Add an example of using using DMA with PIO #468
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peterharperuk
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lurch
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lurch
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peterharperuk
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Jan 29, 2024
pio/uart_pio_dma/uart_pio_dma.c
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| // Allocates a pio and statemachine and loads the pio program into memory | ||
| // Return true on success | ||
| static bool pio_init(const pio_program_t *program, PIO *pio_hw, uint *sm, uint *offset) { |
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See discussion on naming
peterharperuk
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Jan 29, 2024
pio/uart_pio_dma/uart_pio_dma.c
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| } | ||
| } | ||
| // Find a state machine | ||
| *sm = (int8_t)pio_claim_unused_sm(*pio_hw, false); |
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It might be possible to add a program but there are no sm's free?
peterharperuk
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Jan 29, 2024
| // write to the pio fifo | ||
| int count_pio_tx = 0; | ||
| while(count_pio_tx < sizeof(buffer_tx) - 1) { | ||
| uart_tx_program_putc(pio_hw_tx, pio_sm_tx, buffer_tx[count_pio_tx++]); |
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This and the following uart_puts will overflow the fifo if dma is not enabled, need to read and write one character at a time?
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Fixes #467