115 lines
3.5 KiB
C
115 lines
3.5 KiB
C
// Copyright 2021 IOsetting <iosetting(at)outlook.com>
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
/**
|
|
* Demo: MAX7219 8x8 LED Matrix
|
|
* Board: STC8H1K08
|
|
*
|
|
* P1.3 -> DIN
|
|
* P1.5 -> SCLK
|
|
* P1.7 -> CS
|
|
*/
|
|
|
|
#include "fw_hal.h"
|
|
|
|
#define MAX7219_CS P17
|
|
|
|
#define DECODE_MODE 0x09
|
|
#define INTENSITY 0x0A
|
|
#define SCAN_LIMIT 0x0B
|
|
#define SHUT_DOWN 0x0C
|
|
#define DISPLAY_TEST 0x0F
|
|
|
|
const uint8_t numbers[]={
|
|
0x00,0x00,0x7C,0xC6,0xC6,0xCE,0xD6,0xD6, // -0-.
|
|
0xE6,0xC6,0xC6,0x7C,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x18,0x38,0x78,0x18,0x18,0x18, // -1-
|
|
0x18,0x18,0x18,0x7E,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x7C,0xC6,0x06,0x0C,0x18,0x30, // -2-
|
|
0x60,0xC0,0xC6,0xFE,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x7C,0xC6,0x06,0x06,0x3C,0x06, // -3-
|
|
0x06,0x06,0xC6,0x7C,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x0C,0x1C,0x3C,0x6C,0xCC,0xFE, // -4-
|
|
0x0C,0x0C,0x0C,0x1E,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0xFE,0xC0,0xC0,0xC0,0xFC,0x0E, // -5-
|
|
0x06,0x06,0xC6,0x7C,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x38,0x60,0xC0,0xC0,0xFC,0xC6, // -6-
|
|
0xC6,0xC6,0xC6,0x7C,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0xFE,0xC6,0x06,0x06,0x0C,0x18, // -7-
|
|
0x30,0x30,0x30,0x30,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x7C,0xC6,0xC6,0xC6,0x7C,0xC6, // -8-
|
|
0xC6,0xC6,0xC6,0x7C,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x7C,0xC6,0xC6,0xC6,0x7E,0x06, // -9-
|
|
0x06,0x06,0x0C,0x78,0x00,0x00,0x00,0x00};
|
|
|
|
void MAX7219_write(uint8_t addr, uint8_t dat)
|
|
{
|
|
MAX7219_CS = 0;
|
|
SPI_TxRx(addr);
|
|
SPI_TxRx(dat);
|
|
MAX7219_CS = 1;
|
|
}
|
|
|
|
void MAX7219_init(void)
|
|
{
|
|
MAX7219_write(SHUT_DOWN, 0x01); // 0x00:shutdown, 0x01:normal
|
|
MAX7219_write(DECODE_MODE, 0x00); // Bypass code B decoder, no-decode operation
|
|
MAX7219_write(SCAN_LIMIT, 0x07); // Scan-limit, 0:1-digit, 1:2-digits, ... 7:8-digits
|
|
MAX7219_write(INTENSITY, 0x01); // 0x00:min, 0xFF:max
|
|
MAX7219_write(DISPLAY_TEST, 0x00); // 0x00:normal, 0x01:test mode
|
|
}
|
|
|
|
void SPI_init(void)
|
|
{
|
|
// MAX7219 can work with frequency up to 20MHz
|
|
SPI_SetClockPrescaler(SPI_ClockPreScaler_4);
|
|
// Clock idles low
|
|
SPI_SetClockPolarity(HAL_State_OFF);
|
|
// Data transfer is driven by lower SS pin
|
|
SPI_SetClockPhase(SPI_ClockPhase_LeadingEdge);
|
|
// MSB first
|
|
SPI_SetDataOrder(SPI_DataOrder_MSB);
|
|
// Define the output pins
|
|
SPI_SetPort(SPI_AlterPort_P12P54_P13_P14_P15);
|
|
// Ignore SS pin, use MSTR to swith between master/slave mode
|
|
SPI_IgnoreSlaveSelect(HAL_State_ON);
|
|
// Master mode
|
|
SPI_SetMasterMode(HAL_State_ON);
|
|
// Start SPI
|
|
SPI_SetEnabled(HAL_State_ON);
|
|
}
|
|
|
|
void main()
|
|
{
|
|
uint8_t pos = 0, size = sizeof(numbers), i, j;
|
|
|
|
SYS_SetClock();
|
|
// Configure GPIO pins before SPI and device
|
|
GPIO_P1_SetMode(GPIO_Pin_3, GPIO_Mode_InOut_QBD);
|
|
GPIO_P1_SetMode(GPIO_Pin_5|GPIO_Pin_7, GPIO_Mode_Output_PP);
|
|
// Configure SPI and device
|
|
SPI_init();
|
|
MAX7219_init();
|
|
|
|
while(1)
|
|
{
|
|
for (i = 0; i < 8; i++)
|
|
{
|
|
j = (pos + i) % size;
|
|
MAX7219_write(i + 1, numbers[j]);
|
|
}
|
|
pos = (pos + 1) % size;
|
|
SYS_Delay(100);
|
|
}
|
|
} |