPTY) != 0)
{
;
}
}
esp32_spi_set_regbits(spi_cmd_reg, SPI_USR_M);
esp32_spi_sem_waitdone(priv);

2
arch/xtensa/src/esp32/hardware/esp32_spi.h
View file

@ -2782,6 +2782,8 @@
#define SPI_DMA_RSTATUS_OFFSET (0x148)
#define SPI_DMA_RSTATUS_REG(i) (REG_SPI_BASE(i) + SPI_DMA_RSTATUS_OFFSET)
#define SPI_DMA_TX_FIFO_EMPTY (BIT(31))
/* SPI_DMA_OUT_STATUS : RO ;bitpos:[31:0] ;default: 32'b0 ; */
/* Description: spi dma read data from memory status. */