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Merge pull request #2291 from hierophect/stm32-neopixel

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STM32: Neopixel support
This commit is contained in:
Dan Halbert 2019-11-18 23:45:09 -05:00 committed by GitHub
commit 1a22d8a0f2
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GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 143 additions and 8 deletions
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10
ports/stm32f4/boards/feather_stm32f405_express/mpconfigboard.h
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@ -35,11 +35,13 @@
#define AUTORESET_DELAY_MS 500
#define BOARD_FLASH_SIZE (FLASH_SIZE - 0x4000)
#define MICROPY_HW_NEOPIXEL (&pin_PC00)
// On-board flash
#define SPI_FLASH_MOSI_PIN &pin_PB05
#define SPI_FLASH_MISO_PIN &pin_PB04
#define SPI_FLASH_SCK_PIN &pin_PB03
#define SPI_FLASH_CS_PIN &pin_PA15
#define SPI_FLASH_MOSI_PIN (&pin_PB05)
#define SPI_FLASH_MISO_PIN (&pin_PB04)
#define SPI_FLASH_SCK_PIN (&pin_PB03)
#define SPI_FLASH_CS_PIN (&pin_PA15)
#define DEFAULT_I2C_BUS_SCL (&pin_PB06)
#define DEFAULT_I2C_BUS_SDA (&pin_PB07)

1
ports/stm32f4/boards/feather_stm32f405_express/pins.c
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@ -26,6 +26,7 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR_TX), MP_ROM_PTR(&pin_PB10) },
{ MP_ROM_QSTR(MP_QSTR_RX), MP_ROM_PTR(&pin_PB11) },
{ MP_ROM_QSTR(MP_QSTR_NEOPIXEL), MP_ROM_PTR(&pin_PC00) },
{ MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
{ MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
{ MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },

35
ports/stm32f4/common-hal/microcontroller/Pin.c
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@ -26,11 +26,17 @@
*/
#include "shared-bindings/microcontroller/Pin.h"
#include "shared-bindings/digitalio/DigitalInOut.h"
#include "supervisor/shared/rgb_led_status.h"
#include "py/mphal.h"
#include "stm32f4/pins.h"
#include "stm32f4xx_hal.h"
#ifdef MICROPY_HW_NEOPIXEL
bool neopixel_in_use;
#endif
#if MCU_PACKAGE == 144
#define GPIO_PORT_COUNT 7
GPIO_TypeDef * ports[GPIO_PORT_COUNT] = {GPIOA, GPIOB, GPIOC, GPIOD, GPIOE, GPIOF, GPIOG};
@ -53,6 +59,10 @@ void reset_all_pins(void) {
for (uint8_t i = 0; i < GPIO_PORT_COUNT; i++) {
HAL_GPIO_DeInit(ports[i], ~never_reset_pins[i]);
}
#ifdef MICROPY_HW_NEOPIXEL
neopixel_in_use = false;
#endif
}
// Mark pin as free and return it to a quiescent state.
@ -60,13 +70,18 @@ void reset_pin_number(uint8_t pin_port, uint8_t pin_number) {
if (pin_port == 0x0F) {
return;
}
// Clear claimed bit.
// Clear claimed bit & reset
claimed_pins[pin_port] &= ~(1<<pin_number);
// Reset the pin
HAL_GPIO_DeInit(ports[pin_port], 1<<pin_number);
}
#ifdef MICROPY_HW_NEOPIXEL
if (pin_port == MICROPY_HW_NEOPIXEL->port && pin_number == MICROPY_HW_NEOPIXEL->number) {
neopixel_in_use = false;
rgb_led_status_init();
return;
}
#endif
}
void never_reset_pin_number(uint8_t pin_port, uint8_t pin_number) {
never_reset_pins[pin_port] |= 1<<pin_number;
@ -83,6 +98,12 @@ void common_hal_reset_pin(const mcu_pin_obj_t* pin) {
void claim_pin(const mcu_pin_obj_t* pin) {
// Set bit in claimed_pins bitmask.
claimed_pins[pin->port] |= 1<<pin->number;
#ifdef MICROPY_HW_NEOPIXEL
if (pin == MICROPY_HW_NEOPIXEL) {
neopixel_in_use = true;
}
#endif
}
bool pin_number_is_free(uint8_t pin_port, uint8_t pin_number) {
@ -90,6 +111,12 @@ bool pin_number_is_free(uint8_t pin_port, uint8_t pin_number) {
}
bool common_hal_mcu_pin_is_free(const mcu_pin_obj_t *pin) {
#ifdef MICROPY_HW_NEOPIXEL
if (pin == MICROPY_HW_NEOPIXEL) {
return !neopixel_in_use;
}
#endif
return pin_number_is_free(pin->port, pin->number);
}

