mirrors
/
pimoroni-pico
mirror of https://github.com/pimoroni/pimoroni-pico.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

HUB75 Clear TX FIFOs for MicroPython soft reset glitch

This commit is contained in:
Phil Howard 2021-11-23 15:09:03 +00:00
parent d4bf69324f
commit 069ca38ae7
1 changed files with 17 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/hub75/hub75.cpp
View File

@ -131,20 +131,34 @@ void Hub75::start(irq_handler_t handler) {
if(handler) {
dma_channel = 0;
// Try as I might, I can't seem to coax MicroPython into leaving PIO in a known state upon soft reset
// check for claimed PIO and prepare a clean slate.
if(pio_sm_is_claimed(pio, sm_data) || pio_sm_is_claimed(pio, sm_row)) {
irq_set_enabled(pio_get_dreq(pio, sm_data, true), false);
pio_sm_drain_tx_fifo(pio, sm_data);
pio_sm_set_enabled(pio, sm_data, false);
pio_sm_unclaim(pio, sm_data);
pio_sm_drain_tx_fifo(pio, sm_row);
pio_sm_set_enabled(pio, sm_row, false);
pio_sm_unclaim(pio, sm_row);
pio_clear_instruction_memory(pio);
// Make sure the GPIO is in a known good state
// since we don't know what the PIO might have done with it
gpio_put_masked(0b111111 << pin_r0, 0);
gpio_put_masked(0b11111 << pin_row_a, 0);
gpio_put(pin_clk, !clk_polarity);
gpio_put(pin_clk, !oe_polarity);
}
if (panel_type == PANEL_FM6126A) {
FM6126A_setup();
}
// Claim the PIO so we can clean it upon soft restart
pio_sm_claim(pio, sm_data);
pio_sm_claim(pio, sm_row);
@ -204,7 +218,8 @@ void Hub75::stop(irq_handler_t handler) {
pio_sm_set_enabled(pio, sm_data, false);
pio_sm_set_enabled(pio, sm_row, false);
// release the pio and sm
// Release the pio and sm
// This *should* be happening upon soft reset!
if(pio_sm_is_claimed(pio, sm_data)) pio_sm_unclaim(pio, sm_data);
if(pio_sm_is_claimed(pio, sm_data)) pio_sm_unclaim(pio, sm_row);
pio_clear_instruction_memory(pio);
@ -304,6 +319,6 @@ void Hub75::dma_complete() {
}
}
dma_channel_set_trans_count(dma_channel, width * 4, false);
dma_channel_set_trans_count(dma_channel, width * 4, false); // This count is in uint32_t which is 1/2th the size of Pixel
dma_channel_set_read_addr(dma_channel, &back_buffer[row * width * 2], true);
}