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- /*
- * (c) danielinux 2019
- * GPLv.2
- *
- * See LICENSE for details
- */
- #include <stdint.h>
- #include <stdlib.h>
- #include "system.h"
- #include "i2c.h"
- #include "display.h"
- #define DISPLAY_I2C_ADDR 0x3C
- #define I2C1 (0x40005400)
- #define APB1_SPEED_IN_MHZ (42)
- #define I2C1_CR1 (*(volatile uint32_t *)(I2C1))
- #define I2C1_CR2 (*(volatile uint32_t *)(I2C1 + 0x04))
- #define I2C1_OAR1 (*(volatile uint32_t *)(I2C1 + 0x08))
- #define I2C1_OAR2 (*(volatile uint32_t *)(I2C1 + 0x0c))
- #define I2C1_DR (*(volatile uint32_t *)(I2C1 + 0x10))
- #define I2C1_SR1 (*(volatile uint32_t *)(I2C1 + 0x14))
- #define I2C1_SR2 (*(volatile uint32_t *)(I2C1 + 0x18))
- #define I2C1_CCR (*(volatile uint32_t *)(I2C1 + 0x1c))
- #define I2C1_TRISE (*(volatile uint32_t *)(I2C1 + 0x20))
- #define I2C_CR1_ENABLE (1 << 0)
- #define I2C_CR1_START (1 << 8)
- #define I2C_CR1_STOP (1 << 9)
- #define I2C_CR1_ACK (1 << 10)
- #define I2C_CR2_FREQ_MASK (0x3ff)
- #define I2C_CCR_MASK (0xfff)
- #define I2C_TRISE_MASK (0x3f)
- #define I2C_SR1_START (1 << 0)
- #define I2C_SR1_TX_BTF (1 << 2)
- #define I2C_SR1_ADDR_SENT (1 << 1)
- #define I2C_SR1_RX_NOTEMPTY (1 << 6)
- #define I2C_SR1_TX_EMPTY (1 << 7)
- #define I2C_SR2_MASTER (1 << 0)
- #define I2C_SR2_BUSY (1 << 1)
- #define I2C_SR2_XMIT (1 << 2)
- #define APB1_CLOCK_ER (*(volatile uint32_t *)(0x40023840))
- #define APB1_CLOCK_RST (*(volatile uint32_t *)(0x40023820))
- #define I2C1_APB1_CLOCK_ER_VAL (1 << 21)
- static void i2c1_pins_setup(void)
- {
- uint32_t reg;
- AHB1_CLOCK_ER |= GPIOB_AHB1_CLOCK_ER;
- /* Set mode = AF */
- reg = GPIOB_MODE & ~ (0x03 << (I2C1_SCL * 2));
- GPIOB_MODE = reg | (2 << (I2C1_SCL * 2));
- reg = GPIOB_MODE & ~ (0x03 << (I2C1_SDA * 2));
- GPIOB_MODE = reg | (2 << (I2C1_SDA * 2));
- /* Alternate function: */
- reg = GPIOB_AFH & ~(0xf << ((I2C1_SCL - 8) * 4));
- GPIOB_AFH = reg | (I2C1_PIN_AF << ((I2C1_SCL - 8) * 4));
- reg = GPIOB_AFH & ~(0xf << ((I2C1_SDA - 8) * 4));
- GPIOB_AFH = reg | (I2C1_PIN_AF << ((I2C1_SDA - 8) * 4));
- }
- static void i2c1_reset(void)
- {
- APB1_CLOCK_RST |= I2C1_APB1_CLOCK_ER_VAL;
- APB1_CLOCK_RST &= ~I2C1_APB1_CLOCK_ER_VAL;
- }
- static void i2c1_send_start(void)
- {
- volatile uint32_t sr1;
- I2C1_CR1 |= I2C_CR1_START;
- do {
- sr1 = I2C1_SR1;
- } while ((sr1 & I2C_SR1_START) == 0);;
- }
- static void i2c1_send_stop(void)
- {
- I2C1_CR1 |= I2C_CR1_STOP;
- }
- void display_send_data(void *priv, const uint8_t *buf, int len)
- {
- volatile uint32_t sr1, sr2;
- int i;
- volatile uint8_t drval;
- uint32_t start_data = 0x00000040;
- uint8_t address = DISPLAY_I2C_ADDR;
- I2C1_CR1 &= ~I2C_CR1_ENABLE;
- I2C1_CR1 &= ~I2C_CR1_STOP;
- I2C1_CR1 &= ~I2C_CR1_ACK;
- I2C1_CR1 |= I2C_CR1_ENABLE;
- /* Wait if the bus is busy */
- do {
- sr2 = I2C1_SR2;
