Cameron/pico-examples
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This commit is contained in:
graham sanderson
2021-01-20 10:49:34 -06:00
commit 46078742c7
245 changed files with 21157 additions and 0 deletions
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14
flash/xip_stream/CMakeLists.txt Normal file
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add_executable(flash_xip_stream
flash_xip_stream.c
)
target_link_libraries(flash_xip_stream
pico_stdlib
hardware_dma
)
# create map/bin/hex file etc.
pico_add_extra_outputs(flash_xip_stream)
# add url via pico_set_program_url
example_auto_set_url(flash_xip_stream)

88
flash/xip_stream/flash_xip_stream.c Normal file
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/**
* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <stdio.h>
#include <stdlib.h>
#include "pico/stdlib.h"
#include "hardware/dma.h"
#include "hardware/regs/addressmap.h"
#include "hardware/structs/xip_ctrl.h"
#include "random_test_data.h"
// The XIP has some internal hardware that can stream a linear access sequence
// to a DMAable FIFO, while the system is still doing random accesses on flash
// code + data.
uint32_t buf[count_of(random_test_data)];
int main() {
stdio_init_all();
for (int i = 0; i < count_of(random_test_data); ++i)
buf[i] = 0;
// This example won't work with PICO_NO_FLASH builds. Note that XIP stream
// can be made to work in these cases, if you enable some XIP mode first
// (e.g. via calling flash_enter_cmd_xip() in ROM). However, you will get
// much better performance by DMAing directly from the SSI's FIFOs, as in
// this way you can clock data continuously on the QSPI bus, rather than a
// series of short transfers.
if ((uint32_t) &random_test_data[0] >= SRAM_BASE) {
printf("You need to run this example from flash!\n");
exit(-1);
}
// Transfer started by writing nonzero value to stream_ctr. stream_ctr
// will count down as the transfer progresses. Can terminate early by
// writing 0 to stream_ctr.
// It's a good idea to drain the FIFO first!
printf("Starting stream from %p\n", random_test_data);
//tag::start_stream[]
while (!(xip_ctrl_hw->stat & XIP_STAT_FIFO_EMPTY))
(void) xip_ctrl_hw->stream_fifo;
xip_ctrl_hw->stream_addr = (uint32_t) &random_test_data[0];
xip_ctrl_hw->stream_ctr = count_of(random_test_data);
//end::start_stream[]
// Start DMA transfer from XIP stream FIFO to our buffer in memory. Use
// the auxiliary bus slave for the DMA<-FIFO accesses, to avoid stalling
// the DMA against general XIP traffic. Doesn't really matter for this
// example, but it can have a huge effect on DMA throughput.
printf("Starting DMA\n");
//tag::start_dma[]
const uint dma_chan = 0;
dma_channel_config cfg = dma_channel_get_default_config(dma_chan);
channel_config_set_read_increment(&cfg, false);
channel_config_set_write_increment(&cfg, true);
channel_config_set_dreq(&cfg, DREQ_XIP_STREAM);
dma_channel_configure(
dma_chan,
&cfg,
(void *) buf, // Write addr
(const void *) XIP_AUX_BASE, // Read addr
count_of(random_test_data), // Transfer count
true // Start immediately!
);
//end::start_dma[]
dma_channel_wait_for_finish_blocking(dma_chan);
printf("DMA complete\n");
bool mismatch = false;
for (int i = 0; i < count_of(random_test_data); ++i) {
if (random_test_data[i] != buf[i]) {
printf("Data mismatch: %08x (actual) != %08x (expected)\n", buf[i], random_test_data[i]);
mismatch = true;
break;
}
printf("%08x%c", buf[i], i % 8 == 7 ? '\n' : ' ');
}
if (!mismatch)
printf("Data check OK\n");
}

160
flash/xip_stream/random_test_data.h Normal file
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@@ -0,0 +1,160 @@
const uint32_t random_test_data[] = {
0x76654e22, 0x47207265, 0x616e6e6f,
0x76694720, 0x6f592065, 0x70552075,
0x570a0a22, 0x65722765, 0x206f6e20,
0x61727473, 0x7265676e, 0x6f742073,
0x766f6c20, 0x6f590a65, 0x6e6b2075,
0x7420776f, 0x72206568, 0x73656c75,
0x646e6120, 0x206f7320, 0x49206f64,
0x6620410a, 0x206c6c75, 0x6d6d6f63,
0x656d7469, 0x7327746e, 0x61687720,
0x27492074, 0x6874206d, 0x696b6e69,
0x6f20676e, 0x6f590a66, 0x6f772075,
0x6e646c75, 0x67207427, 0x74207465,
0x20736968, 0x6d6f7266, 0x796e6120,
0x68746f20, 0x67207265, 0x0a0a7975,
0x756a2049, 0x77207473, 0x616e6e61,
0x6c657420, 0x6f79206c, 0x6f682075,
0x27492077, 0x6566206d, 0x6e696c65,
0x6f470a67, 0x20617474, 0x656b616d,
0x756f7920, 0x646e7520, 0x74737265,
0x0a646e61, 0x76654e0a, 0x67207265,
0x616e6e6f, 0x76696720, 0x6f792065,
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0x2061206c, 0x2065696c, 0x20646e61
};