75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
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#include <stdio.h>
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#include <pico/stdlib.h>
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#include <pico/binary_info.h>
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#include <hardware/spi.h>
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#include "pinout.h"
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#include "protos.h"
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#include "serprog.h"
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static bool cs_asserted;
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void sp_spi_init(void) {
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//printf("spi init!\n");
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cs_asserted = false;
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spi_init(PINOUT_SPI_DEV, 512*1000); // default to 512 kHz
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gpio_set_function(PINOUT_SPI_MISO, GPIO_FUNC_SPI);
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gpio_set_function(PINOUT_SPI_MOSI, GPIO_FUNC_SPI);
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gpio_set_function(PINOUT_SPI_SCLK, GPIO_FUNC_SPI);
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//gpio_set_function(PINOUT_SPI_nCS, GPIO_FUNC_SIO);
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gpio_init(PINOUT_SPI_nCS);
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gpio_put(PINOUT_SPI_nCS, 1);
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gpio_set_dir(PINOUT_SPI_nCS, GPIO_OUT);
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bi_decl(bi_3pins_with_func(PINOUT_SPI_MISO, PINOUT_SPI_MOSI, PINOUT_SPI_SCLK, GPIO_FUNC_SPI));
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bi_decl(bi_1pin_with_name(PINOUT_SPI_nCS, "SPI #CS"));
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}
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uint32_t __not_in_flash_func(sp_spi_set_freq)(uint32_t freq_wanted) {
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return spi_set_baudrate(PINOUT_SPI_DEV, freq_wanted);
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}
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void __not_in_flash_func(sp_spi_cs_deselect)(void) {
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asm volatile("nop\nnop\nnop"); // idk if this is needed
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gpio_put(PINOUT_SPI_nCS, 1);
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asm volatile("nop\nnop\nnop"); // idk if this is needed
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cs_asserted = false;
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}
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void __not_in_flash_func(sp_spi_cs_select)(void) {
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asm volatile("nop\nnop\nnop"); // idk if this is needed
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gpio_put(PINOUT_SPI_nCS, 0);
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asm volatile("nop\nnop\nnop"); // idk if this is needed
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cs_asserted = true;
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}
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void __not_in_flash_func(sp_spi_op_begin)(void) {
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//sp_spi_cs_select();
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if (!cs_asserted) {
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asm volatile("nop\nnop\nnop"); // idk if this is needed
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gpio_put(PINOUT_SPI_nCS, 0);
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asm volatile("nop\nnop\nnop"); // idk if this is needed
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}
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}
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void __not_in_flash_func(sp_spi_op_end)(void) {
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//sp_spi_cs_deselect();
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if (!cs_asserted) { // YES, this condition is the intended one!
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asm volatile("nop\nnop\nnop"); // idk if this is needed
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gpio_put(PINOUT_SPI_nCS, 1);
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asm volatile("nop\nnop\nnop"); // idk if this is needed
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}
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}
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// TODO: use dma?
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void __not_in_flash_func(sp_spi_op_write)(uint32_t write_len, const uint8_t* write_data) {
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spi_write_blocking(PINOUT_SPI_DEV, write_data, write_len);
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}
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void __not_in_flash_func(sp_spi_op_read)(uint32_t read_len, uint8_t* read_data) {
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spi_read_blocking(PINOUT_SPI_DEV, 0, read_data, read_len);
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}
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