d95af918fa
lots of code copied over, things filled in to hopefully get the LED matrix lighting up. untested.
68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
/*
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* spi_master.c
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*
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* manage chip select externally.
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*
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* current version is BLOCKING. update later to use interrupt or DMA.
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*/
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#include "spi_master.h"
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void spim_init()
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{
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SPI_InitTypeDef spi = {0};
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spi.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
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spi.SPI_Mode = SPI_Mode_Master;
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spi.SPI_DataSize = SPI_DataSize_8b;
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spi.SPI_CPOL = SPI_CPOL_High;
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spi.SPI_CPHA = SPI_CPHA_2Edge;
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spi.SPI_NSS = SPI_NSS_Soft;
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spi.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
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spi.SPI_FirstBit = SPI_FirstBit_MSB;
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SPI_Init(SPI1, &spi);
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SPI_Cmd(SPI1, ENABLE);
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}
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void spim_write_raw(const uint8_t *data, uint16_t len)
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{
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// todo: make non-blocking, timeout and error checking
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while (len) {
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if (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE)) {
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SPI_I2S_SendData(SPI1, *data);
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data++;
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len--;
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}
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}
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}
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void spim_write_reg8(uint8_t reg, const uint8_t *data, uint16_t len)
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{
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spim_write_raw(®, 1);
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spim_write_raw(data, len);
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}
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void spim_read_raw(uint8_t *data, uint16_t len)
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{
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// todo: non-blocking, timeout and error checking
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while (len) {
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while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY)) {};
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if (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE)) {
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*data++ = SPI_I2S_ReceiveData(SPI1);
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len--;
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}
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SPI_I2S_SendData(SPI1, 0);
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}
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}
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void spim_read_reg8(uint8_t reg, uint8_t *data, uint16_t len)
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{
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spim_write_raw(®, 1);
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spim_read_raw(data, len);
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}
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