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ST7789 Parallel: Work with SYS clock faster than 125MHz

This commit is contained in:
Mike Bell 2022-08-04 20:26:45 +01:00
parent 2855159921
commit b8ba66f593
1 changed files with 7 additions and 1 deletions
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8
drivers/st7789/st7789.hpp
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@ -5,6 +5,7 @@
#include "hardware/gpio.h"
#include "hardware/pio.h"
#include "hardware/pwm.h"
#include "hardware/clocks.h"
#include "common/pimoroni_common.hpp"
#include "common/pimoroni_bus.hpp"
#include "libraries/pico_graphics/pico_graphics.hpp"
@ -82,7 +83,12 @@ namespace pimoroni {
sm_config_set_sideset_pins(&c, wr_sck);
sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
sm_config_set_out_shift(&c, false, true, 8);
sm_config_set_clkdiv(&c, 4);
// Determine clock divider
constexpr uint32_t max_pio_clk = 32 * MHZ;
const uint32_t sys_clk_hz = clock_get_hz(clk_sys);
const uint32_t clk_div = (sys_clk_hz + max_pio_clk - 1) / max_pio_clk;
sm_config_set_clkdiv(&c, clk_div);
pio_sm_init(parallel_pio, parallel_sm, parallel_offset, &c);
pio_sm_set_enabled(parallel_pio, parallel_sm, true);