IRAM void esp_uart_dispatch_bottom(int uart_no) {
struct esp_uart_state *us = s_us[uart_no];
if (us == NULL) return;
cs_rbuf_t *rxb = &us->rx_buf;
cs_rbuf_t *txb = &us->tx_buf;
uint32_t int_ena = UART_INFO_INTS;
/* Determine which interrupts we want. */
if (us->rx_enabled && rxb->avail > 0) int_ena |= UART_RX_INTS;
if (txb->used > 0) int_ena |= UART_TX_INTS;
WRITE_PERI_REG(UART_INT_ENA(uart_no), int_ena);
}
IRAM NOINSTR static void esp_handle_uart_int(struct esp_uart_state *us) {
const int uart_no = us->cfg->uart_no;
/* Since both UARTs use the same int, we need to apply the mask manually. */
const unsigned int int_st = READ_PERI_REG(UART_INT_ST(uart_no)) &
READ_PERI_REG(UART_INT_ENA(uart_no));
if (int_st == 0) return;
us->stats.ints++;
if (int_st & UART_RXFIFO_OVF_INT_ST) us->stats.rx_overflows++;
if (int_st & UART_CTS_CHG_INT_ST) {
if (cts(uart_no) != 0 && tx_fifo_len(uart_no) > 0) us->stats.tx_throttles++;
}
if (int_st & (UART_RX_INTS | UART_TX_INTS)) {
if (int_st & UART_RX_INTS) us->stats.rx_ints++;
if (int_st & UART_TX_INTS) us->stats.tx_ints++;
/* Wake up the processor and disable TX and RX ints until it runs. */
WRITE_PERI_REG(UART_INT_ENA(uart_no), UART_INFO_INTS);
us->cfg->dispatch_cb(uart_no);
}
WRITE_PERI_REG(UART_INT_CLR(uart_no), int_st);
}
void
UART_IntrConfig(UART_Port uart_no, UART_IntrConfTypeDef *pUARTIntrConf)
{
uint32 reg_val = 0;
UART_ClearIntrStatus(uart_no, UART_INTR_MASK);
reg_val = READ_PERI_REG(UART_CONF1(uart_no)) & ~((UART_RX_FLOW_THRHD << UART_RX_FLOW_THRHD_S) | UART_RX_FLOW_EN) ;
reg_val |= ((pUARTIntrConf->UART_IntrEnMask & UART_RXFIFO_TOUT_INT_ENA) ?
((((pUARTIntrConf->UART_RX_TimeOutIntrThresh)&UART_RX_TOUT_THRHD) << UART_RX_TOUT_THRHD_S) | UART_RX_TOUT_EN) : 0);
reg_val |= ((pUARTIntrConf->UART_IntrEnMask & UART_RXFIFO_FULL_INT_ENA) ?
(((pUARTIntrConf->UART_RX_FifoFullIntrThresh)&UART_RXFIFO_FULL_THRHD) << UART_RXFIFO_FULL_THRHD_S) : 0);
reg_val |= ((pUARTIntrConf->UART_IntrEnMask & UART_TXFIFO_EMPTY_INT_ENA) ?
