1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
|
#include <stm32f0xx.h>
#include <stdint.h>
#include <system_stm32f0xx.h>
#include <stm32f0xx_ll_utils.h>
/*
* Part number: STM32F030F4C6
*/
#define NBITS 12
void do_transpose(void);
uint32_t brightness[8];
volatile uint8_t brightness_by_bit[NBITS];
int main(void) {
RCC->CR |= RCC_CR_HSEON;
while (!(RCC->CR&RCC_CR_HSERDY));
RCC->CFGR &= ~RCC_CFGR_PLLMUL_Msk & ~RCC_CFGR_SW_Msk;
RCC->CFGR |= (2<<RCC_CFGR_PLLMUL_Pos) | RCC_CFGR_PLLSRC; /* PLL x4 */
RCC->CR |= RCC_CR_PLLON;
while (!(RCC->CR&RCC_CR_PLLRDY));
RCC->CFGR |= (2<<RCC_CFGR_SW_Pos);
SystemCoreClockUpdate();
LL_Init1msTick(SystemCoreClock);
RCC->AHBENR |= RCC_AHBENR_GPIOAEN | RCC_AHBENR_GPIOBEN;
RCC->APB2ENR |= RCC_APB2ENR_SPI1EN | RCC_APB2ENR_TIM1EN | RCC_APB2ENR_USART1EN | RCC_APB2ENR_ADCEN;
GPIOA->MODER |=
(3<<GPIO_MODER_MODER0_Pos) /* PA0 - Current measurement analog input */
| (1<<GPIO_MODER_MODER1_Pos) /* PA1 - RS485 TX enable */
| (2<<GPIO_MODER_MODER2_Pos) /* PA2 - RS485 TX */
| (2<<GPIO_MODER_MODER3_Pos) /* PA3 - RS485 RX */
| (1<<GPIO_MODER_MODER4_Pos) /* PA4 - LED1 open-drain output */
| (2<<GPIO_MODER_MODER5_Pos) /* PA5 - Shift register clk/SCLK */
| (1<<GPIO_MODER_MODER6_Pos) /* PA6 - LED2 open-drain output */
| (2<<GPIO_MODER_MODER7_Pos) /* PA7 - Shift register data/MOSI */
| (2<<GPIO_MODER_MODER9_Pos) /* PA9 - Shift register clear (TIM1_CH2) */
| (2<<GPIO_MODER_MODER10_Pos);/* PA10 - Shift register strobe (TIM1_CH3) */
GPIOB->MODER |=
(1<<GPIO_MODER_MODER1_Pos); /* PB1 - Current measurement range selection */
GPIOA->OTYPER |= GPIO_OTYPER_OT_6 | GPIO_OTYPER_OT_4; /* LED outputs -> open drain */
/* Set shift register IO GPIO output speed */
GPIOA->OSPEEDR |=
(3<<GPIO_OSPEEDR_OSPEEDR4_Pos) /* LED1 */
| (3<<GPIO_OSPEEDR_OSPEEDR5_Pos) /* SCLK */
| (3<<GPIO_OSPEEDR_OSPEEDR6_Pos) /* LED2 */
| (3<<GPIO_OSPEEDR_OSPEEDR7_Pos) /* MOSI */
| (3<<GPIO_OSPEEDR_OSPEEDR9_Pos) /* Clear */
| (3<<GPIO_OSPEEDR_OSPEEDR10_Pos);/* Strobe */
GPIOA->AFR[0] |=
(1<<GPIO_AFRL_AFRL2_Pos) /* USART1_TX */
| (1<<GPIO_AFRL_AFRL3_Pos) /* USART1_RX */
| (0<<GPIO_AFRL_AFRL5_Pos) /* SPI1_SCK */
| (0<<GPIO_AFRL_AFRL7_Pos); /* SPI1_MOSI */
GPIOA->AFR[1] |=
(2<<GPIO_AFRH_AFRH1_Pos) /* TIM1_CH2 */
| (2<<GPIO_AFRH_AFRH2_Pos); /* TIM1_CH3 */
GPIOB->BSRR = GPIO_BSRR_BR_1; /* clear output is active low */
/* Configure SPI controller */
/* CPOL=0, CPHA=0, prescaler=8 -> 1MBd */
// SPI1->CR1 = SPI_CR1_BIDIMODE | SPI_CR1_BIDIOE | SPI_CR1_SSM | SPI_CR1_SSI | SPI_CR1_SPE | (2<<SPI_CR1_BR_Pos) | SPI_CR1_MSTR;
SPI1->CR1 = SPI_CR1_BIDIMODE | SPI_CR1_BIDIOE | SPI_CR1_SSM | SPI_CR1_SSI | SPI_CR1_SPE | (0<<SPI_CR1_BR_Pos) | SPI_CR1_MSTR;
SPI1->CR2 = (7<<SPI_CR2_DS_Pos);
/* Configure TIM1 for display strobe generation */
/* Configure UART for RS485 comm */
/* 8N1, 115200Bd */
// TIM1->CR1 = TIM_CR1_OPM | TIM_CR1_URS;
// TIM1->CR1 = TIM_CR1_ARPE | TIM_CR1_URS;
TIM1->CR1 = TIM_CR1_ARPE | TIM_CR1_OPM; // | TIM_CR1_URS;
TIM1->CR2 = 0; //TIM_CR2_CCPC;
TIM1->SMCR = 0;
TIM1->DIER = 0;
TIM1->PSC = 1; // debug
/* CH2 - clear/!MR, CH3 - strobe/STCP */
TIM1->CCR2 = 1;
TIM1->RCR = 0;
TIM1->CCMR1 = (6<<TIM_CCMR1_OC2M_Pos); // | TIM_CCMR1_OC2PE;
TIM1->CCMR2 = (6<<TIM_CCMR2_OC3M_Pos); // | TIM_CCMR2_OC3PE;
TIM1->CCER |= TIM_CCER_CC2E | TIM_CCER_CC2NE | TIM_CCER_CC2P | TIM_CCER_CC3E;