8
ports/stm32f4/common-hal/microcontroller/Pin.h
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@ -31,6 +31,14 @@
#include "peripherals/stm32f4/pins.h"
#ifdef MICROPY_HW_NEOPIXEL
extern bool neopixel_in_use;
#endif
#ifdef MICROPY_HW_APA102_MOSI
extern bool apa102_sck_in_use;
extern bool apa102_mosi_in_use;
#endif
void reset_all_pins(void);
// reset_pin_number takes the pin number instead of the pointer so that objects don't
// need to store a full pointer.

96
ports/stm32f4/common-hal/neopixel_write/__init__.c Normal file
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@ -0,0 +1,96 @@
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2019 Lucian Copeland for Adafruit Industries
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "py/mphal.h"
#include "shared-bindings/neopixel_write/__init__.h"
#include "tick.h"
#include "common-hal/microcontroller/Pin.h"
#include "stm32f4xx_hal.h"
#include "stm32f4xx_ll_gpio.h"
uint64_t next_start_tick_ms = 0;
uint32_t next_start_tick_us = 1000;
//sysclock divisors
#define MAGIC_800_INT 900000 // ~1.11 us -> 1.2 field
#define MAGIC_800_T0H 2800000 // ~0.36 us -> 0.44 field
#define MAGIC_800_T1H 1350000 // ~0.74 us -> 0.84 field
void common_hal_neopixel_write (const digitalio_digitalinout_obj_t* digitalinout, uint8_t *pixels,
uint32_t numBytes) {
uint8_t *p = pixels, *end = p + numBytes, pix = *p++, mask = 0x80;
uint32_t start = 0;
uint32_t cyc = 0;
//assumes 800_000Hz frequency
//Theoretical values here are 800_000 -> 1.25us, 2500000->0.4us, 1250000->0.8us
//But they don't work, possibly due to bad optimization? Use tested magic values instead
uint32_t sys_freq = HAL_RCC_GetSysClockFreq();
uint32_t interval = sys_freq/MAGIC_800_INT;
uint32_t t0 = (sys_freq/MAGIC_800_T0H);
uint32_t t1 = (sys_freq/MAGIC_800_T1H);
// This must be called while interrupts are on in case we're waiting for a
// future ms tick.
wait_until(next_start_tick_ms, next_start_tick_us);
GPIO_TypeDef * p_port = pin_port(digitalinout->pin->port);
uint32_t p_mask = pin_mask(digitalinout->pin->number);
__disable_irq();
// Enable DWT in debug core. Useable when interrupts disabled, as opposed to Systick->VAL
//ITM->LAR = 0xC5ACCE55; //this should be required but isn't
CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk;
DWT->CTRL |= DWT_CTRL_CYCCNTENA_Msk;
DWT->CYCCNT = 0;
for(;;) {
start = DWT->CYCCNT;
LL_GPIO_SetOutputPin(p_port, p_mask);
cyc = (pix & mask) ? t1 : t0;
while(DWT->CYCCNT - start < cyc);
LL_GPIO_ResetOutputPin(p_port, p_mask);
if(!(mask >>= 1)) {
if(p >= end) break;
pix = *p++;
mask = 0x80;
}
while(DWT->CYCCNT - start < interval); //wait for interval to finish
}
// Enable interrupts again
__enable_irq();
// Update the next start.
current_tick(&next_start_tick_ms, &next_start_tick_us);
if (next_start_tick_us < 100) {
next_start_tick_ms += 1;
next_start_tick_us = 100 - next_start_tick_us;
} else {
next_start_tick_us -= 100;
}
}

1
ports/stm32f4/mpconfigport.mk
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@ -26,6 +26,7 @@ CIRCUITPY_STORAGE = 1
CIRCUITPY_RANDOM = 1
CIRCUITPY_USB_HID = 1
CIRCUITPY_USB_MIDI = 1
CIRCUITPY_NEOPIXEL_WRITE = 1
#ifeq ($(MCU_SUB_VARIANT), stm32f412zx)
#endif