(((pUARTIntrConf->UART_TX_FifoEmptyIntrThresh)&UART_TXFIFO_EMPTY_THRHD) << UART_TXFIFO_EMPTY_THRHD_S) : 0);
WRITE_PERI_REG(UART_CONF1(uart_no), reg_val);
CLEAR_PERI_REG_MASK(UART_INT_ENA(uart_no), UART_INTR_MASK);
SET_PERI_REG_MASK(UART_INT_ENA(uart_no), pUARTIntrConf->UART_IntrEnMask);
}
bool mgos_uart_hal_init(struct mgos_uart_state *us) {
/* Start with ints disabled. */
WRITE_PERI_REG(UART_INT_ENA(us->uart_no), 0);
#ifdef RTOS_SDK
_xt_isr_mask(1 << ETS_UART_INUM);
_xt_isr_attach(ETS_UART_INUM, (void *) esp_uart_isr, NULL);
#else
ETS_INTR_DISABLE(ETS_UART_INUM);
ETS_UART_INTR_ATTACH(esp_uart_isr, NULL);
#endif
return true;
}
/******************************************************************************
* FunctionName : uart_config
* Description : Internal used function
* UART0 used for data TX/RX, RX buffer size is 0x100, interrupt enabled
* UART1 just used for debug output
* Parameters : uart_no, use UART0 or UART1 defined ahead
* Returns : NONE
*******************************************************************************/
static void ICACHE_FLASH_ATTR
uart_config(uint8 uart_no)
{
if (uart_no == UART1) {
PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO2_U, FUNC_U1TXD_BK);
PIN_PULLUP_DIS(PERIPHS_IO_MUX_GPIO2_U);
} else {
/* rcv_buff size is 0x100 */
ETS_UART_INTR_ATTACH(uart0_rx_intr_handler, &(UartDev.rcv_buff));
PIN_FUNC_SELECT(PERIPHS_IO_MUX_U0TXD_U, FUNC_U0TXD);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_U0RXD_U, 0); // FUNC_U0RXD==0
PIN_PULLUP_DIS (PERIPHS_IO_MUX_U0TXD_U); //now done in serbridgeInitPins
PIN_PULLUP_DIS (PERIPHS_IO_MUX_U0RXD_U);
}
uart_div_modify(uart_no, UART_CLK_FREQ / UartDev.baut_rate);
if (uart_no == UART1) //UART 1 always 8 N 1
WRITE_PERI_REG(UART_CONF0(uart_no),
CALC_UARTMODE(EIGHT_BITS, NONE_BITS, ONE_STOP_BIT));
else
WRITE_PERI_REG(UART_CONF0(uart_no),
CALC_UARTMODE(UartDev.data_bits, UartDev.parity, UartDev.stop_bits));
//clear rx and tx fifo,not ready
SET_PERI_REG_MASK(UART_CONF0(uart_no), UART_RXFIFO_RST | UART_TXFIFO_RST);
CLEAR_PERI_REG_MASK(UART_CONF0(uart_no), UART_RXFIFO_RST | UART_TXFIFO_RST);
if (uart_no == UART0) {
// Configure RX interrupt conditions as follows: trigger rx-full when there are 127 characters
// in the buffer, trigger rx-timeout when the fifo is non-empty and nothing further has been
// received for 4 character periods.
// Set the hardware flow-control to trigger when the FIFO holds 100 characters, although
// we don't really expect the signals to actually be wired up to anything. It doesn't hurt
// to set the threshold here...
// We do not enable framing error interrupts 'cause they tend to cause an interrupt avalanche
// and instead just poll for them when we get a std RX interrupt.
