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switched from i2c protocol to spi #27

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50 changes: 26 additions & 24 deletions ssd1306.c
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Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,7 @@ SOFTWARE.
*/

#include <pico/stdlib.h>
#include <hardware/i2c.h>
#include <hardware/spi.h>
#include <pico/binary_info.h>
#include <stdlib.h>
#include <string.h>
Expand All @@ -36,44 +36,46 @@ SOFTWARE.
inline static void swap(int32_t *a, int32_t *b) {
int32_t *t=a;
*a=*b;
*b=*t;
*b=t;
}

inline static void fancy_write(i2c_inst_t *i2c, uint8_t addr, const uint8_t *src, size_t len, char *name) {
switch(i2c_write_blocking(i2c, addr, src, len, false)) {
case PICO_ERROR_GENERIC:
printf("[%s] addr not acknowledged!\n", name);
break;
case PICO_ERROR_TIMEOUT:
printf("[%s] timeout!\n", name);
break;
default:
//printf("[%s] wrote successfully %lu bytes!\n", name, len);
break;
}
inline static void fancy_write(spi_inst_t *spi, const uint8_t *src, size_t len, char *name) {
uint res = spi_write_blocking(spi, src, len);
//printf("name: %s, return: %d\n", name, res);
}

inline static void ssd1306_write(ssd1306_t *p, uint8_t val) {
uint8_t d[2]= {0x00, val};
fancy_write(p->i2c_i, p->address, d, 2, "ssd1306_write");
gpio_put(p->dc_pin, 0);
fancy_write(p->spi_i, &val, 1, "ssd1306_write");
}

bool ssd1306_init(ssd1306_t *p, uint16_t width, uint16_t height, uint8_t address, i2c_inst_t *i2c_instance) {
bool ssd1306_init(ssd1306_t *p, uint16_t width, uint16_t height, uint dc_pin, uint rst_pin, spi_inst_t *spi_instance) {
p->width=width;
p->height=height;
p->pages=height/8;
p->address=address;
p->dc_pin=dc_pin;
p->rst_pin=rst_pin;

p->spi_i=spi_instance;

p->i2c_i=i2c_instance;
gpio_init(p->dc_pin);
gpio_set_dir(p->dc_pin, GPIO_OUT);

gpio_init(p->rst_pin);
gpio_set_dir(p->rst_pin, GPIO_OUT);
gpio_put(p->rst_pin, 1);
sleep_ms(1);
gpio_put(p->rst_pin, 0);
sleep_ms(10);
gpio_put(p->rst_pin, 1);
sleep_ms(10);

p->bufsize=(p->pages)*(p->width);
if((p->buffer=malloc(p->bufsize+1))==NULL) {
if((p->buffer=malloc(p->bufsize))==NULL) {
p->bufsize=0;
return false;
}

++(p->buffer);

// from https://github.com/makerportal/rpi-pico-ssd1306
uint8_t cmds[]= {
Expand Down Expand Up @@ -116,7 +118,7 @@ bool ssd1306_init(ssd1306_t *p, uint16_t width, uint16_t height, uint8_t address
}

inline void ssd1306_deinit(ssd1306_t *p) {
free(p->buffer-1);
free(p->buffer);
}

inline void ssd1306_poweroff(ssd1306_t *p) {
Expand Down Expand Up @@ -300,7 +302,7 @@ void ssd1306_show(ssd1306_t *p) {
for(size_t i=0; i<sizeof(payload); ++i)
ssd1306_write(p, payload[i]);

*(p->buffer-1)=0x40;
gpio_put(p->dc_pin, 1);

fancy_write(p->i2c_i, p->address, p->buffer-1, p->bufsize+1, "ssd1306_show");
fancy_write(p->spi_i, p->buffer, p->bufsize, "ssd1306_show");
}
16 changes: 9 additions & 7 deletions ssd1306.h
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Original file line number Diff line number Diff line change
Expand Up @@ -31,7 +31,7 @@ SOFTWARE.
#ifndef _inc_ssd1306
#define _inc_ssd1306
#include <pico/stdlib.h>
#include <hardware/i2c.h>
#include <hardware/spi.h>

/**
* @brief defines commands used in ssd1306
Expand Down Expand Up @@ -63,8 +63,9 @@ typedef struct {
uint8_t width; /**< width of display */
uint8_t height; /**< height of display */
uint8_t pages; /**< stores pages of display (calculated on initialization*/
uint8_t address; /**< i2c address of display*/
i2c_inst_t *i2c_i; /**< i2c connection instance */
uint dc_pin; /**< spi dc pin number*/
uint rst_pin; /**< spi rst pin number */
spi_inst_t *spi_i; /**< spi connection instance */
bool external_vcc; /**< whether display uses external vcc */
uint8_t *buffer; /**< display buffer */
size_t bufsize; /**< buffer size */
Expand All @@ -75,15 +76,16 @@ typedef struct {
*
* @param[in] p : pointer to instance of ssd1306_t
* @param[in] width : width of display
* @param[in] height : heigth of display
* @param[in] address : i2c address of display
* @param[in] i2c_instance : instance of i2c connection
* @param[in] height : height of display
* @param[in] dc_pin : SPI data/command pin number
* @param[in] rst_pin : SPI reset pin number
* @param[in] spi_instance : instance of spi connection
*
* @return bool.
* @retval true for Success
* @retval false if initialization failed
*/
bool ssd1306_init(ssd1306_t *p, uint16_t width, uint16_t height, uint8_t address, i2c_inst_t *i2c_instance);
bool ssd1306_init(ssd1306_t *p, uint16_t width, uint16_t height, uint dc_pin, uint rst_pin, spi_inst_t *spi_instance);

/**
* @brief deinitialize display
Expand Down