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fix(spi_master): allow to use cs_ena_pretrans in full duplex mode without command and address phases

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This commit is contained in:
michael 2018-06-19 20:38:17 +08:00 committed by bot
parent 1cd9949f2d
commit 8676830e61
2 changed files with 20 additions and 10 deletions
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28
components/driver/spi_master.c
View File

@ -333,8 +333,7 @@ esp_err_t spi_bus_add_device(spi_host_device_t host, const spi_device_interface_
SPI_CHECK(freecs!=NO_CS, "no free cs pins for host", ESP_ERR_NOT_FOUND);
//The hardware looks like it would support this, but actually setting cs_ena_pretrans when transferring in full
//duplex mode does absolutely nothing on the ESP32.
SPI_CHECK(dev_config->cs_ena_pretrans <= 1 || (dev_config->flags & SPI_DEVICE_HALFDUPLEX), "cs pretrans delay > 1 incompatible with full-duplex", ESP_ERR_INVALID_ARG);
SPI_CHECK( dev_config->cs_ena_pretrans != 1 || (dev_config->address_bits == 0 && dev_config->command_bits == 0) ||
SPI_CHECK( dev_config->cs_ena_pretrans <= 1 || (dev_config->address_bits == 0 && dev_config->command_bits == 0) ||
(dev_config->flags & SPI_DEVICE_HALFDUPLEX), "In full-duplex mode, only support cs pretrans delay = 1 and without address_bits and command_bits", ESP_ERR_INVALID_ARG);
duty_cycle = (dev_config->duty_cycle_pos==0? 128: dev_config->duty_cycle_pos);
@ -711,17 +710,26 @@ static void SPI_MASTER_ISR_ATTR spi_intr(void *arg)
//Configure bit sizes, load addr and command
int cmdlen;
if ( trans->flags & SPI_TRANS_VARIABLE_CMD ) {
cmdlen = ((spi_transaction_ext_t*)trans)->command_bits;
} else {
cmdlen = dev->cfg.command_bits;
}
int addrlen;
if ( trans->flags & SPI_TRANS_VARIABLE_ADDR ) {
addrlen = ((spi_transaction_ext_t*)trans)->address_bits;
if (!(dev->cfg.flags & SPI_DEVICE_HALFDUPLEX) && dev->cfg.cs_ena_pretrans != 0) {
/* The command and address phase is not compatible with cs_ena_pretrans
* in full duplex mode.
*/
cmdlen = 0;
addrlen = 0;
} else {
addrlen = dev->cfg.address_bits;
if (trans->flags & SPI_TRANS_VARIABLE_CMD) {
cmdlen = ((spi_transaction_ext_t *)trans)->command_bits;
} else {
cmdlen = dev->cfg.command_bits;
}
if (trans->flags & SPI_TRANS_VARIABLE_ADDR) {
addrlen = ((spi_transaction_ext_t *)trans)->address_bits;
} else {
addrlen = dev->cfg.address_bits;
}
}
host->hw->user1.usr_addr_bitlen=addrlen-1;
host->hw->user2.usr_command_bitlen=cmdlen-1;
host->hw->user.usr_addr=addrlen?1:0;

2
docs/en/api-reference/peripherals/spi_master.rst
View File

@ -384,6 +384,8 @@ Known Issues
2. Full duplex mode is not compatible with the *dummy bit workaround*, hence the frequency is limited. See :ref:`dummy
bit speed-up workaround <dummy_bit_workaround>`.
3. ``cs_ena_pretrans`` is not compatible with command, address phases in full duplex mode.
Application Example
-------------------