WRITE_PERI_REG(UART_CONF1(uart_no),
((127 & UART_RXFIFO_FULL_THRHD) << UART_RXFIFO_FULL_THRHD_S) |
((100 & UART_RX_FLOW_THRHD) << UART_RX_FLOW_THRHD_S) |
UART_RX_FLOW_EN |
(4 & UART_RX_TOUT_THRHD) << UART_RX_TOUT_THRHD_S |
UART_RX_TOUT_EN);
SET_PERI_REG_MASK(UART_INT_ENA(uart_no), UART_RXFIFO_FULL_INT_ENA | UART_RXFIFO_TOUT_INT_ENA);
} else {
WRITE_PERI_REG(UART_CONF1(uart_no),
((UartDev.rcv_buff.TrigLvl & UART_RXFIFO_FULL_THRHD) << UART_RXFIFO_FULL_THRHD_S));
}
//clear all interrupt
WRITE_PERI_REG(UART_INT_CLR(uart_no), 0xffff);
}
void mgos_uart_hal_dispatch_bottom(struct mgos_uart_state *us) {
uint32_t int_ena = UART_INFO_INTS;
/* Determine which interrupts we want. */
if (us->rx_enabled) {
if (mgos_uart_rxb_free(us) > 0) {
int_ena |= UART_RX_INTS;
}
if (adj_rx_fifo_full_thresh(us)) {
int_ena |= UART_RXFIFO_FULL_INT_ENA;
}
}
if (us->tx_buf.len > 0) int_ena |= UART_TX_INTS;
WRITE_PERI_REG(UART_INT_ENA(us->uart_no), int_ena);
}
void esp_uart_print_status(void *arg) {
struct esp_uart_state *us = (struct esp_uart_state *) arg;
struct esp_uart_stats *s = &us->stats;
struct esp_uart_stats *ps = &us->prev_stats;
int uart_no = us->cfg->uart_no;
fprintf(
stderr,
"UART%d ints %u/%u/%u; rx en %d bytes %u buf %u fifo %u, ovf %u, lcs %u; "
"tx %u %u %u, thr %u; hf %u i 0x%03x ie 0x%03x cts %d\n",
uart_no, s->ints - ps->ints, s->rx_ints - ps->rx_ints,
s->tx_ints - ps->tx_ints, us->rx_enabled, s->rx_bytes - ps->rx_bytes,
us->rx_buf.used, rx_fifo_len(us->cfg->uart_no),
s->rx_overflows - ps->rx_overflows,
s->rx_linger_conts - ps->rx_linger_conts, s->tx_bytes - ps->tx_bytes,
us->tx_buf.used, tx_fifo_len(us->cfg->uart_no),
s->tx_throttles - ps->tx_throttles, system_get_free_heap_size(),
READ_PERI_REG(UART_INT_RAW(uart_no)),
READ_PERI_REG(UART_INT_ENA(uart_no)), cts(uart_no));
memcpy(ps, s, sizeof(*s));
}
void HardwareSerial::begin(const uint32_t baud/* = 9600*/)
{
//TODO: Move to params!
UartDev.baut_rate = (UartBautRate)baud;
UartDev.parity = NONE_BITS;
UartDev.exist_parity = STICK_PARITY_DIS;
UartDev.stop_bits = ONE_STOP_BIT;
UartDev.data_bits = EIGHT_BITS;
ETS_UART_INTR_ATTACH((void*)uart0_rx_intr_handler, &(UartDev.rcv_buff));
PIN_PULLUP_DIS(PERIPHS_IO_MUX_U0TXD_U);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_U0TXD_U, FUNC_U0TXD);
uart_div_modify(uart, UART_CLK_FREQ / (UartDev.baut_rate));
WRITE_PERI_REG(UART_CONF0(uart), UartDev.exist_parity
| UartDev.parity
| (UartDev.stop_bits << UART_STOP_BIT_NUM_S)
| (UartDev.data_bits << UART_BIT_NUM_S));
//clear rx and tx fifo,not ready
SET_PERI_REG_MASK(UART_CONF0(uart), UART_RXFIFO_RST | UART_TXFIFO_RST);
CLEAR_PERI_REG_MASK(UART_CONF0(uart), UART_RXFIFO_RST | UART_TXFIFO_RST);
//set rx fifo trigger
WRITE_PERI_REG(UART_CONF1(uart), (UartDev.rcv_buff.TrigLvl & UART_RXFIFO_FULL_THRHD) << UART_RXFIFO_FULL_THRHD_S);
//clear all interrupt
WRITE_PERI_REG(UART_INT_CLR(uart), 0xffff);
//enable rx_interrupt
SET_PERI_REG_MASK(UART_INT_ENA(uart), UART_RXFIFO_FULL_INT_ENA);
ETS_UART_INTR_ENABLE();
delay(10);
Serial.println("\r\n"); // after SPAM :)
}
/******************************************************************************
* FunctionName : uart0_rx_intr_handler
* Description : Internal used function
* UART0 interrupt handler, add self handle code inside
* Parameters : void *para - point to ETS_UART_INTR_ATTACH's arg
* Returns : NONE
*******************************************************************************/
static void // must not use ICACHE_FLASH_ATTR !
