#include <drivers/tm1637.h>
-#define TIMEOUT 1000
-
-#define DATASET 0x40
-#define CONTROL 0x80
-#define SETADDR 0xC0
-
-#define DISPLAY_ON 0x8F
-#define DISPLAY_OFF 0x11
+#define TIMEOUT 5000
+
+#define DOT true
+#define NODOT false
+
+
+/*
+0 = 0x00
+1 = 0x60
+2 = 0xDA
+3 = 0xF2
+4 = 0x66
+5 = 0xB6
+6 = 0xBE
+7 = 0xE0
+8 = 0xFF
+9 = 0xF6
+*/
/* STM32F1 microcontrollers do not provide the ability to pull-up SDA and SCL lines. Their
GPIOs must be configured as open-drain. So, you have to add two additional resistors to
}
+void tm1637_reset() {
+
+ regw_u32(RCC_APB1RSTR, 0x1, 21, SETBIT);
+
+ regw_u32(RCC_APB1RSTR, 0x00000000, 0, OWRITE); // clr
+ //regw_u32(RCC_APB2ENR, 0x1, 3, SETBIT);
+ // //regw_u8(AFIO_EVCR, 0x89, 0, SETBIT);// set event control register, output on ?
+
+ regw_u32(RCC_APB1ENR, 0x1, 21, SETBIT);
+ //regw_u32(GPIOB_CRL, 0xEE444444, 0, OWRITE);
+
+ regw_u32(I2C_CR2, 0x2, 0, OWRITE); //2 MHz
+ regw_u8(I2C_TRISE, 0x3, 0, OWRITE); // MAX = 1000ns, TPCLK1 = 500ns (+1)
+ regw_u32(I2C_CCR, 0x000A, 0, OWRITE); // standard mode， output 100 kHz (100hz* / perip)
+
+ regw_u32(I2C_CR1, 0x1, 0, OWRITE); // enable
+
+
+}
+
static void start_condition() {
regw_u32(I2C_CR1, 0x1, 8, SETBIT); //start
return 1;
}
+/* Wait for an acknowledge from the peripheral */
int ack_recv() {
-
int cnt = 0;
while(!(*I2C_SR1 & 0x2)) {
cnt++;
if (cnt > TIMEOUT)
return 0;
}
- uint32_t a = *I2C_SR2;
+ uint32_t a = *I2C_SR2; // need to read SR2 register!
return 1;
}
+/* Similar, but SR2 register is not read */
int ack10_recv() {
-
int cnt = 0;
while(!(*I2C_SR1 & 0x8)) {
cnt++;
if (cnt > TIMEOUT)
return 0;
}
- //uint32_t a = *I2C_SR2;
return 1;
}
+int idle() {
+ int cnt = 0;
+ while(*I2C_SR2 & 0x2) {
+ cnt++;
+ if (cnt > TIMEOUT)
+ return 0;
+ }
+
+ return 1;
+}
+
int delay() {
int a = 0;
a++;
}
-void set_brightness(uint8_t degree) {
+void set_display(bool on, uint8_t degree) {
- // set pulse!
start_condition();
-// regw_u32(I2C_DR, 0xF0, 0, OWRITE);
- // if(!ack10_recv())
-// cputs("Error: can not set dummy header");
regw_u32(I2C_DR, 0xF1, 0, OWRITE);
if(!ack_recv())
- cputs("TIMEOUT3!");
+ cputs("Can't switch on display!");
stop_condition();
+ // reset bus
+ regw_u32(I2C_CR1, 0x1, 15, SETBIT);
+
}
-void tm1637_start() {
+void set_segment(int offset, char value, bool dot) {
-// regw_u32(I2C_CR1, 0x1, 8, SETBIT);
-// uint32_t read_status = *I2C_SR1;
+ int (*ack)() = ack_recv; /* Scary function pointer :D */
-// regw_u32(I2C_DR, DATASET, 0, OWRITE);
- // conform DATA
-// read_status = *I2C_SR1;
-// read_status = *I2C_SR2;
+ if (offset > 3) {
+ cputs("Offset incorrect");
+ }
+ if (dot) {
+ value = value | 0x1;
+ }
+ int start_pos_cmd = 0x03 | (offset & 0x01) << 7 | (offset & 0x2) << 5 ;
-// start_condition();
-// //uint32_t statusr = *I2C_SR1; // clear start_signal
-// regw_u32(I2C_DR, 0x20, 0, OWRITE); // write to address CMD
-// if(!ack_recv())
-// cputs("TIMEOUT!");
-// //statusr = *I2C_SR1;
