diff options
author | Xelus22 <17491233+Xelus22@users.noreply.github.com> | 2021-03-19 08:29:18 +0000 |
---|---|---|
committer | GitHub <noreply@github.com> | 2021-03-19 19:29:18 +1100 |
commit | 6f7466b6dd72e161b61683e26b7720421d8cc9bd (patch) | |
tree | 7cbe7eb4a049fc57eb3c3e71e6c8f5397d49e2fc /drivers/chibios | |
parent | f2715a05939b749771d9826f9ad23b4cab280e82 (diff) |
ARM WS2812 SPI config (baudrate and circular buffer) (#12216)
* initial commit
* include circular buffer command
* add endif
* circular buffer mode
* remove untrue comment
* revamp and add documentation
* do not allow WS2812_SPI_SYNC & CIRCULAR_BUFFER
Diffstat (limited to 'drivers/chibios')
-rw-r--r-- | drivers/chibios/ws2812_spi.c | 44 |
1 files changed, 40 insertions, 4 deletions
diff --git a/drivers/chibios/ws2812_spi.c b/drivers/chibios/ws2812_spi.c index 89df2987b5..bc0a54acce 100644 --- a/drivers/chibios/ws2812_spi.c +++ b/drivers/chibios/ws2812_spi.c @@ -32,6 +32,37 @@ # endif #endif +// Define SPI config speed +// baudrate should target 3.2MHz +// F072 fpclk = 48MHz +// 48/16 = 3Mhz +#if WS2812_SPI_DIVISOR == 2 +# define WS2812_SPI_DIVISOR (0) +#elif WS2812_SPI_DIVISOR == 4 +# define WS2812_SPI_DIVISOR (SPI_CR1_BR_0) +#elif WS2812_SPI_DIVISOR == 8 +# define WS2812_SPI_DIVISOR (SPI_CR1_BR_1) +#elif WS2812_SPI_DIVISOR == 16 //same as default +# define WS2812_SPI_DIVISOR (SPI_CR1_BR_1 | SPI_CR1_BR_0) +#elif WS2812_SPI_DIVISOR == 32 +# define WS2812_SPI_DIVISOR (SPI_CR1_BR_2) +#elif WS2812_SPI_DIVISOR == 64 +# define WS2812_SPI_DIVISOR (SPI_CR1_BR_2 | SPI_CR1_BR_0) +#elif WS2812_SPI_DIVISOR == 128 +# define WS2812_SPI_DIVISOR (SPI_CR1_BR_2 | SPI_CR1_BR_1) +#elif WS2812_SPI_DIVISOR == 256 +# define WS2812_SPI_DIVISOR (SPI_CR1_BR_2 | SPI_CR1_BR_1 | SPI_CR1_BR_0) +#else +# define WS2812_SPI_DIVISOR (SPI_CR1_BR_1 | SPI_CR1_BR_0) //default +#endif + +// Use SPI circular buffer +#ifdef WS2812_SPI_USE_CIRCULAR_BUFFER +# define WS2812_SPI_BUFFER_MODE 1 //circular buffer +#else +# define WS2812_SPI_BUFFER_MODE 0 //normal buffer +#endif + #define BYTES_FOR_LED_BYTE 4 #define NB_COLORS 3 #define BYTES_FOR_LED (BYTES_FOR_LED_BYTE * NB_COLORS) @@ -82,13 +113,16 @@ void ws2812_init(void) { // TODO: more dynamic baudrate static const SPIConfig spicfg = { - 0, NULL, PAL_PORT(RGB_DI_PIN), PAL_PAD(RGB_DI_PIN), - SPI_CR1_BR_1 | SPI_CR1_BR_0 // baudrate : fpclk / 8 => 1tick is 0.32us (2.25 MHz) + WS2812_SPI_BUFFER_MODE, NULL, PAL_PORT(RGB_DI_PIN), PAL_PAD(RGB_DI_PIN), + WS2812_SPI_DIVISOR }; spiAcquireBus(&WS2812_SPI); /* Acquire ownership of the bus. */ spiStart(&WS2812_SPI, &spicfg); /* Setup transfer parameters. */ spiSelect(&WS2812_SPI); /* Slave Select assertion. */ +#ifdef WS2812_SPI_USE_CIRCULAR_BUFFER + spiStartSend(&WS2812_SPI, sizeof(txbuf) / sizeof(txbuf[0]), txbuf); +#endif } void ws2812_setleds(LED_TYPE* ledarray, uint16_t leds) { @@ -104,9 +138,11 @@ void ws2812_setleds(LED_TYPE* ledarray, uint16_t leds) { // Send async - each led takes ~0.03ms, 50 leds ~1.5ms, animations flushing faster than send will cause issues. // Instead spiSend can be used to send synchronously (or the thread logic can be added back). -#ifdef WS2812_SPI_SYNC +#ifndef WS2812_SPI_USE_CIRCULAR_BUFFER +# ifdef WS2812_SPI_SYNC spiSend(&WS2812_SPI, sizeof(txbuf) / sizeof(txbuf[0]), txbuf); -#else +# else spiStartSend(&WS2812_SPI, sizeof(txbuf) / sizeof(txbuf[0]), txbuf); +# endif #endif } |