uart0_rx_intr_handler(void *para)
{
// we assume that uart1 has interrupts disabled (it uses the same interrupt vector)
uint8 uart_no = UART0;
const uint32 one_sec = 1000000; // one second in usecs
// we end up largely ignoring framing errors and we just print a warning every second max
if (READ_PERI_REG(UART_INT_RAW(uart_no)) & UART_FRM_ERR_INT_RAW) {
uint32 now = system_get_time();
if (last_frm_err == 0 || (now - last_frm_err) > one_sec) {
#ifdef UART_DBG
os_printf("UART framing error (bad baud rate?)\n");
#endif
last_frm_err = now;
}
// clear rx fifo (apparently this is not optional at this point)
SET_PERI_REG_MASK(UART_CONF0(uart_no), UART_RXFIFO_RST);
CLEAR_PERI_REG_MASK(UART_CONF0(uart_no), UART_RXFIFO_RST);
// reset framing error
WRITE_PERI_REG(UART_INT_CLR(UART0), UART_FRM_ERR_INT_CLR);
// once framing errors are gone for 10 secs we forget about having seen them
} else if (last_frm_err != 0 && (system_get_time() - last_frm_err) > 10*one_sec) {
last_frm_err = 0;
}
if (UART_RXFIFO_FULL_INT_ST == (READ_PERI_REG(UART_INT_ST(uart_no)) & UART_RXFIFO_FULL_INT_ST)
|| UART_RXFIFO_TOUT_INT_ST == (READ_PERI_REG(UART_INT_ST(uart_no)) & UART_RXFIFO_TOUT_INT_ST))
{
#ifdef UART_DBG
os_printf("stat:%02X",*(uint8 *)UART_INT_ENA(uart_no));
#endif
ETS_UART_INTR_DISABLE();
system_os_post(recvTaskPrio, 0, 0);
}
}
uint32_t esp_uart_int_mask(int uart_no) {
return READ_PERI_REG(UART_INT_ENA(uart_no));
}
void miot_uart_dev_deinit(struct miot_uart_state *us) {
WRITE_PERI_REG(UART_INT_ENA(us->uart_no), 0);
s_us[us->uart_no] = NULL;
}
int esp_uart_init(struct esp_uart_config *cfg) {
if (cfg == NULL || !esp_uart_validate_config(cfg)) return 0;
struct esp_uart_state *us = s_us[cfg->uart_no];
if (us != NULL) {
s_us[cfg->uart_no] = NULL;
esp_uart_deinit(us);
}
us = calloc(1, sizeof(*us));
us->cfg = cfg;
cs_rbuf_init(&us->rx_buf, cfg->rx_buf_size);
cs_rbuf_init(&us->tx_buf, cfg->tx_buf_size);
ETS_INTR_DISABLE(ETS_UART_INUM);
uart_div_modify(cfg->uart_no, UART_CLK_FREQ / cfg->baud_rate);
if (cfg->uart_no == 0) {
PIN_PULLUP_DIS(PERIPHS_IO_MUX_U0TXD_U);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_U0TXD_U, FUNC_U0TXD);
if (cfg->swap_rxtx_ctsrts) {
SET_PERI_REG_MASK(PERIPHS_DPORT_BASEADDR + HOST_INF_SEL,
PERI_IO_UART0_PIN_SWAP);
} else {
CLEAR_PERI_REG_MASK(PERIPHS_DPORT_BASEADDR + HOST_INF_SEL,
PERI_IO_UART0_PIN_SWAP);
}
} else {
PIN_PULLUP_DIS(PERIPHS_IO_MUX_GPIO2_U);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO2_U, FUNC_U1TXD_BK);
if (cfg->swap_rxtx_ctsrts) {
SET_PERI_REG_MASK(PERIPHS_DPORT_BASEADDR + HOST_INF_SEL,
PERI_IO_UART1_PIN_SWAP);
} else {
CLEAR_PERI_REG_MASK(PERIPHS_DPORT_BASEADDR + HOST_INF_SEL,
PERI_IO_UART1_PIN_SWAP);
}
}
unsigned int conf0 = 0b011100; /* 8-N-1 */
if (cfg->tx_fc_ena) {
conf0 |= UART_TX_FLOW_EN;
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTCK_U, FUNC_U0CTS);
