a0776b2f21
Previously SDSPI host driver would rely on retry count when waiting for the card to read or write data. This caused different timeout times depending on CPU frequency and card clock frequency. In practice, card performance does not depend on these two factors. This change uses timeout_ms field of sdmmc_command_t introduced previously for SDMMC host. Fixes https://esp32.com/viewtopic.php?f=2&t=3440&p=16037 and similar issues related to SDSPI timeouts.
123 lines
4.7 KiB
C
123 lines
4.7 KiB
C
// Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <string.h>
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#include "esp_err.h"
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#include "esp_log.h"
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#include "sys/lock.h"
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#include "soc/sdmmc_reg.h"
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#include "soc/sdmmc_struct.h"
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#include "driver/sdmmc_types.h"
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#include "driver/sdmmc_defs.h"
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#include "driver/sdmmc_host.h"
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#include "sdspi_private.h"
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#include "sdspi_crc.h"
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static const char* TAG = "sdspi_transaction";
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static _lock_t s_lock;
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static bool s_app_cmd;
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static uint8_t sdspi_msg_crc7(sdspi_hw_cmd_t* hw_cmd)
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{
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const size_t bytes_to_crc = offsetof(sdspi_hw_cmd_t, arguments) +
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sizeof(hw_cmd->arguments); /* can't take address of bit fields */
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return sdspi_crc7((const uint8_t *)hw_cmd, bytes_to_crc);
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}
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void make_hw_cmd(uint32_t opcode, uint32_t arg, int timeout_ms, sdspi_hw_cmd_t *hw_cmd)
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{
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hw_cmd->start_bit = 0;
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hw_cmd->transmission_bit = 1;
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hw_cmd->cmd_index = opcode;
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hw_cmd->stop_bit = 1;
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hw_cmd->r1 = 0xff;
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memset(hw_cmd->response, 0xff, sizeof(hw_cmd->response));
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hw_cmd->ncr = 0xff;
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uint32_t arg_s = __builtin_bswap32(arg);
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memcpy(hw_cmd->arguments, &arg_s, sizeof(arg_s));
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hw_cmd->crc7 = sdspi_msg_crc7(hw_cmd);
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hw_cmd->timeout_ms = timeout_ms;
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}
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esp_err_t sdspi_host_do_transaction(int slot, sdmmc_command_t *cmdinfo)
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{
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_lock_acquire(&s_lock);
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// Convert the command to wire format
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sdspi_hw_cmd_t hw_cmd;
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make_hw_cmd(cmdinfo->opcode, cmdinfo->arg, cmdinfo->timeout_ms, &hw_cmd);
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// Flags indicate which of the transfer types should be used
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int flags = 0;
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if (SCF_CMD(cmdinfo->flags) == SCF_CMD_ADTC) {
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flags = SDSPI_CMD_FLAG_DATA | SDSPI_CMD_FLAG_WRITE;
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} else if (SCF_CMD(cmdinfo->flags) == (SCF_CMD_ADTC | SCF_CMD_READ)) {
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flags = SDSPI_CMD_FLAG_DATA;
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}
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// In SD host, response format is encoded using SCF_RSP_* flags which come
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// as part of sdmmc_command_t from the upper layer (sdmmc_cmd.c).
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// SPI mode uses different command formats. In fact, most of the commands
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// use R1 response. Therefore, instead of adding another parallel set of
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// response flags for the SPI mode, response format is determined here:
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if (!s_app_cmd && cmdinfo->opcode == SD_SEND_IF_COND) {
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flags |= SDSPI_CMD_FLAG_RSP_R7;
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} else if (!s_app_cmd && cmdinfo->opcode == MMC_SEND_STATUS) {
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flags |= SDSPI_CMD_FLAG_RSP_R2;
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} else if (!s_app_cmd && cmdinfo->opcode == SD_READ_OCR) {
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flags |= SDSPI_CMD_FLAG_RSP_R3;
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} else if (s_app_cmd && cmdinfo->opcode == SD_APP_SD_STATUS) {
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flags |= SDSPI_CMD_FLAG_RSP_R2;
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} else {
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flags |= SDSPI_CMD_FLAG_RSP_R1;
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}
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// Send the command and get the response.
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esp_err_t ret = sdspi_host_start_command(slot, &hw_cmd,
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cmdinfo->data, cmdinfo->datalen, flags);
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// Extract response bytes and store them into cmdinfo structure
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if (ret == ESP_OK) {
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ESP_LOGV(TAG, "r1 = 0x%02x hw_cmd.r[0]=0x%08x", hw_cmd.r1, hw_cmd.response[0]);
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// Some errors should be reported using return code
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if (flags & SDSPI_CMD_FLAG_RSP_R1) {
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cmdinfo->response[0] = hw_cmd.r1;
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if (hw_cmd.r1 == 0xff) {
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// No response received at all
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} else if (hw_cmd.r1 & SD_SPI_R1_CMD_CRC_ERR) {
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ret = ESP_ERR_INVALID_CRC;
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} else if (hw_cmd.r1 & SD_SPI_R1_IDLE_STATE) {
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// Idle state is handled at command layer
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} else if (hw_cmd.r1 != 0) {
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ESP_LOGD(TAG, "Unexpected R1 response: 0x%02x", hw_cmd.r1);
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}
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} else if (flags & SDSPI_CMD_FLAG_RSP_R2) {
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cmdinfo->response[0] = (((uint32_t)hw_cmd.r1) << 8) | (hw_cmd.response[0] >> 24);
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} else if (flags & (SDSPI_CMD_FLAG_RSP_R3 | SDSPI_CMD_FLAG_RSP_R7)) {
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// Drop r1 response, only copy the other 4 bytes of data
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// TODO: can we somehow preserve r1 response and keep upper layer
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// same as in SD mode?
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cmdinfo->response[0] = __builtin_bswap32(hw_cmd.response[0]);
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}
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}
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// Save a flag whether the next command is expected to be an app command
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if (ret == ESP_OK) {
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s_app_cmd = (cmdinfo->opcode == MMC_APP_CMD);
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} else {
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s_app_cmd = false;
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}
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_lock_release(&s_lock);
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return ret;
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}
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