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Fix garbage at start when doing repeated capture with non-po2 sample size

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Luke Wren 2021-02-11 12:24:19 +00:00 committed by Graham Sanderson
parent 475a726c0d
commit 98422e1afc
1 changed files with 4 additions and 1 deletions
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5
pio/logic_analyser/logic_analyser.c
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@ -65,7 +65,10 @@ void logic_analyser_init(PIO pio, uint sm, uint pin_base, uint pin_count, float
void logic_analyser_arm(PIO pio, uint sm, uint dma_chan, uint32_t *capture_buf, size_t capture_size_words,
uint trigger_pin, bool trigger_level) {
pio_sm_set_enabled(pio, sm, false);
// Need to clear _input shift counter_, as well as FIFO, because there may be
// partial ISR contents left over from a prevoius run. sm_restart does this.
pio_sm_clear_fifos(pio, sm);
pio_sm_restart(pio, sm);
dma_channel_config c = dma_channel_get_default_config(dma_chan);
channel_config_set_read_increment(&c, false);
@ -73,7 +76,7 @@ void logic_analyser_arm(PIO pio, uint sm, uint dma_chan, uint32_t *capture_buf,
channel_config_set_dreq(&c, pio_get_dreq(pio, sm, false));
dma_channel_configure(dma_chan, &c,
capture_buf, // Destinatinon pointer
capture_buf, // Destination pointer
&pio->rxf[sm], // Source pointer
capture_size_words, // Number of transfers
true // Start immediately