}
WRITE_PERI_REG(UART_CONF0(cfg->uart_no), conf0);
unsigned int conf1 = cfg->rx_fifo_full_thresh;
conf1 |= (cfg->tx_fifo_empty_thresh << 8);
if (cfg->rx_fifo_alarm >= 0) {
conf1 |= UART_RX_TOUT_EN | ((cfg->rx_fifo_alarm & 0x7f) << 24);
}
if (cfg->rx_fc_ena && cfg->rx_fifo_fc_thresh > 0) {
/* UART_RX_FLOW_EN will be set in uart_start. */
conf1 |= ((cfg->rx_fifo_fc_thresh & 0x7f) << 16);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTDO_U, FUNC_U0RTS);
}
WRITE_PERI_REG(UART_CONF1(cfg->uart_no), conf1);
if (cfg->status_interval_ms > 0) {
os_timer_disarm(&us->status_timer);
os_timer_setfn(&us->status_timer, esp_uart_print_status, us);
os_timer_arm(&us->status_timer, cfg->status_interval_ms, 1 /* repeat */);
}
s_us[cfg->uart_no] = us;
/* Start with TX and RX ints disabled. */
WRITE_PERI_REG(UART_INT_ENA(cfg->uart_no), UART_INFO_INTS);
ETS_UART_INTR_ATTACH(esp_uart_isr, NULL);
ETS_INTR_ENABLE(ETS_UART_INUM);
return 1;
}
void cmd_loop() {
while(1) {
/* Wait for a command */
while(ub.command == NULL) { }
esp_command_req_t *command = ub.command;
ub.command = NULL;
/* provide easy access for 32-bit data words */
uint32_t *data_words = (uint32_t *)command->data_buf;
/* Send command response header */
esp_command_response_t resp = {
.resp = 1,
.op_ret = command->op,
.len_ret = 0, /* esptool.py ignores this value */
.value = 0,
};
/* ESP_READ_REG is the only command that needs to write into the
'resp' structure before we send it back. */
if (command->op == ESP_READ_REG && command->data_len == 4) {
resp.value = REG_READ(data_words[0]);
}
/* Send the command response. */
SLIP_send_frame_delimiter();
SLIP_send_frame_data_buf(&resp, sizeof(esp_command_response_t));
if(command->data_len > MAX_WRITE_BLOCK+16) {
SLIP_send_frame_data(ESP_BAD_DATA_LEN);
SLIP_send_frame_data(0xEE);
SLIP_send_frame_delimiter();
continue;
}
/* ... some commands will insert in-frame response data
between here and when we send the end of the frame */
esp_command_error error = ESP_CMD_NOT_IMPLEMENTED;
int status = 0;
/* First stage of command processing - before sending error/status */
switch (command->op) {
case ESP_ERASE_FLASH:
error = verify_data_len(command, 0) || SPIEraseChip();
break;
case ESP_ERASE_REGION:
/* Params for ERASE_REGION are addr, len */
error = verify_data_len(command, 8) || handle_flash_erase(data_words[0], data_words[1]);
break;
case ESP_SET_BAUD:
/* ESP_SET_BAUD sends two args, we ignore the second one */
error = verify_data_len(command, 8);
/* actual baud setting happens after we send the reply */
break;
case ESP_READ_FLASH:
error = verify_data_len(command, 16);
/* actual data is sent after we send the reply */
break;
case ESP_FLASH_VERIFY_MD5:
/* unsure why the MD5 command has 4 params but we only pass 2 of them,
but this is in ESP32 ROM so we can't mess with it.
