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Diffstat (limited to 'fw/fe310/eos/soc/i2c.c')
-rw-r--r--fw/fe310/eos/soc/i2c.c151
1 files changed, 151 insertions, 0 deletions
diff --git a/fw/fe310/eos/soc/i2c.c b/fw/fe310/eos/soc/i2c.c
new file mode 100644
index 0000000..553a9bf
--- /dev/null
+++ b/fw/fe310/eos/soc/i2c.c
@@ -0,0 +1,151 @@
+#include <stdlib.h>
+#include <stdint.h>
+
+#include "encoding.h"
+#include "platform.h"
+#include "prci_driver.h"
+
+#include "eos.h"
+#include "i2s.h"
+#include "i2c.h"
+
+int eos_i2c_init(uint8_t wakeup_cause) {
+ eos_i2c_speed(EOS_I2C_SPEED);
+ eos_i2c_enable();
+
+ return EOS_OK;
+}
+
+void eos_i2c_enable(void) {
+ I2C0_REGB(I2C_CONTROL) |= I2C_CONTROL_EN;
+
+ GPIO_REG(GPIO_IOF_SEL) &= ~IOF0_I2C0_MASK;
+ GPIO_REG(GPIO_IOF_EN) |= IOF0_I2C0_MASK;
+}
+
+void eos_i2c_disable(void) {
+ GPIO_REG(GPIO_IOF_EN) &= ~IOF0_I2C0_MASK;
+
+ I2C0_REGB(I2C_CONTROL) &= ~I2C_CONTROL_EN;
+}
+
+int eos_i2c_enabled(void) {
+ return !!(GPIO_REG(GPIO_IOF_EN) & IOF0_I2C0_MASK);
+}
+
+void eos_i2c_speed(uint32_t baud_rate) {
+ unsigned long clock_rate = PRCI_get_cpu_freq();
+ uint16_t prescaler = (clock_rate / (baud_rate * 5)) - 1;
+
+ I2C0_REGB(I2C_PRESCALE_LOW) = prescaler & 0xFF;
+ I2C0_REGB(I2C_PRESCALE_HIGH) = (prescaler >> 8) & 0xFF;
+}
+
+
+static int i2c_read(uint8_t cmd) {
+ I2C0_REGB(I2C_COMMAND) = I2C_CMD_READ | cmd;
+ while (I2C0_REGB(I2C_STATUS) & I2C_STATUS_TIP);
+
+ return I2C0_REGB(I2C_RECEIVE);
+}
+
+static int i2c_write(uint8_t cmd, uint8_t b) {
+ I2C0_REGB(I2C_TRANSMIT) = b;
+ I2C0_REGB(I2C_COMMAND) = I2C_CMD_WRITE | cmd;
+ while (I2C0_REGB(I2C_STATUS) & I2C_STATUS_TIP);
+
+ if (I2C0_REGB(I2C_STATUS) & I2C_STATUS_RXACK) return EOS_ERR;
+ return EOS_OK;
+}
+
+static int i2c_addr(uint8_t addr, uint8_t rw_flag) {
+ return i2c_write(I2C_CMD_START, ((addr & 0x7F) << 1) | (rw_flag & 0x1));
+}
+
+int eos_i2c_read8(uint8_t addr, uint8_t reg, uint8_t *buffer, uint16_t len) {
+ int rv;
+ int i;
+
+ rv = i2c_addr(addr, I2C_WRITE);
+ if (rv) return rv;
+
+ rv = i2c_write(0, reg);
+ if (rv) return rv;
+
+ rv = i2c_addr(addr, I2C_READ);
+ if (rv) return rv;
+
+ for (i=0; i<len; i++) {
+ rv = i2c_read(i == (len - 1) ? (I2C_CMD_ACK | I2C_CMD_STOP) : 0); /* Set NACK to end read, and generate STOP condition */
+ if (rv < 0) return rv;
+
+ buffer[i] = (uint8_t)rv;
+ }
+
+ return EOS_OK;
+}
+
+int eos_i2c_read16(uint8_t addr, uint16_t reg, uint8_t *buffer, uint16_t len) {
+ int rv;
+ int i;
+
+ rv = i2c_addr(addr, I2C_WRITE);
+ if (rv) return rv;
+
+ rv = i2c_write(0, reg >> 8);
+ if (rv) return rv;
+
+ rv = i2c_write(0, reg & 0xff);
+ if (rv) return rv;
+
+ rv = i2c_addr(addr, I2C_READ);
+ if (rv) return rv;
+
+ for (i=0; i<len; i++) {
+ rv = i2c_read(i == (len - 1) ? (I2C_CMD_ACK | I2C_CMD_STOP) : 0); /* Set NACK to end read, and generate STOP condition */
+ if (rv < 0) return rv;
+
+ buffer[i] = (uint8_t)rv;
+ }
+
+ return EOS_OK;
+}
+
+int eos_i2c_write8(uint8_t addr, uint8_t reg, uint8_t *buffer, uint16_t len) {
+ int rv;
+ int i;
+
+ rv = i2c_addr(addr, I2C_WRITE);
+ if (rv) return rv;
+
+ rv = i2c_write(0, reg);
+ if (rv) return rv;
+
+ for (i=0; i<len; i++) {
+ rv = i2c_write(i == (len - 1) ? I2C_CMD_STOP : 0, buffer[i]);
+ if (rv) return rv;
+ }
+
+ return EOS_OK;
+}
+
+int eos_i2c_write16(uint8_t addr, uint16_t reg, uint8_t *buffer, uint16_t len) {
+ int rv;
+ int i;
+
+ rv = i2c_addr(addr, I2C_WRITE);
+ if (rv) return rv;
+
+ rv = i2c_write(0, reg >> 8);
+ if (rv) return rv;
+
+ rv = i2c_write(0, reg & 0xff);
+ if (rv) return rv;
+
+ for (i=0; i<len; i++) {
+ rv = i2c_write(i == (len - 1) ? I2C_CMD_STOP : 0, buffer[i]);
+ if (rv) return rv;
+ }
+
+ return EOS_OK;
+}