esp-idf/components/driver/sdspi_transaction.c

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// Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <string.h>
#include "esp_err.h"
#include "esp_log.h"
#include "sys/lock.h"
#include "soc/sdmmc_reg.h"
#include "soc/sdmmc_struct.h"
#include "driver/sdmmc_types.h"
#include "driver/sdmmc_defs.h"
#include "driver/sdmmc_host.h"
#include "sdspi_private.h"
#include "sdspi_crc.h"
static const char* TAG = "sdspi_transaction";
static _lock_t s_lock;
static bool s_app_cmd;
static uint8_t sdspi_msg_crc7(sdspi_hw_cmd_t* hw_cmd)
{
const size_t bytes_to_crc = offsetof(sdspi_hw_cmd_t, arguments) +
sizeof(hw_cmd->arguments); /* can't take address of bit fields */
return sdspi_crc7((const uint8_t *)hw_cmd, bytes_to_crc);
}
void make_hw_cmd(uint32_t opcode, uint32_t arg, int timeout_ms, sdspi_hw_cmd_t *hw_cmd)
{
hw_cmd->start_bit = 0;
hw_cmd->transmission_bit = 1;
hw_cmd->cmd_index = opcode;
hw_cmd->stop_bit = 1;
hw_cmd->r1 = 0xff;
memset(hw_cmd->response, 0xff, sizeof(hw_cmd->response));
hw_cmd->ncr = 0xff;
uint32_t arg_s = __builtin_bswap32(arg);
memcpy(hw_cmd->arguments, &arg_s, sizeof(arg_s));
hw_cmd->crc7 = sdspi_msg_crc7(hw_cmd);
hw_cmd->timeout_ms = timeout_ms;
}
esp_err_t sdspi_host_do_transaction(int slot, sdmmc_command_t *cmdinfo)
{
_lock_acquire(&s_lock);
// Convert the command to wire format
sdspi_hw_cmd_t hw_cmd;
make_hw_cmd(cmdinfo->opcode, cmdinfo->arg, cmdinfo->timeout_ms, &hw_cmd);
// Flags indicate which of the transfer types should be used
int flags = 0;
if (SCF_CMD(cmdinfo->flags) == SCF_CMD_ADTC) {
flags = SDSPI_CMD_FLAG_DATA | SDSPI_CMD_FLAG_WRITE;
} else if (SCF_CMD(cmdinfo->flags) == (SCF_CMD_ADTC | SCF_CMD_READ)) {
flags = SDSPI_CMD_FLAG_DATA;
}
// In SD host, response format is encoded using SCF_RSP_* flags which come
// as part of sdmmc_command_t from the upper layer (sdmmc_cmd.c).
// SPI mode uses different command formats. In fact, most of the commands
// use R1 response. Therefore, instead of adding another parallel set of
// response flags for the SPI mode, response format is determined here:
if (!s_app_cmd && cmdinfo->opcode == SD_SEND_IF_COND) {
flags |= SDSPI_CMD_FLAG_RSP_R7;
} else if (!s_app_cmd && cmdinfo->opcode == MMC_SEND_STATUS) {
flags |= SDSPI_CMD_FLAG_RSP_R2;
} else if (!s_app_cmd && cmdinfo->opcode == SD_READ_OCR) {
flags |= SDSPI_CMD_FLAG_RSP_R3;
} else if (s_app_cmd && cmdinfo->opcode == SD_APP_SD_STATUS) {
flags |= SDSPI_CMD_FLAG_RSP_R2;
} else {
flags |= SDSPI_CMD_FLAG_RSP_R1;
}
// Send the command and get the response.
esp_err_t ret = sdspi_host_start_command(slot, &hw_cmd,
cmdinfo->data, cmdinfo->datalen, flags);
// Extract response bytes and store them into cmdinfo structure
if (ret == ESP_OK) {
ESP_LOGV(TAG, "r1 = 0x%02x hw_cmd.r[0]=0x%08x", hw_cmd.r1, hw_cmd.response[0]);
// Some errors should be reported using return code
if (flags & SDSPI_CMD_FLAG_RSP_R1) {
cmdinfo->response[0] = hw_cmd.r1;
if (hw_cmd.r1 == 0xff) {
// No response received at all
} else if (hw_cmd.r1 & SD_SPI_R1_CMD_CRC_ERR) {
ret = ESP_ERR_INVALID_CRC;
} else if (hw_cmd.r1 & SD_SPI_R1_IDLE_STATE) {
// Idle state is handled at command layer
} else if (hw_cmd.r1 != 0) {
ESP_LOGD(TAG, "Unexpected R1 response: 0x%02x", hw_cmd.r1);
}
} else if (flags & SDSPI_CMD_FLAG_RSP_R2) {
cmdinfo->response[0] = (((uint32_t)hw_cmd.r1) << 8) | (hw_cmd.response[0] >> 24);
} else if (flags & (SDSPI_CMD_FLAG_RSP_R3 | SDSPI_CMD_FLAG_RSP_R7)) {
// Drop r1 response, only copy the other 4 bytes of data
// TODO: can we somehow preserve r1 response and keep upper layer
// same as in SD mode?
cmdinfo->response[0] = __builtin_bswap32(hw_cmd.response[0]);
}
}
// Save a flag whether the next command is expected to be an app command
if (ret == ESP_OK) {
s_app_cmd = (cmdinfo->opcode == MMC_APP_CMD);
} else {
s_app_cmd = false;
}
_lock_release(&s_lock);
return ret;
}