- } while ((sr2 & I2C_SR2_BUSY) != 0);;
-
-
- /* Send a start condition */
- i2c1_send_start();
- /* Send address + R/W = 0 */
- I2C1_DR = (address << 1);
- do {
- sr1 = I2C1_SR1;
- } while ((sr1 & I2C_SR1_ADDR_SENT) != I2C_SR1_ADDR_SENT);
- do {
- sr2 = I2C1_SR2;
- } while ((sr2 & (I2C_SR2_BUSY | I2C_SR2_MASTER)) != (I2C_SR2_BUSY | I2C_SR2_MASTER));;
- I2C1_DR = start_data;
- do {
- sr1 = I2C1_SR1;
- } while ((sr1 & (I2C_SR1_TX_EMPTY)) == 0);
- for (i = 0; i < len; i++) {
- I2C1_DR = buf[i];
- do {
- sr1 = I2C1_SR1;
- if ((sr1 & I2C_SR1_RX_NOTEMPTY) == I2C_SR1_RX_NOTEMPTY) {
- drval = I2C1_DR;
- }
- } while ((sr1 & (I2C_SR1_TX_EMPTY)) == 0);
- }
- while ((sr1 & (I2C_SR1_TX_BTF)) == 0) {
- sr1 = I2C1_SR1;
- }
- i2c1_send_stop();
- }
- int i2c1_send(uint8_t address, const uint8_t *buf, int len)
- {
- volatile uint32_t sr1, sr2;
- int i;
- volatile uint8_t drval;
- I2C1_CR1 &= ~I2C_CR1_ENABLE;
- I2C1_CR1 &= ~I2C_CR1_STOP;
- I2C1_CR1 &= ~I2C_CR1_ACK;
- I2C1_CR1 |= I2C_CR1_ENABLE;
- /* Wait if the bus is busy */
- do {
- sr2 = I2C1_SR2;
- } while ((sr2 & I2C_SR2_BUSY) != 0);;
-
-
- /* Send a start condition */
- i2c1_send_start();
- /* Send address + R/W = 0 */
- I2C1_DR = (address << 1);
- do {
- sr1 = I2C1_SR1;
- } while ((sr1 & I2C_SR1_ADDR_SENT) != I2C_SR1_ADDR_SENT);
- do {
- sr2 = I2C1_SR2;
- } while ((sr2 & (I2C_SR2_BUSY | I2C_SR2_MASTER)) != (I2C_SR2_BUSY | I2C_SR2_MASTER));;
- for (i = 0; i < len; i++) {
- I2C1_DR = buf[i];
- do {
- sr1 = I2C1_SR1;
- if ((sr1 & I2C_SR1_RX_NOTEMPTY) == I2C_SR1_RX_NOTEMPTY) {
- drval = I2C1_DR;
- }
- } while ((sr1 & (I2C_SR1_TX_EMPTY)) == 0);
- }
- while ((sr1 & (I2C_SR1_TX_BTF)) == 0) {
- sr1 = I2C1_SR1;
- }
- i2c1_send_stop();
- return i;
- }
- void i2c1_setup(void)
- {
- uint32_t reg;
- i2c1_pins_setup();
- APB1_CLOCK_ER |= I2C1_APB1_CLOCK_ER_VAL;
- I2C1_CR1 &= ~I2C_CR1_ENABLE;
- i2c1_reset();
- reg = I2C1_CR2 & ~(I2C_CR2_FREQ_MASK);
- I2C1_CR2 = reg | APB1_SPEED_IN_MHZ;
- reg = I2C1_CCR & ~(I2C_CCR_MASK);
- // I2C1_CCR = reg | (APB1_SPEED_IN_MHZ * 5);
- I2C1_CCR = reg | 35;
-
- reg = I2C1_TRISE & ~(I2C_TRISE_MASK);
- I2C1_TRISE = reg | (APB1_SPEED_IN_MHZ + 1);
- I2C1_CR1 |= I2C_CR1_ENABLE;
- }
- void i2c_display_init(void)
- {
- i2c1_setup();
- display_init(NULL);
- }
- void display_send_cmd(void *priv, uint8_t cmd)
- {
- uint8_t buf[2] = {0x00, cmd};
- volatile int j;
- i2c1_send(DISPLAY_I2C_ADDR, buf, 2);
- }
- void display_send_cmd1(void *priv, uint8_t cmd, uint8_t arg1)
- {
- uint8_t buf[3] = {0x00, cmd, arg1};
- volatile int j;
- i2c1_send(DISPLAY_I2C_ADDR, buf, 3);
- }
- void display_send_cmd2(void *priv, uint8_t cmd, uint8_t arg1, uint8_t arg2)
- {
- uint8_t buf[4] = {0x00, cmd, arg1, arg2};
- volatile int j;
- i2c1_send(DISPLAY_I2C_ADDR, buf, 3);
- }
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