*/
error = verify_data_len(command, 16) || handle_flash_get_md5sum(data_words[0], data_words[1]);
break;
case ESP_FLASH_BEGIN:
/* parameters (interpreted differently to ROM flasher):
0 - erase_size (used as total size to write)
1 - num_blocks (ignored)
2 - block_size (should be MAX_WRITE_BLOCK, relies on num_blocks * block_size >= erase_size)
3 - offset (used as-is)
*/
if (command->data_len == 16 && data_words[2] != MAX_WRITE_BLOCK) {
error = ESP_BAD_BLOCKSIZE;
} else {
error = verify_data_len(command, 16) || handle_flash_begin(data_words[0], data_words[3]);
}
break;
case ESP_FLASH_DEFLATED_BEGIN:
/* parameters:
0 - uncompressed size
1 - num_blocks (based on compressed size)
2 - block_size (should be MAX_WRITE_BLOCK, total bytes over serial = num_blocks * block_size)
3 - offset (used as-is)
*/
if (command->data_len == 16 && data_words[2] != MAX_WRITE_BLOCK) {
error = ESP_BAD_BLOCKSIZE;
} else {
error = verify_data_len(command, 16) || handle_flash_deflated_begin(data_words[0], data_words[1] * data_words[2], data_words[3]); }
break;
case ESP_FLASH_DATA:
case ESP_FLASH_DEFLATED_DATA:
/* ACK DATA commands immediately, then process them a few lines down,
allowing next command to buffer */
if(is_in_flash_mode()) {
error = get_flash_error();
int payload_len = command->data_len - 16;
if (data_words[0] != payload_len) {
/* First byte of data payload header is length (repeated) as a word */
error = ESP_BAD_DATA_LEN;
}
uint8_t data_checksum = calculate_checksum(command->data_buf + 16, payload_len);
if (data_checksum != command->checksum) {
error = ESP_BAD_DATA_CHECKSUM;
}
}
else {
error = ESP_NOT_IN_FLASH_MODE;
}
break;
case ESP_FLASH_END:
case ESP_FLASH_DEFLATED_END:
error = handle_flash_end();
break;
case ESP_SPI_SET_PARAMS:
/* data params: fl_id, total_size, block_size, sector_Size, page_size, status_mask */
error = verify_data_len(command, 24) || handle_spi_set_params(data_words, &status);
break;
case ESP_SPI_ATTACH:
/* parameter is 'hspi mode' (0, 1 or a pin mask for ESP32. Ignored on ESP8266.) */
error = verify_data_len(command, 4) || handle_spi_attach(data_words[0]);
break;
case ESP_WRITE_REG:
/* params are addr, value, mask (ignored), delay_us (ignored) */
error = verify_data_len(command, 16);
if (error == ESP_OK) {
REG_WRITE(data_words[0], data_words[1]);
}
break;
case ESP_READ_REG:
/* actual READ_REG operation happens higher up */
error = verify_data_len(command, 4);
break;
case ESP_MEM_BEGIN:
error = verify_data_len(command, 16) || handle_mem_begin(data_words[0], data_words[3]);
break;
case ESP_MEM_DATA:
error = handle_mem_data(command->data_buf + 16, command->data_len - 16);
break;
case ESP_MEM_END:
error = verify_data_len(command, 8) || handle_mem_finish();
break;
case ESP_RUN_USER_CODE:
/* Returning from here will run user code, ie standard boot process
This command does not send a response.