// TIM1->CCMR1 = (6<<TIM_CCMR1_OC2M_Pos) | TIM_CCMR1_OC2PE;
// TIM1->CCMR2 = (6<<TIM_CCMR2_OC3M_Pos) | TIM_CCMR2_OC3PE;
// TIM1->CCER = TIM_CCER_CC2E | TIM_CCER_CC3E;
// TIM1->BDTR = TIM_BDTR_MOE;
TIM1->DIER = TIM_DIER_UIE;
NVIC_EnableIRQ(TIM1_BRK_UP_TRG_COM_IRQn);
NVIC_SetPriority(TIM1_BRK_UP_TRG_COM_IRQn, 2);
TIM1->EGR |= TIM_EGR_UG;
while (42) {
/*
for (uint8_t i=0; i<8; i++) {
brightness[1] = brightness[5] = i;
brightness[2] = brightness[6] = 0;
brightness[3] = brightness[7] = 0;
do_transpose();
LL_mDelay(500);
}
for (uint8_t i=0; i<8; i++) {
brightness[1] = brightness[5] = 0;
brightness[2] = brightness[6] = i;
brightness[3] = brightness[7] = 0;
do_transpose();
LL_mDelay(500);
}
for (uint8_t i=0; i<8; i++) {
brightness[1] = brightness[5] = 0;
brightness[2] = brightness[6] = 0;
brightness[3] = brightness[7] = i;
do_transpose();
LL_mDelay(500);
}
for (uint8_t i=0; i<8; i++) {
brightness[1] = brightness[5] = i;
brightness[2] = brightness[6] = i;
brightness[3] = brightness[7] = i;
do_transpose();
LL_mDelay(500);
}
}
{
*/
for (uint32_t i=0; i<6; i++) {
for (uint32_t j=0; j<(1<<NBITS); j++) {
GPIOA->ODR ^= GPIO_ODR_6;
switch (i) {
case 0:
brightness[1] = brightness[5] = (1<<NBITS)-1;
brightness[2] = brightness[6] = 0;
brightness[3] = brightness[7] = j;
break;
case 1:
brightness[1] = brightness[5] = (1<<NBITS)-1-j;
brightness[2] = brightness[6] = 0;
brightness[3] = brightness[7] = (1<<NBITS)-1;
break;
case 2:
brightness[1] = brightness[5] = 0;
brightness[2] = brightness[6] = j;
brightness[3] = brightness[7] = (1<<NBITS)-1;
break;
case 3:
brightness[1] = brightness[5] = 0;
brightness[2] = brightness[6] = (1<<NBITS)-1;
brightness[3] = brightness[7] = (1<<NBITS)-1-j;
break;
case 4:
brightness[1] = brightness[5] = j;
brightness[2] = brightness[6] = (1<<NBITS)-1;
brightness[3] = brightness[7] = 0;
break;
case 5:
brightness[1] = brightness[5] = (1<<NBITS)-1;
brightness[2] = brightness[6] = (1<<NBITS)-1-j;
brightness[3] = brightness[7] = 0;
break;
}
do_transpose();
LL_mDelay(1);
}
}
}
}
uint32_t brightness[8] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
volatile uint8_t brightness_by_bit[NBITS] = { 0 };
void do_transpose(void) {
for (uint32_t i=0; i<NBITS; i++) {
uint8_t bv = 0;
uint32_t mask = 1<<i;
for (uint32_t j=0; j<8; j++) {
if (brightness[j] & mask)
bv |= 1<<j;
}
brightness_by_bit[i] = bv;
}
}
/*
* 460ns
* 720ns
*/
/*
* 1.00us
* 1.64us
* 2.84us
* 5.36us
* 10.4us
* 20.4us
* 40.4us
* 80.8us
*/
void TIM1_BRK_UP_TRG_COM_IRQHandler(void) {
static uint32_t idx = 0;
idx++;
if (idx >= NBITS)
idx = 0;
GPIOA->ODR ^= GPIO_ODR_4;
TIM1->CCMR1 = (4<<TIM_CCMR1_OC2M_Pos); // | TIM_CCMR1_OC2PE;
SPI1->DR = brightness_by_bit[idx]<<8;
while (SPI1->SR & SPI_SR_BSY);
const uint32_t period_base = 4; /* 1us */
const uint32_t period = period_base<<idx;
// TIM1->BDTR = TIM_BDTR_MOE | (16<<TIM_BDTR_DTG_Pos);
TIM1->BDTR = TIM_BDTR_MOE | (0<<TIM_BDTR_DTG_Pos);
TIM1->CCR3 = period-1;
TIM1->CNT = period-1;
TIM1->ARR = period;
TIM1->CCMR1 = (6<<TIM_CCMR1_OC2M_Pos); // | TIM_CCMR1_OC2PE;
TIM1->EGR |= TIM_EGR_UG;
TIM1->ARR = 2;
TIM1->CR1 |= TIM_CR1_CEN;
TIM1->SR &= ~TIM_SR_UIF_Msk;
}
void NMI_Handler(void) {
}
void HardFault_Handler(void) {
for(;;);
}
void SVC_Handler(void) {
}
void PendSV_Handler(void) {
}
void SysTick_Handler(void) {
}
|