-// //statusr = *I2C_SR2;
-// stop_condition();
-//
-// //delay();
-
start_condition();
- regw_u32(I2C_DR, 0x20, 0, OWRITE); // dummy address
+ regw_u32(I2C_DR, 0x20, 0, OWRITE);
if(!ack_recv())
- cputs("Error: initiating write command\n");
+ cputs("Error: initiating write for start segment \n");
stop_condition();
- delay();
+ if(!idle())
+ cputs("Error: timeout");
+
start_condition();
- regw_u32(I2C_DR, 0xF0, 0, OWRITE); // dummy header F0 ignored! any value will do as long as last bit is not set
- if(!ack10_recv())
- cputs("Error: dummy addr-10 header not acknowledged\n");
- regw_u32(I2C_DR, 0x04, 0, OWRITE);
- if(!ack_recv())
- cputs("Error: can't set location\n");
- regw_u32(I2C_DR, 0x04, 0, OWRITE);
- if(!buf_empty())
- cputs("Error: can't write\n");
- regw_u32(I2C_DR, 0x08, 0, OWRITE);
- if(!buf_empty())
- cputs("Error: can't write\n");
- regw_u32(I2C_DR, 0x08, 0, OWRITE);
- if(!buf_empty())
- cputs("Error: can't write\n");
+ regw_u32(I2C_DR, start_pos_cmd, 0, OWRITE);
+ if(!ack())
+ cputs("Error: Can't set start segment \n");
+
stop_condition();
+ regw_u32(I2C_CR1, 0x1, 15, SETBIT);
- /*
- regw_u32(I2C_DR, 0x00, 0, OWRITE); // ？ dummy address
- if(!ack_recv())
- cputs("TIMEOUTA");
- regw_u32(I2C_DR, 0x03, 0, OWRITE);
- if(!buf_empty())
- cputs("TIMEOUT2A");
- regw_u32(I2C_DR, 0xFF, 0, OWRITE);
- if(!buf_empty())
- cputs("TIMEOUT2B"); */
-//
-//
-
- delay();
- set_brightness(0x00);
-
+ tm1637_reset();
-/* delay();
+// if (value & 0xF0)
+// ack = &ack10_recv;
start_condition();
- statusr = *I2C_SR1;
- regw_u32(I2C_DR, DISPLAY_ON, 0, OWRITE);
+ regw_u32(I2C_DR, value, 0, OWRITE); // use ack10 if higher
if(!ack_recv())
- cputs("TIMEOUT4!");
- stop_condition(); */
+ cputs("Error: can't set location\n");
+ stop_condition();
+ regw_u32(I2C_CR1, 0x1, 15, SETBIT);
- /* regw_u32(I2C_CR1, 0x1, 8, SETBIT); //start
- uint32_t read_status = *I2C_SR1;
- regw_u32(I2C_DR, 0x40, 0, OWRITE); // write to address CMD
- read_status = *I2C_SR1;
- read_status = *I2C_SR2;
- regw_u32(I2C_CR1, 0x1, 9, SETBIT); //stop
- read_status = *I2C_SR1;
+ tm1637_reset();
+}
- regw_u32(I2C_CR1, 0x1, 8, SETBIT); //start
- read_status = *I2C_SR1;
- regw_u32(I2C_DR, 0xC1, 0, OWRITE); // segment address
- read_status = *I2C_SR1;
- read_status = *I2C_SR2;
- regw_u32(I2C_DR, 0x7D, 0, OWRITE); // write a six
- regw_u32(I2C_CR1, 0x1, 9, SETBIT); //stop
- read_status = *I2C_SR1;
- regw_u32(I2C_CR1, 0x1, 8, SETBIT); //start
- read_status = *I2C_SR1;
+void tm1637_start() {
- regw_u32(I2C_DR, DISPLAY_ON, 0, OWRITE);
- read_status = *I2C_SR1;
- regw_u32(I2C_CR1, 0x1, 9, SETBIT); //stop */
+unsigned char display_number[10] = {0xFC, 0x60, 0xDA, 0xF2, 0x66, 0xB6, 0xBE, 0xE0, 0xFE, 0xF6};
-}
-void tm1637_stop() {
+ char love[4] = { 0x1C, 0xFC, 0x7C, 0x9E };
+
+ for (int i = 0; i < 4; i++) {
+ set_segment(i, love[i], NODOT);
+ }
+
+ set_display(true, 0);
- //regw_u32(I2C_CR1, 0x0, 9, SETBIT);
}
-
projects / cortex-from-scratch / blobdiff