LoadProhibited Exception in driver/i2s.c
Posted: Sun Jan 15, 2017 2:29 pm
I'm trying to get I2S to work, and I've hit a problem.
I call i2s_push_sample() like so, just for test purposes and to avoid other error sources with a zero sample:
This is the I2S driver function thats being called, which is the current esp-idf SDK driver. The line that fails is "*data_ptr++ = *sample++;", xtensa-esp32-elf-addr2line output says "esp-idf/components/driver/i2s.c:767 (discriminator 3)".
This is the error message from the UART:
I attached a JTAG debugger and set a breakpoint at the offending line, this is the memory of the variables, maybe this is helpful?
I have a theory that the "const char *sample" variable is in a memory region that may not be read, address 00000000 sure looks suspicious to me. I don't know how to move into a different memory region though, I tried declaring the variable like like this:
but that didn't help.
Any ideas?
I call i2s_push_sample() like so, just for test purposes and to avoid other error sources with a zero sample:
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const uint32_t zero_sample[2] = { 0 };
void render_sample_block(short *short_sample_buff, int no_samples) {
i2s_push_sample(I2S_NUM_0, (const char*) zero_sample, portMAX_DELAY);
}
Code: Select all
int i2s_push_sample(i2s_port_t i2s_num, const char *sample, TickType_t ticks_to_wait)
{
int i, bytes_to_push = 0;
char *data_ptr;
I2S_CHECK((i2s_num < I2S_NUM_MAX), "i2s_num error", ESP_FAIL);
if (p_i2s_obj[i2s_num]->tx->rw_pos == p_i2s_obj[i2s_num]->tx->buf_size || p_i2s_obj[i2s_num]->tx->curr_ptr == NULL) {
if (xQueueReceive(p_i2s_obj[i2s_num]->tx->queue, &p_i2s_obj[i2s_num]->tx->curr_ptr, ticks_to_wait) == pdFALSE) {
return 0;
}
ESP_LOGD(I2S_TAG, "rw_pos: %d, buf_size: %d, curr_ptr: %d", p_i2s_obj[i2s_num]->tx->rw_pos, p_i2s_obj[i2s_num]->tx->buf_size, (int)p_i2s_obj[i2s_num]->tx->curr_ptr);
p_i2s_obj[i2s_num]->tx->rw_pos = 0;
}
data_ptr = (char*)p_i2s_obj[i2s_num]->tx->curr_ptr;
data_ptr += p_i2s_obj[i2s_num]->tx->rw_pos;
for (i = 0; i < p_i2s_obj[i2s_num]->bytes_per_sample; i++) {
*data_ptr++ = *sample++;
bytes_to_push ++;
}
[...removed...]
}
This is the error message from the UART:
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Guru Meditation Error of type LoadProhibited occurred on core 0. Exception was unhandled.
Register dump:
PC : 0x401087f4
PS : 0x00060830
A0 : 0x801065a6
A1 : 0x3ffd0d60
A2 : 0x00000000
A3 : 0x00000000
A4 : 0x00000000
A5 : 0x00000000
A6 : 0x000003c0
A7 : 0x3ffb6fc0
A8 : 0x3ffbc474
A9 : 0x3ffd4290
A10 : 0x00000002
A11 : 0x00000000
A12 : 0x3ffbc87c
A13 : 0x00000000
A14 : 0x3ffbc8b0
A15 : 0x46640406
SAR : 0x00000004
EXCCAUSE: 0x0000001c
EXCVADDR: 0x00000000
LBEG : 0x4000c2e0
LEND : 0x4000c2f6
LCOUNT : 0xffffffff
Backtrace: 0x401087f4:0x3ffd0d60 0x401065a6:0x3ffd0d90 0x40106686:0x3ffd0db0
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const char *data_ptr : 0x3FFD335D <Hex>
Address 0 - 3 4 - 7 8 - B C - F
3FFD32F0 00000000 00000000 00000000 00000000
3FFD3300 00000000 00000000 00000000 00000000
3FFD3310 00000000 00000000 40000080 5C33FD3F
3FFD3320 6437FD3F 6C3BFD3F 743FFD3F 7C43FD3F
3FFD3330 8447FD3F 8C4BFD3F 944FFD3F 9C53FD3F
3FFD3340 A457FD3F AC5BFD3F B45FFD3F BC63FD3F
3FFD3350 C467FD3F 00000000 08040080 00000000
3FFD3360 00000000 00000000 00000000 00000000
3FFD3370 00000000 00000000 00000000 00000000
3FFD3380 00000000 00000000 00000000 00000000
3FFD3390 00000000 00000000 00000000 00000000
3FFD33A0 00000000 00000000 00000000 00000000
3FFD33B0 00000000 00000000 00000000 00000000
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const char *sample : 0x1 <Hex>
Address 0 - 3 4 - 7 8 - B C - F
00000000 00000000 00000000 00000000 00000000
00000010 00000000 00000000 00000000 00000000
00000020 00000000 00000000 00000000 00000000
00000030 00000000 00000000 00000000 00000000
00000040 00000000 00000000 00000000 00000000
00000050 00000000 00000000 00000000 00000000
00000060 00000000 00000000 00000000 00000000
00000070 00000000 00000000 00000000 00000000
00000080 00000000 00000000 00000000 00000000
00000090 00000000 00000000 00000000 00000000
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DRAM_ATTR const uint32_t zero_sample[2] = { 0 };Any ideas?
