demo of driving MAX2719 dot matrix displays with STM32F103 Bluepill
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f103-dotmatrix/project/dotmatrix.c

115 lines
2.7 KiB

#include "dotmatrix.h"
#include "malloc_safe.h"
#include "com/debug.h"
DotMatrix_Cfg *dmtx;
DotMatrix_Cfg* dmtx_init(DotMatrix_Init *init)
{
DotMatrix_Cfg *disp = calloc_s(1, sizeof(DotMatrix_Cfg));
disp->drv.SPIx = init->SPIx;
disp->drv.CS_GPIOx = init->CS_GPIOx;
disp->drv.CS_PINx = init->CS_PINx;
disp->drv.chain_len = init->cols * init->rows;
disp->cols = init->cols;
disp->rows = init->rows;
disp->screen = calloc_s(init->cols * init->rows * 8, 1); // 8 bytes per driver
max2719_cmd_all(&disp->drv, MAX2719_CMD_DECODE_MODE, 0x00); // no decode
max2719_cmd_all(&disp->drv, MAX2719_CMD_SCAN_LIMIT, 0x07); // scan all 8
max2719_cmd_all(&disp->drv, MAX2719_CMD_SHUTDOWN, 0x01); // not shutdown
max2719_cmd_all(&disp->drv, MAX2719_CMD_DISPLAY_TEST, 0x00); // not test
max2719_cmd_all(&disp->drv, MAX2719_CMD_INTENSITY, 0x07); // half intensity
// clear
for (uint8_t i = 0; i < 8; i++) {
max2719_cmd_all(&disp->drv, MAX2719_CMD_DIGIT0+i, 0);
}
return disp;
}
void dmtx_show(DotMatrix_Cfg* disp)
{
for (uint8_t i = 0; i < 8; i++) {
// show each digit's array in turn
max2719_cmd_all_data(&disp->drv, MAX2719_CMD_DIGIT0+i, disp->screen + (i * disp->drv.chain_len));
}
}
void dmtx_clear(DotMatrix_Cfg* disp)
{
memset(disp->screen, 0, disp->drv.chain_len*8);
}
void dmtx_intensity(DotMatrix_Cfg* disp, uint8_t intensity)
{
max2719_cmd_all(&disp->drv, MAX2719_CMD_INTENSITY, intensity & 0x0F);
}
void dmtx_blank(DotMatrix_Cfg* disp, bool blank)
{
max2719_cmd_all(&disp->drv, MAX2719_CMD_SHUTDOWN, blank & 0x01);
}
/**
* @brief Get a cell pointer
* @param disp : driver inst
* @param x : x coord
* @param y : y coord
* @param xd : pointer to store the offset in the cell
* @return cell ptr
*/
static uint8_t* cell_ptr(DotMatrix_Cfg* disp, int32_t x, int32_t y, uint8_t *xd)
{
if (x < 0 || y < 0) return NULL;
if ((uint32_t)x >= disp->cols*8 || (uint32_t)y >= disp->rows*8) return NULL;
uint32_t cell_x = (uint32_t)x >> 3;
*xd = x & 7;
// resolve cell
uint32_t digit = y & 7;
cell_x += ((uint32_t)y >> 3) * disp->cols;
uint32_t cell_idx = (digit * disp->drv.chain_len) + cell_x;
return &disp->screen[cell_idx];
}
bool dmtx_get(DotMatrix_Cfg* disp, int32_t x, int32_t y)
{
uint8_t xd;
uint8_t *cell = cell_ptr(disp, x, y, &xd);
if (cell == NULL) return 0;
return (bool)(*cell & (1 << xd));
}
void dmtx_toggle(DotMatrix_Cfg* disp, int32_t x, int32_t y)
{
uint8_t xd;
uint8_t *cell = cell_ptr(disp, x, y, &xd);
if (cell == NULL) return;
*cell ^= 1 << xd;
}
void dmtx_set(DotMatrix_Cfg* disp, int32_t x, int32_t y, bool bit)
{
uint8_t xd;
uint8_t *cell = cell_ptr(disp, x, y, &xd);
if (cell == NULL) return;
if (bit) {
*cell |= bit << xd;
} else {
*cell &= ~(bit << xd);
}
}