*/
return;
}
SLIP_send_frame_data(error);
SLIP_send_frame_data(status);
SLIP_send_frame_delimiter();
/* Some commands need to do things after after sending this response */
if (error == ESP_OK) {
switch(command->op) {
case ESP_SET_BAUD:
ets_delay_us(10000);
uart_div_modify(0, baud_rate_to_divider(data_words[0]));
ets_delay_us(1000);
break;
case ESP_READ_FLASH:
/* args are: offset, length, block_size, max_in_flight */
handle_flash_read(data_words[0], data_words[1], data_words[2],
data_words[3]);
break;
case ESP_FLASH_DATA:
/* drop into flashing mode, discard 16 byte payload header */
handle_flash_data(command->data_buf + 16, command->data_len - 16);
break;
case ESP_FLASH_DEFLATED_DATA:
handle_flash_deflated_data(command->data_buf + 16, command->data_len - 16);
break;
case ESP_FLASH_DEFLATED_END:
case ESP_FLASH_END:
/* passing 0 as parameter for ESP_FLASH_END means reboot now */
if (data_words[0] == 0) {
/* Flush the FLASH_END response before rebooting */
#ifdef ESP32
uart_tx_flush(0);
#endif
ets_delay_us(10000);
software_reset();
}
break;
case ESP_MEM_END:
if (data_words[1] != 0) {
void (*entrypoint_fn)(void) = (void (*))data_words[1];
/* this is a little different from the ROM loader,
which exits the loader routine and _then_ calls this
function. But for our purposes so far, having a bit of
extra stuff on the stack doesn't really matter.
*/
entrypoint_fn();
}
break;
}
}
}
}
extern uint32_t _bss_start;
extern uint32_t _bss_end;
void __attribute__((used)) stub_main();
#ifdef ESP8266
__asm__ (
".global stub_main_8266\n"
".literal_position\n"
".align 4\n"
"stub_main_8266:\n"
/* ESP8266 wrapper for "stub_main()" manipulates the return address in
* a0, so 'return' from here runs user code.
*
* After setting a0, we jump directly to stub_main_inner() which is a
* normal C function
*
* Adapted from similar approach used by Cesanta Software for ESP8266
* flasher stub.
*
*/
"movi a0, 0x400010a8;"
"j stub_main;");
#endif
/* This function is called from stub_main, with return address
reset to point to user code. */
void stub_main()
{
const uint32_t greeting = 0x4941484f; /* OHAI */
/* this points to stub_main now, clear for next boot */
ets_set_user_start(0);
/* zero bss */
for(uint32_t *p = &_bss_start; p < &_bss_end; p++) {
*p = 0;
}
SLIP_send(&greeting, 4);
/* All UART reads come via uart_isr */
ub.reading_buf = ub.buf_a;
ets_isr_attach(ETS_UART0_INUM, uart_isr, NULL);
SET_PERI_REG_MASK(UART_INT_ENA(0), UART_RX_INTS);
ets_isr_unmask(1 << ETS_UART0_INUM);
/* Configure default SPI flash functionality.
Can be overriden later by esptool.py. */
#ifdef ESP8266
SelectSpiFunction();
#else
uint32_t spiconfig = ets_efuse_get_spiconfig();
uint32_t strapping = REG_READ(GPIO_STRAP_REG);
/* If GPIO1 (U0TXD) is pulled low and no other boot mode is
set in efuse, assume HSPI flash mode (same as normal boot)
*/
if (spiconfig == 0 && (strapping & 0x1c) == 0x08) {
spiconfig = 1; /* HSPI flash mode */
}
spi_flash_attach(spiconfig, 0);
#endif
SPIParamCfg(0, 16*1024*1024, FLASH_BLOCK_SIZE, FLASH_SECTOR_SIZE,
FLASH_PAGE_SIZE, FLASH_STATUS_MASK);
cmd_loop();
/* if cmd_loop returns, it's due to ESP_RUN_USER_CODE command. */
return;
}
void
UART_SetIntrEna(UART_Port uart_no, uint32 ena_mask)
{
SET_PERI_REG_MASK(UART_INT_ENA(uart_no), ena_mask);
}
