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spi_slave: fix the issue rx dma get broken by master unexpected transaction

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michael 2018-09-06 14:47:45 +08:00 committed by Michael (XIAO Xufeng)
parent aab43e6dda
commit 2d748b5d38
1 changed files with 34 additions and 2 deletions
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34
components/driver/spi_slave.c
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@ -60,6 +60,7 @@ static const char *SPI_TAG = "spi_slave";
#endif
typedef struct {
int id;
spi_slave_interface_config_t cfg;
intr_handle_t intr;
spi_dev_t *hw;
@ -80,6 +81,27 @@ static spi_slave_t *spihost[3];
static void IRAM_ATTR spi_intr(void *arg);
static inline bool bus_is_iomux(spi_slave_t *host)
{
return host->flags&SPICOMMON_BUSFLAG_NATIVE_PINS;
}
static void freeze_cs(spi_slave_t *host)
{
gpio_matrix_in(GPIO_FUNC_IN_HIGH, spi_periph_signal[host->id].spics_in, false);
}
// Use this function instead of cs_initial to avoid overwrite the output config
// This is used in test by internal gpio matrix connections
static inline void restore_cs(spi_slave_t *host)
{
if (bus_is_iomux(host)) {
gpio_iomux_in(host->cfg.spics_io_num, spi_periph_signal[host->id].spics_in);
} else {
gpio_matrix_in(host->cfg.spics_io_num, spi_periph_signal[host->id].spics_in, false);
}
}
esp_err_t spi_slave_initialize(spi_host_device_t host, const spi_bus_config_t *bus_config, const spi_slave_interface_config_t *slave_config, int dma_chan)
{
bool spi_chan_claimed, dma_chan_claimed;
@ -107,6 +129,7 @@ esp_err_t spi_slave_initialize(spi_host_device_t host, const spi_bus_config_t *b
}
memset(spihost[host], 0, sizeof(spi_slave_t));
memcpy(&spihost[host]->cfg, slave_config, sizeof(spi_slave_interface_config_t));
spihost[host]->id = host;
err = spicommon_bus_initialize_io(host, bus_config, dma_chan, SPICOMMON_BUSFLAG_SLAVE|bus_config->flags, &spihost[host]->flags);
if (err!=ESP_OK) {
@ -114,7 +137,10 @@ esp_err_t spi_slave_initialize(spi_host_device_t host, const spi_bus_config_t *b
goto cleanup;
}
gpio_set_direction(slave_config->spics_io_num, GPIO_MODE_INPUT);
spicommon_cs_initialize(host, slave_config->spics_io_num, 0, !(spihost[host]->flags&SPICOMMON_BUSFLAG_NATIVE_PINS));
spicommon_cs_initialize(host, slave_config->spics_io_num, 0, !bus_is_iomux(spihost[host]));
// The slave DMA suffers from unexpected transactions. Forbid reading if DMA is enabled by disabling the CS line.
if (dma_chan != 0) freeze_cs(spihost[host]);
spihost[host]->dma_chan = dma_chan;
if (dma_chan != 0) {
//See how many dma descriptors we need and allocate them
@ -357,6 +383,9 @@ static void SPI_SLAVE_ISR_ATTR spi_intr(void *arg)
if (!host->hw->slave.trans_done) return;
if (host->cur_trans) {
// When DMA is enabled, the slave rx dma suffers from unexpected transactions. Forbid reading until transaction ready.
if (host->dma_chan != 0) freeze_cs(host);
//when data of cur_trans->length are all sent, the slv_rdata_bit
//will be the length sent-1 (i.e. cur_trans->length-1 ), otherwise
//the length sent.
@ -465,6 +494,9 @@ static void SPI_SLAVE_ISR_ATTR spi_intr(void *arg)
host->hw->user.usr_mosi = (trans->tx_buffer == NULL) ? 0 : 1;
host->hw->user.usr_miso = (trans->rx_buffer == NULL) ? 0 : 1;
//The slave rx dma get disturbed by unexpected transaction. Only connect the CS when slave is ready.
if (host->dma_chan != 0) restore_cs(host);
//Kick off transfer
host->hw->cmd.usr = 1;
if (host->cfg.post_setup_cb) host->cfg.post_setup_cb(trans);