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Diffstat (limited to 'src/flash.c.bak')
| -rw-r--r-- | src/flash.c.bak | 115 |
1 files changed, 0 insertions, 115 deletions
diff --git a/src/flash.c.bak b/src/flash.c.bak deleted file mode 100644 index e3de420..0000000 --- a/src/flash.c.bak +++ /dev/null @@ -1,115 +0,0 @@ -/** - * @file flash.c - * Provides functionality for using an external SPI flash - * - * Copyright (C) 2018 Clyne Sullivan - * - * This program is free software: you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation, either version 3 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program. If not, see <https://www.gnu.org/licenses/>. - */ - -#include <stm32l476xx.h> -#include <gpio.h> -#include <clock.h> - -#define READ 0x03 -#define WRITE 0x02 -#define WREN 0x06 -#define WRDS 0x04 - -#define NSS GPIO_PORT(B, 12) -#define SCK GPIO_PORT(B, 13) -#define MISO GPIO_PORT(B, 14) -#define MOSI GPIO_PORT(B, 15) - -void flash_xchg(char *byte, int count); - -void flash_init(void) -{ - gpio_mode(NSS, ALTERNATE); - gpio_mode(SCK, ALTERNATE); - gpio_mode(MISO, ALTERNATE); - gpio_mode(MOSI, ALTERNATE); - GPIOB->AFR[1] |= 0x55550000; // alt mode SPI2 - - // clock enable - RCC->APB1ENR1 |= RCC_APB1ENR1_SPI2EN; - - SPI2->CR1 &= ~(SPI_CR1_BR_Msk); - SPI2->CR1 |= (3 << SPI_CR1_BR_Pos); - SPI2->CR1 |= SPI_CR1_SSM | SPI_CR1_SSI; - SPI2->CR1 |= SPI_CR1_MSTR; - SPI2->CR2 &= ~(SPI_CR2_DS_Msk); - SPI2->CR2 |= (7 << SPI_CR2_DS_Pos); - SPI2->CR2 |= SPI_CR2_SSOE; - SPI2->CR2 |= SPI_CR2_FRXTH; - SPI2->CR1 |= SPI_CR1_SPE; - - char buf[4]; - buf[0] = READ; - buf[1] = 0; - buf[2] = 0; - buf[3] = 0; - flash_xchg(buf, 4); -} - -void flash_xchg(char *byte, int count) -{ - uint32_t status = 0, dummy; - SPI2->CR1 &= ~(SPI_CR1_SSI); - while (SPI2->SR & SPI_SR_BSY); - for (int i = 0; i < count; i++) { - SPI2->DR = byte[i]; - do status = SPI2->SR; - while (status & SPI_SR_BSY); - // discard rx - while (status & SPI_SR_RXNE) { - dummy = SPI2->DR; - status = SPI2->SR; - } - } - do status = SPI2->SR; - while (status & SPI_SR_BSY); - - while (1) { - SPI2->DR = 0; - do status = SPI2->SR; - while (status & SPI_SR_BSY); - // discard rx - while (status & SPI_SR_RXNE) { - dummy = SPI2->DR; - status = SPI2->SR; - } - } - - SPI2->CR1 |= SPI_CR1_SSI; - (void)dummy; -} - -void flash_read(char *buf, uint32_t addr, unsigned int count) -{ - (void)buf; - (void)addr; - (void)count; - if (buf == 0) - return; -} - -void flash_write(const char *buf, uint32_t addr, unsigned int count) -{ - (void)buf; - (void)addr; - (void)count; - if (buf == 0) - return; -} |