From: Robin Krens <robin@robinkrens.nl>
Date: Mon, 12 Aug 2019 20:53:23 +0000 (+0800)
Subject: Basic functionality for TM1637
X-Git-Url: https://robinkrens.nl/gitweb/?a=commitdiff_plain;h=a77bbcae4d5667f3b9a15a7e6e66417c3da93bfd;p=cortex-from-scratch
Basic functionality for TM1637
Note: this chip is big-endian.
Note2: Similar to I2C, but with no addressing phase. Hacked with dummy
comments
---
diff --git a/drivers/tm1637.c b/drivers/tm1637.c
index 517e0cf..7650ee3 100644
--- a/drivers/tm1637.c
+++ b/drivers/tm1637.c
@@ -42,6 +42,8 @@ GPIOs must be configured as open-drain. So, you have to add two additional resis
pull-up I2C lines. Something between 4K and 10K is a proven value.
*/
+/* BIG ENDIAN! */
+
void tm1637_init() {
/* Program the peripheral input clock in I2C_CR2 Register in order to generate correct timings
@@ -76,15 +78,39 @@ static void stop_condition() {
regw_u32(I2C_CR1, 0x1, 9, SETBIT); //stop
}
+static int buf_empty() {
+ int cnt = 0;
+ while(!(*I2C_SR1 & 0x80)) {
+ cnt++;
+ if (cnt > TIMEOUT) {
+ return 0;
+ }
+ }
+ return 1;
+}
+
int ack_recv() {
int cnt = 0;
- while(!(*I2C_SR1 & 0x1)) {
+ while(!(*I2C_SR1 & 0x2)) {
cnt++;
if (cnt > TIMEOUT)
return 0;
}
+ uint32_t a = *I2C_SR2;
+ return 1;
+}
+
+int ack10_recv() {
+
+ int cnt = 0;
+ while(!(*I2C_SR1 & 0x8)) {
+ cnt++;
+ if (cnt > TIMEOUT)
+ return 0;
+ }
+ //uint32_t a = *I2C_SR2;
return 1;
}
@@ -96,6 +122,22 @@ int delay() {
a++;
}
+void set_brightness(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!");
+ stop_condition();
+
+}
+
+
void tm1637_start() {
// regw_u32(I2C_CR1, 0x1, 8, SETBIT);
@@ -106,39 +148,71 @@ void tm1637_start() {
// read_status = *I2C_SR1;
// read_status = *I2C_SR2;
- uint32_t statusr;
+
+// 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();
- //uint32_t statusr = *I2C_SR1; // clear start_signal
- regw_u32(I2C_DR, 0x40, 0, OWRITE); // write to address CMD
+ regw_u32(I2C_DR, 0x20, 0, OWRITE); // dummy address
if(!ack_recv())
- cputs("TIMEOUT!");
- //statusr = *I2C_SR1;
- //statusr = *I2C_SR2;
- stop_condition();
+ cputs("Error: initiating write command\n");
- //delay();
+ stop_condition();
+
+ delay();
start_condition();
- //statusr = *I2C_SR1; // clear start_signal
- regw_u32(I2C_DR, 0xC1, 0, OWRITE);
+ 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("TIMEOUT2!");
- //statusr = *I2C_SR1;
- //statusr = *I2C_SR2;
- regw_u32(I2C_DR, 0x7D, 0, OWRITE);
- if(!ack_recv())
- cputs("TIMEOUT3!");
+ 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");
stop_condition();
+ /*
+ regw_u32(I2C_DR, 0x00, 0, OWRITE); // ï¼ 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);
+
+
+/* delay();
start_condition();
statusr = *I2C_SR1;
regw_u32(I2C_DR, DISPLAY_ON, 0, OWRITE);
if(!ack_recv())
cputs("TIMEOUT4!");
- stop_condition();
+ stop_condition(); */
/* regw_u32(I2C_CR1, 0x1, 8, SETBIT); //start